-#------------------------------------------------------------------------------
-#*
-#* Copyright 2006 - 2007, Intel Corporation
-#* All rights reserved. This program and the accompanying materials
-#* are licensed and made available under the terms and conditions of the BSD License
-#* which accompanies this distribution. The full text of the license may be found at
-#* http://opensource.org/licenses/bsd-license.php
-#*
-#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
-#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
-#*
-#* Mbr.asm
-#*
-#* Abstract:
-#*
-#------------------------------------------------------------------------------
-
-.equ BLOCK_SIZE, 0x0200
-.equ BLOCK_MASK, 0x01ff
-.equ BLOCK_SHIFT, 9
-
-# ****************************************************************************
-# Code loaded by BIOS at 0x0000:0x7C00
-# ****************************************************************************
-
-.org 0x0
-
+#------------------------------------------------------------------------------\r
+#*\r
+#* Copyright 2006 - 2007, Intel Corporation \r
+#* All rights reserved. This program and the accompanying materials\r
+#* are licensed and made available under the terms and conditions of the BSD License\r
+#* which accompanies this distribution. The full text of the license may be found at\r
+#* http://opensource.org/licenses/bsd-license.php\r
+#*\r
+#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+#*\r
+#* Mbr.asm\r
+#*\r
+#* Abstract:\r
+#*\r
+#------------------------------------------------------------------------------\r
+\r
+.equ BLOCK_SIZE, 0x0200\r
+.equ BLOCK_MASK, 0x01ff\r
+.equ BLOCK_SHIFT, 9\r
+\r
+# ****************************************************************************\r
+# Code loaded by BIOS at 0x0000:0x7C00\r
+# ****************************************************************************\r
+\r
+.org 0x0\r
+\r
.global _start\r
-_start:
-
-# ****************************************************************************
-# Start Print
-# ****************************************************************************
-
- movw $0xb800, %ax
- movw %ax, %es
- movw $0x7c0, %ax
- movw %ax, %ds
- leaw %cs:StartString, %si
- movw $10, %cx
- movw $160, %di
- rep
- movsw
-
-# ****************************************************************************
-# Print over
-# ****************************************************************************
-
-# ****************************************************************************
-# Initialize segment registers and copy code at 0x0000:0x7c00 to 0x0000:0x0600
-# ****************************************************************************
- xorw %ax, %ax # AX = 0x0000
- movw $0x7c00, %bx # BX = 0x7C00
- movw $0x600, %bp # BP = 0x0600
- movw RelocatedStart, %si # SI = Offset(RelocatedStart)
- movw $0x200, %cx # CX = 0x0200
- subw %si, %cx # CS = 0x0200 - Offset(RelocatedStart)
- leaw (%bp,%si,), %di # DI = 0x0600 + Offset(RelocatedStart)
- leaw (%bx,%si,), %si # BX = 0x7C00 + Offset(RelocatedStart)
- movw %ax, %ss # SS = 0x0000
- movw %bx, %sp # SP = 0x7C00
- movw %ax, %es # ES = 0x0000
- movw %ax, %ds # DS = 0x0000
- pushw %ax # PUSH 0x0000
- pushw %di # PUSH 0x0600 + Offset(RelocatedStart)
- cld # Clear the direction flag
- rep
- movsb # Copy 0x0200 bytes from 0x7C00 to 0x0600
- retl # JMP 0x0000:0x0600 + Offset(RelocatedStart)
-
-# ****************************************************************************
-# Code relocated to 0x0000:0x0600
-# ****************************************************************************
-
-RelocatedStart:
-# ****************************************************************************
-# Get Driver Parameters to 0x0000:0x7BFC
-# ****************************************************************************
-
- xorw %ax, %ax # AX = 0
- movw %ax, %ss # SS = 0
- addw $0x1000, %ax
- movw %ax, %ds
-
- movw $0x7c00, %sp # SP = 0x7c00
- movw %sp, %bp # BP = 0x7c00
-
- movb $8, %ah # AH = 8 - Get Drive Parameters Function
- movb %dl, PhysicalDrive(%bp) # BBS defines that BIOS would pass the booting driver number to the loader through DL
- int $0x13 # Get Drive Parameters
- xorw %ax, %ax # AX = 0
- movb %dh, %al # AL = DH
- incb %al # MaxHead = AL + 1
- pushw %ax # 0000:7bfe = MaxHead
- movb %cl, %al # AL = CL
- andb $0x3f, %al # MaxSector = AL & 0x3f
- pushw %ax # 0000:7bfc = MaxSector
-
-# ****************************************************************************
-# Read Target DBR from hard disk to 0x0000:0x7C00
-# ****************************************************************************
-
- xorw %ax, %ax
- movb MbrPartitionIndicator(%bp), %al # AX = MbrPartitionIndex
- cmpb $0xff, %al # 0xFF means do legacy MBR boot
- jnz EfiDbr
-LegacyMbr:
- movl $0x0000600, %eax # Assume LegacyMBR is backuped in Sector 6
- jmp StartReadTo7C00 # EAX = Header/Sector/Tracker/Zero
-
-EfiDbr:
- cmpb $4, %al # MbrPartitionIndex should < 4
- jae BadDbr
- shlw $4, %ax # AX = MBREntrySize * Index
- addw $0x1be, %ax # AX = MBREntryOffset
- movw %ax, %di # DI = MBREntryOffset
-
- # Here we don't use the C/H/S information provided by Partition table
- # but calculate C/H/S from LBA ourselves
- # Ci: Cylinder number
- # Hi: Header number
- # Si: Sector number
- movl %es:8(%bp,%di,), %eax # Start LBA
- movl %eax, %edx
- shrl $16, %edx # DX:AX = Start LBA
- # = Ci * (H * S) + Hi * S + (Si - 1)
-
- # Calculate C/H/S according to LBA
- movw $0x7bfa, %bp
- divw 2(%bp) # AX = Hi + H*Ci
- # DX = Si - 1
- incw %dx # DX = Si
- pushw %dx # 0000:7bfa = Si <----
- xorw %dx, %dx # DX:AX = Hi + H*Ci
- divw 4(%bp) # AX = Ci <----
- # DX = Hi <----
-
-StartReadTo7C00:
-
- movb (%bp), %cl # Si
- movb %al, %ch # Ci[0-7]
- orb %ah, %cl # Ci[8,9]
- movw $0x7c00, %bx # ES:BX = 0000:7C00h
- movb $0x2, %ah # Function 02h
- movb $1, %al # 1 Sector
- movb %dl, %dh # Hi
- movw $0x600, %bp
- movb PhysicalDrive(%bp), %dl # Drive number
- int $0x13
- jc BadDbr
-
-
-
-# ****************************************************************************
-# Transfer control to BootSector - Jump to 0x0000:0x7C00
-# ****************************************************************************
- xorw %ax, %ax
- pushw %ax # PUSH 0x0000 - Segment
- movw $0x7c00, %di
- pushw %di # PUSH 0x7C00 - Offset
- retl # JMP 0x0000:0x7C00
-
-# ****************************************************************************
-# ERROR Condition:
-# ****************************************************************************
-
-BadDbr:
- pushw %ax
- movw $0xb800, %ax
- movw %ax, %es
- movw $0x60, %ax
- movw %ax, %ds
- leaw %cs:ErrorString, %si
- movw $320, %di
- popw %ax
- call A2C
- movb %ah, 16(%si)
- movb %al, 18(%si)
- movw $10, %cx
- rep
- movsw
-Halt:
- jmp Halt
-
-StartString:
-.byte 'M', 0x0c, 'B', 0x0c, 'R', 0x0c, ' ', 0x0c, 'S', 0x0c, 't', 0x0c, 'a', 0x0c, 'r', 0x0c, 't', 0x0c, '!', 0x0c
-ErrorString:
-.byte 'M', 0x0c, 'B', 0x0c, 'R', 0x0c, ' ', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, ':', 0x0c, '?', 0x0c, '?', 0x0c
-
-# ****************************************************************************
-# A2C - convert Ascii code stored in AH to character stored in AX
-# ****************************************************************************
-A2C:
- movb %ah, %al
- shrb $4, %ah
- andb $0xF, %al
- addb '0', %ah
- addb '0', %al
-
- cmpb '9', %ah
- jle A2C_L1
- addb $7, %ah
-A2C_L1:
-
- cmpb '9', %al
- jle A2C_L2
- addb $7, %al
-A2C_L2:
- ret
-
-
-# ****************************************************************************
-# PhysicalDrive - Used to indicate which disk to be boot
-# Can be patched by tool
-# ****************************************************************************
-.org 0x01B6
-PhysicalDrive: .byte 0x80
-
-# ****************************************************************************
-# MbrPartitionIndicator - Used to indicate which MBR partition to be boot
-# Can be patched by tool
-# OxFF means boot to legacy MBR. (LBA OFFSET 6)
-# ****************************************************************************
-.org 0x01B7
-MbrPartitionIndicator: .byte 0
-
-# ****************************************************************************
-# Unique MBR signature
-# ****************************************************************************
-.org 0x01B8
- .ascii "DUET"
-
-# ****************************************************************************
-# Unknown
-# ****************************************************************************
-.org 0x01BC
- .word 0
-
-# ****************************************************************************
-# MBR Entry - To be patched
-# ****************************************************************************
-.org 0x01BE
- .long 0,0,0,0
-.org 0x01CE
- .long 0,0,0,0
-.org 0x01DE
- .long 0,0,0,0
-.org 0x01EE
- .long 0,0,0,0
-
-# ****************************************************************************
-# Sector Signature
-# ****************************************************************************
-
-.org 0x01FE
-SectorSignature:
- .word 0xaa55 # Boot Sector Signature
-
-
-
+_start:\r
+\r
+# ****************************************************************************\r
+# Start Print\r
+# ****************************************************************************\r
+\r
+ movw $0xb800, %ax\r
+ movw %ax, %es\r
+ movw $0x7c0, %ax\r
+ movw %ax, %ds\r
+ leaw %cs:StartString, %si\r
+ movw $10, %cx\r
+ movw $160, %di\r
+ rep \r
+ movsw\r
+\r
+# ****************************************************************************\r
+# Print over\r
+# ****************************************************************************\r
+\r
+# ****************************************************************************\r
+# Initialize segment registers and copy code at 0x0000:0x7c00 to 0x0000:0x0600\r
+# ****************************************************************************\r
+ xorw %ax, %ax # AX = 0x0000\r
+ movw $0x7c00, %bx # BX = 0x7C00\r
+ movw $0x600, %bp # BP = 0x0600\r
+ movw RelocatedStart, %si # SI = Offset(RelocatedStart)\r
+ movw $0x200, %cx # CX = 0x0200\r
+ subw %si, %cx # CS = 0x0200 - Offset(RelocatedStart)\r
+ leaw (%bp,%si,), %di # DI = 0x0600 + Offset(RelocatedStart)\r
+ leaw (%bx,%si,), %si # BX = 0x7C00 + Offset(RelocatedStart)\r
+ movw %ax, %ss # SS = 0x0000\r
+ movw %bx, %sp # SP = 0x7C00\r
+ movw %ax, %es # ES = 0x0000\r
+ movw %ax, %ds # DS = 0x0000\r
+ pushw %ax # PUSH 0x0000\r
+ pushw %di # PUSH 0x0600 + Offset(RelocatedStart)\r
+ cld # Clear the direction flag\r
+ rep\r
+ movsb # Copy 0x0200 bytes from 0x7C00 to 0x0600\r
+ retl # JMP 0x0000:0x0600 + Offset(RelocatedStart)\r
+\r
+# ****************************************************************************\r
+# Code relocated to 0x0000:0x0600\r
+# ****************************************************************************\r
+\r
+RelocatedStart: \r
+# ****************************************************************************\r
+# Get Driver Parameters to 0x0000:0x7BFC\r
+# ****************************************************************************\r
+\r
+ xorw %ax, %ax # AX = 0\r
+ movw %ax, %ss # SS = 0\r
+ addw $0x1000, %ax\r
+ movw %ax, %ds\r
+\r
+ movw $0x7c00, %sp # SP = 0x7c00\r
+ movw %sp, %bp # BP = 0x7c00\r
+\r
+ movb $8, %ah # AH = 8 - Get Drive Parameters Function\r
+ movb %dl, PhysicalDrive(%bp) # BBS defines that BIOS would pass the booting driver number to the loader through DL\r
+ int $0x13 # Get Drive Parameters\r
+ xorw %ax, %ax # AX = 0\r
+ movb %dh, %al # AL = DH\r
+ incb %al # MaxHead = AL + 1\r
+ pushw %ax # 0000:7bfe = MaxHead\r
+ movb %cl, %al # AL = CL\r
+ andb $0x3f, %al # MaxSector = AL & 0x3f\r
+ pushw %ax # 0000:7bfc = MaxSector\r
+\r
+# ****************************************************************************\r
+# Read Target DBR from hard disk to 0x0000:0x7C00\r
+# ****************************************************************************\r
+\r
+ xorw %ax, %ax\r
+ movb MbrPartitionIndicator(%bp), %al # AX = MbrPartitionIndex\r
+ cmpb $0xff, %al # 0xFF means do legacy MBR boot\r
+ jnz EfiDbr\r
+LegacyMbr: \r
+ movl $0x0000600, %eax # Assume LegacyMBR is backuped in Sector 6\r
+ jmp StartReadTo7C00 # EAX = Header/Sector/Tracker/Zero\r
+\r
+EfiDbr: \r
+ cmpb $4, %al # MbrPartitionIndex should < 4\r
+ jae BadDbr\r
+ shlw $4, %ax # AX = MBREntrySize * Index\r
+ addw $0x1be, %ax # AX = MBREntryOffset\r
+ movw %ax, %di # DI = MBREntryOffset\r
+\r
+ # Here we don't use the C/H/S information provided by Partition table\r
+ # but calculate C/H/S from LBA ourselves\r
+ # Ci: Cylinder number\r
+ # Hi: Header number\r
+ # Si: Sector number\r
+ movl %es:8(%bp,%di,), %eax # Start LBA\r
+ movl %eax, %edx\r
+ shrl $16, %edx # DX:AX = Start LBA\r
+ # = Ci * (H * S) + Hi * S + (Si - 1)\r
+\r
+ # Calculate C/H/S according to LBA\r
+ movw $0x7bfa, %bp\r
+ divw 2(%bp) # AX = Hi + H*Ci\r
+ # DX = Si - 1\r
+ incw %dx # DX = Si\r
+ pushw %dx # 0000:7bfa = Si <----\r
+ xorw %dx, %dx # DX:AX = Hi + H*Ci\r
+ divw 4(%bp) # AX = Ci <----\r
+ # DX = Hi <----\r
+\r
+StartReadTo7C00: \r
+\r
+ movb (%bp), %cl # Si\r
+ movb %al, %ch # Ci[0-7]\r
+ orb %ah, %cl # Ci[8,9]\r
+ movw $0x7c00, %bx # ES:BX = 0000:7C00h\r
+ movb $0x2, %ah # Function 02h\r
+ movb $1, %al # 1 Sector\r
+ movb %dl, %dh # Hi\r
+ movw $0x600, %bp\r
+ movb PhysicalDrive(%bp), %dl # Drive number\r
+ int $0x13\r
+ jc BadDbr\r
+\r
+\r
+\r
+# ****************************************************************************\r
+# Transfer control to BootSector - Jump to 0x0000:0x7C00\r
+# ****************************************************************************\r
+ xorw %ax, %ax\r
+ pushw %ax # PUSH 0x0000 - Segment\r
+ movw $0x7c00, %di\r
+ pushw %di # PUSH 0x7C00 - Offset\r
+ retl # JMP 0x0000:0x7C00\r
+\r
+# ****************************************************************************\r
+# ERROR Condition:\r
+# ****************************************************************************\r
+\r
+BadDbr: \r
+ pushw %ax\r
+ movw $0xb800, %ax\r
+ movw %ax, %es\r
+ movw $0x60, %ax\r
+ movw %ax, %ds\r
+ leaw %cs:ErrorString, %si\r
+ movw $320, %di\r
+ popw %ax\r
+ call A2C\r
+ movb %ah, 16(%si)\r
+ movb %al, 18(%si)\r
+ movw $10, %cx\r
+ rep\r
+ movsw\r
+Halt: \r
+ jmp Halt\r
+\r
+StartString: \r
+.byte 'M', 0x0c, 'B', 0x0c, 'R', 0x0c, ' ', 0x0c, 'S', 0x0c, 't', 0x0c, 'a', 0x0c, 'r', 0x0c, 't', 0x0c, '!', 0x0c\r
+ErrorString: \r
+.byte 'M', 0x0c, 'B', 0x0c, 'R', 0x0c, ' ', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, ':', 0x0c, '?', 0x0c, '?', 0x0c\r
+\r
+# ****************************************************************************\r
+# A2C - convert Ascii code stored in AH to character stored in AX\r
+# ****************************************************************************\r
+A2C: \r
+ movb %ah, %al\r
+ shrb $4, %ah\r
+ andb $0xF, %al\r
+ addb '0', %ah\r
+ addb '0', %al\r
+\r
+ cmpb '9', %ah\r
+ jle A2C_L1\r
+ addb $7, %ah\r
+A2C_L1: \r
+\r
+ cmpb '9', %al\r
+ jle A2C_L2\r
+ addb $7, %al\r
+A2C_L2: \r
+ ret\r
+\r
+\r
+# ****************************************************************************\r
+# PhysicalDrive - Used to indicate which disk to be boot\r
+# Can be patched by tool\r
+# ****************************************************************************\r
+.org 0x01B6\r
+PhysicalDrive: .byte 0x80\r
+\r
+# ****************************************************************************\r
+# MbrPartitionIndicator - Used to indicate which MBR partition to be boot\r
+# Can be patched by tool\r
+# OxFF means boot to legacy MBR. (LBA OFFSET 6)\r
+# ****************************************************************************\r
+.org 0x01B7\r
+MbrPartitionIndicator: .byte 0\r
+\r
+# ****************************************************************************\r
+# Unique MBR signature\r
+# ****************************************************************************\r
+.org 0x01B8\r
+ .ascii "DUET"\r
+\r
+# ****************************************************************************\r
+# Unknown\r
+# ****************************************************************************\r
+.org 0x01BC\r
+ .word 0\r
+\r
+# ****************************************************************************\r
+# MBR Entry - To be patched\r
+# ****************************************************************************\r
+.org 0x01BE\r
+ .long 0,0,0,0\r
+.org 0x01CE\r
+ .long 0,0,0,0\r
+.org 0x01DE\r
+ .long 0,0,0,0\r
+.org 0x01EE\r
+ .long 0,0,0,0\r
+\r
+# ****************************************************************************\r
+# Sector Signature\r
+# ****************************************************************************\r
+\r
+.org 0x01FE\r
+SectorSignature: \r
+ .word 0xaa55 # Boot Sector Signature\r
+\r
+\r
+\r
# Now in 32-bit protected mode.\r
##############################################################################\r
\r
- .org 0x21000
-
-.global _start
-_start:
+ .org 0x21000\r
+\r
+.global _start\r
+_start:\r
\r
.equ DEFAULT_HANDLER_SIZE, INT1 - INT0\r
\r
-#------------------------------------------------------------------------------
-#*
-#* Copyright 2006, Intel Corporation
-#* All rights reserved. This program and the accompanying materials
-#* are licensed and made available under the terms and conditions of the BSD License
-#* which accompanies this distribution. The full text of the license may be found at
-#* http://opensource.org/licenses/bsd-license.php
-#*
-#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
-#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
-#*
-#* efi64.asm
-#*
-#* Abstract:
-#*
-#------------------------------------------------------------------------------
-
-##############################################################################
-# Now in 64-bit long mode.
-##############################################################################
-
- .486:
- .stack:
- .code:
- .org 0x21000
-
-.equ DEFAULT_HANDLER_SIZE, INT1 - INT0
-
-.macro jmpCommonIdtEntry
- # jmp commonIdtEntry - this must be hand coded to keep the assembler from
- # using a 8 bit reletive jump when the entries are
- # within 255 bytes of the common entry. This must
- # be done to maintain the consistency of the size
- # of entry points...
- .byte 0xe9 # jmp 16 bit relative
- .long commonIdtEntry - . - 4 # offset to jump to
-.endm
-
-
-Start:
-
- movl $0x001fffe8,%esp # make final stack aligned
-
- # set OSFXSR and OSXMMEXCPT because some code will use XMM register
- .byte 0xf
- .byte 0x20
- .byte 0xe0
-# mov rax, cr4
- btsl $9,%eax
- btsl $0xa,%eax
- .byte 0xf
- .byte 0x22
- .byte 0xe0
-# mov cr4, rax
-
- call ClearScreen
-
- # Populate IDT with meaningful offsets for exception handlers...
- sidt Idtr
-
-
- movl Halt, %eax
- movl %eax,%ebx # use bx to copy 15..0 to descriptors
- shrl $16,%eax # use ax to copy 31..16 to descriptors
- # 63..32 of descriptors is 0
- movl $0x78,%ecx # 78h IDT entries to initialize with unique entry points (exceptions)
- movl (Idtr + 2), %esi
- movl (%esi),%edi
-
-LOOP_1: # loop through all IDT entries exception handlers and initialize to default handler
+#------------------------------------------------------------------------------\r
+#*\r
+#* Copyright 2006, Intel Corporation \r
+#* All rights reserved. This program and the accompanying materials \r
+#* are licensed and made available under the terms and conditions of the BSD License \r
+#* which accompanies this distribution. The full text of the license may be found at \r
+#* http://opensource.org/licenses/bsd-license.php \r
+#* \r
+#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r
+#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r
+#* \r
+#* efi64.asm\r
+#* \r
+#* Abstract:\r
+#*\r
+#------------------------------------------------------------------------------\r
+\r
+##############################################################################\r
+# Now in 64-bit long mode.\r
+##############################################################################\r
+\r
+ .486: \r
+ .stack: \r
+ .code: \r
+ .org 0x21000\r
+\r
+.equ DEFAULT_HANDLER_SIZE, INT1 - INT0\r
+\r
+.macro jmpCommonIdtEntry \r
+ # jmp commonIdtEntry - this must be hand coded to keep the assembler from\r
+ # using a 8 bit reletive jump when the entries are\r
+ # within 255 bytes of the common entry. This must\r
+ # be done to maintain the consistency of the size\r
+ # of entry points...\r
+ .byte 0xe9 # jmp 16 bit relative\r
+ .long commonIdtEntry - . - 4 # offset to jump to\r
+.endm\r
+\r
+\r
+Start: \r
+\r
+ movl $0x001fffe8,%esp # make final stack aligned\r
+\r
+ # set OSFXSR and OSXMMEXCPT because some code will use XMM register\r
+ .byte 0xf\r
+ .byte 0x20\r
+ .byte 0xe0\r
+# mov rax, cr4\r
+ btsl $9,%eax\r
+ btsl $0xa,%eax\r
+ .byte 0xf\r
+ .byte 0x22\r
+ .byte 0xe0\r
+# mov cr4, rax\r
+\r
+ call ClearScreen\r
+\r
+ # Populate IDT with meaningful offsets for exception handlers...\r
+ sidt Idtr \r
+ \r
+\r
+ movl Halt, %eax\r
+ movl %eax,%ebx # use bx to copy 15..0 to descriptors\r
+ shrl $16,%eax # use ax to copy 31..16 to descriptors \r
+ # 63..32 of descriptors is 0\r
+ movl $0x78,%ecx # 78h IDT entries to initialize with unique entry points (exceptions)\r
+ movl (Idtr + 2), %esi\r
+ movl (%esi),%edi\r
+\r
+LOOP_1: # loop through all IDT entries exception handlers and initialize to default handler\r
movw %bx, (%edi) # write bits 15..0 of offset\r
movw $0x38, 2(%edi) # SYS_CODE_SEL64 from GDT\r
movw $(0x0e00 | 0x8000), 4(%edi) # type = 386 interrupt gate, present\r
- movw %ax, 6(%edi) # write bits 31..16 of offset
+ movw %ax, 6(%edi) # write bits 31..16 of offset\r
movl $0, 8(%edi) # write bits 31..16 of offset \r
addl $16, %edi # move up to next descriptor\r
addw DEFAULT_HANDLER_SIZE, %bx # move to next entry point\r
- loopl LOOP_1 # loop back through again until all descriptors are initialized
-
- ## at this point edi contains the offset of the descriptor for INT 20
- ## and bx contains the low 16 bits of the offset of the default handler
- ## so initialize all the rest of the descriptors with these two values...
-# mov ecx, 101 ; there are 100 descriptors left (INT 20 (14h) - INT 119 (77h)
-#@@: ; loop through all IDT entries exception handlers and initialize to default handler
-# mov word ptr [edi], bx ; write bits 15..0 of offset
-# mov word ptr [edi+2], 38h ; SYS_CODE64_SEL from GDT
-# mov word ptr [edi+4], 0e00h OR 8000h ; type = 386 interrupt gate, present
-# mov word ptr [edi+6], ax ; write bits 31..16 of offset
-# mov dword ptr [edi+8], 0 ; write bits 63..32 of offset
-# add edi, 16 ; move up to next descriptor
-# loop @b ; loop back through again until all descriptors are initialized
-
-
-## DUMP location of IDT and several of the descriptors
-# mov ecx, 8
-# mov eax, [offset Idtr + 2]
-# mov eax, [eax]
-# mov edi, 0b8000h
-# call PrintQword
-# mov esi, eax
-# mov edi, 0b80a0h
-# jmp OuterLoop
-
-##
-## just for fun, let's do a software interrupt to see if we correctly land in the exception handler...
-# mov eax, 011111111h
-# mov ebx, 022222222h
-# mov ecx, 033333333h
-# mov edx, 044444444h
-# mov ebp, 055555555h
-# mov esi, 066666666h
-# mov edi, 077777777h
-# push 011111111h
-# push 022222222h
-# push 033333333h
-# int 119
-
- movl $0x22000,%esi # esi = 22000
- movl 0x14(%esi),%eax # eax = [22014]
- addl %eax,%esi # esi = 22000 + [22014] = Base of EFILDR.C
- movl 0x3c(%esi),%ebp # ebp = [22000 + [22014] + 3c] = NT Image Header for EFILDR.C
- addl %esi,%ebp
- movl 0x30(%ebp),%edi # edi = [[22000 + [22014] + 3c] + 2c] = ImageBase (63..32 is zero, ignore)
- movl 0x28(%ebp),%eax # eax = [[22000 + [22014] + 3c] + 24] = EntryPoint
- addl %edi,%eax # eax = ImageBase + EntryPoint
- movl %ebx, EfiLdrOffset
- movl %eax, (%ebx) # Modify far jump instruction for correct entry point
-
- movw 6(%ebp), %bx # bx = Number of sections
- xorl %eax,%eax
- movw 0x14(%ebp), %ax # ax = Optional Header Size
- addl %eax,%ebp
- addl $0x18,%ebp # ebp = Start of 1st Section
-
-SectionLoop:
- pushl %esi # Save Base of EFILDR.C
- pushl %edi # Save ImageBase
- addl 0x14(%ebp),%esi # esi = Base of EFILDR.C + PointerToRawData
- addl 0x0c(%ebp),%edi # edi = ImageBase + VirtualAddress
- movl 0x10(%ebp),%ecx # ecs = SizeOfRawData
-
- cld
- shrl $2,%ecx
- rep
- movsl
-
- popl %edi # Restore ImageBase
- popl %esi # Restore Base of EFILDR.C
-
- addw $0x28,%bp # ebp = ebp + 028h = Pointer to next section record
- .byte 0x66
- .byte 0xff
- .byte 0xcb
-# dec bx
- cmpw $0,%bx
- jne SectionLoop
-
- movl (Idtr), %eax # get size of IDT
- movzx (%edx), %eax
- .byte 0xff
- .byte 0xc0
-# inc eax
- addl 2(%edx), %eax # add to base of IDT to get location of memory map...
- xorl %ecx,%ecx
- movl %eax,%ecx # put argument to RCX
-
- .byte 0x48
- .byte 0xc7
- .byte 0xc0
-EfiLdrOffset:
- .long 0x00401000 # Offset of EFILDR
-# mov rax, 401000h
- .byte 0x50
-# push rax
-
-# ret
- .byte 0xc3
-
-# db "**** DEFAULT IDT ENTRY ***",0
- .align 0x2
-Halt:
-INT0:
- pushl $0x0 # push error code place holder on the stack
- pushl $0x0
- jmpCommonIdtEntry
-# db 0e9h ; jmp 16 bit reletive
-# dd commonIdtEntry - $ - 4 ; offset to jump to
-
-INT1:
- pushl $0x0 # push error code place holder on the stack
- pushl $0x1
- jmpCommonIdtEntry
-
-INT2:
- pushl $0x0 # push error code place holder on the stack
- pushl $0x2
- jmpCommonIdtEntry
-
-INT3:
- pushl $0x0 # push error code place holder on the stack
- pushl $0x3
- jmpCommonIdtEntry
-
-INT4:
- pushl $0x0 # push error code place holder on the stack
- pushl $0x4
- jmpCommonIdtEntry
-
-INT5:
- pushl $0x0 # push error code place holder on the stack
- pushl $0x5
- jmpCommonIdtEntry
-
-INT6:
- pushl $0x0 # push error code place holder on the stack
- pushl $0x6
- jmpCommonIdtEntry
-
-INT7:
- pushl $0x0 # push error code place holder on the stack
- pushl $0x7
- jmpCommonIdtEntry
-
-INT8:
-# Double fault causes an error code to be pushed so no phony push necessary
- nop
- nop
- pushl $0x8
- jmpCommonIdtEntry
-
-INT9:
- pushl $0x0 # push error code place holder on the stack
- pushl $0x9
- jmpCommonIdtEntry
-
-INT10:
-# Invalid TSS causes an error code to be pushed so no phony push necessary
- nop
- nop
- pushl $10
- jmpCommonIdtEntry
-
-INT11:
-# Segment Not Present causes an error code to be pushed so no phony push necessary
- nop
- nop
- pushl $11
- jmpCommonIdtEntry
-
-INT12:
-# Stack fault causes an error code to be pushed so no phony push necessary
- nop
- nop
- pushl $12
- jmpCommonIdtEntry
-
-INT13:
-# GP fault causes an error code to be pushed so no phony push necessary
- nop
- nop
- pushl $13
- jmpCommonIdtEntry
-
-INT14:
-# Page fault causes an error code to be pushed so no phony push necessary
- nop
- nop
- pushl $14
- jmpCommonIdtEntry
-
-INT15:
- pushl $0x0 # push error code place holder on the stack
- pushl $15
- jmpCommonIdtEntry
-
-INT16:
- pushl $0x0 # push error code place holder on the stack
- pushl $16
- jmpCommonIdtEntry
-
-INT17:
-# Alignment check causes an error code to be pushed so no phony push necessary
- nop
- nop
- pushl $17
- jmpCommonIdtEntry
-
-INT18:
- pushl $0x0 # push error code place holder on the stack
- pushl $18
- jmpCommonIdtEntry
-
-INT19:
- pushl $0x0 # push error code place holder on the stack
- pushl $19
- jmpCommonIdtEntry
-
-INTUnknown:
-.rept (0x78 - 20)
- pushl $0x0 # push error code place holder on the stack
-# push xxh ; push vector number
- .byte 0x6a
- .byte ( . - INTUnknown - 3 ) / 9 + 20 # vector number
- jmpCommonIdtEntry
-.endr
-
-commonIdtEntry:
- pushl %eax
- pushl %ecx
- pushl %edx
- pushl %ebx
- pushl %esp
- pushl %ebp
- pushl %esi
- pushl %edi
- .byte 0x41
- .byte 0x50
-# push r8
- .byte 0x41
- .byte 0x51
-# push r9
- .byte 0x41
- .byte 0x52
-# push r10
- .byte 0x41
- .byte 0x53
-# push r11
- .byte 0x41
- .byte 0x54
-# push r12
- .byte 0x41
- .byte 0x55
-# push r13
- .byte 0x41
- .byte 0x56
-# push r14
- .byte 0x41
- .byte 0x57
-# push r15
- .byte 0x48
- movl %esp,%ebp
-# mov rbp, rsp
-
-##
-## At this point the stack looks like this:
-##
-## Calling SS
-## Calling RSP
-## rflags
-## Calling CS
-## Calling RIP
-## Error code or 0
-## Int num or 0ffh for unknown int num
-## rax
-## rcx
-## rdx
-## rbx
-## rsp
-## rbp
-## rsi
-## rdi
-## r8
-## r9
-## r10
-## r11
-## r12
-## r13
-## r14
-## r15 <------- RSP, RBP
-##
-
- call ClearScreen
- mov String1, %esi
- call PrintString
- .byte 0x48
- movl 16*8(%ebp),%eax ## move Int number into RAX
- .byte 0x48
- cmpl $18,%eax
- ja PrintDefaultString
-PrintExceptionString:
- shll $3,%eax ## multiply by 8 to get offset from StringTable to actual string address
- addl StringTable, %eax
- movl (%eax),%esi
- jmp PrintTheString
-PrintDefaultString:
- movl IntUnknownString, %esi
- # patch Int number
- movl %eax,%edx
- call A2C
- movb %al,1(%esi)
- movl %edx,%eax
- shrl $4,%eax
- call A2C
- movb %al,(%esi)
-PrintTheString:
- call PrintString
- movl String2, %esi
- call PrintString
- .byte 0x48
- movl 19*8(%ebp),%eax # CS
- call PrintQword
- movb $':', %al
- movb %al, (%edi)
- addl $2,%edi
- .byte 0x48
- movl 18*8(%ebp),%eax # RIP
- call PrintQword
- movl String3, %esi
- call PrintString
-
- movl $0xb8140,%edi
-
- movl StringRax, %esi
- call PrintString
- .byte 0x48
- movl 15*8(%ebp),%eax
- call PrintQword
-
- movl StringRcx, %esi
- call PrintString
- .byte 0x48
- movl 14*8(%ebp),%eax
- call PrintQword
-
- movl StringRdx, %esi
- call PrintString
- .byte 0x48
- movl 13*8(%ebp),%eax
- call PrintQword
-
- movl $0xb81e0,%edi
-
- movl StringRbx, %esi
- call PrintString
- .byte 0x48
- movl 12*8(%ebp),%eax
- call PrintQword
-
- movl StringRsp, %esi
- call PrintString
- .byte 0x48
- movl 21*8(%ebp),%eax
- call PrintQword
-
- movl StringRbp, %esi
- call PrintString
- .byte 0x48
- movl 10*8(%ebp),%eax
- call PrintQword
-
- movl $0xb8280,%edi
-
- movl StringRsi, %esi
- call PrintString
- .byte 0x48
- movl 9*8(%ebp),%eax
- call PrintQword
-
- movl StringRdi, %esi
- call PrintString
- .byte 0x48
- movl 8*8(%ebp),%eax
- call PrintQword
-
- movl StringEcode, %esi
- call PrintString
- .byte 0x48
- movl 17*8(%ebp),%eax
- call PrintQword
-
- movl $0xb8320,%edi
-
- movl StringR8, %esi
- call PrintString
- .byte 0x48
- movl 7*8(%ebp),%eax
- call PrintQword
-
- movl StringR9, %esi
- call PrintString
- .byte 0x48
- movl 6*8(%ebp),%eax
- call PrintQword
-
- movl StringR10, %esi
- call PrintString
- .byte 0x48
- movl 5*8(%ebp),%eax
- call PrintQword
-
- movl $0xb83c0,%edi
-
- movl StringR11, %esi
- call PrintString
- .byte 0x48
- movl 4*8(%ebp),%eax
- call PrintQword
-
- movl StringR12, %esi
- call PrintString
- .byte 0x48
- movl 3*8(%ebp),%eax
- call PrintQword
-
- movl StringR13, %esi
- call PrintString
- .byte 0x48
- movl 2*8(%ebp),%eax
- call PrintQword
-
- movl $0xb8460,%edi
-
- movl StringR14, %esi
- call PrintString
- .byte 0x48
- movl 1*8(%ebp),%eax
- call PrintQword
-
- movl StringR15, %esi
- call PrintString
- .byte 0x48
- movl 0*8(%ebp),%eax
- call PrintQword
-
- movl StringSs, %esi
- call PrintString
- .byte 0x48
- movl 22*8(%ebp),%eax
- call PrintQword
-
- movl $0xb8500,%edi
-
- movl StringRflags, %esi
- call PrintString
- .byte 0x48
- movl 20*8(%ebp),%eax
- call PrintQword
-
- movl $0xb8640,%edi
-
- movl %ebp,%esi
- addl $23*8,%esi
- movl $4,%ecx
-
-
-OuterLoop:
- pushl %ecx
- movl $4,%ecx
- .byte 0x48
- movl %edi,%edx
-
-InnerLoop:
- .byte 0x48
- movl (%esi),%eax
- call PrintQword
- addl $8,%esi
- mov $0x00, %al
- movb %al,(%edi)
- addl $2,%edi
- loop InnerLoop
-
- popl %ecx
- addl $0xa0,%edx
- movl %edx,%edi
- loop OuterLoop
-
-
- movl $0xb8960,%edi
-
- .byte 0x48
- movl 18*8(%ebp),%eax # RIP
- subl $8*8,%eax
- .byte 0x48
- movl %eax,%esi # esi = rip - 8 QWORD linear (total 16 QWORD)
-
- movl $4,%ecx
-
-OuterLoop1:
- pushl %ecx
- movl $4,%ecx
- movl %edi,%edx
-
-InnerLoop1:
- .byte 0x48
- movl (%esi),%eax
- call PrintQword
- addl $8,%esi
- movb $0x00, %al
- movb %al,(%edi)
- addl $2,%edi
- loop InnerLoop1
-
- popl %ecx
- addl $0xa0,%edx
- movl %edx,%edi
- loop OuterLoop1
-
-
-
- #wbinvd
+ loopl LOOP_1 # loop back through again until all descriptors are initialized\r
+\r
+ ## at this point edi contains the offset of the descriptor for INT 20\r
+ ## and bx contains the low 16 bits of the offset of the default handler\r
+ ## so initialize all the rest of the descriptors with these two values...\r
+# mov ecx, 101 ; there are 100 descriptors left (INT 20 (14h) - INT 119 (77h)\r
+#@@: ; loop through all IDT entries exception handlers and initialize to default handler\r
+# mov word ptr [edi], bx ; write bits 15..0 of offset\r
+# mov word ptr [edi+2], 38h ; SYS_CODE64_SEL from GDT\r
+# mov word ptr [edi+4], 0e00h OR 8000h ; type = 386 interrupt gate, present\r
+# mov word ptr [edi+6], ax ; write bits 31..16 of offset\r
+# mov dword ptr [edi+8], 0 ; write bits 63..32 of offset\r
+# add edi, 16 ; move up to next descriptor\r
+# loop @b ; loop back through again until all descriptors are initialized\r
+\r
+\r
+## DUMP location of IDT and several of the descriptors\r
+# mov ecx, 8\r
+# mov eax, [offset Idtr + 2]\r
+# mov eax, [eax]\r
+# mov edi, 0b8000h\r
+# call PrintQword\r
+# mov esi, eax\r
+# mov edi, 0b80a0h\r
+# jmp OuterLoop\r
+\r
+## \r
+## just for fun, let's do a software interrupt to see if we correctly land in the exception handler...\r
+# mov eax, 011111111h\r
+# mov ebx, 022222222h\r
+# mov ecx, 033333333h\r
+# mov edx, 044444444h\r
+# mov ebp, 055555555h\r
+# mov esi, 066666666h\r
+# mov edi, 077777777h\r
+# push 011111111h\r
+# push 022222222h\r
+# push 033333333h\r
+# int 119\r
+\r
+ movl $0x22000,%esi # esi = 22000\r
+ movl 0x14(%esi),%eax # eax = [22014]\r
+ addl %eax,%esi # esi = 22000 + [22014] = Base of EFILDR.C\r
+ movl 0x3c(%esi),%ebp # ebp = [22000 + [22014] + 3c] = NT Image Header for EFILDR.C\r
+ addl %esi,%ebp\r
+ movl 0x30(%ebp),%edi # edi = [[22000 + [22014] + 3c] + 2c] = ImageBase (63..32 is zero, ignore)\r
+ movl 0x28(%ebp),%eax # eax = [[22000 + [22014] + 3c] + 24] = EntryPoint\r
+ addl %edi,%eax # eax = ImageBase + EntryPoint\r
+ movl %ebx, EfiLdrOffset \r
+ movl %eax, (%ebx) # Modify far jump instruction for correct entry point\r
+\r
+ movw 6(%ebp), %bx # bx = Number of sections\r
+ xorl %eax,%eax\r
+ movw 0x14(%ebp), %ax # ax = Optional Header Size\r
+ addl %eax,%ebp\r
+ addl $0x18,%ebp # ebp = Start of 1st Section\r
+\r
+SectionLoop: \r
+ pushl %esi # Save Base of EFILDR.C\r
+ pushl %edi # Save ImageBase\r
+ addl 0x14(%ebp),%esi # esi = Base of EFILDR.C + PointerToRawData\r
+ addl 0x0c(%ebp),%edi # edi = ImageBase + VirtualAddress\r
+ movl 0x10(%ebp),%ecx # ecs = SizeOfRawData\r
+\r
+ cld\r
+ shrl $2,%ecx\r
+ rep\r
+ movsl\r
+\r
+ popl %edi # Restore ImageBase\r
+ popl %esi # Restore Base of EFILDR.C\r
+\r
+ addw $0x28,%bp # ebp = ebp + 028h = Pointer to next section record\r
+ .byte 0x66\r
+ .byte 0xff\r
+ .byte 0xcb\r
+# dec bx\r
+ cmpw $0,%bx\r
+ jne SectionLoop\r
+\r
+ movl (Idtr), %eax # get size of IDT\r
+ movzx (%edx), %eax\r
+ .byte 0xff\r
+ .byte 0xc0\r
+# inc eax\r
+ addl 2(%edx), %eax # add to base of IDT to get location of memory map...\r
+ xorl %ecx,%ecx\r
+ movl %eax,%ecx # put argument to RCX\r
+\r
+ .byte 0x48\r
+ .byte 0xc7\r
+ .byte 0xc0\r
+EfiLdrOffset: \r
+ .long 0x00401000 # Offset of EFILDR\r
+# mov rax, 401000h\r
+ .byte 0x50\r
+# push rax\r
+\r
+# ret\r
+ .byte 0xc3\r
+\r
+# db "**** DEFAULT IDT ENTRY ***",0\r
+ .align 0x2\r
+Halt: \r
+INT0: \r
+ pushl $0x0 # push error code place holder on the stack\r
+ pushl $0x0\r
+ jmpCommonIdtEntry \r
+# db 0e9h ; jmp 16 bit reletive \r
+# dd commonIdtEntry - $ - 4 ; offset to jump to\r
+\r
+INT1: \r
+ pushl $0x0 # push error code place holder on the stack\r
+ pushl $0x1\r
+ jmpCommonIdtEntry \r
+\r
+INT2: \r
+ pushl $0x0 # push error code place holder on the stack\r
+ pushl $0x2\r
+ jmpCommonIdtEntry \r
+\r
+INT3: \r
+ pushl $0x0 # push error code place holder on the stack\r
+ pushl $0x3\r
+ jmpCommonIdtEntry \r
+\r
+INT4: \r
+ pushl $0x0 # push error code place holder on the stack\r
+ pushl $0x4\r
+ jmpCommonIdtEntry \r
+\r
+INT5: \r
+ pushl $0x0 # push error code place holder on the stack\r
+ pushl $0x5\r
+ jmpCommonIdtEntry \r
+\r
+INT6: \r
+ pushl $0x0 # push error code place holder on the stack\r
+ pushl $0x6\r
+ jmpCommonIdtEntry \r
+\r
+INT7: \r
+ pushl $0x0 # push error code place holder on the stack\r
+ pushl $0x7\r
+ jmpCommonIdtEntry \r
+\r
+INT8: \r
+# Double fault causes an error code to be pushed so no phony push necessary\r
+ nop\r
+ nop\r
+ pushl $0x8\r
+ jmpCommonIdtEntry \r
+\r
+INT9: \r
+ pushl $0x0 # push error code place holder on the stack\r
+ pushl $0x9\r
+ jmpCommonIdtEntry \r
+\r
+INT10: \r
+# Invalid TSS causes an error code to be pushed so no phony push necessary\r
+ nop\r
+ nop\r
+ pushl $10\r
+ jmpCommonIdtEntry \r
+\r
+INT11: \r
+# Segment Not Present causes an error code to be pushed so no phony push necessary\r
+ nop\r
+ nop\r
+ pushl $11\r
+ jmpCommonIdtEntry \r
+\r
+INT12: \r
+# Stack fault causes an error code to be pushed so no phony push necessary\r
+ nop\r
+ nop\r
+ pushl $12\r
+ jmpCommonIdtEntry \r
+\r
+INT13: \r
+# GP fault causes an error code to be pushed so no phony push necessary\r
+ nop\r
+ nop\r
+ pushl $13\r
+ jmpCommonIdtEntry \r
+\r
+INT14: \r
+# Page fault causes an error code to be pushed so no phony push necessary\r
+ nop\r
+ nop\r
+ pushl $14\r
+ jmpCommonIdtEntry \r
+\r
+INT15: \r
+ pushl $0x0 # push error code place holder on the stack\r
+ pushl $15\r
+ jmpCommonIdtEntry \r
+\r
+INT16: \r
+ pushl $0x0 # push error code place holder on the stack\r
+ pushl $16\r
+ jmpCommonIdtEntry \r
+\r
+INT17: \r
+# Alignment check causes an error code to be pushed so no phony push necessary\r
+ nop\r
+ nop\r
+ pushl $17\r
+ jmpCommonIdtEntry \r
+\r
+INT18: \r
+ pushl $0x0 # push error code place holder on the stack\r
+ pushl $18\r
+ jmpCommonIdtEntry \r
+\r
+INT19: \r
+ pushl $0x0 # push error code place holder on the stack\r
+ pushl $19\r
+ jmpCommonIdtEntry \r
+\r
+INTUnknown: \r
+.rept (0x78 - 20)\r
+ pushl $0x0 # push error code place holder on the stack\r
+# push xxh ; push vector number\r
+ .byte 0x6a\r
+ .byte ( . - INTUnknown - 3 ) / 9 + 20 # vector number\r
+ jmpCommonIdtEntry \r
+.endr\r
+\r
+commonIdtEntry: \r
+ pushl %eax\r
+ pushl %ecx\r
+ pushl %edx\r
+ pushl %ebx\r
+ pushl %esp\r
+ pushl %ebp\r
+ pushl %esi\r
+ pushl %edi\r
+ .byte 0x41\r
+ .byte 0x50\r
+# push r8\r
+ .byte 0x41\r
+ .byte 0x51\r
+# push r9\r
+ .byte 0x41\r
+ .byte 0x52\r
+# push r10\r
+ .byte 0x41\r
+ .byte 0x53\r
+# push r11\r
+ .byte 0x41\r
+ .byte 0x54\r
+# push r12\r
+ .byte 0x41\r
+ .byte 0x55\r
+# push r13\r
+ .byte 0x41\r
+ .byte 0x56\r
+# push r14\r
+ .byte 0x41\r
+ .byte 0x57\r
+# push r15\r
+ .byte 0x48\r
+ movl %esp,%ebp\r
+# mov rbp, rsp\r
+\r
+##\r
+## At this point the stack looks like this:\r
+##\r
+## Calling SS\r
+## Calling RSP\r
+## rflags\r
+## Calling CS\r
+## Calling RIP\r
+## Error code or 0\r
+## Int num or 0ffh for unknown int num\r
+## rax\r
+## rcx\r
+## rdx\r
+## rbx\r
+## rsp\r
+## rbp\r
+## rsi\r
+## rdi\r
+## r8\r
+## r9\r
+## r10\r
+## r11\r
+## r12\r
+## r13\r
+## r14\r
+## r15 <------- RSP, RBP\r
+## \r
+\r
+ call ClearScreen\r
+ mov String1, %esi \r
+ call PrintString\r
+ .byte 0x48\r
+ movl 16*8(%ebp),%eax ## move Int number into RAX \r
+ .byte 0x48\r
+ cmpl $18,%eax\r
+ ja PrintDefaultString\r
+PrintExceptionString: \r
+ shll $3,%eax ## multiply by 8 to get offset from StringTable to actual string address\r
+ addl StringTable, %eax\r
+ movl (%eax),%esi\r
+ jmp PrintTheString\r
+PrintDefaultString: \r
+ movl IntUnknownString, %esi\r
+ # patch Int number\r
+ movl %eax,%edx\r
+ call A2C\r
+ movb %al,1(%esi)\r
+ movl %edx,%eax\r
+ shrl $4,%eax\r
+ call A2C\r
+ movb %al,(%esi)\r
+PrintTheString: \r
+ call PrintString\r
+ movl String2, %esi\r
+ call PrintString\r
+ .byte 0x48\r
+ movl 19*8(%ebp),%eax # CS\r
+ call PrintQword\r
+ movb $':', %al\r
+ movb %al, (%edi)\r
+ addl $2,%edi\r
+ .byte 0x48\r
+ movl 18*8(%ebp),%eax # RIP\r
+ call PrintQword\r
+ movl String3, %esi\r
+ call PrintString\r
+\r
+ movl $0xb8140,%edi\r
+\r
+ movl StringRax, %esi\r
+ call PrintString\r
+ .byte 0x48\r
+ movl 15*8(%ebp),%eax\r
+ call PrintQword\r
+\r
+ movl StringRcx, %esi\r
+ call PrintString\r
+ .byte 0x48\r
+ movl 14*8(%ebp),%eax\r
+ call PrintQword\r
+\r
+ movl StringRdx, %esi\r
+ call PrintString\r
+ .byte 0x48\r
+ movl 13*8(%ebp),%eax\r
+ call PrintQword\r
+\r
+ movl $0xb81e0,%edi\r
+\r
+ movl StringRbx, %esi\r
+ call PrintString\r
+ .byte 0x48\r
+ movl 12*8(%ebp),%eax\r
+ call PrintQword\r
+\r
+ movl StringRsp, %esi\r
+ call PrintString\r
+ .byte 0x48\r
+ movl 21*8(%ebp),%eax\r
+ call PrintQword\r
+\r
+ movl StringRbp, %esi\r
+ call PrintString\r
+ .byte 0x48\r
+ movl 10*8(%ebp),%eax\r
+ call PrintQword\r
+\r
+ movl $0xb8280,%edi\r
+\r
+ movl StringRsi, %esi\r
+ call PrintString\r
+ .byte 0x48\r
+ movl 9*8(%ebp),%eax\r
+ call PrintQword\r
+\r
+ movl StringRdi, %esi\r
+ call PrintString\r
+ .byte 0x48\r
+ movl 8*8(%ebp),%eax\r
+ call PrintQword\r
+\r
+ movl StringEcode, %esi\r
+ call PrintString\r
+ .byte 0x48\r
+ movl 17*8(%ebp),%eax\r
+ call PrintQword\r
+\r
+ movl $0xb8320,%edi\r
+\r
+ movl StringR8, %esi\r
+ call PrintString\r
+ .byte 0x48\r
+ movl 7*8(%ebp),%eax\r
+ call PrintQword\r
+\r
+ movl StringR9, %esi\r
+ call PrintString\r
+ .byte 0x48\r
+ movl 6*8(%ebp),%eax\r
+ call PrintQword\r
+\r
+ movl StringR10, %esi\r
+ call PrintString\r
+ .byte 0x48\r
+ movl 5*8(%ebp),%eax\r
+ call PrintQword\r
+\r
+ movl $0xb83c0,%edi\r
+\r
+ movl StringR11, %esi\r
+ call PrintString\r
+ .byte 0x48\r
+ movl 4*8(%ebp),%eax\r
+ call PrintQword\r
+\r
+ movl StringR12, %esi\r
+ call PrintString\r
+ .byte 0x48\r
+ movl 3*8(%ebp),%eax\r
+ call PrintQword\r
+\r
+ movl StringR13, %esi\r
+ call PrintString\r
+ .byte 0x48\r
+ movl 2*8(%ebp),%eax\r
+ call PrintQword\r
+\r
+ movl $0xb8460,%edi\r
+\r
+ movl StringR14, %esi\r
+ call PrintString\r
+ .byte 0x48\r
+ movl 1*8(%ebp),%eax\r
+ call PrintQword\r
+\r
+ movl StringR15, %esi\r
+ call PrintString\r
+ .byte 0x48\r
+ movl 0*8(%ebp),%eax\r
+ call PrintQword\r
+\r
+ movl StringSs, %esi\r
+ call PrintString\r
+ .byte 0x48\r
+ movl 22*8(%ebp),%eax\r
+ call PrintQword\r
+\r
+ movl $0xb8500,%edi\r
+\r
+ movl StringRflags, %esi\r
+ call PrintString\r
+ .byte 0x48\r
+ movl 20*8(%ebp),%eax\r
+ call PrintQword\r
+\r
+ movl $0xb8640,%edi\r
+\r
+ movl %ebp,%esi\r
+ addl $23*8,%esi\r
+ movl $4,%ecx\r
+\r
+\r
+OuterLoop: \r
+ pushl %ecx\r
+ movl $4,%ecx\r
+ .byte 0x48\r
+ movl %edi,%edx\r
+\r
+InnerLoop: \r
+ .byte 0x48\r
+ movl (%esi),%eax\r
+ call PrintQword\r
+ addl $8,%esi\r
+ mov $0x00, %al \r
+ movb %al,(%edi)\r
+ addl $2,%edi\r
+ loop InnerLoop\r
+\r
+ popl %ecx\r
+ addl $0xa0,%edx\r
+ movl %edx,%edi\r
+ loop OuterLoop\r
+\r
+\r
+ movl $0xb8960,%edi\r
+\r
+ .byte 0x48\r
+ movl 18*8(%ebp),%eax # RIP\r
+ subl $8*8,%eax\r
+ .byte 0x48\r
+ movl %eax,%esi # esi = rip - 8 QWORD linear (total 16 QWORD)\r
+\r
+ movl $4,%ecx\r
+\r
+OuterLoop1: \r
+ pushl %ecx\r
+ movl $4,%ecx\r
+ movl %edi,%edx\r
+\r
+InnerLoop1: \r
+ .byte 0x48\r
+ movl (%esi),%eax\r
+ call PrintQword\r
+ addl $8,%esi\r
+ movb $0x00, %al\r
+ movb %al,(%edi)\r
+ addl $2,%edi\r
+ loop InnerLoop1\r
+\r
+ popl %ecx\r
+ addl $0xa0,%edx\r
+ movl %edx,%edi\r
+ loop OuterLoop1\r
+\r
+\r
+\r
+ #wbinvd\r
LN_C1: \r
- jmp LN_C1
-
-#
-# return
-#
- movl %ebp,%esp
-# mov rsp, rbp
- .byte 0x41
- .byte 0x5f
-# pop r15
- .byte 0x41
- .byte 0x5e
-# pop r14
- .byte 0x41
- .byte 0x5d
-# pop r13
- .byte 0x41
- .byte 0x5c
-# pop r12
- .byte 0x41
- .byte 0x5b
-# pop r11
- .byte 0x41
- .byte 0x5a
-# pop r10
- .byte 0x41
- .byte 0x59
-# pop r9
- .byte 0x41
- .byte 0x58
-# pop r8
- popl %edi
- popl %esi
- popl %ebp
- popl %eax # esp
- popl %ebx
- popl %edx
- popl %ecx
- popl %eax
-
- .byte 0x48
- .byte 0x83
- .byte 0xc4
- .byte 0x10
-# add esp, 16 ; error code and INT number
-
- .byte 0x48
- .byte 0xcf
-# iretq
-
-PrintString:
- pushl %eax
-LN_C2:
- movb (%esi), %al
- cmpb $0,%al
- je LN_C3
- movb %al, (%edi)
- .byte 0xff
- .byte 0xc6
-# inc esi
- addl $2,%edi
- jmp LN_C2
-LN_C3:
- popl %eax
- ret
-
-## RAX contains qword to print
-## RDI contains memory location (screen location) to print it to
-PrintQword:
- pushl %ecx
- pushl %ebx
- pushl %eax
-
- .byte 0x48
- .byte 0xc7
- .byte 0xc1
- .long 16
-# mov rcx, 16
-looptop:
- .byte 0x48
- roll $4,%eax
- movb %al,%bl
- andb $0xf,%bl
- addb $'0', %bl
- cmpb $'9', %bl
- jle @f
- addb $7,%bl
-@@:
- movb %bl, (%edi)
- addl $2,%edi
- loop looptop
- #wbinvd
-
- popl %eax
- popl %ebx
- popl %ecx
- ret
-
-ClearScreen:
- pushl %eax
- pushl %ecx
-
- movb $0x00, %al
- movb $0xc,%ah
- movl $0xb8000,%edi
- movl $80*24,%ecx
-LN_C4:
- movw %ax, (%edi)
- addl $2,%edi
- loop LN_C4
- movl $0xb8000,%edi
-
- popl %ecx
- popl %eax
-
- ret
-
-A2C:
- andb $0xf,%al
- addb $'0', %al
- cmpb $'9', %al
- jle @f
- addb $7,%al
-LN_C5:
- ret
-
-String1: .asciz "*** INT "
-
+ jmp LN_C1\r
+\r
+#\r
+# return\r
+#\r
+ movl %ebp,%esp\r
+# mov rsp, rbp\r
+ .byte 0x41\r
+ .byte 0x5f\r
+# pop r15\r
+ .byte 0x41\r
+ .byte 0x5e\r
+# pop r14\r
+ .byte 0x41\r
+ .byte 0x5d\r
+# pop r13\r
+ .byte 0x41\r
+ .byte 0x5c\r
+# pop r12\r
+ .byte 0x41\r
+ .byte 0x5b\r
+# pop r11\r
+ .byte 0x41\r
+ .byte 0x5a\r
+# pop r10\r
+ .byte 0x41\r
+ .byte 0x59\r
+# pop r9\r
+ .byte 0x41\r
+ .byte 0x58\r
+# pop r8\r
+ popl %edi\r
+ popl %esi\r
+ popl %ebp\r
+ popl %eax # esp\r
+ popl %ebx\r
+ popl %edx\r
+ popl %ecx\r
+ popl %eax\r
+\r
+ .byte 0x48\r
+ .byte 0x83\r
+ .byte 0xc4\r
+ .byte 0x10\r
+# add esp, 16 ; error code and INT number\r
+\r
+ .byte 0x48\r
+ .byte 0xcf\r
+# iretq\r
+\r
+PrintString: \r
+ pushl %eax\r
+LN_C2: \r
+ movb (%esi), %al\r
+ cmpb $0,%al\r
+ je LN_C3\r
+ movb %al, (%edi)\r
+ .byte 0xff\r
+ .byte 0xc6\r
+# inc esi\r
+ addl $2,%edi\r
+ jmp LN_C2\r
+LN_C3: \r
+ popl %eax\r
+ ret\r
+\r
+## RAX contains qword to print\r
+## RDI contains memory location (screen location) to print it to\r
+PrintQword: \r
+ pushl %ecx\r
+ pushl %ebx\r
+ pushl %eax\r
+\r
+ .byte 0x48\r
+ .byte 0xc7\r
+ .byte 0xc1\r
+ .long 16\r
+# mov rcx, 16\r
+looptop: \r
+ .byte 0x48\r
+ roll $4,%eax\r
+ movb %al,%bl\r
+ andb $0xf,%bl\r
+ addb $'0', %bl\r
+ cmpb $'9', %bl\r
+ jle @f\r
+ addb $7,%bl\r
+@@: \r
+ movb %bl, (%edi)\r
+ addl $2,%edi\r
+ loop looptop\r
+ #wbinvd\r
+\r
+ popl %eax\r
+ popl %ebx\r
+ popl %ecx\r
+ ret\r
+\r
+ClearScreen: \r
+ pushl %eax\r
+ pushl %ecx\r
+\r
+ movb $0x00, %al\r
+ movb $0xc,%ah\r
+ movl $0xb8000,%edi\r
+ movl $80*24,%ecx\r
+LN_C4: \r
+ movw %ax, (%edi)\r
+ addl $2,%edi\r
+ loop LN_C4\r
+ movl $0xb8000,%edi\r
+\r
+ popl %ecx\r
+ popl %eax\r
+\r
+ ret\r
+\r
+A2C: \r
+ andb $0xf,%al\r
+ addb $'0', %al\r
+ cmpb $'9', %al\r
+ jle @f\r
+ addb $7,%al\r
+LN_C5: \r
+ ret\r
+\r
+String1: .asciz "*** INT "\r
+\r
Int0String: .asciz "00h Divide by 0 -"\r
Int1String: .asciz "01h Debug exception -"\r
Int2String: .asciz "02h NMI -"\r
Int17String: .asciz "11h Alignment check -"\r
Int18String: .asciz "12h Machine check -"\r
Int19String: .asciz "13h SIMD Floating-Point Exception -"\r
-IntUnknownString: .asciz "??h Unknown interrupt -"
-
+IntUnknownString: .asciz "??h Unknown interrupt -"\r
+\r
StringTable: .long Int0String, Int1String, Int2String, Int3String, \\r
Int4String, Int5String, Int6String, Int7String, \\r
Int8String, Int9String, Int10String, Int11String, \\r
Int12String, Int13String, Int14String, Int15String,\\r
- Int16String, Int17String, Int18String, Int19String
-
-String2: .asciz " HALT!! *** ("
-String3: .asciz ")"
-StringRax: .asciz "RAX="
-StringRcx: .asciz " RCX="
-StringRdx: .asciz " RDX="
-StringRbx: .asciz "RBX="
-StringRsp: .asciz " RSP="
-StringRbp: .asciz " RBP="
-StringRsi: .asciz "RSI="
-StringRdi: .asciz " RDI="
-StringEcode: .asciz " ECODE="
-StringR8: .asciz "R8 ="
-StringR9: .asciz " R9 ="
-StringR10: .asciz " R10="
-StringR11: .asciz "R11="
-StringR12: .asciz " R12="
-StringR13: .asciz " R13="
-StringR14: .asciz "R14="
-StringR15: .asciz " R15="
-StringSs: .asciz " SS ="
-StringRflags: .asciz "RFLAGS="
-
-Idtr: .float 0
- .float 0
-
- .org 0x21ffe
-BlockSignature:
- .word 0xaa55
-
+ Int16String, Int17String, Int18String, Int19String\r
+\r
+String2: .asciz " HALT!! *** ("\r
+String3: .asciz ")"\r
+StringRax: .asciz "RAX="\r
+StringRcx: .asciz " RCX="\r
+StringRdx: .asciz " RDX="\r
+StringRbx: .asciz "RBX="\r
+StringRsp: .asciz " RSP="\r
+StringRbp: .asciz " RBP="\r
+StringRsi: .asciz "RSI="\r
+StringRdi: .asciz " RDI="\r
+StringEcode: .asciz " ECODE="\r
+StringR8: .asciz "R8 ="\r
+StringR9: .asciz " R9 ="\r
+StringR10: .asciz " R10="\r
+StringR11: .asciz "R11="\r
+StringR12: .asciz " R12="\r
+StringR13: .asciz " R13="\r
+StringR14: .asciz "R14="\r
+StringR15: .asciz " R15="\r
+StringSs: .asciz " SS ="\r
+StringRflags: .asciz "RFLAGS="\r
+\r
+Idtr: .float 0\r
+ .float 0\r
+\r
+ .org 0x21ffe\r
+BlockSignature: \r
+ .word 0xaa55\r
+\r
-#------------------------------------------------------------------------------
-#*
-#* Copyright 2006 - 2007, Intel Corporation
-#* All rights reserved. This program and the accompanying materials
-#* are licensed and made available under the terms and conditions of the BSD License
-#* which accompanies this distribution. The full text of the license may be found at
-#* http://opensource.org/licenses/bsd-license.php
-#*
-#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
-#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
-#*
-#* st16_64.asm
-#*
-#* Abstract:
-#*
-#------------------------------------------------------------------------------
-
-
- .stack:
- .486p:
- .code16
-
+#------------------------------------------------------------------------------\r
+#*\r
+#* Copyright 2006 - 2007, Intel Corporation \r
+#* All rights reserved. This program and the accompanying materials \r
+#* are licensed and made available under the terms and conditions of the BSD License \r
+#* which accompanies this distribution. The full text of the license may be found at \r
+#* http://opensource.org/licenses/bsd-license.php \r
+#* \r
+#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r
+#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r
+#* \r
+#* st16_64.asm\r
+#* \r
+#* Abstract:\r
+#*\r
+#------------------------------------------------------------------------------\r
+\r
+\r
+ .stack: \r
+ .486p: \r
+ .code16\r
+\r
.equ FAT_DIRECTORY_ENTRY_SIZE, 0x020\r
.equ FAT_DIRECTORY_ENTRY_SHIFT, 5\r
.equ BLOCK_SIZE, 0x0200\r
.equ BLOCK_MASK, 0x01ff\r
-.equ BLOCK_SHIFT, 9
-
- .org 0x0
-Ia32Jump:
- jmp BootSectorEntryPoint # JMP inst - 3 bytes
- nop
-
+.equ BLOCK_SHIFT, 9\r
+\r
+ .org 0x0\r
+Ia32Jump: \r
+ jmp BootSectorEntryPoint # JMP inst - 3 bytes\r
+ nop\r
+\r
OemId: .ascii "INTEL " # OemId - 8 bytes\r
\r
SectorSize: .word 0 # Sector Size - 16 bits\r
VolId: .ascii " " # Volume Serial Number- 4 bytes\r
FatLabel: .ascii " " # Label - 11 bytes\r
SystemId: .ascii "FAT16 " # SystemId - 8 bytes\r
-
-BootSectorEntryPoint:
- # ASSUME ds:@code
- # ASSUME ss:@code
- # ds = 1000, es = 2000 + x (size of first cluster >> 4)
- # cx = Start Cluster of EfiLdr
- # dx = Start Cluster of Efivar.bin
-
-# Re use the BPB data stored in Boot Sector
- movw $0x7c00,%bp
-
- pushw %cx
-# Read Efivar.bin
-# 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already
- movw $0x1900,%ax
- movw %ax,%es
- testw %dx,%dx
- jnz CheckVarStoreSize
-
- movb $1,%al
-NoVarStore:
- pushw %es
-# Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl
- movb %al, %es:(4)
- jmp SaveVolumeId
-
-CheckVarStoreSize:
- movw %dx,%di
- cmpl $0x4000, %ds:2(%di)
- movb $2,%al
- jne NoVarStore
-
-LoadVarStore:
- movb $0,%al
+\r
+BootSectorEntryPoint: \r
+ # ASSUME ds:@code\r
+ # ASSUME ss:@code\r
+ # ds = 1000, es = 2000 + x (size of first cluster >> 4)\r
+ # cx = Start Cluster of EfiLdr\r
+ # dx = Start Cluster of Efivar.bin\r
+\r
+# Re use the BPB data stored in Boot Sector\r
+ movw $0x7c00,%bp\r
+\r
+ pushw %cx\r
+# Read Efivar.bin\r
+# 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already\r
+ movw $0x1900,%ax\r
+ movw %ax,%es\r
+ testw %dx,%dx\r
+ jnz CheckVarStoreSize\r
+\r
+ movb $1,%al\r
+NoVarStore: \r
+ pushw %es\r
+# Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl\r
+ movb %al, %es:(4)\r
+ jmp SaveVolumeId\r
+\r
+CheckVarStoreSize: \r
+ movw %dx,%di\r
+ cmpl $0x4000, %ds:2(%di)\r
+ movb $2,%al\r
+ jne NoVarStore\r
+\r
+LoadVarStore: \r
+ movb $0,%al\r
movb %al, %es:(4)\r
- movw (%di), %cx
-# ES:DI = 1500:0
- xorw %di,%di
- pushw %es
- movw $0x1500,%ax
- movw %ax,%es
- call ReadFile
-SaveVolumeId:
- popw %es
+ movw (%di), %cx\r
+# ES:DI = 1500:0\r
+ xorw %di,%di\r
+ pushw %es\r
+ movw $0x1500,%ax\r
+ movw %ax,%es\r
+ call ReadFile\r
+SaveVolumeId: \r
+ popw %es\r
movw VolId(%bp), %ax\r
movw %ax, %es:(0) # Save Volume Id to 0:19000. we will find the correct volume according to this VolumeId\r
movw VolId+2(%bp), %ax\r
- movw %ax, %es:(2)
-
-# Read Efildr
- popw %cx
-# cx = Start Cluster of Efildr -> BS.com has filled already
-# ES:DI = 2000:0, first cluster will be read again
- xorw %di,%di # di = 0
- movw $0x2000,%ax
- movw %ax,%es
- call ReadFile
- movw %cs,%ax
- movw %ax, %cs:JumpSegment
-
-CheckEm64T:
- movl $0x80000001,%eax
-# cpuid
- .word 0xA20F
- btl $29,%edx
- jc CheckEm64TPass
- pushw %cs
- popw %ds
- leaw Em64String,%si
- movw $18,%cx
- jmp PrintStringAndHalt
-CheckEm64TPass:
-jumpFarInstruction:
- .byte 0xea
-jumpOffset:
- .word 0x200
-jumpSegment:
- .word 0x2000
-
-
-
-# ****************************************************************************
-# ReadFile
-#
-# Arguments:
-# CX = Start Cluster of File
-# ES:DI = Buffer to store file content read from disk
-#
-# Return:
-# (ES << 4 + DI) = end of file content Buffer
-#
-# ****************************************************************************
-ReadFile:
-# si = NumberOfClusters
-# cx = ClusterNumber
-# dx = CachedFatSectorNumber
-# ds:0000 = CacheFatSectorBuffer
-# es:di = Buffer to load file
-# bx = NextClusterNumber
- pusha
- movw $1,%si # NumberOfClusters = 1
- pushw %cx # Push Start Cluster onto stack
- movw $0xfff,%dx # CachedFatSectorNumber = 0xfff
-FatChainLoop:
- movw %cx,%ax # ax = ClusterNumber
- andw $0xfff8,%ax # ax = ax & 0xfff8
- cmpw $0xfff8,%ax # See if this is the last cluster
- je FoundLastCluster # Jump if last cluster found
- movw %cx,%ax # ax = ClusterNumber
- shlw %ax # FatOffset = ClusterNumber * 2
- pushw %si # Save si
- movw %ax,%si # si = FatOffset
- shrw $BLOCK_SHIFT, %ax # ax = FatOffset >> BLOCK_SHIFT
- addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET)
- andw $BLOCK_MASK, %si # si = FatOffset & BLOCK_MASK
- cmpw %dx,%ax # Compare FatSectorNumber to CachedFatSectorNumber
- je SkipFatRead
- movw $2,%bx
- pushw %es
- pushw %ds
- popw %es
- call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI
- popw %es
- movw %ax,%dx # CachedFatSectorNumber = FatSectorNumber
-SkipFatRead:
- movw (%si), %bx # bx = NextClusterNumber
- movw %cx,%ax # ax = ClusterNumber
- popw %si # Restore si
- decw %bx # bx = NextClusterNumber - 1
- cmpw %cx,%bx # See if (NextClusterNumber-1)==ClusterNumber
- jne ReadClusters
- incw %bx # bx = NextClusterNumber
- incw %si # NumberOfClusters++
- movw %bx,%cx # ClusterNumber = NextClusterNumber
- jmp FatChainLoop
-ReadClusters:
- incw %bx
- popw %ax # ax = StartCluster
- pushw %bx # StartCluster = NextClusterNumber
- movw %bx,%cx # ClusterNumber = NextClusterNumber
- subw $2,%ax # ax = StartCluster - 2
- xorb %bh,%bh
- movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster
- mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster
- addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster
- pushw %ax # save start sector
- movw %si,%ax # ax = NumberOfClusters
- mulw %bx # ax = NumberOfClusters * SectorsPerCluster
- movw %ax,%bx # bx = Number of Sectors
- popw %ax # ax = Start Sector
- call ReadBlocks
- movw $1,%si # NumberOfClusters = 1
- jmp FatChainLoop
-FoundLastCluster:
- popw %cx
- popa
- ret
-
-
-# ****************************************************************************
-# ReadBlocks - Reads a set of blocks from a block device
-#
-# AX = Start LBA
-# BX = Number of Blocks to Read
-# ES:DI = Buffer to store sectors read from disk
-# ****************************************************************************
-
-# cx = Blocks
-# bx = NumberOfBlocks
-# si = StartLBA
-
-ReadBlocks:
- pusha
+ movw %ax, %es:(2)\r
+\r
+# Read Efildr\r
+ popw %cx\r
+# cx = Start Cluster of Efildr -> BS.com has filled already\r
+# ES:DI = 2000:0, first cluster will be read again\r
+ xorw %di,%di # di = 0\r
+ movw $0x2000,%ax\r
+ movw %ax,%es\r
+ call ReadFile\r
+ movw %cs,%ax\r
+ movw %ax, %cs:JumpSegment\r
+\r
+CheckEm64T: \r
+ movl $0x80000001,%eax\r
+# cpuid\r
+ .word 0xA20F\r
+ btl $29,%edx\r
+ jc CheckEm64TPass\r
+ pushw %cs\r
+ popw %ds\r
+ leaw Em64String,%si\r
+ movw $18,%cx\r
+ jmp PrintStringAndHalt\r
+CheckEm64TPass: \r
+jumpFarInstruction: \r
+ .byte 0xea\r
+jumpOffset: \r
+ .word 0x200\r
+jumpSegment: \r
+ .word 0x2000\r
+\r
+\r
+\r
+# ****************************************************************************\r
+# ReadFile\r
+#\r
+# Arguments:\r
+# CX = Start Cluster of File\r
+# ES:DI = Buffer to store file content read from disk\r
+#\r
+# Return:\r
+# (ES << 4 + DI) = end of file content Buffer\r
+#\r
+# ****************************************************************************\r
+ReadFile: \r
+# si = NumberOfClusters\r
+# cx = ClusterNumber\r
+# dx = CachedFatSectorNumber\r
+# ds:0000 = CacheFatSectorBuffer\r
+# es:di = Buffer to load file\r
+# bx = NextClusterNumber\r
+ pusha\r
+ movw $1,%si # NumberOfClusters = 1\r
+ pushw %cx # Push Start Cluster onto stack\r
+ movw $0xfff,%dx # CachedFatSectorNumber = 0xfff\r
+FatChainLoop: \r
+ movw %cx,%ax # ax = ClusterNumber \r
+ andw $0xfff8,%ax # ax = ax & 0xfff8\r
+ cmpw $0xfff8,%ax # See if this is the last cluster\r
+ je FoundLastCluster # Jump if last cluster found\r
+ movw %cx,%ax # ax = ClusterNumber\r
+ shlw %ax # FatOffset = ClusterNumber * 2\r
+ pushw %si # Save si\r
+ movw %ax,%si # si = FatOffset\r
+ shrw $BLOCK_SHIFT, %ax # ax = FatOffset >> BLOCK_SHIFT\r
+ addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET)\r
+ andw $BLOCK_MASK, %si # si = FatOffset & BLOCK_MASK\r
+ cmpw %dx,%ax # Compare FatSectorNumber to CachedFatSectorNumber\r
+ je SkipFatRead\r
+ movw $2,%bx\r
+ pushw %es\r
+ pushw %ds\r
+ popw %es\r
+ call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI\r
+ popw %es\r
+ movw %ax,%dx # CachedFatSectorNumber = FatSectorNumber\r
+SkipFatRead: \r
+ movw (%si), %bx # bx = NextClusterNumber\r
+ movw %cx,%ax # ax = ClusterNumber\r
+ popw %si # Restore si\r
+ decw %bx # bx = NextClusterNumber - 1\r
+ cmpw %cx,%bx # See if (NextClusterNumber-1)==ClusterNumber\r
+ jne ReadClusters\r
+ incw %bx # bx = NextClusterNumber\r
+ incw %si # NumberOfClusters++\r
+ movw %bx,%cx # ClusterNumber = NextClusterNumber\r
+ jmp FatChainLoop\r
+ReadClusters: \r
+ incw %bx\r
+ popw %ax # ax = StartCluster\r
+ pushw %bx # StartCluster = NextClusterNumber\r
+ movw %bx,%cx # ClusterNumber = NextClusterNumber\r
+ subw $2,%ax # ax = StartCluster - 2\r
+ xorb %bh,%bh\r
+ movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster\r
+ mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster\r
+ addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster\r
+ pushw %ax # save start sector\r
+ movw %si,%ax # ax = NumberOfClusters\r
+ mulw %bx # ax = NumberOfClusters * SectorsPerCluster\r
+ movw %ax,%bx # bx = Number of Sectors\r
+ popw %ax # ax = Start Sector\r
+ call ReadBlocks\r
+ movw $1,%si # NumberOfClusters = 1\r
+ jmp FatChainLoop\r
+FoundLastCluster: \r
+ popw %cx\r
+ popa\r
+ ret\r
+\r
+\r
+# ****************************************************************************\r
+# ReadBlocks - Reads a set of blocks from a block device\r
+#\r
+# AX = Start LBA\r
+# BX = Number of Blocks to Read\r
+# ES:DI = Buffer to store sectors read from disk\r
+# ****************************************************************************\r
+\r
+# cx = Blocks\r
+# bx = NumberOfBlocks\r
+# si = StartLBA\r
+\r
+ReadBlocks: \r
+ pusha\r
addl LBAOffsetForBootSector(%bp), %eax # Add LBAOffsetForBootSector to Start LBA\r
- addl HiddenSectors(%bp), %eax # Add HiddenSectors to Start LBA
- movl %eax,%esi # esi = Start LBA
- movw %bx,%cx # cx = Number of blocks to read
-ReadCylinderLoop:
- movw $0x7bfc,%bp # bp = 0x7bfc
- movl %esi,%eax # eax = Start LBA
- xorl %edx,%edx # edx = 0
- movzwl (%bp), %ebx # bx = MaxSector
- divl %ebx # ax = StartLBA / MaxSector
- incw %dx # dx = (StartLBA % MaxSector) + 1
-
- movw (%bp), %bx # bx = MaxSector
- subw %dx,%bx # bx = MaxSector - Sector
- incw %bx # bx = MaxSector - Sector + 1
- cmpw %bx,%cx # Compare (Blocks) to (MaxSector - Sector + 1)
- jg LimitTransfer
- movw %cx,%bx # bx = Blocks
-LimitTransfer:
- pushw %ax # save ax
- movw %es,%ax # ax = es
- shrw $(BLOCK_SHIFT-4), %ax # ax = Number of blocks into mem system
- andw $0x7f,%ax # ax = Number of blocks into current seg
- addw %bx,%ax # ax = End Block number of transfer
- cmpw $0x80,%ax # See if it crosses a 64K boundry
- jle NotCrossing64KBoundry # Branch if not crossing 64K boundry
- subw $0x80,%ax # ax = Number of blocks past 64K boundry
- subw %ax,%bx # Decrease transfer size by block overage
-NotCrossing64KBoundry:
- popw %ax # restore ax
-
- pushw %cx
- movb %dl,%cl # cl = (StartLBA % MaxSector) + 1 = Sector
- xorw %dx,%dx # dx = 0
+ addl HiddenSectors(%bp), %eax # Add HiddenSectors to Start LBA\r
+ movl %eax,%esi # esi = Start LBA\r
+ movw %bx,%cx # cx = Number of blocks to read\r
+ReadCylinderLoop: \r
+ movw $0x7bfc,%bp # bp = 0x7bfc\r
+ movl %esi,%eax # eax = Start LBA\r
+ xorl %edx,%edx # edx = 0\r
+ movzwl (%bp), %ebx # bx = MaxSector\r
+ divl %ebx # ax = StartLBA / MaxSector\r
+ incw %dx # dx = (StartLBA % MaxSector) + 1\r
+\r
+ movw (%bp), %bx # bx = MaxSector\r
+ subw %dx,%bx # bx = MaxSector - Sector\r
+ incw %bx # bx = MaxSector - Sector + 1\r
+ cmpw %bx,%cx # Compare (Blocks) to (MaxSector - Sector + 1)\r
+ jg LimitTransfer\r
+ movw %cx,%bx # bx = Blocks\r
+LimitTransfer: \r
+ pushw %ax # save ax\r
+ movw %es,%ax # ax = es\r
+ shrw $(BLOCK_SHIFT-4), %ax # ax = Number of blocks into mem system\r
+ andw $0x7f,%ax # ax = Number of blocks into current seg\r
+ addw %bx,%ax # ax = End Block number of transfer\r
+ cmpw $0x80,%ax # See if it crosses a 64K boundry\r
+ jle NotCrossing64KBoundry # Branch if not crossing 64K boundry\r
+ subw $0x80,%ax # ax = Number of blocks past 64K boundry\r
+ subw %ax,%bx # Decrease transfer size by block overage\r
+NotCrossing64KBoundry: \r
+ popw %ax # restore ax\r
+\r
+ pushw %cx\r
+ movb %dl,%cl # cl = (StartLBA % MaxSector) + 1 = Sector\r
+ xorw %dx,%dx # dx = 0\r
divw 2(%bp) # ax = ax / (MaxHead + 1) = Cylinder \r
- # dx = ax % (MaxHead + 1) = Head
-
- pushw %bx # Save number of blocks to transfer
- movb %dl,%dh # dh = Head
- movw $0x7c00,%bp # bp = 0x7c00
- movb PhysicalDrive(%bp), %dl # dl = Drive Number
- movb %al,%ch # ch = Cylinder
- movb %bl,%al # al = Blocks
- movb $2,%ah # ah = Function 2
- movw %di,%bx # es:bx = Buffer address
- int $0x13
- jc DiskError
- popw %bx
- popw %cx
- movzwl %bx,%ebx
- addl %ebx,%esi # StartLBA = StartLBA + NumberOfBlocks
- subw %bx,%cx # Blocks = Blocks - NumberOfBlocks
- movw %es,%ax
- shlw $(BLOCK_SHIFT-4), %bx
- addw %bx,%ax
- movw %ax,%es # es:di = es:di + NumberOfBlocks*BLOCK_SIZE
- cmpw $0,%cx
- jne ReadCylinderLoop
- popa
- ret
-
-DiskError:
- pushw %cs
- popw %ds
- leaw ErrorString,%si
- movw $7,%cx
- jmp PrintStringAndHalt
-
-PrintStringAndHalt:
- movw $0xb800,%ax
- movw %ax,%es
- movw $160,%di
- rep
- movsw
-Halt:
- jmp Halt
-
+ # dx = ax % (MaxHead + 1) = Head\r
+\r
+ pushw %bx # Save number of blocks to transfer\r
+ movb %dl,%dh # dh = Head\r
+ movw $0x7c00,%bp # bp = 0x7c00\r
+ movb PhysicalDrive(%bp), %dl # dl = Drive Number\r
+ movb %al,%ch # ch = Cylinder\r
+ movb %bl,%al # al = Blocks\r
+ movb $2,%ah # ah = Function 2\r
+ movw %di,%bx # es:bx = Buffer address\r
+ int $0x13\r
+ jc DiskError\r
+ popw %bx\r
+ popw %cx\r
+ movzwl %bx,%ebx\r
+ addl %ebx,%esi # StartLBA = StartLBA + NumberOfBlocks\r
+ subw %bx,%cx # Blocks = Blocks - NumberOfBlocks\r
+ movw %es,%ax\r
+ shlw $(BLOCK_SHIFT-4), %bx\r
+ addw %bx,%ax\r
+ movw %ax,%es # es:di = es:di + NumberOfBlocks*BLOCK_SIZE\r
+ cmpw $0,%cx\r
+ jne ReadCylinderLoop\r
+ popa\r
+ ret\r
+\r
+DiskError: \r
+ pushw %cs\r
+ popw %ds\r
+ leaw ErrorString,%si\r
+ movw $7,%cx\r
+ jmp PrintStringAndHalt\r
+\r
+PrintStringAndHalt: \r
+ movw $0xb800,%ax\r
+ movw %ax,%es\r
+ movw $160,%di\r
+ rep\r
+ movsw\r
+Halt: \r
+ jmp Halt\r
+\r
ErrorString: \r
- .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!',0x0c
-
- .org 0x01fa
-LBAOffsetForBootSector:
- .long 0x0
-
- .org 0x01fe
- .word 0xaa55
-
-#******************************************************************************
-#******************************************************************************
-#******************************************************************************
-
-.equ DELAY_PORT, 0x0ed # Port to use for 1uS delay
-.equ KBD_CONTROL_PORT, 0x060 # 8042 control port
-.equ KBD_STATUS_PORT, 0x064 # 8042 status port
-.equ WRITE_DATA_PORT_CMD, 0x0d1 # 8042 command to write the data port
-.equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20
-
- .org 0x200
- jmp start
-Em64String:
-.byte 'E', 0x0c, 'm', 0x0c, '6', 0x0c, '4', 0x0c, 'T', 0x0c, ' ', 0x0c, 'U', 0x0c, 'n', 0x0c, 's', 0x0c, 'u', 0x0c, 'p', 0x0c, 'p', 0x0c, 'o', 0x0c, 'r', 0x0c, 't', 0x0c, 'e', 0x0c, 'd', 0x0c, '!', 0x0c
-
-start:
- movw %cs,%ax
- movw %ax,%ds
- movw %ax,%es
- movw %ax,%ss
- movw $MyStack, %sp
-
-# mov ax,0b800h
-# mov es,ax
-# mov byte ptr es:[160],'a'
-# mov ax,cs
-# mov es,ax
-
- movl $0,%ebx
- leal MemoryMap, %edi
-MemMapLoop:
- movl $0xe820,%eax
- movl $20,%ecx
- movl $0x534d4150, %edx # SMAP
- int $0x15
- jc MemMapDone
- addl $20,%edi
- cmpl $0,%ebx
- je MemMapDone
- jmp MemMapLoop
-MemMapDone:
- leal MemoryMap, %eax
- subl %eax,%edi # Get the address of the memory map
- movl %edi, MemoryMapSize # Save the size of the memory map
-
- xorl %ebx,%ebx
- movw %cs,%bx # BX=segment
- shll $4,%ebx # BX="linear" address of segment base
+ .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!',0x0c\r
+\r
+ .org 0x01fa\r
+LBAOffsetForBootSector: \r
+ .long 0x0\r
+\r
+ .org 0x01fe\r
+ .word 0xaa55\r
+\r
+#******************************************************************************\r
+#******************************************************************************\r
+#******************************************************************************\r
+\r
+.equ DELAY_PORT, 0x0ed # Port to use for 1uS delay\r
+.equ KBD_CONTROL_PORT, 0x060 # 8042 control port \r
+.equ KBD_STATUS_PORT, 0x064 # 8042 status port \r
+.equ WRITE_DATA_PORT_CMD, 0x0d1 # 8042 command to write the data port\r
+.equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20\r
+\r
+ .org 0x200\r
+ jmp start\r
+Em64String: \r
+.byte 'E', 0x0c, 'm', 0x0c, '6', 0x0c, '4', 0x0c, 'T', 0x0c, ' ', 0x0c, 'U', 0x0c, 'n', 0x0c, 's', 0x0c, 'u', 0x0c, 'p', 0x0c, 'p', 0x0c, 'o', 0x0c, 'r', 0x0c, 't', 0x0c, 'e', 0x0c, 'd', 0x0c, '!', 0x0c\r
+\r
+start: \r
+ movw %cs,%ax\r
+ movw %ax,%ds\r
+ movw %ax,%es\r
+ movw %ax,%ss\r
+ movw $MyStack, %sp\r
+\r
+# mov ax,0b800h\r
+# mov es,ax\r
+# mov byte ptr es:[160],'a'\r
+# mov ax,cs\r
+# mov es,ax\r
+\r
+ movl $0,%ebx\r
+ leal MemoryMap, %edi\r
+MemMapLoop: \r
+ movl $0xe820,%eax\r
+ movl $20,%ecx\r
+ movl $0x534d4150, %edx # SMAP\r
+ int $0x15\r
+ jc MemMapDone\r
+ addl $20,%edi\r
+ cmpl $0,%ebx\r
+ je MemMapDone\r
+ jmp MemMapLoop\r
+MemMapDone: \r
+ leal MemoryMap, %eax\r
+ subl %eax,%edi # Get the address of the memory map\r
+ movl %edi, MemoryMapSize # Save the size of the memory map\r
+\r
+ xorl %ebx,%ebx\r
+ movw %cs,%bx # BX=segment\r
+ shll $4,%ebx # BX="linear" address of segment base\r
leal GDT_BASE(%ebx), %eax # EAX=PHYSICAL address of gdt\r
movl %eax, (gdtr + 2) # Put address of gdt into the gdtr\r
leal IDT_BASE(%ebx), %eax # EAX=PHYSICAL address of idt\r
movl %eax, (idtr + 2) # Put address of idt into the idtr\r
- leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map
-
-# mov ax,0b800h
-# mov es,ax
-# mov byte ptr es:[162],'b'
-# mov ax,cs
-# mov es,ax
-
-#
-# Enable A20 Gate
-#
-
- movw $0x2401,%ax # Enable A20 Gate
- int $0x15
- jnc A20GateEnabled # Jump if it suceeded
-
-#
-# If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually.
-#
-
- call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
- jnz Timeout8042 # Jump if the 8042 timed out
- outw %ax, $DELAY_PORT # Delay 1 uS
- movb $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port
- outb %al, $KBD_STATUS_PORT # Send command to the 8042
- call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
- jnz Timeout8042 # Jump if the 8042 timed out
- movb $ENABLE_A20_CMD, %al # gate address bit 20 on
- outb %al, $KBD_CONTROL_PORT # Send command to thre 8042
- call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
- movw $25,%cx # Delay 25 uS for the command to complete on the 8042
-Delay25uS:
- outw %ax, $DELAY_PORT # Delay 1 uS
- loop Delay25uS
-Timeout8042:
-
-
-A20GateEnabled:
-
-#
-# DISABLE INTERRUPTS - Entering Protected Mode
-#
-
- cli
-
-# mov ax,0b800h
-# mov es,ax
-# mov byte ptr es:[164],'c'
-# mov ax,cs
-# mov es,ax
-
- leal OffsetIn32BitProtectedMode, %eax
- addl $0x20000+0x6,%eax
- movl %eax, OffsetIn32BitProtectedMode
-
- leal OffsetInLongMode, %eax
- addl $0x20000+0x6,%eax
- movl %eax, OffsetInLongMode
-
- #
- # load GDT
- #
- .byte 0x66
- lgdt gdtr
-
- #
- # Enable Protect Mode (set CR0.PE=1)
- #
- movl $cr0, %eax # Read CR0.
- orl $0x1,%eax # Set PE=1
- movl %eax, %cr0 # Write CR0.
- .byte 0x66
- .byte 0xea # jmp far 16:32
-OffsetIn32BitProtectedMode:
- .long 0x0000000 # offset $+8 (In32BitProtectedMode)
- .word 0x10 # selector (flat CS)
-In32BitProtectedMode:
-
-#
-# Entering Long Mode
-#
- .byte 0x66
- movw $8,%ax
- movw %ax,%ds
- movw %ax,%es
- movw %ax,%ss
-
- #
- # Enable the 64-bit page-translation-table entries by
- # setting CR4.PAE=1 (this is _required_ before activating
- # long mode). Paging is not enabled until after long mode
- # is enabled.
- #
- .byte 0xf
- .byte 0x20
- .byte 0xe0
-# mov eax, cr4
- btsl $5,%eax
- .byte 0xf
- .byte 0x22
- .byte 0xe0
-# mov cr4, eax
-
- #
- # This is the Trapolean Page Tables that are guarenteed
- # under 4GB.
- #
- # Address Map:
- # 10000 ~ 12000 - efildr (loaded)
- # 20000 ~ 21000 - start64.com
- # 21000 ~ 22000 - efi64.com
- # 22000 ~ 90000 - efildr
- # 90000 ~ 96000 - 4G pagetable (will be reload later)
- #
- .byte 0xb8
- .long 0x90000
-# mov eax, 90000h
- movl %eax, %cr3
-
- #
- # Enable long mode (set EFER.LME=1).
- #
- .byte 0xb9
- .long 0xc0000080
-# mov ecx, 0c0000080h ; EFER MSR number.
- .byte 0xf
- .byte 0x32
-# rdmsr ; Read EFER.
- .byte 0xf
- .byte 0xba
- .byte 0xe8
- .byte 0x8
-# bts eax, 8 ; Set LME=1.
- .byte 0xf
- .byte 0x30
-# wrmsr ; Write EFER.
-
- #
- # Enable paging to activate long mode (set CR0.PG=1)
- #
- movl $cr0, %eax # Read CR0.
- .byte 0xf
- .byte 0xba
- .byte 0xe8
- .byte 0x1f
-# bts eax, 31 ; Set PG=1.
- movl %eax, %cr0 # Write CR0.
- jmp GoToLongMode
-GoToLongMode:
-
- .byte 0x67
- .byte 0xea # Far Jump $+9:Selector to reload CS
-OffsetInLongMode:
- .long 00000000 # $+9 Offset is ensuing instruction boundary
- .word 0x38 # Selector is our code selector, 38h
-
-InLongMode:
- .byte 0x66
- movw $0x30,%ax
- movw %ax,%ds
-
- .byte 0x66
- movw $0x18,%ax
- movw %ax,%es
- movw %ax,%ss
- movw %ax,%ds
-
- .byte 0xbd
- .long 0x400000
-# mov ebp,000400000h ; Destination of EFILDR32
- .byte 0xbb
- .long 0x70000
-# mov ebx,000070000h ; Length of copy
-
- #
- # load idt later
- #
- .byte 0x48
- .byte 0x33
- .byte 0xc0
-# xor rax, rax
- .byte 0x66
- movw $idtr, %ax
- .byte 0x48
- .byte 0x5
- .long 0x20000
-# add rax, 20000h
-
- .byte 0xf
- .byte 0x1
- .byte 0x18
-# lidt fword ptr [rax]
-
- .byte 0x48
- .byte 0xc7
- .byte 0xc0
- .long 0x21000
-# mov rax, 21000h
- .byte 0x50
-# push rax
-
-# ret
- .byte 0xc3
-
-Empty8042InputBuffer:
- movw $0,%cx
-Empty8042Loop:
- outw %ax, $DELAY_PORT # Delay 1us
- inb $KBD_STATUS_PORT, %al # Read the 8042 Status Port
- andb $0x2,%al # Check the Input Buffer Full Flag
- loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS
- ret
-
-##############################################################################
-# data
-##############################################################################
-
- .align 0x2
-
- gdtr: .long GDT_END - GDT_BASE - 1 # GDT limit
- .long 0 # (GDT base gets set above)
-##############################################################################
-# global descriptor table (GDT)
-##############################################################################
-
- .align 0x2
-
-GDT_BASE:
-# null descriptor
-.equ NULL_SEL, .-GDT_BASE # Selector [0x0]
- .word 0 # limit 15:0
- .word 0 # base 15:0
- .byte 0 # base 23:16
- .byte 0 # type
- .byte 0 # limit 19:16, flags
- .byte 0 # base 31:24
-
-# linear data segment descriptor
-.equ LINEAR_SEL, .-GDT_BASE # Selector [0x8]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x92 # present, ring 0, data, expand-up, writable
- .byte 0xCF # page-granular, 32-bit
- .byte 0
-
-# linear code segment descriptor
-.equ LINEAR_CODE_SEL, .-GDT_BASE # Selector [0x10]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x9A # present, ring 0, data, expand-up, writable
- .byte 0xCF # page-granular, 32-bit
- .byte 0
-
-# system data segment descriptor
-.equ SYS_DATA_SEL, .-GDT_BASE # Selector [0x18]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x92 # present, ring 0, data, expand-up, writable
- .byte 0xCF # page-granular, 32-bit
- .byte 0
-
-# system code segment descriptor
-.equ SYS_CODE_SEL, .-GDT_BASE # Selector [0x20]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x9A # present, ring 0, data, expand-up, writable
- .byte 0xCF # page-granular, 32-bit
- .byte 0
-
-# spare segment descriptor
-.equ SPARE3_SEL, .-GDT_BASE # Selector [0x28]
- .word 0 # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0 # present, ring 0, data, expand-up, writable
- .byte 0 # page-granular, 32-bit
- .byte 0
-
-#
-# system data segment descriptor
-#
-.equ SYS_DATA64_SEL, .-GDT_BASE # Selector [0x30]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x92 # P | DPL [1..2] | 1 | 1 | C | R | A
- .byte 0xCF # G | D | L | AVL | Segment [19..16]
- .byte 0
-
-#
-# system code segment descriptor
-#
-.equ SYS_CODE64_SEL, .-GDT_BASE # Selector [0x38]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x9A # P | DPL [1..2] | 1 | 1 | C | R | A
- .byte 0xAF # G | D | L | AVL | Segment [19..16]
- .byte 0
-
-# spare segment descriptor
-.equ SPARE4_SEL, .-GDT_BASE # Selector [0x40]
- .word 0 # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0 # present, ring 0, data, expand-up, writable
- .byte 0 # page-granular, 32-bit
- .byte 0
-
-GDT_END:
-
- .align 0x2
-
-
-
-idtr: .long IDT_END - IDT_BASE - 1 # IDT limit
- .quad 0 # (IDT base gets set above)
-
-##############################################################################
-# interrupt descriptor table (IDT)
-#
-# Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ
-# mappings. This implementation only uses the system timer and all other
-# IRQs will remain masked. The descriptors for vectors 33+ are provided
-# for convenience.
-##############################################################################
-
-#idt_tag db "IDT",0
- .align 0x2
-
-
-IDT_BASE:
-# divide by zero (INT 0)
-.equ DIV_ZERO_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# debug exception (INT 1)
-.equ DEBUG_EXCEPT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# NMI (INT 2)
-.equ NMI_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# soft breakpoint (INT 3)
-.equ BREAKPOINT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# overflow (INT 4)
-.equ OVERFLOW_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# bounds check (INT 5)
-.equ BOUNDS_CHECK_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# invalid opcode (INT 6)
-.equ INVALID_OPCODE_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# device not available (INT 7)
-.equ DEV_NOT_AVAIL_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# double fault (INT 8)
-.equ DOUBLE_FAULT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# Coprocessor segment overrun - reserved (INT 9)
-.equ RSVD_INTR_SEL1, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# invalid TSS (INT 0ah)
-.equ INVALID_TSS_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# segment not present (INT 0bh)
-.equ SEG_NOT_PRESENT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# stack fault (INT 0ch)
-.equ STACK_FAULT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# general protection (INT 0dh)
-.equ GP_FAULT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# page fault (INT 0eh)
-.equ PAGE_FAULT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# Intel reserved - do not use (INT 0fh)
-.equ RSVD_INTR_SEL2, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# floating point error (INT 10h)
-.equ FLT_POINT_ERR_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# alignment check (INT 11h)
-.equ ALIGNMENT_CHECK_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# machine check (INT 12h)
-.equ MACHINE_CHECK_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# SIMD floating-point exception (INT 13h)
-.equ SIMD_EXCEPTION_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# 85 unspecified descriptors, First 12 of them are reserved, the rest are avail
- .fill 85 * 16, 1, 0 # db (85 * 16) dup(0)
-
-# IRQ 0 (System timer) - (INT 68h)
-.equ IRQ0_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 1 (8042 Keyboard controller) - (INT 69h)
-.equ IRQ1_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah)
-.equ IRQ2_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 3 (COM 2) - (INT 6bh)
-.equ IRQ3_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 4 (COM 1) - (INT 6ch)
-.equ IRQ4_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 5 (LPT 2) - (INT 6dh)
-.equ IRQ5_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 6 (Floppy controller) - (INT 6eh)
-.equ IRQ6_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 7 (LPT 1) - (INT 6fh)
-.equ IRQ7_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 8 (RTC Alarm) - (INT 70h)
-.equ IRQ8_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 9 - (INT 71h)
-.equ IRQ9_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 10 - (INT 72h)
-.equ IRQ10_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 11 - (INT 73h)
-.equ IRQ11_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 12 (PS/2 mouse) - (INT 74h)
-.equ IRQ12_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 13 (Floating point error) - (INT 75h)
-.equ IRQ13_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 14 (Secondary IDE) - (INT 76h)
-.equ IRQ14_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 15 (Primary IDE) - (INT 77h)
-.equ IRQ15_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-IDT_END:
-
- .align 0x2
-
-MemoryMapSize: .long 0
-MemoryMap: .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
-
- .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
-
- #.org 0x0fe0 #Just for pass build
-MyStack:
- # below is the pieces of the IVT that is used to redirect INT 68h - 6fh
- # back to INT 08h - 0fh when in real mode... It is 'org'ed to a
- # known low address (20f00) so it can be set up by PlMapIrqToVect in
- # 8259.c
-
- int $8
- iret
-
- int $9
- iret
-
- int $10
- iret
-
- int $11
- iret
-
- int $12
- iret
-
- int $13
- iret
-
- int $14
- iret
-
- int $15
- iret
-
-
- #.org 0x0ffe #Just for pass build
-BlockSignature:
- .word 0xaa55
-
+ leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map\r
+\r
+# mov ax,0b800h\r
+# mov es,ax\r
+# mov byte ptr es:[162],'b'\r
+# mov ax,cs\r
+# mov es,ax\r
+\r
+#\r
+# Enable A20 Gate \r
+#\r
+\r
+ movw $0x2401,%ax # Enable A20 Gate\r
+ int $0x15\r
+ jnc A20GateEnabled # Jump if it suceeded\r
+\r
+#\r
+# If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually.\r
+#\r
+\r
+ call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r
+ jnz Timeout8042 # Jump if the 8042 timed out\r
+ outw %ax, $DELAY_PORT # Delay 1 uS\r
+ movb $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port\r
+ outb %al, $KBD_STATUS_PORT # Send command to the 8042\r
+ call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r
+ jnz Timeout8042 # Jump if the 8042 timed out\r
+ movb $ENABLE_A20_CMD, %al # gate address bit 20 on\r
+ outb %al, $KBD_CONTROL_PORT # Send command to thre 8042\r
+ call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r
+ movw $25,%cx # Delay 25 uS for the command to complete on the 8042\r
+Delay25uS: \r
+ outw %ax, $DELAY_PORT # Delay 1 uS\r
+ loop Delay25uS\r
+Timeout8042: \r
+\r
+\r
+A20GateEnabled: \r
+\r
+#\r
+# DISABLE INTERRUPTS - Entering Protected Mode\r
+#\r
+\r
+ cli\r
+\r
+# mov ax,0b800h\r
+# mov es,ax\r
+# mov byte ptr es:[164],'c'\r
+# mov ax,cs\r
+# mov es,ax\r
+\r
+ leal OffsetIn32BitProtectedMode, %eax\r
+ addl $0x20000+0x6,%eax\r
+ movl %eax, OffsetIn32BitProtectedMode \r
+\r
+ leal OffsetInLongMode, %eax\r
+ addl $0x20000+0x6,%eax\r
+ movl %eax, OffsetInLongMode \r
+\r
+ #\r
+ # load GDT\r
+ #\r
+ .byte 0x66\r
+ lgdt gdtr\r
+\r
+ #\r
+ # Enable Protect Mode (set CR0.PE=1)\r
+ #\r
+ movl $cr0, %eax # Read CR0.\r
+ orl $0x1,%eax # Set PE=1\r
+ movl %eax, %cr0 # Write CR0.\r
+ .byte 0x66\r
+ .byte 0xea # jmp far 16:32\r
+OffsetIn32BitProtectedMode: \r
+ .long 0x0000000 # offset $+8 (In32BitProtectedMode)\r
+ .word 0x10 # selector (flat CS)\r
+In32BitProtectedMode: \r
+\r
+#\r
+# Entering Long Mode\r
+#\r
+ .byte 0x66\r
+ movw $8,%ax\r
+ movw %ax,%ds\r
+ movw %ax,%es\r
+ movw %ax,%ss\r
+\r
+ #\r
+ # Enable the 64-bit page-translation-table entries by\r
+ # setting CR4.PAE=1 (this is _required_ before activating\r
+ # long mode). Paging is not enabled until after long mode\r
+ # is enabled.\r
+ #\r
+ .byte 0xf\r
+ .byte 0x20\r
+ .byte 0xe0\r
+# mov eax, cr4\r
+ btsl $5,%eax\r
+ .byte 0xf\r
+ .byte 0x22\r
+ .byte 0xe0\r
+# mov cr4, eax\r
+\r
+ #\r
+ # This is the Trapolean Page Tables that are guarenteed\r
+ # under 4GB.\r
+ #\r
+ # Address Map:\r
+ # 10000 ~ 12000 - efildr (loaded)\r
+ # 20000 ~ 21000 - start64.com\r
+ # 21000 ~ 22000 - efi64.com\r
+ # 22000 ~ 90000 - efildr\r
+ # 90000 ~ 96000 - 4G pagetable (will be reload later)\r
+ #\r
+ .byte 0xb8\r
+ .long 0x90000\r
+# mov eax, 90000h\r
+ movl %eax, %cr3\r
+\r
+ #\r
+ # Enable long mode (set EFER.LME=1).\r
+ #\r
+ .byte 0xb9\r
+ .long 0xc0000080\r
+# mov ecx, 0c0000080h ; EFER MSR number.\r
+ .byte 0xf\r
+ .byte 0x32\r
+# rdmsr ; Read EFER.\r
+ .byte 0xf\r
+ .byte 0xba\r
+ .byte 0xe8\r
+ .byte 0x8\r
+# bts eax, 8 ; Set LME=1.\r
+ .byte 0xf\r
+ .byte 0x30\r
+# wrmsr ; Write EFER.\r
+\r
+ #\r
+ # Enable paging to activate long mode (set CR0.PG=1)\r
+ #\r
+ movl $cr0, %eax # Read CR0.\r
+ .byte 0xf\r
+ .byte 0xba\r
+ .byte 0xe8\r
+ .byte 0x1f\r
+# bts eax, 31 ; Set PG=1.\r
+ movl %eax, %cr0 # Write CR0.\r
+ jmp GoToLongMode\r
+GoToLongMode: \r
+\r
+ .byte 0x67\r
+ .byte 0xea # Far Jump $+9:Selector to reload CS\r
+OffsetInLongMode: \r
+ .long 00000000 # $+9 Offset is ensuing instruction boundary\r
+ .word 0x38 # Selector is our code selector, 38h\r
+\r
+InLongMode: \r
+ .byte 0x66\r
+ movw $0x30,%ax\r
+ movw %ax,%ds\r
+\r
+ .byte 0x66\r
+ movw $0x18,%ax\r
+ movw %ax,%es\r
+ movw %ax,%ss\r
+ movw %ax,%ds\r
+\r
+ .byte 0xbd\r
+ .long 0x400000\r
+# mov ebp,000400000h ; Destination of EFILDR32\r
+ .byte 0xbb\r
+ .long 0x70000\r
+# mov ebx,000070000h ; Length of copy\r
+\r
+ #\r
+ # load idt later\r
+ #\r
+ .byte 0x48\r
+ .byte 0x33\r
+ .byte 0xc0\r
+# xor rax, rax\r
+ .byte 0x66\r
+ movw $idtr, %ax\r
+ .byte 0x48\r
+ .byte 0x5\r
+ .long 0x20000\r
+# add rax, 20000h\r
+\r
+ .byte 0xf\r
+ .byte 0x1\r
+ .byte 0x18\r
+# lidt fword ptr [rax]\r
+\r
+ .byte 0x48\r
+ .byte 0xc7\r
+ .byte 0xc0\r
+ .long 0x21000\r
+# mov rax, 21000h\r
+ .byte 0x50\r
+# push rax\r
+\r
+# ret\r
+ .byte 0xc3\r
+\r
+Empty8042InputBuffer: \r
+ movw $0,%cx\r
+Empty8042Loop: \r
+ outw %ax, $DELAY_PORT # Delay 1us\r
+ inb $KBD_STATUS_PORT, %al # Read the 8042 Status Port\r
+ andb $0x2,%al # Check the Input Buffer Full Flag\r
+ loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS\r
+ ret\r
+\r
+##############################################################################\r
+# data\r
+##############################################################################\r
+\r
+ .align 0x2\r
+\r
+ gdtr: .long GDT_END - GDT_BASE - 1 # GDT limit \r
+ .long 0 # (GDT base gets set above)\r
+##############################################################################\r
+# global descriptor table (GDT)\r
+##############################################################################\r
+\r
+ .align 0x2\r
+\r
+GDT_BASE: \r
+# null descriptor\r
+.equ NULL_SEL, .-GDT_BASE # Selector [0x0]\r
+ .word 0 # limit 15:0\r
+ .word 0 # base 15:0\r
+ .byte 0 # base 23:16\r
+ .byte 0 # type\r
+ .byte 0 # limit 19:16, flags\r
+ .byte 0 # base 31:24\r
+\r
+# linear data segment descriptor\r
+.equ LINEAR_SEL, .-GDT_BASE # Selector [0x8]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x92 # present, ring 0, data, expand-up, writable\r
+ .byte 0xCF # page-granular, 32-bit\r
+ .byte 0\r
+\r
+# linear code segment descriptor\r
+.equ LINEAR_CODE_SEL, .-GDT_BASE # Selector [0x10]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x9A # present, ring 0, data, expand-up, writable\r
+ .byte 0xCF # page-granular, 32-bit\r
+ .byte 0\r
+\r
+# system data segment descriptor\r
+.equ SYS_DATA_SEL, .-GDT_BASE # Selector [0x18]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x92 # present, ring 0, data, expand-up, writable\r
+ .byte 0xCF # page-granular, 32-bit\r
+ .byte 0\r
+\r
+# system code segment descriptor\r
+.equ SYS_CODE_SEL, .-GDT_BASE # Selector [0x20]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x9A # present, ring 0, data, expand-up, writable\r
+ .byte 0xCF # page-granular, 32-bit\r
+ .byte 0\r
+\r
+# spare segment descriptor\r
+.equ SPARE3_SEL, .-GDT_BASE # Selector [0x28]\r
+ .word 0 # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0 # present, ring 0, data, expand-up, writable\r
+ .byte 0 # page-granular, 32-bit\r
+ .byte 0\r
+\r
+#\r
+# system data segment descriptor\r
+#\r
+.equ SYS_DATA64_SEL, .-GDT_BASE # Selector [0x30]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x92 # P | DPL [1..2] | 1 | 1 | C | R | A\r
+ .byte 0xCF # G | D | L | AVL | Segment [19..16]\r
+ .byte 0\r
+\r
+#\r
+# system code segment descriptor\r
+#\r
+.equ SYS_CODE64_SEL, .-GDT_BASE # Selector [0x38]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x9A # P | DPL [1..2] | 1 | 1 | C | R | A\r
+ .byte 0xAF # G | D | L | AVL | Segment [19..16]\r
+ .byte 0\r
+\r
+# spare segment descriptor\r
+.equ SPARE4_SEL, .-GDT_BASE # Selector [0x40]\r
+ .word 0 # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0 # present, ring 0, data, expand-up, writable\r
+ .byte 0 # page-granular, 32-bit\r
+ .byte 0\r
+\r
+GDT_END: \r
+\r
+ .align 0x2\r
+\r
+\r
+\r
+idtr: .long IDT_END - IDT_BASE - 1 # IDT limit\r
+ .quad 0 # (IDT base gets set above)\r
+\r
+##############################################################################\r
+# interrupt descriptor table (IDT)\r
+#\r
+# Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ\r
+# mappings. This implementation only uses the system timer and all other\r
+# IRQs will remain masked. The descriptors for vectors 33+ are provided\r
+# for convenience.\r
+##############################################################################\r
+\r
+#idt_tag db "IDT",0 \r
+ .align 0x2\r
+\r
+\r
+IDT_BASE: \r
+# divide by zero (INT 0)\r
+.equ DIV_ZERO_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# debug exception (INT 1)\r
+.equ DEBUG_EXCEPT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# NMI (INT 2)\r
+.equ NMI_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# soft breakpoint (INT 3)\r
+.equ BREAKPOINT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# overflow (INT 4)\r
+.equ OVERFLOW_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# bounds check (INT 5)\r
+.equ BOUNDS_CHECK_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# invalid opcode (INT 6)\r
+.equ INVALID_OPCODE_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# device not available (INT 7)\r
+.equ DEV_NOT_AVAIL_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# double fault (INT 8)\r
+.equ DOUBLE_FAULT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# Coprocessor segment overrun - reserved (INT 9)\r
+.equ RSVD_INTR_SEL1, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# invalid TSS (INT 0ah)\r
+.equ INVALID_TSS_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# segment not present (INT 0bh)\r
+.equ SEG_NOT_PRESENT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# stack fault (INT 0ch)\r
+.equ STACK_FAULT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# general protection (INT 0dh)\r
+.equ GP_FAULT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# page fault (INT 0eh)\r
+.equ PAGE_FAULT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# Intel reserved - do not use (INT 0fh)\r
+.equ RSVD_INTR_SEL2, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# floating point error (INT 10h)\r
+.equ FLT_POINT_ERR_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# alignment check (INT 11h)\r
+.equ ALIGNMENT_CHECK_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# machine check (INT 12h)\r
+.equ MACHINE_CHECK_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# SIMD floating-point exception (INT 13h)\r
+.equ SIMD_EXCEPTION_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# 85 unspecified descriptors, First 12 of them are reserved, the rest are avail\r
+ .fill 85 * 16, 1, 0 # db (85 * 16) dup(0)\r
+\r
+# IRQ 0 (System timer) - (INT 68h)\r
+.equ IRQ0_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 1 (8042 Keyboard controller) - (INT 69h)\r
+.equ IRQ1_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah)\r
+.equ IRQ2_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 3 (COM 2) - (INT 6bh)\r
+.equ IRQ3_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 4 (COM 1) - (INT 6ch)\r
+.equ IRQ4_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 5 (LPT 2) - (INT 6dh)\r
+.equ IRQ5_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 6 (Floppy controller) - (INT 6eh)\r
+.equ IRQ6_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 7 (LPT 1) - (INT 6fh)\r
+.equ IRQ7_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 8 (RTC Alarm) - (INT 70h)\r
+.equ IRQ8_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 9 - (INT 71h)\r
+.equ IRQ9_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 10 - (INT 72h)\r
+.equ IRQ10_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 11 - (INT 73h)\r
+.equ IRQ11_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 12 (PS/2 mouse) - (INT 74h)\r
+.equ IRQ12_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 13 (Floating point error) - (INT 75h)\r
+.equ IRQ13_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 14 (Secondary IDE) - (INT 76h)\r
+.equ IRQ14_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 15 (Primary IDE) - (INT 77h)\r
+.equ IRQ15_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+IDT_END: \r
+\r
+ .align 0x2\r
+\r
+MemoryMapSize: .long 0\r
+MemoryMap: .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+\r
+ .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0\r
+\r
+ #.org 0x0fe0 #Just for pass build\r
+MyStack: \r
+ # below is the pieces of the IVT that is used to redirect INT 68h - 6fh\r
+ # back to INT 08h - 0fh when in real mode... It is 'org'ed to a\r
+ # known low address (20f00) so it can be set up by PlMapIrqToVect in\r
+ # 8259.c\r
+\r
+ int $8\r
+ iret\r
+\r
+ int $9\r
+ iret\r
+\r
+ int $10\r
+ iret\r
+\r
+ int $11\r
+ iret\r
+\r
+ int $12\r
+ iret\r
+\r
+ int $13\r
+ iret\r
+\r
+ int $14\r
+ iret\r
+\r
+ int $15\r
+ iret\r
+\r
+\r
+ #.org 0x0ffe #Just for pass build\r
+BlockSignature: \r
+ .word 0xaa55\r
+\r
-#------------------------------------------------------------------------------
-#*
-#* Copyright 2006 - 2007, Intel Corporation
-#* All rights reserved. This program and the accompanying materials
-#* are licensed and made available under the terms and conditions of the BSD License
-#* which accompanies this distribution. The full text of the license may be found at
-#* http://opensource.org/licenses/bsd-license.php
-#*
-#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
-#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
-#*
-#* st32_64.asm
-#*
-#* Abstract:
-#*
-#------------------------------------------------------------------------------
-
-
- .stack:
- .486p:
- .code16
-
+#------------------------------------------------------------------------------\r
+#*\r
+#* Copyright 2006 - 2007, Intel Corporation \r
+#* All rights reserved. This program and the accompanying materials \r
+#* are licensed and made available under the terms and conditions of the BSD License \r
+#* which accompanies this distribution. The full text of the license may be found at \r
+#* http://opensource.org/licenses/bsd-license.php \r
+#* \r
+#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r
+#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r
+#* \r
+#* st32_64.asm\r
+#* \r
+#* Abstract:\r
+#*\r
+#------------------------------------------------------------------------------\r
+\r
+\r
+ .stack: \r
+ .486p: \r
+ .code16\r
+\r
.equ FAT_DIRECTORY_ENTRY_SIZE, 0x020\r
.equ FAT_DIRECTORY_ENTRY_SHIFT, 5\r
.equ BLOCK_SIZE, 0x0200\r
.equ BLOCK_MASK, 0x01ff\r
-.equ BLOCK_SHIFT, 9
-
- .org 0x0
-Ia32Jump:
- jmp BootSectorEntryPoint # JMP inst - 3 bytes
- nop
-
+.equ BLOCK_SHIFT, 9\r
+\r
+ .org 0x0\r
+Ia32Jump: \r
+ jmp BootSectorEntryPoint # JMP inst - 3 bytes\r
+ nop\r
+\r
OemId: .ascii "INTEL " # OemId - 8 bytes\r
SectorSize: .word 0 # Sector Size - 2 bytes\r
SectorsPerCluster: .byte 0 # Sector Per Cluster - 1 byte\r
FatLabel: .ascii " " # Volume Label - 11 bytes\r
FileSystemType: .ascii "FAT32 " # File System Type - 8 bytes\r
\r
-
-BootSectorEntryPoint:
- # ASSUME ds:@code
- # ASSUME ss:@code
- # ds = 1000, es = 2000 + x (size of first cluster >> 4)
- # cx = Start Cluster of EfiLdr
- # dx = Start Cluster of Efivar.bin
-
-# Re use the BPB data stored in Boot Sector
- movw $0x7c00,%bp
-
- pushw %cx
-# Read Efivar.bin
-# 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already
- movw $0x1900,%ax
- movw %ax,%es
- testw %dx,%dx
- jnz CheckVarStoreSize
-
- movb $1,%al
-NoVarStore:
- pushw %es
-# Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl
- movb %al, %es:(4)
- jmp SaveVolumeId
-
-CheckVarStoreSize:
- movw %dx,%di
- cmpl $0x4000, %ds:2(%di)
- movb $2,%al
- jne NoVarStore
-
-LoadVarStore:
- movb $0,%al
+\r
+BootSectorEntryPoint: \r
+ # ASSUME ds:@code\r
+ # ASSUME ss:@code\r
+ # ds = 1000, es = 2000 + x (size of first cluster >> 4)\r
+ # cx = Start Cluster of EfiLdr\r
+ # dx = Start Cluster of Efivar.bin\r
+\r
+# Re use the BPB data stored in Boot Sector\r
+ movw $0x7c00,%bp\r
+\r
+ pushw %cx\r
+# Read Efivar.bin\r
+# 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already\r
+ movw $0x1900,%ax\r
+ movw %ax,%es\r
+ testw %dx,%dx\r
+ jnz CheckVarStoreSize\r
+\r
+ movb $1,%al\r
+NoVarStore: \r
+ pushw %es\r
+# Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl\r
+ movb %al, %es:(4)\r
+ jmp SaveVolumeId\r
+\r
+CheckVarStoreSize: \r
+ movw %dx,%di\r
+ cmpl $0x4000, %ds:2(%di)\r
+ movb $2,%al\r
+ jne NoVarStore\r
+\r
+LoadVarStore: \r
+ movb $0,%al\r
movb %al, %es:(4)\r
- movw (%di), %cx
-# ES:DI = 1500:0
- xorw %di,%di
- pushw %es
- movw $0x1500,%ax
- movw %ax,%es
- call ReadFile
-SaveVolumeId:
- popw %es
+ movw (%di), %cx\r
+# ES:DI = 1500:0\r
+ xorw %di,%di\r
+ pushw %es\r
+ movw $0x1500,%ax\r
+ movw %ax,%es\r
+ call ReadFile\r
+SaveVolumeId: \r
+ popw %es\r
movw VolId(%bp), %ax\r
movw %ax, %es:(0) # Save Volume Id to 0:19000. we will find the correct volume according to this VolumeId\r
movw VolId+2(%bp), %ax\r
- movw %ax, %es:(2)
-
-# Read Efildr
- popw %cx
-# cx = Start Cluster of Efildr -> BS.com has filled already
-# ES:DI = 2000:0, first cluster will be read again
- xorw %di,%di # di = 0
- movw $0x2000,%ax
- movw %ax,%es
- call ReadFile
- movw %cs,%ax
- movw %ax, %cs:JumpSegment
-
-CheckEm64T:
- movl $0x80000001,%eax
-# cpuid
- .word 0xA20F
- btl $29,%edx
- jc CheckEm64TPass
- pushw %cs
- popw %ds
- leaw Em64String,%si
- movw $18,%cx
- jmp PrintStringAndHalt
-CheckEm64TPass:
-jumpFarInstruction:
- .byte 0xea
-jumpOffset:
- .word 0x200
-jumpSegment:
- .word 0x2000
-
-
-
-# ****************************************************************************
-# ReadFile
-#
-# Arguments:
-# CX = Start Cluster of File
-# ES:DI = Buffer to store file content read from disk
-#
-# Return:
-# (ES << 4 + DI) = end of file content Buffer
-#
-# ****************************************************************************
-ReadFile:
-# si = NumberOfClusters
-# cx = ClusterNumber
-# dx = CachedFatSectorNumber
-# ds:0000 = CacheFatSectorBuffer
-# es:di = Buffer to load file
-# bx = NextClusterNumber
- pusha
- movw $1,%si # NumberOfClusters = 1
- pushw %cx # Push Start Cluster onto stack
- movw $0xfff,%dx # CachedFatSectorNumber = 0xfff
-FatChainLoop:
- movw %cx,%ax # ax = ClusterNumber
- andw $0xfff8,%ax # ax = ax & 0xfff8
- cmpw $0xfff8,%ax # See if this is the last cluster
- je FoundLastCluster # Jump if last cluster found
- movw %cx,%ax # ax = ClusterNumber
- shlw $2, %ax # FatOffset = ClusterNumber * 2
- pushw %si # Save si
- movw %ax,%si # si = FatOffset
- shrw $BLOCK_SHIFT, %ax # ax = FatOffset >> BLOCK_SHIFT
- addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET)
- andw $BLOCK_MASK, %si # si = FatOffset & BLOCK_MASK
- cmpw %dx,%ax # Compare FatSectorNumber to CachedFatSectorNumber
- je SkipFatRead
- movw $2,%bx
- pushw %es
- pushw %ds
- popw %es
- call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI
- popw %es
- movw %ax,%dx # CachedFatSectorNumber = FatSectorNumber
-SkipFatRead:
- movw (%si), %bx # bx = NextClusterNumber
- movw %cx,%ax # ax = ClusterNumber
- popw %si # Restore si
- decw %bx # bx = NextClusterNumber - 1
- cmpw %cx,%bx # See if (NextClusterNumber-1)==ClusterNumber
- jne ReadClusters
- incw %bx # bx = NextClusterNumber
- incw %si # NumberOfClusters++
- movw %bx,%cx # ClusterNumber = NextClusterNumber
- jmp FatChainLoop
-ReadClusters:
- incw %bx
- popw %ax # ax = StartCluster
- pushw %bx # StartCluster = NextClusterNumber
- movw %bx,%cx # ClusterNumber = NextClusterNumber
- subw $2,%ax # ax = StartCluster - 2
- xorb %bh,%bh
- movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster
- mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster
- addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster
- pushw %ax # save start sector
- movw %si,%ax # ax = NumberOfClusters
- mulw %bx # ax = NumberOfClusters * SectorsPerCluster
- movw %ax,%bx # bx = Number of Sectors
- popw %ax # ax = Start Sector
- call ReadBlocks
- movw $1,%si # NumberOfClusters = 1
- jmp FatChainLoop
-FoundLastCluster:
- popw %cx
- popa
- ret
-
-
-# ****************************************************************************
-# ReadBlocks - Reads a set of blocks from a block device
-#
-# AX = Start LBA
-# BX = Number of Blocks to Read
-# ES:DI = Buffer to store sectors read from disk
-# ****************************************************************************
-
-# cx = Blocks
-# bx = NumberOfBlocks
-# si = StartLBA
-
-ReadBlocks:
- pusha
+ movw %ax, %es:(2)\r
+\r
+# Read Efildr\r
+ popw %cx\r
+# cx = Start Cluster of Efildr -> BS.com has filled already\r
+# ES:DI = 2000:0, first cluster will be read again\r
+ xorw %di,%di # di = 0\r
+ movw $0x2000,%ax\r
+ movw %ax,%es\r
+ call ReadFile\r
+ movw %cs,%ax\r
+ movw %ax, %cs:JumpSegment\r
+\r
+CheckEm64T: \r
+ movl $0x80000001,%eax\r
+# cpuid\r
+ .word 0xA20F\r
+ btl $29,%edx\r
+ jc CheckEm64TPass\r
+ pushw %cs\r
+ popw %ds\r
+ leaw Em64String,%si\r
+ movw $18,%cx\r
+ jmp PrintStringAndHalt\r
+CheckEm64TPass: \r
+jumpFarInstruction: \r
+ .byte 0xea\r
+jumpOffset: \r
+ .word 0x200\r
+jumpSegment: \r
+ .word 0x2000\r
+\r
+\r
+\r
+# ****************************************************************************\r
+# ReadFile\r
+#\r
+# Arguments:\r
+# CX = Start Cluster of File\r
+# ES:DI = Buffer to store file content read from disk\r
+#\r
+# Return:\r
+# (ES << 4 + DI) = end of file content Buffer\r
+#\r
+# ****************************************************************************\r
+ReadFile: \r
+# si = NumberOfClusters\r
+# cx = ClusterNumber\r
+# dx = CachedFatSectorNumber\r
+# ds:0000 = CacheFatSectorBuffer\r
+# es:di = Buffer to load file\r
+# bx = NextClusterNumber\r
+ pusha\r
+ movw $1,%si # NumberOfClusters = 1\r
+ pushw %cx # Push Start Cluster onto stack\r
+ movw $0xfff,%dx # CachedFatSectorNumber = 0xfff\r
+FatChainLoop: \r
+ movw %cx,%ax # ax = ClusterNumber \r
+ andw $0xfff8,%ax # ax = ax & 0xfff8\r
+ cmpw $0xfff8,%ax # See if this is the last cluster\r
+ je FoundLastCluster # Jump if last cluster found\r
+ movw %cx,%ax # ax = ClusterNumber\r
+ shlw $2, %ax # FatOffset = ClusterNumber * 2\r
+ pushw %si # Save si\r
+ movw %ax,%si # si = FatOffset\r
+ shrw $BLOCK_SHIFT, %ax # ax = FatOffset >> BLOCK_SHIFT\r
+ addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET)\r
+ andw $BLOCK_MASK, %si # si = FatOffset & BLOCK_MASK\r
+ cmpw %dx,%ax # Compare FatSectorNumber to CachedFatSectorNumber\r
+ je SkipFatRead\r
+ movw $2,%bx\r
+ pushw %es\r
+ pushw %ds\r
+ popw %es\r
+ call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI\r
+ popw %es\r
+ movw %ax,%dx # CachedFatSectorNumber = FatSectorNumber\r
+SkipFatRead: \r
+ movw (%si), %bx # bx = NextClusterNumber\r
+ movw %cx,%ax # ax = ClusterNumber\r
+ popw %si # Restore si\r
+ decw %bx # bx = NextClusterNumber - 1\r
+ cmpw %cx,%bx # See if (NextClusterNumber-1)==ClusterNumber\r
+ jne ReadClusters\r
+ incw %bx # bx = NextClusterNumber\r
+ incw %si # NumberOfClusters++\r
+ movw %bx,%cx # ClusterNumber = NextClusterNumber\r
+ jmp FatChainLoop\r
+ReadClusters: \r
+ incw %bx\r
+ popw %ax # ax = StartCluster\r
+ pushw %bx # StartCluster = NextClusterNumber\r
+ movw %bx,%cx # ClusterNumber = NextClusterNumber\r
+ subw $2,%ax # ax = StartCluster - 2\r
+ xorb %bh,%bh\r
+ movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster\r
+ mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster\r
+ addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster\r
+ pushw %ax # save start sector\r
+ movw %si,%ax # ax = NumberOfClusters\r
+ mulw %bx # ax = NumberOfClusters * SectorsPerCluster\r
+ movw %ax,%bx # bx = Number of Sectors\r
+ popw %ax # ax = Start Sector\r
+ call ReadBlocks\r
+ movw $1,%si # NumberOfClusters = 1\r
+ jmp FatChainLoop\r
+FoundLastCluster: \r
+ popw %cx\r
+ popa\r
+ ret\r
+\r
+\r
+# ****************************************************************************\r
+# ReadBlocks - Reads a set of blocks from a block device\r
+#\r
+# AX = Start LBA\r
+# BX = Number of Blocks to Read\r
+# ES:DI = Buffer to store sectors read from disk\r
+# ****************************************************************************\r
+\r
+# cx = Blocks\r
+# bx = NumberOfBlocks\r
+# si = StartLBA\r
+\r
+ReadBlocks: \r
+ pusha\r
addl LBAOffsetForBootSector(%bp), %eax # Add LBAOffsetForBootSector to Start LBA\r
- addl HiddenSectors(%bp), %eax # Add HiddenSectors to Start LBA
- movl %eax,%esi # esi = Start LBA
- movw %bx,%cx # cx = Number of blocks to read
-ReadCylinderLoop:
- movw $0x7bfc,%bp # bp = 0x7bfc
- movl %esi,%eax # eax = Start LBA
- xorl %edx,%edx # edx = 0
- movzwl (%bp), %ebx # bx = MaxSector
- divl %ebx # ax = StartLBA / MaxSector
- incw %dx # dx = (StartLBA % MaxSector) + 1
-
- movw (%bp), %bx # bx = MaxSector
- subw %dx,%bx # bx = MaxSector - Sector
- incw %bx # bx = MaxSector - Sector + 1
- cmpw %bx,%cx # Compare (Blocks) to (MaxSector - Sector + 1)
- jg LimitTransfer
- movw %cx,%bx # bx = Blocks
-LimitTransfer:
- pushw %ax # save ax
- movw %es,%ax # ax = es
- shrw $(BLOCK_SHIFT-4), %ax # ax = Number of blocks into mem system
- andw $0x7f,%ax # ax = Number of blocks into current seg
- addw %bx,%ax # ax = End Block number of transfer
- cmpw $0x80,%ax # See if it crosses a 64K boundry
- jle NotCrossing64KBoundry # Branch if not crossing 64K boundry
- subw $0x80,%ax # ax = Number of blocks past 64K boundry
- subw %ax,%bx # Decrease transfer size by block overage
-NotCrossing64KBoundry:
- popw %ax # restore ax
-
- pushw %cx
- movb %dl,%cl # cl = (StartLBA % MaxSector) + 1 = Sector
- xorw %dx,%dx # dx = 0
+ addl HiddenSectors(%bp), %eax # Add HiddenSectors to Start LBA\r
+ movl %eax,%esi # esi = Start LBA\r
+ movw %bx,%cx # cx = Number of blocks to read\r
+ReadCylinderLoop: \r
+ movw $0x7bfc,%bp # bp = 0x7bfc\r
+ movl %esi,%eax # eax = Start LBA\r
+ xorl %edx,%edx # edx = 0\r
+ movzwl (%bp), %ebx # bx = MaxSector\r
+ divl %ebx # ax = StartLBA / MaxSector\r
+ incw %dx # dx = (StartLBA % MaxSector) + 1\r
+\r
+ movw (%bp), %bx # bx = MaxSector\r
+ subw %dx,%bx # bx = MaxSector - Sector\r
+ incw %bx # bx = MaxSector - Sector + 1\r
+ cmpw %bx,%cx # Compare (Blocks) to (MaxSector - Sector + 1)\r
+ jg LimitTransfer\r
+ movw %cx,%bx # bx = Blocks\r
+LimitTransfer: \r
+ pushw %ax # save ax\r
+ movw %es,%ax # ax = es\r
+ shrw $(BLOCK_SHIFT-4), %ax # ax = Number of blocks into mem system\r
+ andw $0x7f,%ax # ax = Number of blocks into current seg\r
+ addw %bx,%ax # ax = End Block number of transfer\r
+ cmpw $0x80,%ax # See if it crosses a 64K boundry\r
+ jle NotCrossing64KBoundry # Branch if not crossing 64K boundry\r
+ subw $0x80,%ax # ax = Number of blocks past 64K boundry\r
+ subw %ax,%bx # Decrease transfer size by block overage\r
+NotCrossing64KBoundry: \r
+ popw %ax # restore ax\r
+\r
+ pushw %cx\r
+ movb %dl,%cl # cl = (StartLBA % MaxSector) + 1 = Sector\r
+ xorw %dx,%dx # dx = 0\r
divw 2(%bp) # ax = ax / (MaxHead + 1) = Cylinder \r
- # dx = ax % (MaxHead + 1) = Head
-
- pushw %bx # Save number of blocks to transfer
- movb %dl,%dh # dh = Head
- movw $0x7c00,%bp # bp = 0x7c00
- movb PhysicalDrive(%bp), %dl # dl = Drive Number
- movb %al,%ch # ch = Cylinder
- movb %bl,%al # al = Blocks
- movb $2,%ah # ah = Function 2
- movw %di,%bx # es:bx = Buffer address
- int $0x13
- jc DiskError
- popw %bx
- popw %cx
- movzwl %bx,%ebx
- addl %ebx,%esi # StartLBA = StartLBA + NumberOfBlocks
- subw %bx,%cx # Blocks = Blocks - NumberOfBlocks
- movw %es,%ax
- shlw $(BLOCK_SHIFT-4), %bx
- addw %bx,%ax
- movw %ax,%es # es:di = es:di + NumberOfBlocks*BLOCK_SIZE
- cmpw $0,%cx
- jne ReadCylinderLoop
- popa
- ret
-
-DiskError:
- pushw %cs
- popw %ds
- leaw ErrorString,%si
- movw $7,%cx
- jmp PrintStringAndHalt
-
-PrintStringAndHalt:
- movw $0xb800,%ax
- movw %ax,%es
- movw $160,%di
- rep
- movsw
-Halt:
- jmp Halt
-
+ # dx = ax % (MaxHead + 1) = Head\r
+\r
+ pushw %bx # Save number of blocks to transfer\r
+ movb %dl,%dh # dh = Head\r
+ movw $0x7c00,%bp # bp = 0x7c00\r
+ movb PhysicalDrive(%bp), %dl # dl = Drive Number\r
+ movb %al,%ch # ch = Cylinder\r
+ movb %bl,%al # al = Blocks\r
+ movb $2,%ah # ah = Function 2\r
+ movw %di,%bx # es:bx = Buffer address\r
+ int $0x13\r
+ jc DiskError\r
+ popw %bx\r
+ popw %cx\r
+ movzwl %bx,%ebx\r
+ addl %ebx,%esi # StartLBA = StartLBA + NumberOfBlocks\r
+ subw %bx,%cx # Blocks = Blocks - NumberOfBlocks\r
+ movw %es,%ax\r
+ shlw $(BLOCK_SHIFT-4), %bx\r
+ addw %bx,%ax\r
+ movw %ax,%es # es:di = es:di + NumberOfBlocks*BLOCK_SIZE\r
+ cmpw $0,%cx\r
+ jne ReadCylinderLoop\r
+ popa\r
+ ret\r
+\r
+DiskError: \r
+ pushw %cs\r
+ popw %ds\r
+ leaw ErrorString,%si\r
+ movw $7,%cx\r
+ jmp PrintStringAndHalt\r
+\r
+PrintStringAndHalt: \r
+ movw $0xb800,%ax\r
+ movw %ax,%es\r
+ movw $160,%di\r
+ rep\r
+ movsw\r
+Halt: \r
+ jmp Halt\r
+\r
ErrorString: \r
- .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!',0x0c
-
- .org 0x01fa
-LBAOffsetForBootSector:
- .long 0x0
-
- .org 0x01fe
- .word 0xaa55
-
-#******************************************************************************
-#******************************************************************************
-#******************************************************************************
-
-.equ DELAY_PORT, 0x0ed # Port to use for 1uS delay
-.equ KBD_CONTROL_PORT, 0x060 # 8042 control port
-.equ KBD_STATUS_PORT, 0x064 # 8042 status port
-.equ WRITE_DATA_PORT_CMD, 0x0d1 # 8042 command to write the data port
-.equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20
-
- .org 0x200
- jmp start
-Em64String:
-.byte 'E', 0x0c, 'm', 0x0c, '6', 0x0c, '4', 0x0c, 'T', 0x0c, ' ', 0x0c, 'U', 0x0c, 'n', 0x0c, 's', 0x0c, 'u', 0x0c, 'p', 0x0c, 'p', 0x0c, 'o', 0x0c, 'r', 0x0c, 't', 0x0c, 'e', 0x0c, 'd', 0x0c, '!', 0x0c
-
-start:
- movw %cs,%ax
- movw %ax,%ds
- movw %ax,%es
- movw %ax,%ss
- movw $MyStack, %sp
-
-# mov ax,0b800h
-# mov es,ax
-# mov byte ptr es:[160],'a'
-# mov ax,cs
-# mov es,ax
-
- movl $0,%ebx
- leal MemoryMap, %edi
-MemMapLoop:
- movl $0xe820,%eax
- movl $20,%ecx
- movl $0x534d4150, %edx # SMAP
- int $0x15
- jc MemMapDone
- addl $20,%edi
- cmpl $0,%ebx
- je MemMapDone
- jmp MemMapLoop
-MemMapDone:
- leal MemoryMap, %eax
- subl %eax,%edi # Get the address of the memory map
- movl %edi, MemoryMapSize # Save the size of the memory map
-
- xorl %ebx,%ebx
- movw %cs,%bx # BX=segment
- shll $4,%ebx # BX="linear" address of segment base
+ .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!',0x0c\r
+\r
+ .org 0x01fa\r
+LBAOffsetForBootSector: \r
+ .long 0x0\r
+\r
+ .org 0x01fe\r
+ .word 0xaa55\r
+\r
+#******************************************************************************\r
+#******************************************************************************\r
+#******************************************************************************\r
+\r
+.equ DELAY_PORT, 0x0ed # Port to use for 1uS delay\r
+.equ KBD_CONTROL_PORT, 0x060 # 8042 control port \r
+.equ KBD_STATUS_PORT, 0x064 # 8042 status port \r
+.equ WRITE_DATA_PORT_CMD, 0x0d1 # 8042 command to write the data port\r
+.equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20\r
+\r
+ .org 0x200\r
+ jmp start\r
+Em64String: \r
+.byte 'E', 0x0c, 'm', 0x0c, '6', 0x0c, '4', 0x0c, 'T', 0x0c, ' ', 0x0c, 'U', 0x0c, 'n', 0x0c, 's', 0x0c, 'u', 0x0c, 'p', 0x0c, 'p', 0x0c, 'o', 0x0c, 'r', 0x0c, 't', 0x0c, 'e', 0x0c, 'd', 0x0c, '!', 0x0c\r
+\r
+start: \r
+ movw %cs,%ax\r
+ movw %ax,%ds\r
+ movw %ax,%es\r
+ movw %ax,%ss\r
+ movw $MyStack, %sp\r
+\r
+# mov ax,0b800h\r
+# mov es,ax\r
+# mov byte ptr es:[160],'a'\r
+# mov ax,cs\r
+# mov es,ax\r
+\r
+ movl $0,%ebx\r
+ leal MemoryMap, %edi\r
+MemMapLoop: \r
+ movl $0xe820,%eax\r
+ movl $20,%ecx\r
+ movl $0x534d4150, %edx # SMAP\r
+ int $0x15\r
+ jc MemMapDone\r
+ addl $20,%edi\r
+ cmpl $0,%ebx\r
+ je MemMapDone\r
+ jmp MemMapLoop\r
+MemMapDone: \r
+ leal MemoryMap, %eax\r
+ subl %eax,%edi # Get the address of the memory map\r
+ movl %edi, MemoryMapSize # Save the size of the memory map\r
+\r
+ xorl %ebx,%ebx\r
+ movw %cs,%bx # BX=segment\r
+ shll $4,%ebx # BX="linear" address of segment base\r
leal GDT_BASE(%ebx), %eax # EAX=PHYSICAL address of gdt\r
movl %eax, (gdtr + 2) # Put address of gdt into the gdtr\r
leal IDT_BASE(%ebx), %eax # EAX=PHYSICAL address of idt\r
movl %eax, (idtr + 2) # Put address of idt into the idtr\r
- leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map
-
-# mov ax,0b800h
-# mov es,ax
-# mov byte ptr es:[162],'b'
-# mov ax,cs
-# mov es,ax
-
-#
-# Enable A20 Gate
-#
-
- movw $0x2401,%ax # Enable A20 Gate
- int $0x15
- jnc A20GateEnabled # Jump if it suceeded
-
-#
-# If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually.
-#
-
- call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
- jnz Timeout8042 # Jump if the 8042 timed out
- outw %ax, $DELAY_PORT # Delay 1 uS
- movb $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port
- outb %al, $KBD_STATUS_PORT # Send command to the 8042
- call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
- jnz Timeout8042 # Jump if the 8042 timed out
- movb $ENABLE_A20_CMD, %al # gate address bit 20 on
- outb %al, $KBD_CONTROL_PORT # Send command to thre 8042
- call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
- movw $25,%cx # Delay 25 uS for the command to complete on the 8042
-Delay25uS:
- outw %ax, $DELAY_PORT # Delay 1 uS
- loop Delay25uS
-Timeout8042:
-
-
-A20GateEnabled:
-
-#
-# DISABLE INTERRUPTS - Entering Protected Mode
-#
-
- cli
-
-# mov ax,0b800h
-# mov es,ax
-# mov byte ptr es:[164],'c'
-# mov ax,cs
-# mov es,ax
-
- leal OffsetIn32BitProtectedMode, %eax
- addl $0x20000+0x6,%eax
- movl %eax, OffsetIn32BitProtectedMode
-
- leal OffsetInLongMode, %eax
- addl $0x20000+0x6,%eax
- movl %eax, OffsetInLongMode
-
- #
- # load GDT
- #
- .byte 0x66
- lgdt gdtr
-
- #
- # Enable Protect Mode (set CR0.PE=1)
- #
- movl $cr0, %eax # Read CR0.
- orl $0x1,%eax # Set PE=1
- movl %eax, %cr0 # Write CR0.
- .byte 0x66
- .byte 0xea # jmp far 16:32
-OffsetIn32BitProtectedMode:
- .long 0x0000000 # offset $+8 (In32BitProtectedMode)
- .word 0x10 # selector (flat CS)
-In32BitProtectedMode:
-
-#
-# Entering Long Mode
-#
- .byte 0x66
- movw $8,%ax
- movw %ax,%ds
- movw %ax,%es
- movw %ax,%ss
-
- #
- # Enable the 64-bit page-translation-table entries by
- # setting CR4.PAE=1 (this is _required_ before activating
- # long mode). Paging is not enabled until after long mode
- # is enabled.
- #
- .byte 0xf
- .byte 0x20
- .byte 0xe0
-# mov eax, cr4
- btsl $5,%eax
- .byte 0xf
- .byte 0x22
- .byte 0xe0
-# mov cr4, eax
-
- #
- # This is the Trapolean Page Tables that are guarenteed
- # under 4GB.
- #
- # Address Map:
- # 10000 ~ 12000 - efildr (loaded)
- # 20000 ~ 21000 - start64.com
- # 21000 ~ 22000 - efi64.com
- # 22000 ~ 90000 - efildr
- # 90000 ~ 96000 - 4G pagetable (will be reload later)
- #
- .byte 0xb8
- .long 0x90000
-# mov eax, 90000h
- movl %eax, %cr3
-
- #
- # Enable long mode (set EFER.LME=1).
- #
- .byte 0xb9
- .long 0xc0000080
-# mov ecx, 0c0000080h ; EFER MSR number.
- .byte 0xf
- .byte 0x32
-# rdmsr ; Read EFER.
- .byte 0xf
- .byte 0xba
- .byte 0xe8
- .byte 0x8
-# bts eax, 8 ; Set LME=1.
- .byte 0xf
- .byte 0x30
-# wrmsr ; Write EFER.
-
- #
- # Enable paging to activate long mode (set CR0.PG=1)
- #
- movl $cr0, %eax # Read CR0.
- .byte 0xf
- .byte 0xba
- .byte 0xe8
- .byte 0x1f
-# bts eax, 31 ; Set PG=1.
- movl %eax, %cr0 # Write CR0.
- jmp GoToLongMode
-GoToLongMode:
-
- .byte 0x67
- .byte 0xea # Far Jump $+9:Selector to reload CS
-OffsetInLongMode:
- .long 00000000 # $+9 Offset is ensuing instruction boundary
- .word 0x38 # Selector is our code selector, 38h
-
-InLongMode:
- .byte 0x66
- movw $0x30,%ax
- movw %ax,%ds
-
- .byte 0x66
- movw $0x18,%ax
- movw %ax,%es
- movw %ax,%ss
- movw %ax,%ds
-
- .byte 0xbd
- .long 0x400000
-# mov ebp,000400000h ; Destination of EFILDR32
- .byte 0xbb
- .long 0x70000
-# mov ebx,000070000h ; Length of copy
-
- #
- # load idt later
- #
- .byte 0x48
- .byte 0x33
- .byte 0xc0
-# xor rax, rax
- .byte 0x66
- movw $idtr, %ax
- .byte 0x48
- .byte 0x5
- .long 0x20000
-# add rax, 20000h
-
- .byte 0xf
- .byte 0x1
- .byte 0x18
-# lidt fword ptr [rax]
-
- .byte 0x48
- .byte 0xc7
- .byte 0xc0
- .long 0x21000
-# mov rax, 21000h
- .byte 0x50
-# push rax
-
-# ret
- .byte 0xc3
-
-Empty8042InputBuffer:
- movw $0,%cx
-Empty8042Loop:
- outw %ax, $DELAY_PORT # Delay 1us
- inb $KBD_STATUS_PORT, %al # Read the 8042 Status Port
- andb $0x2,%al # Check the Input Buffer Full Flag
- loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS
- ret
-
-##############################################################################
-# data
-##############################################################################
-
- .align 0x2
-
- gdtr: .long GDT_END - GDT_BASE - 1 # GDT limit
- .long 0 # (GDT base gets set above)
-##############################################################################
-# global descriptor table (GDT)
-##############################################################################
-
- .align 0x2
-
-GDT_BASE:
-# null descriptor
-.equ NULL_SEL, .-GDT_BASE # Selector [0x0]
- .word 0 # limit 15:0
- .word 0 # base 15:0
- .byte 0 # base 23:16
- .byte 0 # type
- .byte 0 # limit 19:16, flags
- .byte 0 # base 31:24
-
-# linear data segment descriptor
-.equ LINEAR_SEL, .-GDT_BASE # Selector [0x8]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x92 # present, ring 0, data, expand-up, writable
- .byte 0xCF # page-granular, 32-bit
- .byte 0
-
-# linear code segment descriptor
-.equ LINEAR_CODE_SEL, .-GDT_BASE # Selector [0x10]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x9A # present, ring 0, data, expand-up, writable
- .byte 0xCF # page-granular, 32-bit
- .byte 0
-
-# system data segment descriptor
-.equ SYS_DATA_SEL, .-GDT_BASE # Selector [0x18]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x92 # present, ring 0, data, expand-up, writable
- .byte 0xCF # page-granular, 32-bit
- .byte 0
-
-# system code segment descriptor
-.equ SYS_CODE_SEL, .-GDT_BASE # Selector [0x20]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x9A # present, ring 0, data, expand-up, writable
- .byte 0xCF # page-granular, 32-bit
- .byte 0
-
-# spare segment descriptor
-.equ SPARE3_SEL, .-GDT_BASE # Selector [0x28]
- .word 0 # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0 # present, ring 0, data, expand-up, writable
- .byte 0 # page-granular, 32-bit
- .byte 0
-
-#
-# system data segment descriptor
-#
-.equ SYS_DATA64_SEL, .-GDT_BASE # Selector [0x30]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x92 # P | DPL [1..2] | 1 | 1 | C | R | A
- .byte 0xCF # G | D | L | AVL | Segment [19..16]
- .byte 0
-
-#
-# system code segment descriptor
-#
-.equ SYS_CODE64_SEL, .-GDT_BASE # Selector [0x38]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x9A # P | DPL [1..2] | 1 | 1 | C | R | A
- .byte 0xAF # G | D | L | AVL | Segment [19..16]
- .byte 0
-
-# spare segment descriptor
-.equ SPARE4_SEL, .-GDT_BASE # Selector [0x40]
- .word 0 # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0 # present, ring 0, data, expand-up, writable
- .byte 0 # page-granular, 32-bit
- .byte 0
-
-GDT_END:
-
- .align 0x2
-
-
-
-idtr: .long IDT_END - IDT_BASE - 1 # IDT limit
- .quad 0 # (IDT base gets set above)
-
-##############################################################################
-# interrupt descriptor table (IDT)
-#
-# Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ
-# mappings. This implementation only uses the system timer and all other
-# IRQs will remain masked. The descriptors for vectors 33+ are provided
-# for convenience.
-##############################################################################
-
-#idt_tag db "IDT",0
- .align 0x2
-
-
-IDT_BASE:
-# divide by zero (INT 0)
-.equ DIV_ZERO_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# debug exception (INT 1)
-.equ DEBUG_EXCEPT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# NMI (INT 2)
-.equ NMI_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# soft breakpoint (INT 3)
-.equ BREAKPOINT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# overflow (INT 4)
-.equ OVERFLOW_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# bounds check (INT 5)
-.equ BOUNDS_CHECK_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# invalid opcode (INT 6)
-.equ INVALID_OPCODE_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# device not available (INT 7)
-.equ DEV_NOT_AVAIL_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# double fault (INT 8)
-.equ DOUBLE_FAULT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# Coprocessor segment overrun - reserved (INT 9)
-.equ RSVD_INTR_SEL1, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# invalid TSS (INT 0ah)
-.equ INVALID_TSS_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# segment not present (INT 0bh)
-.equ SEG_NOT_PRESENT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# stack fault (INT 0ch)
-.equ STACK_FAULT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# general protection (INT 0dh)
-.equ GP_FAULT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# page fault (INT 0eh)
-.equ PAGE_FAULT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# Intel reserved - do not use (INT 0fh)
-.equ RSVD_INTR_SEL2, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# floating point error (INT 10h)
-.equ FLT_POINT_ERR_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# alignment check (INT 11h)
-.equ ALIGNMENT_CHECK_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# machine check (INT 12h)
-.equ MACHINE_CHECK_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# SIMD floating-point exception (INT 13h)
-.equ SIMD_EXCEPTION_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# 85 unspecified descriptors, First 12 of them are reserved, the rest are avail
- .fill 85 * 16, 1, 0 # db (85 * 16) dup(0)
-
-# IRQ 0 (System timer) - (INT 68h)
-.equ IRQ0_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 1 (8042 Keyboard controller) - (INT 69h)
-.equ IRQ1_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah)
-.equ IRQ2_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 3 (COM 2) - (INT 6bh)
-.equ IRQ3_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 4 (COM 1) - (INT 6ch)
-.equ IRQ4_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 5 (LPT 2) - (INT 6dh)
-.equ IRQ5_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 6 (Floppy controller) - (INT 6eh)
-.equ IRQ6_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 7 (LPT 1) - (INT 6fh)
-.equ IRQ7_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 8 (RTC Alarm) - (INT 70h)
-.equ IRQ8_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 9 - (INT 71h)
-.equ IRQ9_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 10 - (INT 72h)
-.equ IRQ10_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 11 - (INT 73h)
-.equ IRQ11_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 12 (PS/2 mouse) - (INT 74h)
-.equ IRQ12_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 13 (Floating point error) - (INT 75h)
-.equ IRQ13_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 14 (Secondary IDE) - (INT 76h)
-.equ IRQ14_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 15 (Primary IDE) - (INT 77h)
-.equ IRQ15_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-IDT_END:
-
- .align 0x2
-
-MemoryMapSize: .long 0
-MemoryMap: .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
-
- .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
-
- #.org 0x0fe0 #Just for pass build
-MyStack:
- # below is the pieces of the IVT that is used to redirect INT 68h - 6fh
- # back to INT 08h - 0fh when in real mode... It is 'org'ed to a
- # known low address (20f00) so it can be set up by PlMapIrqToVect in
- # 8259.c
-
- int $8
- iret
-
- int $9
- iret
-
- int $10
- iret
-
- int $11
- iret
-
- int $12
- iret
-
- int $13
- iret
-
- int $14
- iret
-
- int $15
- iret
-
-
- #.org 0x0ffe #Just for pass build
-BlockSignature:
- .word 0xaa55
-
+ leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map\r
+\r
+# mov ax,0b800h\r
+# mov es,ax\r
+# mov byte ptr es:[162],'b'\r
+# mov ax,cs\r
+# mov es,ax\r
+\r
+#\r
+# Enable A20 Gate \r
+#\r
+\r
+ movw $0x2401,%ax # Enable A20 Gate\r
+ int $0x15\r
+ jnc A20GateEnabled # Jump if it suceeded\r
+\r
+#\r
+# If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually.\r
+#\r
+\r
+ call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r
+ jnz Timeout8042 # Jump if the 8042 timed out\r
+ outw %ax, $DELAY_PORT # Delay 1 uS\r
+ movb $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port\r
+ outb %al, $KBD_STATUS_PORT # Send command to the 8042\r
+ call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r
+ jnz Timeout8042 # Jump if the 8042 timed out\r
+ movb $ENABLE_A20_CMD, %al # gate address bit 20 on\r
+ outb %al, $KBD_CONTROL_PORT # Send command to thre 8042\r
+ call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r
+ movw $25,%cx # Delay 25 uS for the command to complete on the 8042\r
+Delay25uS: \r
+ outw %ax, $DELAY_PORT # Delay 1 uS\r
+ loop Delay25uS\r
+Timeout8042: \r
+\r
+\r
+A20GateEnabled: \r
+\r
+#\r
+# DISABLE INTERRUPTS - Entering Protected Mode\r
+#\r
+\r
+ cli\r
+\r
+# mov ax,0b800h\r
+# mov es,ax\r
+# mov byte ptr es:[164],'c'\r
+# mov ax,cs\r
+# mov es,ax\r
+\r
+ leal OffsetIn32BitProtectedMode, %eax\r
+ addl $0x20000+0x6,%eax\r
+ movl %eax, OffsetIn32BitProtectedMode \r
+\r
+ leal OffsetInLongMode, %eax\r
+ addl $0x20000+0x6,%eax\r
+ movl %eax, OffsetInLongMode \r
+\r
+ #\r
+ # load GDT\r
+ #\r
+ .byte 0x66\r
+ lgdt gdtr\r
+\r
+ #\r
+ # Enable Protect Mode (set CR0.PE=1)\r
+ #\r
+ movl $cr0, %eax # Read CR0.\r
+ orl $0x1,%eax # Set PE=1\r
+ movl %eax, %cr0 # Write CR0.\r
+ .byte 0x66\r
+ .byte 0xea # jmp far 16:32\r
+OffsetIn32BitProtectedMode: \r
+ .long 0x0000000 # offset $+8 (In32BitProtectedMode)\r
+ .word 0x10 # selector (flat CS)\r
+In32BitProtectedMode: \r
+\r
+#\r
+# Entering Long Mode\r
+#\r
+ .byte 0x66\r
+ movw $8,%ax\r
+ movw %ax,%ds\r
+ movw %ax,%es\r
+ movw %ax,%ss\r
+\r
+ #\r
+ # Enable the 64-bit page-translation-table entries by\r
+ # setting CR4.PAE=1 (this is _required_ before activating\r
+ # long mode). Paging is not enabled until after long mode\r
+ # is enabled.\r
+ #\r
+ .byte 0xf\r
+ .byte 0x20\r
+ .byte 0xe0\r
+# mov eax, cr4\r
+ btsl $5,%eax\r
+ .byte 0xf\r
+ .byte 0x22\r
+ .byte 0xe0\r
+# mov cr4, eax\r
+\r
+ #\r
+ # This is the Trapolean Page Tables that are guarenteed\r
+ # under 4GB.\r
+ #\r
+ # Address Map:\r
+ # 10000 ~ 12000 - efildr (loaded)\r
+ # 20000 ~ 21000 - start64.com\r
+ # 21000 ~ 22000 - efi64.com\r
+ # 22000 ~ 90000 - efildr\r
+ # 90000 ~ 96000 - 4G pagetable (will be reload later)\r
+ #\r
+ .byte 0xb8\r
+ .long 0x90000\r
+# mov eax, 90000h\r
+ movl %eax, %cr3\r
+\r
+ #\r
+ # Enable long mode (set EFER.LME=1).\r
+ #\r
+ .byte 0xb9\r
+ .long 0xc0000080\r
+# mov ecx, 0c0000080h ; EFER MSR number.\r
+ .byte 0xf\r
+ .byte 0x32\r
+# rdmsr ; Read EFER.\r
+ .byte 0xf\r
+ .byte 0xba\r
+ .byte 0xe8\r
+ .byte 0x8\r
+# bts eax, 8 ; Set LME=1.\r
+ .byte 0xf\r
+ .byte 0x30\r
+# wrmsr ; Write EFER.\r
+\r
+ #\r
+ # Enable paging to activate long mode (set CR0.PG=1)\r
+ #\r
+ movl $cr0, %eax # Read CR0.\r
+ .byte 0xf\r
+ .byte 0xba\r
+ .byte 0xe8\r
+ .byte 0x1f\r
+# bts eax, 31 ; Set PG=1.\r
+ movl %eax, %cr0 # Write CR0.\r
+ jmp GoToLongMode\r
+GoToLongMode: \r
+\r
+ .byte 0x67\r
+ .byte 0xea # Far Jump $+9:Selector to reload CS\r
+OffsetInLongMode: \r
+ .long 00000000 # $+9 Offset is ensuing instruction boundary\r
+ .word 0x38 # Selector is our code selector, 38h\r
+\r
+InLongMode: \r
+ .byte 0x66\r
+ movw $0x30,%ax\r
+ movw %ax,%ds\r
+\r
+ .byte 0x66\r
+ movw $0x18,%ax\r
+ movw %ax,%es\r
+ movw %ax,%ss\r
+ movw %ax,%ds\r
+\r
+ .byte 0xbd\r
+ .long 0x400000\r
+# mov ebp,000400000h ; Destination of EFILDR32\r
+ .byte 0xbb\r
+ .long 0x70000\r
+# mov ebx,000070000h ; Length of copy\r
+\r
+ #\r
+ # load idt later\r
+ #\r
+ .byte 0x48\r
+ .byte 0x33\r
+ .byte 0xc0\r
+# xor rax, rax\r
+ .byte 0x66\r
+ movw $idtr, %ax\r
+ .byte 0x48\r
+ .byte 0x5\r
+ .long 0x20000\r
+# add rax, 20000h\r
+\r
+ .byte 0xf\r
+ .byte 0x1\r
+ .byte 0x18\r
+# lidt fword ptr [rax]\r
+\r
+ .byte 0x48\r
+ .byte 0xc7\r
+ .byte 0xc0\r
+ .long 0x21000\r
+# mov rax, 21000h\r
+ .byte 0x50\r
+# push rax\r
+\r
+# ret\r
+ .byte 0xc3\r
+\r
+Empty8042InputBuffer: \r
+ movw $0,%cx\r
+Empty8042Loop: \r
+ outw %ax, $DELAY_PORT # Delay 1us\r
+ inb $KBD_STATUS_PORT, %al # Read the 8042 Status Port\r
+ andb $0x2,%al # Check the Input Buffer Full Flag\r
+ loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS\r
+ ret\r
+\r
+##############################################################################\r
+# data\r
+##############################################################################\r
+\r
+ .align 0x2\r
+\r
+ gdtr: .long GDT_END - GDT_BASE - 1 # GDT limit \r
+ .long 0 # (GDT base gets set above)\r
+##############################################################################\r
+# global descriptor table (GDT)\r
+##############################################################################\r
+\r
+ .align 0x2\r
+\r
+GDT_BASE: \r
+# null descriptor\r
+.equ NULL_SEL, .-GDT_BASE # Selector [0x0]\r
+ .word 0 # limit 15:0\r
+ .word 0 # base 15:0\r
+ .byte 0 # base 23:16\r
+ .byte 0 # type\r
+ .byte 0 # limit 19:16, flags\r
+ .byte 0 # base 31:24\r
+\r
+# linear data segment descriptor\r
+.equ LINEAR_SEL, .-GDT_BASE # Selector [0x8]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x92 # present, ring 0, data, expand-up, writable\r
+ .byte 0xCF # page-granular, 32-bit\r
+ .byte 0\r
+\r
+# linear code segment descriptor\r
+.equ LINEAR_CODE_SEL, .-GDT_BASE # Selector [0x10]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x9A # present, ring 0, data, expand-up, writable\r
+ .byte 0xCF # page-granular, 32-bit\r
+ .byte 0\r
+\r
+# system data segment descriptor\r
+.equ SYS_DATA_SEL, .-GDT_BASE # Selector [0x18]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x92 # present, ring 0, data, expand-up, writable\r
+ .byte 0xCF # page-granular, 32-bit\r
+ .byte 0\r
+\r
+# system code segment descriptor\r
+.equ SYS_CODE_SEL, .-GDT_BASE # Selector [0x20]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x9A # present, ring 0, data, expand-up, writable\r
+ .byte 0xCF # page-granular, 32-bit\r
+ .byte 0\r
+\r
+# spare segment descriptor\r
+.equ SPARE3_SEL, .-GDT_BASE # Selector [0x28]\r
+ .word 0 # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0 # present, ring 0, data, expand-up, writable\r
+ .byte 0 # page-granular, 32-bit\r
+ .byte 0\r
+\r
+#\r
+# system data segment descriptor\r
+#\r
+.equ SYS_DATA64_SEL, .-GDT_BASE # Selector [0x30]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x92 # P | DPL [1..2] | 1 | 1 | C | R | A\r
+ .byte 0xCF # G | D | L | AVL | Segment [19..16]\r
+ .byte 0\r
+\r
+#\r
+# system code segment descriptor\r
+#\r
+.equ SYS_CODE64_SEL, .-GDT_BASE # Selector [0x38]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x9A # P | DPL [1..2] | 1 | 1 | C | R | A\r
+ .byte 0xAF # G | D | L | AVL | Segment [19..16]\r
+ .byte 0\r
+\r
+# spare segment descriptor\r
+.equ SPARE4_SEL, .-GDT_BASE # Selector [0x40]\r
+ .word 0 # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0 # present, ring 0, data, expand-up, writable\r
+ .byte 0 # page-granular, 32-bit\r
+ .byte 0\r
+\r
+GDT_END: \r
+\r
+ .align 0x2\r
+\r
+\r
+\r
+idtr: .long IDT_END - IDT_BASE - 1 # IDT limit\r
+ .quad 0 # (IDT base gets set above)\r
+\r
+##############################################################################\r
+# interrupt descriptor table (IDT)\r
+#\r
+# Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ\r
+# mappings. This implementation only uses the system timer and all other\r
+# IRQs will remain masked. The descriptors for vectors 33+ are provided\r
+# for convenience.\r
+##############################################################################\r
+\r
+#idt_tag db "IDT",0 \r
+ .align 0x2\r
+\r
+\r
+IDT_BASE: \r
+# divide by zero (INT 0)\r
+.equ DIV_ZERO_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# debug exception (INT 1)\r
+.equ DEBUG_EXCEPT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# NMI (INT 2)\r
+.equ NMI_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# soft breakpoint (INT 3)\r
+.equ BREAKPOINT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# overflow (INT 4)\r
+.equ OVERFLOW_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# bounds check (INT 5)\r
+.equ BOUNDS_CHECK_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# invalid opcode (INT 6)\r
+.equ INVALID_OPCODE_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# device not available (INT 7)\r
+.equ DEV_NOT_AVAIL_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# double fault (INT 8)\r
+.equ DOUBLE_FAULT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# Coprocessor segment overrun - reserved (INT 9)\r
+.equ RSVD_INTR_SEL1, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# invalid TSS (INT 0ah)\r
+.equ INVALID_TSS_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# segment not present (INT 0bh)\r
+.equ SEG_NOT_PRESENT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# stack fault (INT 0ch)\r
+.equ STACK_FAULT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# general protection (INT 0dh)\r
+.equ GP_FAULT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# page fault (INT 0eh)\r
+.equ PAGE_FAULT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# Intel reserved - do not use (INT 0fh)\r
+.equ RSVD_INTR_SEL2, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# floating point error (INT 10h)\r
+.equ FLT_POINT_ERR_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# alignment check (INT 11h)\r
+.equ ALIGNMENT_CHECK_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# machine check (INT 12h)\r
+.equ MACHINE_CHECK_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# SIMD floating-point exception (INT 13h)\r
+.equ SIMD_EXCEPTION_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# 85 unspecified descriptors, First 12 of them are reserved, the rest are avail\r
+ .fill 85 * 16, 1, 0 # db (85 * 16) dup(0)\r
+\r
+# IRQ 0 (System timer) - (INT 68h)\r
+.equ IRQ0_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 1 (8042 Keyboard controller) - (INT 69h)\r
+.equ IRQ1_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah)\r
+.equ IRQ2_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 3 (COM 2) - (INT 6bh)\r
+.equ IRQ3_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 4 (COM 1) - (INT 6ch)\r
+.equ IRQ4_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 5 (LPT 2) - (INT 6dh)\r
+.equ IRQ5_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 6 (Floppy controller) - (INT 6eh)\r
+.equ IRQ6_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 7 (LPT 1) - (INT 6fh)\r
+.equ IRQ7_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 8 (RTC Alarm) - (INT 70h)\r
+.equ IRQ8_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 9 - (INT 71h)\r
+.equ IRQ9_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 10 - (INT 72h)\r
+.equ IRQ10_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 11 - (INT 73h)\r
+.equ IRQ11_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 12 (PS/2 mouse) - (INT 74h)\r
+.equ IRQ12_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 13 (Floating point error) - (INT 75h)\r
+.equ IRQ13_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 14 (Secondary IDE) - (INT 76h)\r
+.equ IRQ14_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 15 (Primary IDE) - (INT 77h)\r
+.equ IRQ15_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+IDT_END: \r
+\r
+ .align 0x2\r
+\r
+MemoryMapSize: .long 0\r
+MemoryMap: .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+\r
+ .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0\r
+\r
+ #.org 0x0fe0 #Just for pass build\r
+MyStack: \r
+ # below is the pieces of the IVT that is used to redirect INT 68h - 6fh\r
+ # back to INT 08h - 0fh when in real mode... It is 'org'ed to a\r
+ # known low address (20f00) so it can be set up by PlMapIrqToVect in\r
+ # 8259.c\r
+\r
+ int $8\r
+ iret\r
+\r
+ int $9\r
+ iret\r
+\r
+ int $10\r
+ iret\r
+\r
+ int $11\r
+ iret\r
+\r
+ int $12\r
+ iret\r
+\r
+ int $13\r
+ iret\r
+\r
+ int $14\r
+ iret\r
+\r
+ int $15\r
+ iret\r
+\r
+\r
+ #.org 0x0ffe #Just for pass build\r
+BlockSignature: \r
+ .word 0xaa55\r
+\r
.equ BLOCK_MASK, 0x01ff\r
.equ BLOCK_SHIFT, 9\r
\r
- .org 0x0
-
+ .org 0x0\r
+\r
.global _start\r
-_start:
+_start:\r
\r
Ia32Jump: \r
jmp BootSectorEntryPoint # JMP inst - 3 bytes\r
.equ BLOCK_MASK, 0x01ff\r
.equ BLOCK_SHIFT, 9\r
\r
- .org 0x00
-
+ .org 0x00\r
+\r
.global _start\r
-_start:
+_start:\r
\r
Ia32Jump: \r
jmp BootSectorEntryPoint # JMP inst - 3 bytes\r
.equ BLOCK_MASK, 0x01ff\r
.equ BLOCK_SHIFT, 9\r
\r
- .org 0x0
-
-.global _start
-_start:
+ .org 0x0\r
+\r
+.global _start\r
+_start:\r
\r
Ia32Jump: \r
jmp BootSectorEntryPoint # JMP inst - 3 bytes\r
-#------------------------------------------------------------------------------
-#*
-#* Copyright 2006 - 2007, Intel Corporation
-#* All rights reserved. This program and the accompanying materials
-#* are licensed and made available under the terms and conditions of the BSD License
-#* which accompanies this distribution. The full text of the license may be found at
-#* http://opensource.org/licenses/bsd-license.php
-#*
-#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
-#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
-#*
-#* start64.asm
-#*
-#* Abstract:
-#*
-#------------------------------------------------------------------------------
-
-
- .stack:
- .486p:
- .code16
-
+#------------------------------------------------------------------------------\r
+#*\r
+#* Copyright 2006 - 2007, Intel Corporation \r
+#* All rights reserved. This program and the accompanying materials \r
+#* are licensed and made available under the terms and conditions of the BSD License \r
+#* which accompanies this distribution. The full text of the license may be found at \r
+#* http://opensource.org/licenses/bsd-license.php \r
+#* \r
+#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r
+#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r
+#* \r
+#* start64.asm\r
+#* \r
+#* Abstract:\r
+#*\r
+#------------------------------------------------------------------------------\r
+\r
+\r
+ .stack: \r
+ .486p: \r
+ .code16\r
+\r
.equ FAT_DIRECTORY_ENTRY_SIZE, 0x020\r
.equ FAT_DIRECTORY_ENTRY_SHIFT, 5\r
.equ BLOCK_SIZE, 0x0200\r
.equ BLOCK_MASK, 0x01ff\r
.equ BLOCK_SHIFT, 9\r
-
- .org 0x0
-Ia32Jump:
- jmp BootSectorEntryPoint # JMP inst - 3 bytes
- nop
-
-OemId: .ascii "INTEL " # OemId - 8 bytes
-
+\r
+ .org 0x0\r
+Ia32Jump: \r
+ jmp BootSectorEntryPoint # JMP inst - 3 bytes\r
+ nop\r
+\r
+OemId: .ascii "INTEL " # OemId - 8 bytes\r
+\r
SectorSize: .word 0 # Sector Size - 16 bits\r
SectorsPerCluster: .byte 0 # Sector Per Cluster - 8 bits\r
ReservedSectors: .word 0 # Reserved Sectors - 16 bits\r
Signature: .byte 0 # Signature - 8 bits - ignored\r
VolId: .ascii " " # Volume Serial Number- 4 bytes\r
FatLabel: .ascii " " # Label - 11 bytes\r
-SystemId: .ascii "FAT12 " # SystemId - 8 bytes
-
-BootSectorEntryPoint:
- # ASSUME ds:@code"
- # ASSUME ss:@code"
- # ds = 1000, es = 2000 + x (size of first cluster >> 4)
- # cx = Start Cluster of EfiLdr
- # dx = Start Cluster of Efivar.bin
-
-# Re use the BPB data stored in Boot Sector
- movw $0x7c00,%bp
-
- pushw %cx
-# Read Efivar.bin
-# 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already
- movw $0x1900,%ax
- movw %ax,%es
- testw %dx,%dx
- jnz CheckVarStoreSize
-
- movb $1,%al
-NoVarStore:
- pushw %es
-# Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl
- movb %al, %es:(4)
- jmp SaveVolumeId
-
-CheckVarStoreSize:
- movw %dx,%di
- cmpl $0x4000, %ds:2(%di)
- movb $2,%al
- jne NoVarStore
-
-LoadVarStore:
- movb $0,%al
- movb %al, %es:(4)
- movw (%di), %cx
-# ES:DI = 1500:0
- xorw %di,%di
- pushw %es
- movw $0x1500,%ax
- movw %ax,%es
- call ReadFile
-SaveVolumeId:
- popw %es
- movw VolId(%bp), %ax
- movw %ax, %es:(0)
- movw VolId+2(%bp), %ax
- movw %ax, %es:(2)
-
-# Read Efildr
- popw %cx
-# cx = Start Cluster of Efildr -> BS.com has filled already
-# ES:DI = 2000:0, first cluster will be read again
- xorw %di,%di # di = 0
- movw $0x2000,%ax
- movw %ax,%es
- call ReadFile
- movw %cs,%ax
- movw %ax, %cs:JumpSegment
-
-CheckEm64T:
- movl $0x80000001,%eax
-# cpuid
- .word 0xA20F
- btl $29,%edx
- jc CheckEm64TPass
- pushw %cs
- popw %ds
- leaw Em64String,%si
- movw $18,%cx
- jmp PrintStringAndHalt
-CheckEm64TPass:
-jumpFarInstruction:
- .byte 0xea
-jumpOffset:
- .word 0x200
-jumpSegment:
- .word 0x2000
-
-
-
-# ****************************************************************************
-# ReadFile
-#
-# Arguments:
-# CX = Start Cluster of File
-# ES:DI = Buffer to store file content read from disk
-#
-# Return:
-# (ES << 4 + DI) = end of file content Buffer
-#
-# ****************************************************************************
-ReadFile:
-# si = NumberOfClusters
-# cx = ClusterNumber
-# dx = CachedFatSectorNumber
-# ds:0000 = CacheFatSectorBuffer
-# es:di = Buffer to load file
-# bx = NextClusterNumber
- pusha
- movw $1,%si # NumberOfClusters = 1
- pushw %cx # Push Start Cluster onto stack
- movw $0xfff,%dx # CachedFatSectorNumber = 0xfff
-FatChainLoop:
- movw %cx,%ax # ax = ClusterNumber
- andw $0xff8,%ax # ax = ax & 0xff8
- cmpw $0xff8,%ax # See if this is the last cluster
- je FoundLastCluster # Jump if last cluster found
- movw %cx,%ax # ax = ClusterNumber
- shlw %ax # ax = ClusterNumber * 2
- addw %cx,%ax # ax = ClusterNumber * 2 + ClusterNumber = ClusterNumber * 3
- shrw %ax # FatOffset = ClusterNumber*3 / 2
- pushw %si # Save si
- movw %ax,%si # si = FatOffset
- shrw $BLOCK_SHIFT, %ax # ax = FatOffset >> BLOCK_SHIFT
- addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET)
- andw $BLOCK_MASK, %si # si = FatOffset & BLOCK_MASK
- cmpw %dx,%ax # Compare FatSectorNumber to CachedFatSectorNumber
- je SkipFatRead
- movw $2,%bx
- pushw %es
- pushw %ds
- popw %es
- call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI
- popw %es
- movw %ax,%dx # CachedFatSectorNumber = FatSectorNumber
-SkipFatRead:
- movw (%si), %bx # bx = NextClusterNumber
- movw %cx,%ax # ax = ClusterNumber
- andw $1,%ax # See if this is an odd cluster number
- je EvenFatEntry
- shrw $4,%bx # NextClusterNumber = NextClusterNumber >> 4
-EvenFatEntry:
- andw $0xfff,%bx # Strip upper 4 bits of NextClusterNumber
- popw %si # Restore si
- decw %bx # bx = NextClusterNumber - 1
- cmpw %cx,%bx # See if (NextClusterNumber-1)==ClusterNumber
- jne ReadClusters
- incw %bx # bx = NextClusterNumber
- incw %si # NumberOfClusters++
- movw %bx,%cx # ClusterNumber = NextClusterNumber
- jmp FatChainLoop
-ReadClusters:
- incw %bx
- popw %ax # ax = StartCluster
- pushw %bx # StartCluster = NextClusterNumber
- movw %bx,%cx # ClusterNumber = NextClusterNumber
- subw $2,%ax # ax = StartCluster - 2
- xorb %bh,%bh
- movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster
- mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster
- addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster
- pushw %ax # save start sector
- movw %si,%ax # ax = NumberOfClusters
- mulw %bx # ax = NumberOfClusters * SectorsPerCluster
- movw %ax,%bx # bx = Number of Sectors
- popw %ax # ax = Start Sector
- call ReadBlocks
- movw $1,%si # NumberOfClusters = 1
- jmp FatChainLoop
-FoundLastCluster:
- popw %cx
- popa
- ret
-
-
-# ****************************************************************************
-# ReadBlocks - Reads a set of blocks from a block device
-#
-# AX = Start LBA
-# BX = Number of Blocks to Read
-# ES:DI = Buffer to store sectors read from disk
-# ****************************************************************************
-
-# cx = Blocks
-# bx = NumberOfBlocks
-# si = StartLBA
-
-ReadBlocks:
- pusha
+SystemId: .ascii "FAT12 " # SystemId - 8 bytes\r
+\r
+BootSectorEntryPoint: \r
+ # ASSUME ds:@code"\r
+ # ASSUME ss:@code"\r
+ # ds = 1000, es = 2000 + x (size of first cluster >> 4)\r
+ # cx = Start Cluster of EfiLdr\r
+ # dx = Start Cluster of Efivar.bin\r
+\r
+# Re use the BPB data stored in Boot Sector\r
+ movw $0x7c00,%bp\r
+\r
+ pushw %cx\r
+# Read Efivar.bin\r
+# 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already\r
+ movw $0x1900,%ax\r
+ movw %ax,%es\r
+ testw %dx,%dx\r
+ jnz CheckVarStoreSize\r
+\r
+ movb $1,%al\r
+NoVarStore: \r
+ pushw %es\r
+# Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl\r
+ movb %al, %es:(4)\r
+ jmp SaveVolumeId\r
+\r
+CheckVarStoreSize: \r
+ movw %dx,%di\r
+ cmpl $0x4000, %ds:2(%di)\r
+ movb $2,%al\r
+ jne NoVarStore\r
+\r
+LoadVarStore: \r
+ movb $0,%al\r
+ movb %al, %es:(4)\r
+ movw (%di), %cx\r
+# ES:DI = 1500:0\r
+ xorw %di,%di\r
+ pushw %es\r
+ movw $0x1500,%ax\r
+ movw %ax,%es\r
+ call ReadFile\r
+SaveVolumeId: \r
+ popw %es\r
+ movw VolId(%bp), %ax\r
+ movw %ax, %es:(0) \r
+ movw VolId+2(%bp), %ax\r
+ movw %ax, %es:(2)\r
+\r
+# Read Efildr\r
+ popw %cx\r
+# cx = Start Cluster of Efildr -> BS.com has filled already\r
+# ES:DI = 2000:0, first cluster will be read again\r
+ xorw %di,%di # di = 0\r
+ movw $0x2000,%ax\r
+ movw %ax,%es\r
+ call ReadFile\r
+ movw %cs,%ax\r
+ movw %ax, %cs:JumpSegment\r
+\r
+CheckEm64T: \r
+ movl $0x80000001,%eax\r
+# cpuid\r
+ .word 0xA20F\r
+ btl $29,%edx\r
+ jc CheckEm64TPass\r
+ pushw %cs\r
+ popw %ds\r
+ leaw Em64String,%si\r
+ movw $18,%cx\r
+ jmp PrintStringAndHalt\r
+CheckEm64TPass: \r
+jumpFarInstruction: \r
+ .byte 0xea\r
+jumpOffset: \r
+ .word 0x200\r
+jumpSegment: \r
+ .word 0x2000\r
+\r
+\r
+\r
+# ****************************************************************************\r
+# ReadFile\r
+#\r
+# Arguments:\r
+# CX = Start Cluster of File\r
+# ES:DI = Buffer to store file content read from disk\r
+#\r
+# Return:\r
+# (ES << 4 + DI) = end of file content Buffer\r
+#\r
+# ****************************************************************************\r
+ReadFile: \r
+# si = NumberOfClusters\r
+# cx = ClusterNumber\r
+# dx = CachedFatSectorNumber\r
+# ds:0000 = CacheFatSectorBuffer\r
+# es:di = Buffer to load file\r
+# bx = NextClusterNumber\r
+ pusha\r
+ movw $1,%si # NumberOfClusters = 1\r
+ pushw %cx # Push Start Cluster onto stack\r
+ movw $0xfff,%dx # CachedFatSectorNumber = 0xfff\r
+FatChainLoop: \r
+ movw %cx,%ax # ax = ClusterNumber \r
+ andw $0xff8,%ax # ax = ax & 0xff8\r
+ cmpw $0xff8,%ax # See if this is the last cluster\r
+ je FoundLastCluster # Jump if last cluster found\r
+ movw %cx,%ax # ax = ClusterNumber\r
+ shlw %ax # ax = ClusterNumber * 2\r
+ addw %cx,%ax # ax = ClusterNumber * 2 + ClusterNumber = ClusterNumber * 3\r
+ shrw %ax # FatOffset = ClusterNumber*3 / 2\r
+ pushw %si # Save si\r
+ movw %ax,%si # si = FatOffset\r
+ shrw $BLOCK_SHIFT, %ax # ax = FatOffset >> BLOCK_SHIFT\r
+ addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET)\r
+ andw $BLOCK_MASK, %si # si = FatOffset & BLOCK_MASK\r
+ cmpw %dx,%ax # Compare FatSectorNumber to CachedFatSectorNumber\r
+ je SkipFatRead\r
+ movw $2,%bx\r
+ pushw %es\r
+ pushw %ds\r
+ popw %es\r
+ call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI\r
+ popw %es\r
+ movw %ax,%dx # CachedFatSectorNumber = FatSectorNumber\r
+SkipFatRead: \r
+ movw (%si), %bx # bx = NextClusterNumber\r
+ movw %cx,%ax # ax = ClusterNumber\r
+ andw $1,%ax # See if this is an odd cluster number\r
+ je EvenFatEntry\r
+ shrw $4,%bx # NextClusterNumber = NextClusterNumber >> 4\r
+EvenFatEntry: \r
+ andw $0xfff,%bx # Strip upper 4 bits of NextClusterNumber\r
+ popw %si # Restore si\r
+ decw %bx # bx = NextClusterNumber - 1\r
+ cmpw %cx,%bx # See if (NextClusterNumber-1)==ClusterNumber\r
+ jne ReadClusters\r
+ incw %bx # bx = NextClusterNumber\r
+ incw %si # NumberOfClusters++\r
+ movw %bx,%cx # ClusterNumber = NextClusterNumber\r
+ jmp FatChainLoop\r
+ReadClusters: \r
+ incw %bx\r
+ popw %ax # ax = StartCluster\r
+ pushw %bx # StartCluster = NextClusterNumber\r
+ movw %bx,%cx # ClusterNumber = NextClusterNumber\r
+ subw $2,%ax # ax = StartCluster - 2\r
+ xorb %bh,%bh\r
+ movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster\r
+ mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster\r
+ addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster\r
+ pushw %ax # save start sector\r
+ movw %si,%ax # ax = NumberOfClusters\r
+ mulw %bx # ax = NumberOfClusters * SectorsPerCluster\r
+ movw %ax,%bx # bx = Number of Sectors\r
+ popw %ax # ax = Start Sector\r
+ call ReadBlocks\r
+ movw $1,%si # NumberOfClusters = 1\r
+ jmp FatChainLoop\r
+FoundLastCluster: \r
+ popw %cx\r
+ popa\r
+ ret\r
+\r
+\r
+# ****************************************************************************\r
+# ReadBlocks - Reads a set of blocks from a block device\r
+#\r
+# AX = Start LBA\r
+# BX = Number of Blocks to Read\r
+# ES:DI = Buffer to store sectors read from disk\r
+# ****************************************************************************\r
+\r
+# cx = Blocks\r
+# bx = NumberOfBlocks\r
+# si = StartLBA\r
+\r
+ReadBlocks: \r
+ pusha\r
addl LBAOffsetForBootSector(%bp), %eax # Add LBAOffsetForBootSector to Start LBA\r
- addl HiddenSectors(%bp), %eax # Add HiddenSectors to Start LBA
- movl %eax,%esi # esi = Start LBA
- movw %bx,%cx # cx = Number of blocks to read
-ReadCylinderLoop:
- movw $0x7bfc,%bp # bp = 0x7bfc
- movl %esi,%eax # eax = Start LBA
- xorl %edx,%edx # edx = 0
- movzwl (%bp), %ebx # bx = MaxSector
- divl %ebx # ax = StartLBA / MaxSector
- incw %dx # dx = (StartLBA % MaxSector) + 1
-
- movw (%bp), %bx # bx = MaxSector
- subw %dx,%bx # bx = MaxSector - Sector
- incw %bx # bx = MaxSector - Sector + 1
- cmpw %bx,%cx # Compare (Blocks) to (MaxSector - Sector + 1)
- jg LimitTransfer
- movw %cx,%bx # bx = Blocks
-LimitTransfer:
- pushw %ax # save ax
- movw %es,%ax # ax = es
- shrw $(BLOCK_SHIFT-4), %ax # ax = Number of blocks into mem system
- andw $0x7f,%ax # ax = Number of blocks into current seg
- addw %bx,%ax # ax = End Block number of transfer
- cmpw $0x80,%ax # See if it crosses a 64K boundry
- jle NotCrossing64KBoundry # Branch if not crossing 64K boundry
- subw $0x80,%ax # ax = Number of blocks past 64K boundry
- subw %ax,%bx # Decrease transfer size by block overage
-NotCrossing64KBoundry:
- popw %ax # restore ax
-
- pushw %cx
- movb %dl,%cl # cl = (StartLBA % MaxSector) + 1 = Sector
- xorw %dx,%dx # dx = 0
- divw 2(%bp) # ax = ax / (MaxHead + 1) = Cylinder
- # dx = ax % (MaxHead + 1) = Head
-
- pushw %bx # Save number of blocks to transfer
- movb %dl,%dh # dh = Head
- movw $0x7c00,%bp # bp = 0x7c00
- movb PhysicalDrive(%bp), %dl # dl = Drive Number
- movb %al,%ch # ch = Cylinder
- movb %bl,%al # al = Blocks
- movb $2,%ah # ah = Function 2
- movw %di,%bx # es:bx = Buffer address
- int $0x13
- jc DiskError
- popw %bx
- popw %cx
- movzwl %bx,%ebx
- addl %ebx,%esi # StartLBA = StartLBA + NumberOfBlocks
- subw %bx,%cx # Blocks = Blocks - NumberOfBlocks
- movw %es,%ax
- shlw $(BLOCK_SHIFT-4), %bx
- addw %bx,%ax
- movw %ax,%es # es:di = es:di + NumberOfBlocks*BLOCK_SIZE
- cmpw $0,%cx
- jne ReadCylinderLoop
- popa
- ret
-
-DiskError:
- pushw %cs
- popw %ds
- leaw ErrorString,%si
- movw $7,%cx
- jmp PrintStringAndHalt
-
-PrintStringAndHalt:
- movw $0xb800,%ax
- movw %ax,%es
- movw $160,%di
- rep
- movsw
-Halt:
- jmp Halt
-
+ addl HiddenSectors(%bp), %eax # Add HiddenSectors to Start LBA\r
+ movl %eax,%esi # esi = Start LBA\r
+ movw %bx,%cx # cx = Number of blocks to read\r
+ReadCylinderLoop: \r
+ movw $0x7bfc,%bp # bp = 0x7bfc\r
+ movl %esi,%eax # eax = Start LBA\r
+ xorl %edx,%edx # edx = 0\r
+ movzwl (%bp), %ebx # bx = MaxSector\r
+ divl %ebx # ax = StartLBA / MaxSector\r
+ incw %dx # dx = (StartLBA % MaxSector) + 1\r
+\r
+ movw (%bp), %bx # bx = MaxSector\r
+ subw %dx,%bx # bx = MaxSector - Sector\r
+ incw %bx # bx = MaxSector - Sector + 1\r
+ cmpw %bx,%cx # Compare (Blocks) to (MaxSector - Sector + 1)\r
+ jg LimitTransfer\r
+ movw %cx,%bx # bx = Blocks\r
+LimitTransfer: \r
+ pushw %ax # save ax\r
+ movw %es,%ax # ax = es\r
+ shrw $(BLOCK_SHIFT-4), %ax # ax = Number of blocks into mem system\r
+ andw $0x7f,%ax # ax = Number of blocks into current seg\r
+ addw %bx,%ax # ax = End Block number of transfer\r
+ cmpw $0x80,%ax # See if it crosses a 64K boundry\r
+ jle NotCrossing64KBoundry # Branch if not crossing 64K boundry\r
+ subw $0x80,%ax # ax = Number of blocks past 64K boundry\r
+ subw %ax,%bx # Decrease transfer size by block overage\r
+NotCrossing64KBoundry: \r
+ popw %ax # restore ax\r
+\r
+ pushw %cx\r
+ movb %dl,%cl # cl = (StartLBA % MaxSector) + 1 = Sector\r
+ xorw %dx,%dx # dx = 0\r
+ divw 2(%bp) # ax = ax / (MaxHead + 1) = Cylinder \r
+ # dx = ax % (MaxHead + 1) = Head\r
+\r
+ pushw %bx # Save number of blocks to transfer\r
+ movb %dl,%dh # dh = Head\r
+ movw $0x7c00,%bp # bp = 0x7c00\r
+ movb PhysicalDrive(%bp), %dl # dl = Drive Number\r
+ movb %al,%ch # ch = Cylinder\r
+ movb %bl,%al # al = Blocks\r
+ movb $2,%ah # ah = Function 2\r
+ movw %di,%bx # es:bx = Buffer address\r
+ int $0x13\r
+ jc DiskError\r
+ popw %bx\r
+ popw %cx\r
+ movzwl %bx,%ebx\r
+ addl %ebx,%esi # StartLBA = StartLBA + NumberOfBlocks\r
+ subw %bx,%cx # Blocks = Blocks - NumberOfBlocks\r
+ movw %es,%ax\r
+ shlw $(BLOCK_SHIFT-4), %bx\r
+ addw %bx,%ax\r
+ movw %ax,%es # es:di = es:di + NumberOfBlocks*BLOCK_SIZE\r
+ cmpw $0,%cx\r
+ jne ReadCylinderLoop\r
+ popa\r
+ ret\r
+\r
+DiskError: \r
+ pushw %cs\r
+ popw %ds\r
+ leaw ErrorString,%si\r
+ movw $7,%cx\r
+ jmp PrintStringAndHalt\r
+\r
+PrintStringAndHalt: \r
+ movw $0xb800,%ax\r
+ movw %ax,%es\r
+ movw $160,%di\r
+ rep \r
+ movsw \r
+Halt: \r
+ jmp Halt\r
+\r
ErrorString: \r
- .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!',0x0c
-
- .org 0x01fa
-LBAOffsetForBootSector:
- .long 0x0
-
- .org 0x01fe
- .word 0xaa55
-
-#******************************************************************************
-#******************************************************************************
-#******************************************************************************
-
+ .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!',0x0c\r
+\r
+ .org 0x01fa\r
+LBAOffsetForBootSector: \r
+ .long 0x0\r
+\r
+ .org 0x01fe\r
+ .word 0xaa55\r
+\r
+#******************************************************************************\r
+#******************************************************************************\r
+#******************************************************************************\r
+\r
.equ DELAY_PORT, 0x0ed # Port to use for 1uS delay\r
.equ KBD_CONTROL_PORT, 0x060 # 8042 control port \r
.equ KBD_STATUS_PORT, 0x064 # 8042 status port \r
.equ WRITE_DATA_PORT_CMD, 0x0d1 # 8042 command to write the data port\r
-.equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20
-
- .org 0x200
- jmp start
-Em64String:
-.byte 'E', 0x0c, 'm', 0x0c, '6', 0x0c, '4', 0x0c, 'T', 0x0c, ' ', 0x0c, 'U', 0x0c, 'n', 0x0c, 's', 0x0c, 'u', 0x0c, 'p', 0x0c, 'p', 0x0c, 'o', 0x0c, 'r', 0x0c, 't', 0x0c, 'e', 0x0c, 'd', 0x0c, '!', 0x0c
-
-start:
- movw %cs,%ax
- movw %ax,%ds
- movw %ax,%es
- movw %ax,%ss
- movw $MyStack, %sp
-
-# mov ax,0b800h
-# mov es,ax
-# mov byte ptr es:[160],'a'
-# mov ax,cs
-# mov es,ax
-
- movl $0,%ebx
- leal MemoryMap, %edi
-MemMapLoop:
- movl $0xe820,%eax
- movl $20,%ecx
- movl $0x534d4150, %edx # SMAP
- int $0x15
- jc MemMapDone
- addl $20,%edi
- cmpl $0,%ebx
- je MemMapDone
- jmp MemMapLoop
-MemMapDone:
- leal MemoryMap, %eax
- subl %eax,%edi # Get the address of the memory map
- movl %edi, MemoryMapSize # Save the size of the memory map
-
- xorl %ebx,%ebx
- movw %cs,%bx # BX=segment
- shll $4,%ebx # BX="linear" address of segment base
+.equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20\r
+\r
+ .org 0x200\r
+ jmp start\r
+Em64String: \r
+.byte 'E', 0x0c, 'm', 0x0c, '6', 0x0c, '4', 0x0c, 'T', 0x0c, ' ', 0x0c, 'U', 0x0c, 'n', 0x0c, 's', 0x0c, 'u', 0x0c, 'p', 0x0c, 'p', 0x0c, 'o', 0x0c, 'r', 0x0c, 't', 0x0c, 'e', 0x0c, 'd', 0x0c, '!', 0x0c\r
+\r
+start: \r
+ movw %cs,%ax\r
+ movw %ax,%ds\r
+ movw %ax,%es\r
+ movw %ax,%ss\r
+ movw $MyStack, %sp\r
+\r
+# mov ax,0b800h\r
+# mov es,ax\r
+# mov byte ptr es:[160],'a'\r
+# mov ax,cs\r
+# mov es,ax\r
+\r
+ movl $0,%ebx\r
+ leal MemoryMap, %edi\r
+MemMapLoop: \r
+ movl $0xe820,%eax\r
+ movl $20,%ecx\r
+ movl $0x534d4150, %edx # SMAP\r
+ int $0x15\r
+ jc MemMapDone\r
+ addl $20,%edi\r
+ cmpl $0,%ebx\r
+ je MemMapDone\r
+ jmp MemMapLoop\r
+MemMapDone: \r
+ leal MemoryMap, %eax\r
+ subl %eax,%edi # Get the address of the memory map\r
+ movl %edi, MemoryMapSize # Save the size of the memory map\r
+\r
+ xorl %ebx,%ebx\r
+ movw %cs,%bx # BX=segment\r
+ shll $4,%ebx # BX="linear" address of segment base\r
leal GDT_BASE(%ebx), %eax # EAX=PHYSICAL address of gdt\r
movl %eax, (gdtr + 2) # Put address of gdt into the gdtr\r
leal IDT_BASE(%ebx), %eax # EAX=PHYSICAL address of idt\r
movl %eax, (idtr + 2) # Put address of idt into the idtr\r
- leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map
-
-# mov ax,0b800h
-# mov es,ax
-# mov byte ptr es:[162],'b'
-# mov ax,cs
-# mov es,ax
-
-#
-# Enable A20 Gate
-#
-
- movw $0x2401,%ax # Enable A20 Gate
- int $0x15
- jnc A20GateEnabled # Jump if it suceeded
-
-#
-# If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually.
-#
-
- call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
- jnz Timeout8042 # Jump if the 8042 timed out
- outw %ax, $DELAY_PORT # Delay 1 uS
- movb $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port
- outb %al, $KBD_STATUS_PORT # Send command to the 8042
- call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
- jnz Timeout8042 # Jump if the 8042 timed out
- movb $ENABLE_A20_CMD, %al # gate address bit 20 on
- outb %al, $KBD_CONTROL_PORT # Send command to thre 8042
- call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
- movw $25,%cx # Delay 25 uS for the command to complete on the 8042
-Delay25uS:
- outw %ax, $DELAY_PORT # Delay 1 uS
- loop Delay25uS
-Timeout8042:
-
-
-A20GateEnabled:
-
-#
-# DISABLE INTERRUPTS - Entering Protected Mode
-#
-
- cli
-
-# mov ax,0b800h
-# mov es,ax
-# mov byte ptr es:[164],'c'
-# mov ax,cs
-# mov es,ax
-
- leal OffsetIn32BitProtectedMode, %eax
- addl $0x20000+0x6,%eax
- movl %eax, OffsetIn32BitProtectedMode
-
- leal OffsetInLongMode, %eax
- addl $0x20000+0x6,%eax
- movl %eax, OffsetInLongMode
-
- #
- # load GDT
- #
- .byte 0x66
- lgdt gdtr
-
- #
- # Enable Protect Mode (set CR0.PE=1)
- #
- movl %cr0, %eax # Read CR0.
- orl $0x1,%eax # Set PE=1
- movl %eax, %cr0 # Write CR0.
- .byte 0x66
- .byte 0xea # jmp far 16:32
-OffsetIn32BitProtectedMode:
- .long 0x0000000 # offset $+8 (In32BitProtectedMode)
- .word 0x10 # selector (flat CS)
-In32BitProtectedMode:
-
-#
-# Entering Long Mode
-#
- .byte 0x66
- movw $8,%ax
- movw %ax,%ds
- movw %ax,%es
- movw %ax,%ss
-
- #
- # Enable the 64-bit page-translation-table entries by
- # setting CR4.PAE=1 (this is _required_ before activating
- # long mode). Paging is not enabled until after long mode
- # is enabled.
- #
- .byte 0xf
- .byte 0x20
- .byte 0xe0
-# mov eax, cr4
- btsl $5,%eax
- .byte 0xf
- .byte 0x22
- .byte 0xe0
-# mov cr4, eax
-
- #
- # This is the Trapolean Page Tables that are guarenteed
- # under 4GB.
- #
- # Address Map:
- # 10000 ~ 12000 - efildr (loaded)
- # 20000 ~ 21000 - start64.com
- # 21000 ~ 22000 - efi64.com
- # 22000 ~ 90000 - efildr
- # 90000 ~ 96000 - 4G pagetable (will be reload later)
- #
- .byte 0xb8
- .long 0x90000
-# mov eax, 90000h
- movl %eax, %cr3
-
- #
- # Enable long mode (set EFER.LME=1).
- #
- .byte 0xb9
- .long 0xc0000080
-# mov ecx, 0c0000080h ; EFER MSR number.
- .byte 0xf
- .byte 0x32
-# rdmsr ; Read EFER.
- .byte 0xf
- .byte 0xba
- .byte 0xe8
- .byte 0x8
-# bts eax, 8 ; Set LME=1.
- .byte 0xf
- .byte 0x30
-# wrmsr ; Write EFER.
-
- #
- # Enable paging to activate long mode (set CR0.PG=1)
- #
- movl $cr0, %eax # Read CR0.
- .byte 0xf
- .byte 0xba
- .byte 0xe8
- .byte 0x1f
-# bts eax, 31 ; Set PG=1.
- movl %eax, %cr0 # Write CR0.
- jmp GoToLongMode
-GoToLongMode:
-
- .byte 0x67
- .byte 0xea # Far Jump $+9:Selector to reload CS
-OffsetInLongMode:
- .long 00000000 # $+9 Offset is ensuing instruction boundary
- .word 0x38 # Selector is our code selector, 38h
-
-InLongMode:
- .byte 0x66
- movw $0x30,%ax
- movw %ax,%ds
-
- .byte 0x66
- movw $0x18,%ax
- movw %ax,%es
- movw %ax,%ss
- movw %ax,%ds
-
- .byte 0xbd
- .long 0x400000
-# mov ebp,000400000h ; Destination of EFILDR32
- .byte 0xbb
- .long 0x70000
-# mov ebx,000070000h ; Length of copy
-
- #
- # load idt later
- #
- .byte 0x48
- .byte 0x33
- .byte 0xc0
-# xor rax, rax
- .byte 0x66
- movw $idtr, %ax
- .byte 0x48
- .byte 0x5
- .long 0x20000
-# add rax, 20000h
-
- .byte 0xf
- .byte 0x1
- .byte 0x18
-# lidt fword ptr [rax]
-
- .byte 0x48
- .byte 0xc7
- .byte 0xc0
- .long 0x21000
-# mov rax, 21000h
- .byte 0x50
-# push rax
-
-# ret
- .byte 0xc3
-
-Empty8042InputBuffer:
- movw $0,%cx
-Empty8042Loop:
- outw %ax, $DELAY_PORT # Delay 1us
- inb $KBD_STATUS_PORT, %al # Read the 8042 Status Port
- andb $0x2,%al # Check the Input Buffer Full Flag
- loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS
- ret
-
-##############################################################################
-# data
-##############################################################################
-
- .align 0x2
-
- gdtr: .long GDT_END - GDT_BASE - 1 # GDT limit
- .long 0 # (GDT base gets set above)
-##############################################################################
-# global descriptor table (GDT)
-##############################################################################
-
- .align 0x2
-
-GDT_BASE:
-# null descriptor
-.equ NULL_SEL, .-GDT_BASE # Selector [0x0]
- .word 0 # limit 15:0
- .word 0 # base 15:0
- .byte 0 # base 23:16
- .byte 0 # type
- .byte 0 # limit 19:16, flags
- .byte 0 # base 31:24
-
-# linear data segment descriptor
-.equ LINEAR_SEL, .-GDT_BASE # Selector [0x8]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x92 # present, ring 0, data, expand-up, writable
- .byte 0xCF # page-granular, 32-bit
- .byte 0
-
-# linear code segment descriptor
-.equ LINEAR_CODE_SEL, .-GDT_BASE # Selector [0x10]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x9A # present, ring 0, data, expand-up, writable
- .byte 0xCF # page-granular, 32-bit
- .byte 0
-
-# system data segment descriptor
-.equ SYS_DATA_SEL, .-GDT_BASE # Selector [0x18]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x92 # present, ring 0, data, expand-up, writable
- .byte 0xCF # page-granular, 32-bit
- .byte 0
-
-# system code segment descriptor
-.equ SYS_CODE_SEL, .-GDT_BASE # Selector [0x20]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x9A # present, ring 0, data, expand-up, writable
- .byte 0xCF # page-granular, 32-bit
- .byte 0
-
-# spare segment descriptor
-.equ SPARE3_SEL, .-GDT_BASE # Selector [0x28]
- .word 0 # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0 # present, ring 0, data, expand-up, writable
- .byte 0 # page-granular, 32-bit
- .byte 0
-
-#
-# system data segment descriptor
-#
-.equ SYS_DATA64_SEL, .-GDT_BASE # Selector [0x30]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x92 # P | DPL [1..2] | 1 | 1 | C | R | A
- .byte 0xCF # G | D | L | AVL | Segment [19..16]
- .byte 0
-
-#
-# system code segment descriptor
-#
-.equ SYS_CODE64_SEL, .-GDT_BASE # Selector [0x38]
- .word 0xFFFF # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0x9A # P | DPL [1..2] | 1 | 1 | C | R | A
- .byte 0xAF # G | D | L | AVL | Segment [19..16]
- .byte 0
-
-# spare segment descriptor
-.equ SPARE4_SEL, .-GDT_BASE # Selector [0x40]
- .word 0 # limit 0xFFFFF
- .word 0 # base 0
- .byte 0
- .byte 0 # present, ring 0, data, expand-up, writable
- .byte 0 # page-granular, 32-bit
- .byte 0
-
-GDT_END:
-
- .align 0x2
-
-
-
-idtr: .long IDT_END - IDT_BASE - 1 # IDT limit
- .quad 0 # (IDT base gets set above)
-
-##############################################################################
-# interrupt descriptor table (IDT)
-#
-# Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ
-# mappings. This implementation only uses the system timer and all other
-# IRQs will remain masked. The descriptors for vectors 33+ are provided
-# for convenience.
-##############################################################################
-
-#idt_tag db "IDT",0
- .align 0x2
-
-
-IDT_BASE:
-# divide by zero (INT 0)
-.equ DIV_ZERO_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# debug exception (INT 1)
-.equ DEBUG_EXCEPT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# NMI (INT 2)
-.equ NMI_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# soft breakpoint (INT 3)
-.equ BREAKPOINT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# overflow (INT 4)
-.equ OVERFLOW_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# bounds check (INT 5)
-.equ BOUNDS_CHECK_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# invalid opcode (INT 6)
-.equ INVALID_OPCODE_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# device not available (INT 7)
-.equ DEV_NOT_AVAIL_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# double fault (INT 8)
-.equ DOUBLE_FAULT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# Coprocessor segment overrun - reserved (INT 9)
-.equ RSVD_INTR_SEL1, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# invalid TSS (INT 0ah)
-.equ INVALID_TSS_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# segment not present (INT 0bh)
-.equ SEG_NOT_PRESENT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# stack fault (INT 0ch)
-.equ STACK_FAULT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# general protection (INT 0dh)
-.equ GP_FAULT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# page fault (INT 0eh)
-.equ PAGE_FAULT_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# Intel reserved - do not use (INT 0fh)
-.equ RSVD_INTR_SEL2, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# floating point error (INT 10h)
-.equ FLT_POINT_ERR_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# alignment check (INT 11h)
-.equ ALIGNMENT_CHECK_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# machine check (INT 12h)
-.equ MACHINE_CHECK_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# SIMD floating-point exception (INT 13h)
-.equ SIMD_EXCEPTION_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# 85 unspecified descriptors, First 12 of them are reserved, the rest are avail
- .fill 85 * 16, 1, 0 # db (85 * 16) dup(0)
-
-# IRQ 0 (System timer) - (INT 68h)
-.equ IRQ0_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 1 (8042 Keyboard controller) - (INT 69h)
-.equ IRQ1_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah)
-.equ IRQ2_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 3 (COM 2) - (INT 6bh)
-.equ IRQ3_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 4 (COM 1) - (INT 6ch)
-.equ IRQ4_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 5 (LPT 2) - (INT 6dh)
-.equ IRQ5_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 6 (Floppy controller) - (INT 6eh)
-.equ IRQ6_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 7 (LPT 1) - (INT 6fh)
-.equ IRQ7_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 8 (RTC Alarm) - (INT 70h)
-.equ IRQ8_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 9 - (INT 71h)
-.equ IRQ9_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 10 - (INT 72h)
-.equ IRQ10_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 11 - (INT 73h)
-.equ IRQ11_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 12 (PS/2 mouse) - (INT 74h)
-.equ IRQ12_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 13 (Floating point error) - (INT 75h)
-.equ IRQ13_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 14 (Secondary IDE) - (INT 76h)
-.equ IRQ14_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-# IRQ 15 (Primary IDE) - (INT 77h)
-.equ IRQ15_SEL, .-IDT_BASE
- .word 0 # offset 15:0
- .long SYS_CODE64_SEL # selector 15:0
- .byte 0 # 0 for interrupt gate
- .byte 0x0e | 0x80 # type = 386 interrupt gate, present
- .word 0 # offset 31:16
- .long 0 # offset 63:32
- .long 0 # 0 for reserved
-
-IDT_END:
-
- .align 0x2
-
-MemoryMapSize: .long 0
-MemoryMap: .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0
-
- .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
- .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
-
- .org 0x0fe0
-MyStack:
- # below is the pieces of the IVT that is used to redirect INT 68h - 6fh
- # back to INT 08h - 0fh when in real mode... It is 'org'ed to a
- # known low address (20f00) so it can be set up by PlMapIrqToVect in
- # 8259.c
-
- int $8
- iret
-
- int $9
- iret
-
- int $10
- iret
-
- int $11
- iret
-
- int $12
- iret
-
- int $13
- iret
-
- int $14
- iret
-
- int $15
- iret
-
-
- .org 0x0ffe
-BlockSignature:
- .word 0xaa55
-
+ leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map\r
+\r
+# mov ax,0b800h\r
+# mov es,ax\r
+# mov byte ptr es:[162],'b'\r
+# mov ax,cs\r
+# mov es,ax\r
+\r
+#\r
+# Enable A20 Gate \r
+#\r
+\r
+ movw $0x2401,%ax # Enable A20 Gate\r
+ int $0x15\r
+ jnc A20GateEnabled # Jump if it suceeded\r
+\r
+#\r
+# If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually.\r
+#\r
+\r
+ call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r
+ jnz Timeout8042 # Jump if the 8042 timed out\r
+ outw %ax, $DELAY_PORT # Delay 1 uS\r
+ movb $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port\r
+ outb %al, $KBD_STATUS_PORT # Send command to the 8042\r
+ call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r
+ jnz Timeout8042 # Jump if the 8042 timed out\r
+ movb $ENABLE_A20_CMD, %al # gate address bit 20 on\r
+ outb %al, $KBD_CONTROL_PORT # Send command to thre 8042\r
+ call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller\r
+ movw $25,%cx # Delay 25 uS for the command to complete on the 8042\r
+Delay25uS: \r
+ outw %ax, $DELAY_PORT # Delay 1 uS\r
+ loop Delay25uS\r
+Timeout8042: \r
+\r
+\r
+A20GateEnabled: \r
+\r
+#\r
+# DISABLE INTERRUPTS - Entering Protected Mode\r
+#\r
+\r
+ cli\r
+\r
+# mov ax,0b800h\r
+# mov es,ax\r
+# mov byte ptr es:[164],'c'\r
+# mov ax,cs\r
+# mov es,ax\r
+\r
+ leal OffsetIn32BitProtectedMode, %eax\r
+ addl $0x20000+0x6,%eax\r
+ movl %eax, OffsetIn32BitProtectedMode \r
+\r
+ leal OffsetInLongMode, %eax\r
+ addl $0x20000+0x6,%eax\r
+ movl %eax, OffsetInLongMode \r
+\r
+ #\r
+ # load GDT\r
+ #\r
+ .byte 0x66\r
+ lgdt gdtr\r
+\r
+ #\r
+ # Enable Protect Mode (set CR0.PE=1)\r
+ #\r
+ movl %cr0, %eax # Read CR0.\r
+ orl $0x1,%eax # Set PE=1\r
+ movl %eax, %cr0 # Write CR0.\r
+ .byte 0x66\r
+ .byte 0xea # jmp far 16:32\r
+OffsetIn32BitProtectedMode: \r
+ .long 0x0000000 # offset $+8 (In32BitProtectedMode)\r
+ .word 0x10 # selector (flat CS)\r
+In32BitProtectedMode: \r
+\r
+#\r
+# Entering Long Mode\r
+#\r
+ .byte 0x66\r
+ movw $8,%ax\r
+ movw %ax,%ds\r
+ movw %ax,%es\r
+ movw %ax,%ss\r
+\r
+ #\r
+ # Enable the 64-bit page-translation-table entries by\r
+ # setting CR4.PAE=1 (this is _required_ before activating\r
+ # long mode). Paging is not enabled until after long mode\r
+ # is enabled.\r
+ #\r
+ .byte 0xf\r
+ .byte 0x20\r
+ .byte 0xe0\r
+# mov eax, cr4\r
+ btsl $5,%eax\r
+ .byte 0xf\r
+ .byte 0x22\r
+ .byte 0xe0\r
+# mov cr4, eax\r
+\r
+ #\r
+ # This is the Trapolean Page Tables that are guarenteed\r
+ # under 4GB.\r
+ #\r
+ # Address Map:\r
+ # 10000 ~ 12000 - efildr (loaded)\r
+ # 20000 ~ 21000 - start64.com\r
+ # 21000 ~ 22000 - efi64.com\r
+ # 22000 ~ 90000 - efildr\r
+ # 90000 ~ 96000 - 4G pagetable (will be reload later)\r
+ #\r
+ .byte 0xb8\r
+ .long 0x90000\r
+# mov eax, 90000h\r
+ movl %eax, %cr3\r
+\r
+ #\r
+ # Enable long mode (set EFER.LME=1).\r
+ #\r
+ .byte 0xb9\r
+ .long 0xc0000080\r
+# mov ecx, 0c0000080h ; EFER MSR number.\r
+ .byte 0xf\r
+ .byte 0x32\r
+# rdmsr ; Read EFER.\r
+ .byte 0xf\r
+ .byte 0xba\r
+ .byte 0xe8\r
+ .byte 0x8\r
+# bts eax, 8 ; Set LME=1.\r
+ .byte 0xf\r
+ .byte 0x30\r
+# wrmsr ; Write EFER.\r
+\r
+ #\r
+ # Enable paging to activate long mode (set CR0.PG=1)\r
+ #\r
+ movl $cr0, %eax # Read CR0.\r
+ .byte 0xf\r
+ .byte 0xba\r
+ .byte 0xe8\r
+ .byte 0x1f\r
+# bts eax, 31 ; Set PG=1.\r
+ movl %eax, %cr0 # Write CR0.\r
+ jmp GoToLongMode\r
+GoToLongMode: \r
+\r
+ .byte 0x67\r
+ .byte 0xea # Far Jump $+9:Selector to reload CS\r
+OffsetInLongMode: \r
+ .long 00000000 # $+9 Offset is ensuing instruction boundary\r
+ .word 0x38 # Selector is our code selector, 38h\r
+\r
+InLongMode: \r
+ .byte 0x66\r
+ movw $0x30,%ax\r
+ movw %ax,%ds\r
+\r
+ .byte 0x66\r
+ movw $0x18,%ax\r
+ movw %ax,%es\r
+ movw %ax,%ss\r
+ movw %ax,%ds\r
+\r
+ .byte 0xbd\r
+ .long 0x400000\r
+# mov ebp,000400000h ; Destination of EFILDR32\r
+ .byte 0xbb\r
+ .long 0x70000\r
+# mov ebx,000070000h ; Length of copy\r
+\r
+ #\r
+ # load idt later\r
+ #\r
+ .byte 0x48\r
+ .byte 0x33\r
+ .byte 0xc0\r
+# xor rax, rax\r
+ .byte 0x66\r
+ movw $idtr, %ax\r
+ .byte 0x48\r
+ .byte 0x5\r
+ .long 0x20000\r
+# add rax, 20000h\r
+\r
+ .byte 0xf\r
+ .byte 0x1\r
+ .byte 0x18\r
+# lidt fword ptr [rax]\r
+\r
+ .byte 0x48\r
+ .byte 0xc7\r
+ .byte 0xc0\r
+ .long 0x21000\r
+# mov rax, 21000h\r
+ .byte 0x50\r
+# push rax\r
+\r
+# ret\r
+ .byte 0xc3\r
+\r
+Empty8042InputBuffer: \r
+ movw $0,%cx\r
+Empty8042Loop: \r
+ outw %ax, $DELAY_PORT # Delay 1us\r
+ inb $KBD_STATUS_PORT, %al # Read the 8042 Status Port\r
+ andb $0x2,%al # Check the Input Buffer Full Flag\r
+ loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS\r
+ ret\r
+\r
+##############################################################################\r
+# data\r
+##############################################################################\r
+\r
+ .align 0x2\r
+\r
+ gdtr: .long GDT_END - GDT_BASE - 1 # GDT limit \r
+ .long 0 # (GDT base gets set above)\r
+##############################################################################\r
+# global descriptor table (GDT)\r
+##############################################################################\r
+\r
+ .align 0x2\r
+\r
+GDT_BASE: \r
+# null descriptor\r
+.equ NULL_SEL, .-GDT_BASE # Selector [0x0]\r
+ .word 0 # limit 15:0\r
+ .word 0 # base 15:0\r
+ .byte 0 # base 23:16\r
+ .byte 0 # type\r
+ .byte 0 # limit 19:16, flags\r
+ .byte 0 # base 31:24\r
+\r
+# linear data segment descriptor\r
+.equ LINEAR_SEL, .-GDT_BASE # Selector [0x8]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x92 # present, ring 0, data, expand-up, writable\r
+ .byte 0xCF # page-granular, 32-bit\r
+ .byte 0\r
+\r
+# linear code segment descriptor\r
+.equ LINEAR_CODE_SEL, .-GDT_BASE # Selector [0x10]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x9A # present, ring 0, data, expand-up, writable\r
+ .byte 0xCF # page-granular, 32-bit\r
+ .byte 0\r
+\r
+# system data segment descriptor\r
+.equ SYS_DATA_SEL, .-GDT_BASE # Selector [0x18]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x92 # present, ring 0, data, expand-up, writable\r
+ .byte 0xCF # page-granular, 32-bit\r
+ .byte 0\r
+\r
+# system code segment descriptor\r
+.equ SYS_CODE_SEL, .-GDT_BASE # Selector [0x20]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x9A # present, ring 0, data, expand-up, writable\r
+ .byte 0xCF # page-granular, 32-bit\r
+ .byte 0\r
+\r
+# spare segment descriptor\r
+.equ SPARE3_SEL, .-GDT_BASE # Selector [0x28]\r
+ .word 0 # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0 # present, ring 0, data, expand-up, writable\r
+ .byte 0 # page-granular, 32-bit\r
+ .byte 0\r
+\r
+#\r
+# system data segment descriptor\r
+#\r
+.equ SYS_DATA64_SEL, .-GDT_BASE # Selector [0x30]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x92 # P | DPL [1..2] | 1 | 1 | C | R | A\r
+ .byte 0xCF # G | D | L | AVL | Segment [19..16]\r
+ .byte 0\r
+\r
+#\r
+# system code segment descriptor\r
+#\r
+.equ SYS_CODE64_SEL, .-GDT_BASE # Selector [0x38]\r
+ .word 0xFFFF # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0x9A # P | DPL [1..2] | 1 | 1 | C | R | A\r
+ .byte 0xAF # G | D | L | AVL | Segment [19..16]\r
+ .byte 0\r
+\r
+# spare segment descriptor\r
+.equ SPARE4_SEL, .-GDT_BASE # Selector [0x40]\r
+ .word 0 # limit 0xFFFFF\r
+ .word 0 # base 0\r
+ .byte 0\r
+ .byte 0 # present, ring 0, data, expand-up, writable\r
+ .byte 0 # page-granular, 32-bit\r
+ .byte 0\r
+\r
+GDT_END: \r
+\r
+ .align 0x2\r
+\r
+\r
+\r
+idtr: .long IDT_END - IDT_BASE - 1 # IDT limit\r
+ .quad 0 # (IDT base gets set above)\r
+\r
+##############################################################################\r
+# interrupt descriptor table (IDT)\r
+#\r
+# Note: The hardware IRQ's specified in this table are the normal PC/AT IRQ\r
+# mappings. This implementation only uses the system timer and all other\r
+# IRQs will remain masked. The descriptors for vectors 33+ are provided\r
+# for convenience.\r
+##############################################################################\r
+\r
+#idt_tag db "IDT",0 \r
+ .align 0x2\r
+\r
+\r
+IDT_BASE: \r
+# divide by zero (INT 0)\r
+.equ DIV_ZERO_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# debug exception (INT 1)\r
+.equ DEBUG_EXCEPT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# NMI (INT 2)\r
+.equ NMI_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# soft breakpoint (INT 3)\r
+.equ BREAKPOINT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# overflow (INT 4)\r
+.equ OVERFLOW_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# bounds check (INT 5)\r
+.equ BOUNDS_CHECK_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# invalid opcode (INT 6)\r
+.equ INVALID_OPCODE_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# device not available (INT 7)\r
+.equ DEV_NOT_AVAIL_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# double fault (INT 8)\r
+.equ DOUBLE_FAULT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# Coprocessor segment overrun - reserved (INT 9)\r
+.equ RSVD_INTR_SEL1, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# invalid TSS (INT 0ah)\r
+.equ INVALID_TSS_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# segment not present (INT 0bh)\r
+.equ SEG_NOT_PRESENT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# stack fault (INT 0ch)\r
+.equ STACK_FAULT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# general protection (INT 0dh)\r
+.equ GP_FAULT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# page fault (INT 0eh)\r
+.equ PAGE_FAULT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# Intel reserved - do not use (INT 0fh)\r
+.equ RSVD_INTR_SEL2, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# floating point error (INT 10h)\r
+.equ FLT_POINT_ERR_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# alignment check (INT 11h)\r
+.equ ALIGNMENT_CHECK_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# machine check (INT 12h)\r
+.equ MACHINE_CHECK_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# SIMD floating-point exception (INT 13h)\r
+.equ SIMD_EXCEPTION_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# 85 unspecified descriptors, First 12 of them are reserved, the rest are avail\r
+ .fill 85 * 16, 1, 0 # db (85 * 16) dup(0)\r
+\r
+# IRQ 0 (System timer) - (INT 68h)\r
+.equ IRQ0_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 1 (8042 Keyboard controller) - (INT 69h)\r
+.equ IRQ1_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah)\r
+.equ IRQ2_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 3 (COM 2) - (INT 6bh)\r
+.equ IRQ3_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 4 (COM 1) - (INT 6ch)\r
+.equ IRQ4_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 5 (LPT 2) - (INT 6dh)\r
+.equ IRQ5_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 6 (Floppy controller) - (INT 6eh)\r
+.equ IRQ6_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 7 (LPT 1) - (INT 6fh)\r
+.equ IRQ7_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 8 (RTC Alarm) - (INT 70h)\r
+.equ IRQ8_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 9 - (INT 71h)\r
+.equ IRQ9_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 10 - (INT 72h)\r
+.equ IRQ10_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 11 - (INT 73h)\r
+.equ IRQ11_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 12 (PS/2 mouse) - (INT 74h)\r
+.equ IRQ12_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 13 (Floating point error) - (INT 75h)\r
+.equ IRQ13_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 14 (Secondary IDE) - (INT 76h)\r
+.equ IRQ14_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+# IRQ 15 (Primary IDE) - (INT 77h)\r
+.equ IRQ15_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE64_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ .long 0 # offset 63:32\r
+ .long 0 # 0 for reserved\r
+\r
+IDT_END: \r
+\r
+ .align 0x2\r
+\r
+MemoryMapSize: .long 0\r
+MemoryMap: .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0\r
+\r
+ .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0\r
+ .long 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0\r
+\r
+ .org 0x0fe0\r
+MyStack: \r
+ # below is the pieces of the IVT that is used to redirect INT 68h - 6fh\r
+ # back to INT 08h - 0fh when in real mode... It is 'org'ed to a\r
+ # known low address (20f00) so it can be set up by PlMapIrqToVect in\r
+ # 8259.c\r
+\r
+ int $8\r
+ iret\r
+\r
+ int $9\r
+ iret\r
+\r
+ int $10\r
+ iret\r
+\r
+ int $11\r
+ iret\r
+\r
+ int $12\r
+ iret\r
+\r
+ int $13\r
+ iret\r
+\r
+ int $14\r
+ iret\r
+\r
+ int $15\r
+ iret\r
+\r
+\r
+ .org 0x0ffe\r
+BlockSignature: \r
+ .word 0xaa55\r
+\r
projects / mirror_edk2.git / commitdiff