--- /dev/null
+#------------------------------------------------------------------------------
+#*
+#* 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
+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
+
+
+
--- /dev/null
+#------------------------------------------------------------------------------\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
+#* bootsect.asm\r
+#* \r
+#* Abstract:\r
+#*\r
+#------------------------------------------------------------------------------\r
+\r
+ #.MODEL small\r
+ .stack: \r
+ .486p: \r
+ .code: \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
+ # "EFILDR_____"\r
+.equ LOADER_FILENAME_PART1, 0x04c494645 # "EFIL"\r
+.equ LOADER_FILENAME_PART2, 0x020205244 # "DR__"\r
+.equ LOADER_FILENAME_PART3, 0x020202020 # "____"\r
+\r
+ .org 0x0\r
+Ia32Jump: \r
+ jmp BootSectorEntryPoint # JMP inst - 3 bytes\r
+ nop\r
+\r
+OemId: .ascii "INTEL " # OemId - 8 bytes\r
+# BPB data below will be fixed by tool\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
+NoFats: .byte 0 # Number of FATs - 8 bits\r
+RootEntries: .word 0 # Root Entries - 16 bits\r
+Sectors: .word 0 # Number of Sectors - 16 bits\r
+Media: .byte 0 # Media - 8 bits - ignored\r
+SectorsPerFat: .word 0 # Sectors Per FAT - 16 bits\r
+SectorsPerTrack: .word 0 # Sectors Per Track - 16 bits - ignored\r
+Heads: .word 0 # Heads - 16 bits - ignored\r
+HiddenSectors: .long 0 # Hidden Sectors - 32 bits - ignored\r
+LargeSectors: .long 0 # Large Sectors - 32 bits \r
+PhysicalDrive: .byte 0 # PhysicalDriveNumber - 8 bits - ignored\r
+CurrentHead: .byte 0 # Current Head - 8 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\r
+\r
+BootSectorEntryPoint: \r
+ #ASSUME ds:@code\r
+ #ASSUME ss:@code\r
+\r
+# ****************************************************************************\r
+# Start Print\r
+# ****************************************************************************\r
+ leaw %cs:StartString, %si\r
+ call PrintString\r
+\r
+# ****************************************************************************\r
+# Print over\r
+# ****************************************************************************\r
+\r
+ movw %cs, %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
+ cmpw $0xaa55, SectorSignature(%bp) # Verify Boot Sector Signature\r
+ jne BadBootSector\r
+ movw RootEntries(%bp), %cx # cx = RootEntries\r
+ shlw $FAT_DIRECTORY_ENTRY_SHIFT, %cx # cx = cx * 32 = cx * sizeof(FAT_DIRECTORY_ENTRY) = Size of Root Directory in bytes\r
+ movw %cx, %bx # bx = size of the Root Directory in bytes\r
+ andw $BLOCK_MASK, %bx # See if it is an even number of sectors long\r
+ jne BadBootSector # If is isn't, then the boot sector is bad.\r
+ movw %cx, %bx # bx = size of the Root Directory in bytes\r
+ shrw $BLOCK_SHIFT, %bx # bx = size of Root Directory in sectors\r
+ movb NoFats(%bp), %al # al = NoFats\r
+ xorb %ah, %ah # ah = 0 ==> ax = NoFats\r
+ mulw SectorsPerFat(%bp) # ax = NoFats * SectorsPerFat\r
+ addw ReservedSectors(%bp), %ax # ax = NoFats * SectorsPerFat + ReservedSectors = RootLBA\r
+ pushw %ds\r
+ popw %es\r
+ xorw %di, %di # Store directory in es:di = 1000:0000\r
+ call ReadBlocks # Read entire Root Directory\r
+ addw %bx, %ax # ax = NoFats * SectorsPerFat + ReservedSectors + RootDirSectors = FirstClusterLBA (FirstDataSector)\r
+ movw %ax, (%bp) # Save FirstClusterLBA (FirstDataSector) for later use\r
+\r
+ # dx - variable storage (initial value is 0)\r
+ # bx - loader (initial value is 0)\r
+ xorw %dx, %dx\r
+ xorw %bx, %bx\r
+\r
+FindEFILDR: \r
+ cmpl $LOADER_FILENAME_PART1, (%di) # Compare to "EFIL"\r
+ jne FindVARSTORE\r
+ cmpl $LOADER_FILENAME_PART2, 4(%di) \r
+ jne FindVARSTORE\r
+ cmpl $LOADER_FILENAME_PART3, 7(%di) \r
+ jne FindVARSTORE\r
+ movw 26(%di), %bx # bx = Start Cluster for EFILDR <----------------------------------\r
+ testw %dx, %dx\r
+ je FindNext # Efivar.bin is not loaded\r
+ jmp FoundAll\r
+\r
+FindVARSTORE: \r
+ ## if the file is not loader file, see if it's "EFIVAR BIN"\r
+ cmpl $0x56494645, (%di) # Compare to "EFIV"\r
+ jne FindNext\r
+ cmpl $0x20205241, 4(%di) # Compare to "AR "\r
+ jne FindNext\r
+ cmpl $0x4e494220, 7(%di) # Compare to " BIN"\r
+ jne FindNext\r
+ movw %di, %dx # dx = Offset of Start Cluster for Efivar.bin <---------------------\r
+ addw $26, %dx\r
+ testw %bx, %bx\r
+ je FindNext # Efildr is not loaded\r
+ jmp FoundAll\r
+\r
+FindNext: \r
+ # go to next find\r
+ addw $FAT_DIRECTORY_ENTRY_SIZE, %di # Increment di\r
+ subw $FAT_DIRECTORY_ENTRY_SIZE, %cx # Decrement cx\r
+ # TODO: jump to FindVarStore if ...\r
+ jne FindEFILDR\r
+ jmp NotFoundAll\r
+\r
+FoundAll: \r
+FoundEFILDR: \r
+ movw %bx, %cx # cx = Start Cluster for EFILDR <----------------------------------\r
+ movw %cs, %ax # Destination = 2000:0000\r
+ addw $0x2000, %ax\r
+ movw %ax, %es\r
+ xorw %di, %di\r
+ReadFirstClusterOfEFILDR: \r
+ movw %cx, %ax # ax = StartCluster\r
+ subw $2, %ax # ax = StartCluster - 2\r
+ xorb %bh, %bh\r
+ movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster\r
+ pushw %dx\r
+ mulw %bx\r
+ popw %dx # ax = (StartCluster - 2) * SectorsPerCluster\r
+ addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster\r
+ xorb %bh, %bh\r
+ movb SectorsPerCluster(%bp), %bl # bx = Number of Sectors in a cluster\r
+ pushw %es\r
+ call ReadBlocks\r
+ popw %ax\r
+JumpIntoFirstSectorOfEFILDR: \r
+ movw %ax, JumpSegment(%bp)\r
+JumpFarInstruction: \r
+ .byte 0xea\r
+JumpOffset: \r
+ .word 0x000\r
+JumpSegment: \r
+ .word 0x2000\r
+\r
+\r
+PrintString: \r
+ movw $0xb800, %ax\r
+ movw %ax, %es\r
+ movw $0x7c0, %ax\r
+ movw %ax, %ds\r
+ movw $7, %cx\r
+ movw $160, %di\r
+ rep\r
+ movsw\r
+ ret\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\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
+ 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 %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
+# ****************************************************************************\r
+# ERROR Condition:\r
+# ****************************************************************************\r
+NotFoundAll: \r
+ ## if we found EFILDR, continue\r
+ testw %bx, %bx\r
+ jne FoundEFILDR\r
+BadBootSector: \r
+DiskError: \r
+ leaw %cs:ErrorString, %si\r
+ call PrintString\r
+Halt: \r
+ jmp Halt\r
+\r
+StartString: \r
+ .byte 'B', 0x0c, 'S', 0x0c, 't', 0x0c, 'a', 0x0c, 'r', 0x0c, 't', 0x0c, '!', 0x0c\r
+ErrorString: \r
+ .byte 'B', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!', 0x0c\r
+\r
+# ****************************************************************************\r
+# LBA Offset for BootSector, need patched by tool for HD boot.\r
+# ****************************************************************************\r
+\r
+ # .org 0x01fa # Comment it for pass build. Should optimise code size. \r
+LBAOffsetForBootSector: \r
+ .long 0x0\r
+\r
+# ****************************************************************************\r
+# Sector Signature\r
+# ****************************************************************************\r
+\r
+ # .org 0x01fe # Comment it for pass build.\r
+SectorSignature: \r
+ .word 0xaa55 # Boot Sector Signature\r
+\r
+\r
+\r
--- /dev/null
+#------------------------------------------------------------------------------\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
+#* bs16.asm\r
+#* \r
+#* Abstract:\r
+#*\r
+#------------------------------------------------------------------------------\r
+\r
+ #.MODEL small\r
+ .stack: \r
+ .486p: \r
+ .code: \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
+ # "EFILDR_____"\r
+.equ LOADER_FILENAME_PART1, 0x04c494645 # "EFIL"\r
+.equ LOADER_FILENAME_PART2, 0x036315244 # "DR16"\r
+.equ LOADER_FILENAME_PART3, 0x020202036 # "6___"\r
+\r
+ .org 0x0\r
+Ia32Jump: \r
+ jmp BootSectorEntryPoint # JMP inst - 3 bytes\r
+ nop\r
+\r
+OemId: .ascii "INTEL " # OemId - 8 bytes\r
+# BPB data below will be fixed by tool\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
+NoFats: .byte 0 # Number of FATs - 8 bits\r
+RootEntries: .word 0 # Root Entries - 16 bits\r
+Sectors: .word 0 # Number of Sectors - 16 bits\r
+Media: .byte 0 # Media - 8 bits - ignored\r
+SectorsPerFat: .word 0 # Sectors Per FAT - 16 bits\r
+SectorsPerTrack: .word 0 # Sectors Per Track - 16 bits - ignored\r
+Heads: .word 0 # Heads - 16 bits - ignored\r
+HiddenSectors: .long 0 # Hidden Sectors - 32 bits - ignored\r
+LargeSectors: .long 0 # Large Sectors - 32 bits \r
+PhysicalDrive: .byte 0 # PhysicalDriveNumber - 8 bits - ignored\r
+CurrentHead: .byte 0 # Current Head - 8 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\r
+\r
+BootSectorEntryPoint: \r
+ #ASSUME ds:@code\r
+ #ASSUME ss:@code\r
+\r
+# ****************************************************************************\r
+# Start Print\r
+# ****************************************************************************\r
+ leaw %cs:StartString, %si\r
+ call PrintString\r
+\r
+# ****************************************************************************\r
+# Print over\r
+# ****************************************************************************\r
+\r
+ movw %cs, %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
+ cmpw $0xaa55, SectorSignature(%bp) # Verify Boot Sector Signature\r
+ jne BadBootSector\r
+ movw RootEntries(%bp), %cx # cx = RootEntries\r
+ shlw $FAT_DIRECTORY_ENTRY_SHIFT, %cx # cx = cx * 32 = cx * sizeof(FAT_DIRECTORY_ENTRY) = Size of Root Directory in bytes\r
+ movw %cx, %bx # bx = size of the Root Directory in bytes\r
+ andw $BLOCK_MASK, %bx # See if it is an even number of sectors long\r
+ jne BadBootSector # If is isn't, then the boot sector is bad.\r
+ movw %cx, %bx # bx = size of the Root Directory in bytes\r
+ shrw $BLOCK_SHIFT, %bx # bx = size of Root Directory in sectors\r
+ movb NoFats(%bp), %al # al = NoFats\r
+ xorb %ah, %ah # ah = 0 ==> ax = NoFats\r
+ mulw SectorsPerFat(%bp) # ax = NoFats * SectorsPerFat\r
+ addw ReservedSectors(%bp), %ax # ax = NoFats * SectorsPerFat + ReservedSectors = RootLBA\r
+ pushw %ds\r
+ popw %es\r
+ xorw %di, %di # Store directory in es:di = 1000:0000\r
+ call ReadBlocks # Read entire Root Directory\r
+ addw %bx, %ax # ax = NoFats * SectorsPerFat + ReservedSectors + RootDirSectors = FirstClusterLBA (FirstDataSector)\r
+ movw %ax, (%bp) # Save FirstClusterLBA (FirstDataSector) for later use\r
+\r
+ # dx - variable storage (initial value is 0)\r
+ # bx - loader (initial value is 0)\r
+ xorw %dx, %dx\r
+ xorw %bx, %bx\r
+\r
+FindEFILDR: \r
+ cmpl $LOADER_FILENAME_PART1, (%di) # Compare to "EFIL"\r
+ jne FindVARSTORE\r
+ cmpl $LOADER_FILENAME_PART2, 4(%di) \r
+ jne FindVARSTORE\r
+ cmpl $LOADER_FILENAME_PART3, 7(%di) \r
+ jne FindVARSTORE\r
+ movw 26(%di), %bx # bx = Start Cluster for EFILDR <----------------------------------\r
+ testw %dx, %dx\r
+ je FindNext # Efivar.bin is not loaded\r
+ jmp FoundAll\r
+\r
+FindVARSTORE: \r
+ ##if the file is not loader file, see if it's "EFIVAR BIN"\r
+ cmpl $0x56494645, (%di) # Compare to "EFIV"\r
+ jne FindNext\r
+ cmpl $0x20205241, 4(%di) # Compare to "AR "\r
+ jne FindNext\r
+ cmpl $0x4e494220, 7(%di) # Compare to " BIN"\r
+ jne FindNext\r
+ movw %di, %dx # dx = Offset of Start Cluster for Efivar.bin <---------------------\r
+ addw $26, %dx\r
+ testw %bx, %bx\r
+ je FindNext # Efildr is not loaded\r
+ jmp FoundAll\r
+\r
+FindNext: \r
+ # go to next find\r
+ addw $FAT_DIRECTORY_ENTRY_SIZE, %di # Increment di\r
+ subw $FAT_DIRECTORY_ENTRY_SIZE, %cx # Decrement cx\r
+ # TODO: jump to FindVarStore if ...\r
+ jne FindEFILDR\r
+ jmp NotFoundAll\r
+\r
+FoundAll: \r
+FoundEFILDR: \r
+ movw %bx, %cx # cx = Start Cluster for EFILDR <----------------------------------\r
+ movw %cs, %ax # Destination = 2000:0000\r
+ addw $0x2000, %ax\r
+ movw %ax, %es\r
+ xorw %di, %di\r
+ReadFirstClusterOfEFILDR: \r
+ movw %cx, %ax # ax = StartCluster\r
+ subw $2, %ax # ax = StartCluster - 2\r
+ xorb %bh, %bh\r
+ movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster\r
+ pushw %dx\r
+ mulw %bx\r
+ popw %dx # ax = (StartCluster - 2) * SectorsPerCluster\r
+ addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster\r
+ xorb %bh, %bh\r
+ movb SectorsPerCluster(%bp), %bl # bx = Number of Sectors in a cluster\r
+ pushw %es\r
+ call ReadBlocks\r
+ popw %ax\r
+JumpIntoFirstSectorOfEFILDR: \r
+ movw %ax, JumpSegment(%bp)\r
+JumpFarInstruction: \r
+ .byte 0xea\r
+JumpOffset: \r
+ .word 0x000\r
+JumpSegment: \r
+ .word 0x2000\r
+\r
+\r
+PrintString: \r
+ movw $0xb800, %ax\r
+ movw %ax, %es\r
+ movw $0x7c0, %ax\r
+ movw %ax, %ds\r
+ movw $7, %cx\r
+ movw $160, %di\r
+ rep\r
+ movsw\r
+ ret\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\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
+ 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 %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
+# ****************************************************************************\r
+# ERROR Condition:\r
+# ****************************************************************************\r
+NotFoundAll: \r
+ ## if we found EFILDR, continue\r
+ testw %bx, %bx\r
+ jne FoundEFILDR\r
+BadBootSector: \r
+DiskError: \r
+ leaw %cs:ErrorString, %si\r
+ call PrintString\r
+Halt: \r
+ jmp Halt\r
+\r
+StartString: \r
+ .byte 'B', 0x0c, 'S', 0x0c, 't', 0x0c, 'a', 0x0c, 'r', 0x0c, 't', 0x0c, '!', 0x0c\r
+ErrorString: \r
+ .byte 'B', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!', 0x0c\r
+\r
+# ****************************************************************************\r
+# LBA Offset for BootSector, need patched by tool for HD boot.\r
+# ****************************************************************************\r
+\r
+ # .org 0x01fa # Comment it for pass build. Should optimise code size. \r
+LBAOffsetForBootSector: \r
+ .long 0x0\r
+\r
+# ****************************************************************************\r
+# Sector Signature\r
+# ****************************************************************************\r
+\r
+ # .org 0x01fe # Comment it for pass build. Should optimise code size. \r
+SectorSignature: \r
+ .word 0xaa55 # Boot Sector Signature\r
+\r
+\r
+\r
--- /dev/null
+#------------------------------------------------------------------------------\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
+#* start.S\r
+#* \r
+#* Abstract:\r
+#*\r
+#------------------------------------------------------------------------------\r
+\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
+\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
+NoFats: .byte 0 # Number of FATs - 8 bits\r
+RootEntries: .word 0 # Root Entries - 16 bits\r
+Sectors: .word 0 # Number of Sectors - 16 bits\r
+Media: .byte 0 # Media - 8 bits - ignored\r
+SectorsPerFat: .word 0 # Sectors Per FAT - 16 bits\r
+SectorsPerTrack: .word 0 # Sectors Per Track - 16 bits - ignored\r
+Heads: .word 0 # Heads - 16 bits - ignored\r
+HiddenSectors: .long 0 # Hidden Sectors - 32 bits - ignored\r
+LargeSectors: .long 0 # Large Sectors - 32 bits \r
+PhysicalDrive: .byte 0 # PhysicalDriveNumber - 8 bits - ignored\r
+CurrentHead: .byte 0 # Current Head - 8 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\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) # 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)\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
+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 %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\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 %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 %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 %cs: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\r
+\r
+ #.org 0x0242 # For Code size overflow, Modified this just for pass build\r
+LBAOffsetForBootSector: \r
+ .long 0x0\r
+\r
+ #.org 0x0227 # For Code size overflow, Modified this just for pass build\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 #\r
+ movl %eax, (gdtr + 2) #\r
+ leal IDT_BASE(%ebx), %eax #\r
+ movl %eax, (idtr + 2) #\r
+ leal MemoryMapSize(%ebx), %edx #\r
+\r
+ addl $0x1000, %ebx # Source of EFI32\r
+ movl %ebx, JUMP+2\r
+ addl $0x1000, %ebx\r
+ movl %ebx, %esi # Source of EFILDR32\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
+ mov $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port\r
+ out %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
+ mov $ENABLE_A20_CMD, %al # gate address bit 20 on\r
+ out %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
+ .byte 0x66\r
+ lgdt gdtr\r
+ .byte 0x66\r
+ lidt idtr\r
+\r
+ movl %cr0, %eax\r
+ orb $1, %al\r
+ movl %eax, %cr0\r
+\r
+ movl $0x008, %eax # Flat data descriptor\r
+ movl $0x00400000, %ebp # Destination of EFILDR32\r
+ movl $0x00070000, %ebx # Length of copy\r
+\r
+JUMP: \r
+# jmp far 0010:00020000\r
+ .byte 0x66\r
+ .byte 0xea\r
+ .long 0x00020000\r
+ .word 0x0010\r
+\r
+Empty8042InputBuffer: \r
+ movw $0, %cx\r
+Empty8042Loop: \r
+ outw %ax, $DELAY_PORT # Delay 1us\r
+ in $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\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\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\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\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\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\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
+# spare segment descriptor\r
+.equ SPARE4_SEL, .-GDT_BASE\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
+# spare segment descriptor\r
+.equ SPARE5_SEL, .-GDT_BASE\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
+ .long 0 # (IDT base gets set above)\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
+IDT_BASE: \r
+# divide by zero (INT 0)\r
+.equ DIV_ZERO_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_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
+\r
+# debug exception (INT 1)\r
+.equ DEBUG_EXCEPT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_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
+\r
+# NMI (INT 2)\r
+.equ NMI_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_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
+\r
+# soft breakpoint (INT 3)\r
+.equ BREAKPOINT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_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
+\r
+# overflow (INT 4)\r
+.equ OVERFLOW_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_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
+\r
+# bounds check (INT 5)\r
+.equ BOUNDS_CHECK_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_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
+\r
+# invalid opcode (INT 6)\r
+.equ INVALID_OPCODE_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_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
+\r
+# device not available (INT 7)\r
+.equ DEV_NOT_AVAIL_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_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
+\r
+# double fault (INT 8)\r
+.equ DOUBLE_FAULT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_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
+\r
+# Coprocessor segment overrun - reserved (INT 9)\r
+.equ RSVD_INTR_SEL1, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_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
+\r
+# invalid TSS (INT 0x0a)\r
+.equ INVALID_TSS_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_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
+\r
+# segment not present (INT 0x0b)\r
+.equ SEG_NOT_PRESENT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_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
+\r
+# stack fault (INT 0x0c)\r
+.equ STACK_FAULT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_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
+\r
+# general protection (INT 0x0d)\r
+.equ GP_FAULT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_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
+\r
+# page fault (INT 0x0e)\r
+.equ PAGE_FAULT_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_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
+\r
+# Intel reserved - do not use (INT 0x0f)\r
+.equ RSVD_INTR_SEL2, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_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
+\r
+# floating point error (INT 0x10)\r
+.equ FLT_POINT_ERR_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_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
+\r
+# alignment check (INT 0x11)\r
+.equ ALIGNMENT_CHECK_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+\r
+# machine check (INT 0x12)\r
+.equ MACHINE_CHECK_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+\r
+# SIMD floating-point exception (INT 0x13)\r
+.equ SIMD_EXCEPTION_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+\r
+# 85 unspecified descriptors, First 12 of them are reserved, the rest are avail\r
+ .fill 85 * 8, 1, 0 # db (85 * 8) dup(0)\r
+\r
+# IRQ 0 (System timer) - (INT 0x68)\r
+.equ IRQ0_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+\r
+# IRQ 1 (8042 Keyboard controller) - (INT 0x69)\r
+.equ IRQ1_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+\r
+# Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 0x6a)\r
+.equ IRQ2_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+\r
+# IRQ 3 (COM 2) - (INT 0x6b)\r
+.equ IRQ3_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+\r
+# IRQ 4 (COM 1) - (INT 0x6c)\r
+.equ IRQ4_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+\r
+# IRQ 5 (LPT 2) - (INT 0x6d)\r
+.equ IRQ5_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+\r
+# IRQ 6 (Floppy controller) - (INT 0x6e)\r
+.equ IRQ6_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+\r
+# IRQ 7 (LPT 1) - (INT 0x6f)\r
+.equ IRQ7_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+\r
+# IRQ 8 (RTC Alarm) - (INT 0x70)\r
+.equ IRQ8_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+\r
+# IRQ 9 - (INT 0x71)\r
+.equ IRQ9_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+\r
+# IRQ 10 - (INT 0x72)\r
+.equ IRQ10_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+\r
+# IRQ 11 - (INT 0x73)\r
+.equ IRQ11_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+\r
+# IRQ 12 (PS/2 mouse) - (INT 0x74)\r
+.equ IRQ12_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+ \r
+# IRQ 13 (Floating point error) - (INT 0x75)\r
+.equ IRQ13_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+\r
+# IRQ 14 (Secondary IDE) - (INT 0x76)\r
+.equ IRQ14_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\r
+\r
+# IRQ 15 (Primary IDE) - (INT 0x77)\r
+.equ IRQ15_SEL, .-IDT_BASE\r
+ .word 0 # offset 15:0\r
+ .long SYS_CODE_SEL # selector 15:0\r
+ .byte 0 # 0 for interrupt gate\r
+ .byte 0x0e | 0x80 # (10001110)type = 386 interrupt gate, present\r
+ .word 0 # offset 31:16\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
+\r
projects / mirror_edk2.git / commitdiff