From: gikidy Date: Fri, 20 Feb 2009 08:22:04 +0000 (+0000) Subject: Port Intel .asm to GAS S X-Git-Tag: edk2-stable201903~18693 X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=commitdiff_plain;h=ccec4c39691f3e2bc3108ef82f744b278b59fda3 Port Intel .asm to GAS S git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7557 6f19259b-4bc3-4df7-8a09-765794883524 --- diff --git a/DuetPkg/BootSector/efi32.S b/DuetPkg/BootSector/efi32.S new file mode 100644 index 0000000000..421271c516 --- /dev/null +++ b/DuetPkg/BootSector/efi32.S @@ -0,0 +1,581 @@ +#------------------------------------------------------------------------------ +#* +#* 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. +#* +#* efi32.asm +#* +#* Abstract: +#* +#------------------------------------------------------------------------------ + +############################################################################## +# Now in 32-bit protected mode. +############################################################################## + + .486: + #.MODEL flat + .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 # A problem +.endm + +Start: + movw %ax, %ds + movw %ax, %es + movw %ax, %fs + movw %ax, %gs + movw %ax, %ss + movl $0x001ffff0, %esp + + 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 + 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 + movw %bx, (%edi) # write bits 15..0 of offset + movw $0x20, 2(%edi) # SYS_CODE_SEL from GDT + movw $(0x0e00 | 0x8000), 4(%edi) # type = 386 interrupt gate, present + movw %ax, 6(%edi) # write bits 31..16 of offset + addl $8, %edi # move up to next descriptor + addw DEFAULT_HANDLER_SIZE, %bx # move to next entry point + 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], 20h ; SYS_CODE_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 +# add edi, 8 ; 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 PrintDword +# 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 0x34(%ebp), %edi # edi = [[22000 + [22014] + 3c] + 30] = ImageBase + movl 0x28(%ebp), %eax # eax = [[22000 + [22014] + 3c] + 24] = EntryPoint + addl %edi, %eax # eax = ImageBase + EntryPoint + movl %eax, EfiLdrOffset # 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 + decw %bx + cmpw $0, %bx + jne SectionLoop + + movzwl Idtr, %eax # get size of IDT + incl %eax + addl Idtr + 2, %eax # add to base of IDT to get location of memory map... + pushl %eax # push memory map location on stack for call to EFILDR... + + pushl %eax # push return address (useless, just for stack balance) + .byte 0xb8 +EfiLdrOffset: + .long 0x00401000 # Offset of EFILDR +# mov eax, 401000h + pushl %eax + ret + +# 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 $0xxx # push vector number + .byte 0x6a + .long ( . - INTUnknown - 3 ) / 9 + 20 # vector number + jmpCommonIdtEntry +.endr + +commonIdtEntry: + pushal + movl %esp, %ebp +## +## At this point the stack looks like this: +## +## eflags +## Calling CS +## Calling EIP +## Error code or 0 +## Int num or 0ffh for unknown int num +## eax +## ecx +## edx +## ebx +## esp +## ebp +## esi +## edi <------- ESP, EBP +## + + call ClearScreen + movl String1, %esi + call PrintString + movl 32(%ebp), %eax ## move Int number into EAX + cmpl $19, %eax + ja PrintDefaultString +PrintExceptionString: + shll $2, %eax ## multiply by 4 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 + movl 44(%ebp), %eax # CS + call PrintDword + movb ':', %al + movb %al, (%edi) + addl $2, %edi + movl 40(%ebp), %eax # EIP + call PrintDword + movl String3, %esi + call PrintString + + movl $0xb8140, %edi + + movl StringEax, %esi # eax + call PrintString + movl 28(%ebp), %eax + call PrintDword + + movl StringEbx, %esi # ebx + call PrintString + movl 16(%ebp), %eax + call PrintDword + + movl StringEcx, %esi # ecx + call PrintString + movl 24(%ebp), %eax + call PrintDword + + movl StringEdx, %esi # edx + call PrintString + movl 20(%ebp), %eax + call PrintDword + + movl StringEcode, %esi # error code + call PrintString + movl 36(%ebp), %eax + call PrintDword + + movl $0xb81e0, %edi + + movl StringEsp, %esi # esp + call PrintString + movl 12(%ebp), %eax + call PrintDword + + movl StringEbp, %esi # ebp + call PrintString + movl 8(%ebp), %eax + call PrintDword + + movl StringEsi, %esi # esi + call PrintString + movl 4(%ebp), %eax + call PrintDword + + movl StringEdi, %esi # edi + call PrintString + movl (%ebp), %eax + call PrintDword + + movl StringEflags, %esi # eflags + call PrintString + movl 48(%ebp), %eax + call PrintDword + + movl $0xb8320, %edi + + movl %ebp, %esi + addl $52, %esi + movl $8, %ecx + + +OuterLoop: + pushl %ecx + movl $8, %ecx + movl %edi, %edx + +InnerLoop: + movl (%esi), %eax + call PrintDword + addl $4, %esi + movb ' ', %al + movb %al, (%edi) + addl $2, %edi + loop InnerLoop + + popl %ecx + addl $0xa0, %edx + movl %edx, %edi + loop OuterLoop + + + movl $0xb8960, %edi + + movl 40(%ebp), %eax # EIP + subl $32*4, %eax + movl %eax, %esi # esi = eip - 32 DWORD linear (total 64 DWORD) + + movl $8, %ecx + +OuterLoop1: + pushl %ecx + movl $8, %ecx + movl %edi, %edx + +InnerLoop1: + movl (%esi), %eax + call PrintDword + addl $4, %esi + movb ' ', %al + movb %al, (%edi) + addl $2, %edi + loop InnerLoop1 + + popl %ecx + addl $0xa0, %edx + movl %edx, %edi + loop OuterLoop1 + + + +# wbinvd ; this intruction does not support in early than 486 arch +LN_C1: + jmp LN_C1 +# +# return +# + movl %ebp, %esp + popal + addl $8, %esp # error code and INT number + + iretl + + +PrintString: + pushl %eax +LN_C2: + movb (%esi), %al + cmpb $0, %al + je LN_C3 + movb %al, (%edi) + incl %esi + addl $2, %edi + jmp LN_C2 +LN_C3: + popl %eax + ret + +## EAX contains dword to print +## EDI contains memory location (screen location) to print it to +PrintDword: + pushl %ecx + pushl %ebx + pushl %eax + + movl $8, %ecx +looptop: + roll $4, %eax + movb %al, %bl + andb $0xf, %bl + addb '0', %bl + cmpb '9', %bl + jle LN_C4 + addb $7, %bl +LN_C4: + movb %bl, (%edi) + addl $2, %edi + loop looptop + #wbinvd + + popl %eax + popl %ebx + popl %ecx + ret + +ClearScreen: + pushl %eax + pushl %ecx + + movb ' ', %al + movb $0xc, %ah + movl $0xb8000, %edi + movl $80*24, %ecx +LN_C5: + movw %ax, (%edi) + addl $2, %edi + loop LN_C5 + movl $0xb8000, %edi + + popl %ecx + popl %eax + + ret + +A2C: + andb $0xf, %al + addb '0', %al + cmpb '9', %al + jle LN_C6 + addb $7, %al +LN_C6: + ret + +String1: .asciz "*** INT " + +Int0String: .asciz "00h Divide by 0 -" +Int1String: .asciz "01h Debug exception -" +Int2String: .asciz "02h NMI -" +Int3String: .asciz "03h Breakpoint -" +Int4String: .asciz "04h Overflow -" +Int5String: .asciz "05h Bound -" +Int6String: .asciz "06h Invalid opcode -" +Int7String: .asciz "07h Device not available -" +Int8String: .asciz "08h Double fault -" +Int9String: .asciz "09h Coprocessor seg overrun (reserved) -" +Int10String: .asciz "0Ah Invalid TSS -" +Int11String: .asciz "0Bh Segment not present -" +Int12String: .asciz "0Ch Stack fault -" +Int13String: .asciz "0Dh General protection fault -" +Int14String: .asciz "0Eh Page fault -" +Int15String: .asciz "0Fh (Intel reserved) -" +Int16String: .asciz "10h Floating point error -" +Int17String: .asciz "11h Alignment check -" +Int18String: .asciz "12h Machine check -" +Int19String: .asciz "13h SIMD Floating-Point Exception -" +IntUnknownString: .asciz "??h Unknown interrupt -" + +StringTable: .long Int0String, Int1String, Int2String, Int3String, \ + Int4String, Int5String, Int6String, Int7String, \ + Int8String, Int9String, Int10String, Int11String, \ + Int12String, Int13String, Int14String, Int15String,\ + Int16String, Int17String, Int18String, Int19String + +String2: .asciz " HALT!! *** (" +String3: .asciz ")" +StringEax: .asciz "EAX=" +StringEbx: .asciz "EBX=" +StringEcx: .asciz "ECX=" +StringEdx: .asciz "EDX=" +StringEcode: .asciz "ECODE=" +StringEsp: .asciz "ESP=" +StringEbp: .asciz "EBP=" +StringEsi: .asciz "ESI=" +StringEdi: .asciz "EDI=" +StringEflags: .asciz "EFLAGS=" + +Idtr: .float 0 + + .org 0x21ffe +BlockSignature: + .word 0xaa55 + + diff --git a/DuetPkg/BootSector/start.S b/DuetPkg/BootSector/start.S index 9d06654108..d558652a9a 100644 --- a/DuetPkg/BootSector/start.S +++ b/DuetPkg/BootSector/start.S @@ -15,6 +15,10 @@ #* #------------------------------------------------------------------------------ + + + + .equ FAT_DIRECTORY_ENTRY_SIZE, 0x020 .equ FAT_DIRECTORY_ENTRY_SHIFT, 5 @@ -149,9 +153,9 @@ FatChainLoop: shrw %ax # FatOffset = ClusterNumber*3 / 2 pushw %si # Save si movw %ax, %si # si = FatOffset - shrw %ax # ax = FatOffset >> BLOCK_SHIFT + 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 + andw $BLOCK_MASK,%si # si = FatOffset & BLOCK_MASK cmpw %dx, %ax # Compare FatSectorNumber to CachedFatSectorNumber je SkipFatRead movw $2, %bx @@ -279,7 +283,7 @@ NotCrossing64KBoundry: DiskError: pushw %cs popw %ds - leaw %cs:ErrorString, %si + leaw ErrorString, %si movw $7, %cx jmp PrintStringAndHalt @@ -295,7 +299,7 @@ Halt: ErrorString: .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!',0x0c - #.org 0x0242 # For Code size overflow, Modified this just for pass build + .org 0x0241 # For Code size overflow, Modified this just for pass build LBAOffsetForBootSector: .long 0x0 diff --git a/DuetPkg/BootSector/start32.S b/DuetPkg/BootSector/start32.S new file mode 100644 index 0000000000..3ddebfc862 --- /dev/null +++ b/DuetPkg/BootSector/start32.S @@ -0,0 +1,928 @@ +#------------------------------------------------------------------------------ +#* +#* 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. +#* +#* start32.asm +#* +#* Abstract: +#* +#------------------------------------------------------------------------------ + + #.MODEL small + .stack: + .486p: + .code: + +.equ FAT_DIRECTORY_ENTRY_SIZE, 0x020 +.equ FAT_DIRECTORY_ENTRY_SHIFT, 5 +.equ BLOCK_SIZE, 0x0200 +.equ BLOCK_MASK, 0x01ff +.equ BLOCK_SHIFT, 9 + + .org 0x0 +Ia32Jump: + jmp BootSectorEntryPoint # JMP inst - 3 bytes + nop + +OemId: .ascii "INTEL " # OemId - 8 bytes +SectorSize: .word 0 # Sector Size - 2 bytes +SectorsPerCluster: .byte 0 # Sector Per Cluster - 1 byte +ReservedSectors: .word 0 # Reserved Sectors - 2 bytes +NoFats: .byte 0 # Number of FATs - 1 byte +RootEntries: .word 0 # Root Entries - 2 bytes +Sectors: .word 0 # Number of Sectors - 2 bytes +Media: .byte 0 # Media - 1 byte +SectorsPerFat16: .word 0 # Sectors Per FAT for FAT12/FAT16 - 2 byte +SectorsPerTrack: .word 0 # Sectors Per Track - 2 bytes +Heads: .word 0 # Heads - 2 bytes +HiddenSectors: .long 0 # Hidden Sectors - 4 bytes +LargeSectors: .long 0 # Large Sectors - 4 bytes + +#****************************************************************************** +# +#The structure for FAT32 starting at offset 36 of the boot sector. (At this point, +#the BPB/boot sector for FAT12 and FAT16 differs from the BPB/boot sector for FAT32.) +# +#****************************************************************************** + +SectorsPerFat32: .long 0 # Sectors Per FAT for FAT32 - 4 bytes +ExtFlags: .word 0 # Mirror Flag - 2 bytes +FSVersion: .word 0 # File System Version - 2 bytes +RootCluster: .long 0 # 1st Cluster Number of Root Dir - 4 bytes +FSInfo: .word 0 # Sector Number of FSINFO - 2 bytes +BkBootSector: .word 0 # Sector Number of Bk BootSector - 2 bytes +Reserved: .fill 12,1,0 # Reserved Field - 12 bytes +PhysicalDrive: .byte 0 # Physical Drive Number - 1 byte +Reserved1: .byte 0 # Reserved Field - 1 byte +Signature: .byte 0 # Extended Boot Signature - 1 byte +VolId: .ascii " " # Volume Serial Number - 4 bytes +FatLabel: .ascii " " # Volume Label - 11 bytes +FileSystemType: .ascii "FAT32 " # File System Type - 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) # Save Volume Id to 0:19000. we will find the correct volume according to this VolumeId + 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 +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 * 4 + 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 + addl LBAOffsetForBootSector(%bp), %eax # Add LBAOffsetForBootSector to Start LBA + 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 + +ErrorString: + .byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!', 0x0c + + .org 0x01fa # Will cause build break +LBAOffsetForBootSector: + .long 0x0 + + .org 0x01fe # Will cause build break + .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 # Will cause build break + 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 # 0x534d4150 = '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 + leal GDT_BASE(%ebx), %eax # EAX=PHYSICAL address of gdt + movl %eax, gdtr + 2 # Put address of gdt into the gdtr + leal IDT_BASE(%ebx), %eax # EAX=PHYSICAL address of idt + movl %eax, idtr + 2 # Put address of idt into the idtr + leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map + + addl $0x1000, %ebx # Source of EFI32 + movl %ebx, JUMP+2 + addl $0x1000, %ebx + movl %ebx, %esi # Source of EFILDR32 + +# 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 + loopl 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 + + .byte 0x66 + lgdt gdtr + .byte 0x66 + lidt idtr + + movl %cr0, %eax + orb $1, %al + movl %eax, %cr0 + + movl $0x008, %eax # Flat data descriptor + movl $0x00400000, %ebp # Destination of EFILDR32 + movl $0x00070000, %ebx # Length of copy + +JUMP: +# jmp far 0010:00020000 + .byte 0x66 + .byte 0xea + .long 0x00020000 + .word 0x0010 + +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: .word GDT_END - GDT_BASE - 1 + .long 0 # (GDT base gets set above) +############################################################################## +# global descriptor table (GDT) +############################################################################## + + .align 0x2 + +GDT_BASE: +# null descriptor +.equ NULL_SEL, .-GDT_BASE + .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 + .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 + .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 + .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 + .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 + .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 + +# spare segment descriptor +.equ SPARE4_SEL, .-GDT_BASE + .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 + +# spare segment descriptor +.equ SPARE5_SEL, .-GDT_BASE + .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: .word IDT_END - IDT_BASE - 1 + .long 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 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# debug exception (INT 1) +.equ DEBUG_EXCEPT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# NMI (INT 2) +.equ NMI_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# soft breakpoint (INT 3) +.equ BREAKPOINT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# overflow (INT 4) +.equ OVERFLOW_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# bounds check (INT 5) +.equ BOUNDS_CHECK_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# invalid opcode (INT 6) +.equ INVALID_OPCODE_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# device not available (INT 7) +.equ DEV_NOT_AVAIL_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# double fault (INT 8) +.equ DOUBLE_FAULT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# Coprocessor segment overrun - reserved (INT 9) +.equ RSVD_INTR_SEL1, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# invalid TSS (INT 0ah) +.equ INVALID_TSS_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# segment not present (INT 0bh) +.equ SEG_NOT_PRESENT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# stack fault (INT 0ch) +.equ STACK_FAULT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# general protection (INT 0dh) +.equ GP_FAULT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# page fault (INT 0eh) +.equ PAGE_FAULT_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# Intel reserved - do not use (INT 0fh) +.equ RSVD_INTR_SEL2, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# floating point error (INT 10h) +.equ FLT_POINT_ERR_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# alignment check (INT 11h) +.equ ALIGNMENT_CHECK_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# machine check (INT 12h) +.equ MACHINE_CHECK_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# SIMD floating-point exception (INT 13h) +.equ SIMD_EXCEPTION_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# 85 unspecified descriptors, First 12 of them are reserved, the rest are avail + .fill 85 * 8, 1, 0 + +# IRQ 0 (System timer) - (INT 68h) +.equ IRQ0_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# IRQ 1 (8042 Keyboard controller) - (INT 69h) +.equ IRQ1_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah) +.equ IRQ2_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# IRQ 3 (COM 2) - (INT 6bh) +.equ IRQ3_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# IRQ 4 (COM 1) - (INT 6ch) +.equ IRQ4_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# IRQ 5 (LPT 2) - (INT 6dh) +.equ IRQ5_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# IRQ 6 (Floppy controller) - (INT 6eh) +.equ IRQ6_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# IRQ 7 (LPT 1) - (INT 6fh) +.equ IRQ7_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# IRQ 8 (RTC Alarm) - (INT 70h) +.equ IRQ8_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# IRQ 9 - (INT 71h) +.equ IRQ9_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# IRQ 10 - (INT 72h) +.equ IRQ10_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# IRQ 11 - (INT 73h) +.equ IRQ11_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# IRQ 12 (PS/2 mouse) - (INT 74h) +.equ IRQ12_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# IRQ 13 (Floating point error) - (INT 75h) +.equ IRQ13_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# IRQ 14 (Secondary IDE) - (INT 76h) +.equ IRQ14_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +# IRQ 15 (Primary IDE) - (INT 77h) +.equ IRQ15_SEL, .-IDT_BASE + .word 0 # offset 15:0 + .word SYS_CODE_SEL # selector 15:0 + .byte 0 # 0 for interrupt gate + .byte 0x0e | 0x80 # type = 386 interrupt gate, present + .word 0 # offset 31:16 + +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 + +