X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=blobdiff_plain;f=DuetPkg%2FBootSector%2Fstart16.S;fp=DuetPkg%2FBootSector%2Fstart16.S;h=0000000000000000000000000000000000000000;hp=a4cb151c77007dbe2f63b59cda994b09b8a2b23a;hb=9fb5c5c4a33248764b24cb710b56d6c32ce237b4;hpb=8efc6d84ca41e692cc60702e1f27276f7883b6db diff --git a/DuetPkg/BootSector/start16.S b/DuetPkg/BootSector/start16.S deleted file mode 100644 index a4cb151c77..0000000000 --- a/DuetPkg/BootSector/start16.S +++ /dev/null @@ -1,910 +0,0 @@ -#------------------------------------------------------------------------------ -#* -#* Copyright (c) 2006 - 2011, 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. -#* -#* start16.asm -#* -#* Abstract: -#* -#------------------------------------------------------------------------------ - - #.MODEL small - .stack: - .486p: - .code16 - -.equ FAT_DIRECTORY_ENTRY_SIZE, 0x0020 -.equ FAT_DIRECTORY_ENTRY_SHIFT, 5 -.equ BLOCK_SIZE, 0x0200 -.equ BLOCK_MASK, 0x01ff -.equ BLOCK_SHIFT, 9 - - .org 0x00 - -.global _start -_start: - -Ia32Jump: - jmp BootSectorEntryPoint # JMP inst - 3 bytes - nop - -OemId: .ascii "INTEL " # OemId - 8 bytes - -SectorSize: .word 0 # Sector Size - 16 bits -SectorsPerCluster: .byte 0 # Sector Per Cluster - 8 bits -ReservedSectors: .word 0 # Reserved Sectors - 16 bits -NoFats: .byte 0 # Number of FATs - 8 bits -RootEntries: .word 0 # Root Entries - 16 bits -Sectors: .word 0 # Number of Sectors - 16 bits -Media: .byte 0 # Media - 8 bits - ignored -SectorsPerFat: .word 0 # Sectors Per FAT - 16 bits -SectorsPerTrack: .word 0 # Sectors Per Track - 16 bits - ignored -Heads: .word 0 # Heads - 16 bits - ignored -HiddenSectors: .long 0 # Hidden Sectors - 32 bits - ignored -LargeSectors: .long 0 # Large Sectors - 32 bits -PhysicalDrive: .byte 0 # PhysicalDriveNumber - 8 bits - ignored -CurrentHead: .byte 0 # Current Head - 8 bits -Signature: .byte 0 # Signature - 8 bits - ignored -VolId: .ascii " " # Volume Serial Number- 4 bytes -FatLabel: .ascii " " # Label - 11 bytes -SystemId: .ascii "FAT16 " # SystemId - 8 bytes - -BootSectorEntryPoint: - #ASSUME ds:@code - #ASSUME ss:@code - # ds = 1000, es = 2000 + x (size of first cluster >> 4) - # cx = Start Cluster of EfiLdr - # dx = Start Cluster of Efivar.bin - -# Re use the BPB data stored in Boot Sector - movw $0x7c00, %bp - - pushw %cx -# Read Efivar.bin -# 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already - movw $0x1900, %ax - movw %ax, %es - testw %dx, %dx - jnz CheckVarStoreSize - - movb $1, %al -NoVarStore: - pushw %es -# Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl - movb %al, %es:4 - jmp SaveVolumeId - -CheckVarStoreSize: - movw %dx, %di - cmpl $0x4000, %ds:2(%di) - movb $2, %al - jne NoVarStore - -LoadVarStore: - movb $0, %al - movb %al, %es:4 - movw (%di), %cx -# ES:DI = 1500:0 - xorw %di, %di - pushw %es - movw $0x1500, %ax - movw %ax, %es - call ReadFile -SaveVolumeId: - popw %es - movw VolId(%bp), %ax - movw %ax, %es:0 # 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 %ax # FatOffset = ClusterNumber * 2 - pushw %si # Save si - movw %ax, %si # si = FatOffset - shrw $BLOCK_SHIFT, %ax # ax = FatOffset >> BLOCK_SHIFT - addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET) - andw $BLOCK_MASK, %si # si = FatOffset & BLOCK_MASK - cmpw %dx, %ax # Compare FatSectorNumber to CachedFatSectorNumber - je SkipFatRead - movw $2, %bx - pushw %es - pushw %ds - popw %es - call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI - popw %es - movw %ax, %dx # CachedFatSectorNumber = FatSectorNumber -SkipFatRead: - movw (%si), %bx # bx = NextClusterNumber - movw %cx, %ax # ax = ClusterNumber - popw %si # Restore si - decw %bx # bx = NextClusterNumber - 1 - cmpw %cx, %bx # See if (NextClusterNumber-1)==ClusterNumber - jne ReadClusters - incw %bx # bx = NextClusterNumber - incw %si # NumberOfClusters++ - movw %bx, %cx # ClusterNumber = NextClusterNumber - jmp FatChainLoop -ReadClusters: - incw %bx - popw %ax # ax = StartCluster - pushw %bx # StartCluster = NextClusterNumber - movw %bx, %cx # ClusterNumber = NextClusterNumber - subw $2, %ax # ax = StartCluster - 2 - xorb %bh, %bh - movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster - mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster - addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster - pushw %ax # save start sector - movw %si, %ax # ax = NumberOfClusters - mulw %bx # ax = NumberOfClusters * SectorsPerCluster - movw %ax, %bx # bx = Number of Sectors - popw %ax # ax = Start Sector - call ReadBlocks - movw $1, %si # NumberOfClusters = 1 - jmp FatChainLoop -FoundLastCluster: - popw %cx - popa - ret - - -# **************************************************************************** -# ReadBlocks - Reads a set of blocks from a block device -# -# AX = Start LBA -# BX = Number of Blocks to Read -# ES:DI = Buffer to store sectors read from disk -# **************************************************************************** - -# cx = Blocks -# bx = NumberOfBlocks -# si = StartLBA - -ReadBlocks: - pusha - 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 # Just for passing build. -LBAOffsetForBootSector: - .long 0x0 - - # .org 0x01fe # Just for passing build. - .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 0x0200 # Just for passing build. - 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 stands for '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 - loop Delay25uS -Timeout8042: - - -A20GateEnabled: - movw $0x0008, %bx # Flat data descriptor -# -# 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 -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 -############################################################################## - - .p2align 1 - -gdtr: .word GDT_END - GDT_BASE - 1 # GDT limit - .long 0 # (GDT base gets set above) -############################################################################## -# global descriptor table (GDT) -############################################################################## - - .p2align 1 - -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: - - .p2align 1 - - - -idtr: .word IDT_END - IDT_BASE - 1 # IDT limit - .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 - .p2align 1 - -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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)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 # (10001110)type = 386 interrupt gate, present - .word 0 # offset 31:16 - -IDT_END: - - .p2align 1 - -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