| #------------------------------------------------------------------------------ | |
| #* | |
| #* 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. | |
| #* | |
| #* start.S | |
| #* | |
| #* Abstract: | |
| #* | |
| #------------------------------------------------------------------------------ | |
| .stack: | |
| .486p: | |
| .code16 | |
| .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 - 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 "FAT12 " # SystemId - 8 bytes | |
| BootSectorEntryPoint: | |
| #ASSUME ds:@code | |
| #ASSUME ss:@code | |
| # ds = 1000, es = 2000 + x (size of first cluster >> 4) | |
| # cx = Start Cluster of EfiLdr | |
| # dx = Start Cluster of Efivar.bin | |
| # Re use the BPB data stored in Boot Sector | |
| movw $0x7c00, %bp | |
| pushw %cx | |
| # Read Efivar.bin | |
| # 1000:dx = DirectoryEntry of Efivar.bin -> BS.com has filled already | |
| movw $0x1900, %ax | |
| movw %ax, %es | |
| testw %dx, %dx | |
| jnz CheckVarStoreSize | |
| movb $1, %al | |
| NoVarStore: | |
| pushw %es | |
| # Set the 5th byte start @ 0:19000 to non-zero indicating we should init var store header in DxeIpl | |
| movb %al, %es:(4) | |
| jmp SaveVolumeId | |
| CheckVarStoreSize: | |
| movw %dx, %di | |
| cmpl $0x4000, %ds:2(%di) | |
| movb $2, %al | |
| jne NoVarStore | |
| LoadVarStore: | |
| movb $0, %al | |
| movb %al, %es:(4) | |
| movw (%di), %cx | |
| # ES:DI = 1500:0 | |
| xorw %di, %di | |
| pushw %es | |
| movw $0x1500, %ax | |
| movw %ax, %es | |
| call ReadFile | |
| SaveVolumeId: | |
| popw %es | |
| movw VolId(%bp), %ax | |
| movw %ax, %es:(0) # 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 $0xff8, %ax # ax = ax & 0xff8 | |
| cmpw $0xff8, %ax # See if this is the last cluster | |
| je FoundLastCluster # Jump if last cluster found | |
| movw %cx, %ax # ax = ClusterNumber | |
| shlw %ax # ax = ClusterNumber * 2 | |
| addw %cx, %ax # ax = ClusterNumber * 2 + ClusterNumber = ClusterNumber * 3 | |
| shrw %ax # FatOffset = ClusterNumber*3 / 2 | |
| pushw %si # Save si | |
| movw %ax, %si # si = FatOffset | |
| shrw $BLOCK_SHIFT, %ax # ax = FatOffset >> BLOCK_SHIFT | |
| addw ReservedSectors(%bp), %ax # ax = FatSectorNumber = ReservedSectors + (FatOffset >> BLOCK_OFFSET) | |
| andw $BLOCK_MASK,%si # si = FatOffset & BLOCK_MASK | |
| cmpw %dx, %ax # Compare FatSectorNumber to CachedFatSectorNumber | |
| je SkipFatRead | |
| movw $2, %bx | |
| pushw %es | |
| pushw %ds | |
| popw %es | |
| call ReadBlocks # Read 2 blocks starting at AX storing at ES:DI | |
| popw %es | |
| movw %ax, %dx # CachedFatSectorNumber = FatSectorNumber | |
| SkipFatRead: | |
| movw (%si), %bx # bx = NextClusterNumber | |
| movw %cx, %ax # ax = ClusterNumber | |
| andw $1, %ax # See if this is an odd cluster number | |
| je EvenFatEntry | |
| shrw $4, %bx # NextClusterNumber = NextClusterNumber >> 4 | |
| EvenFatEntry: | |
| andw $0xfff, %bx # Strip upper 4 bits of NextClusterNumber | |
| popw %si # Restore si | |
| decw %bx # bx = NextClusterNumber - 1 | |
| cmpw %cx, %bx # See if (NextClusterNumber-1)==ClusterNumber | |
| jne ReadClusters | |
| incw %bx # bx = NextClusterNumber | |
| incw %si # NumberOfClusters++ | |
| movw %bx, %cx # ClusterNumber = NextClusterNumber | |
| jmp FatChainLoop | |
| ReadClusters: | |
| incw %bx | |
| popw %ax # ax = StartCluster | |
| pushw %bx # StartCluster = NextClusterNumber | |
| movw %bx, %cx # ClusterNumber = NextClusterNumber | |
| subw $2, %ax # ax = StartCluster - 2 | |
| xorb %bh, %bh | |
| movb SectorsPerCluster(%bp), %bl # bx = SectorsPerCluster | |
| mulw %bx # ax = (StartCluster - 2) * SectorsPerCluster | |
| addw (%bp), %ax # ax = FirstClusterLBA + (StartCluster-2)*SectorsPerCluster | |
| pushw %ax # save start sector | |
| movw %si, %ax # ax = NumberOfClusters | |
| mulw %bx # ax = NumberOfClusters * SectorsPerCluster | |
| movw %ax, %bx # bx = Number of Sectors | |
| popw %ax # ax = Start Sector | |
| call ReadBlocks | |
| movw $1, %si # NumberOfClusters = 1 | |
| jmp FatChainLoop | |
| FoundLastCluster: | |
| popw %cx | |
| popa | |
| ret | |
| # **************************************************************************** | |
| # ReadBlocks - Reads a set of blocks from a block device | |
| # | |
| # AX = Start LBA | |
| # BX = Number of Blocks to Read | |
| # ES:DI = Buffer to store sectors read from disk | |
| # **************************************************************************** | |
| # cx = Blocks | |
| # bx = NumberOfBlocks | |
| # si = StartLBA | |
| ReadBlocks: | |
| pusha | |
| 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 | |
| LBAOffsetForBootSector: | |
| .long 0x0 | |
| .org 0x01fe | |
| .word 0xaa55 | |
| #****************************************************************************** | |
| #****************************************************************************** | |
| #****************************************************************************** | |
| .equ DELAY_PORT, 0x0ed # Port to use for 1uS delay | |
| .equ KBD_CONTROL_PORT, 0x060 # 8042 control port | |
| .equ KBD_STATUS_PORT, 0x064 # 8042 status port | |
| .equ WRITE_DATA_PORT_CMD, 0x0d1 # 8042 command to write the data port | |
| .equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20 | |
| .org 0x200 | |
| jmp start | |
| Em64String: | |
| .byte 'E', 0x0c, 'm', 0x0c, '6', 0x0c, '4', 0x0c, 'T', 0x0c, ' ', 0x0c, 'U', 0x0c, 'n', 0x0c, 's', 0x0c, 'u', 0x0c, 'p', 0x0c, 'p', 0x0c, 'o', 0x0c, 'r', 0x0c, 't', 0x0c, 'e', 0x0c, 'd', 0x0c, '!', 0x0c | |
| start: | |
| movw %cs, %ax | |
| movw %ax, %ds | |
| movw %ax, %es | |
| movw %ax, %ss | |
| movw $MyStack, %sp | |
| # mov ax,0b800h | |
| # mov es,ax | |
| # mov byte ptr es:[160],'a' | |
| # mov ax,cs | |
| # mov es,ax | |
| movl $0, %ebx | |
| leal MemoryMap, %edi | |
| MemMapLoop: | |
| movl $0xe820, %eax | |
| movl $20, %ecx | |
| movl $0x534d4150, %edx # SMAP | |
| int $0x15 | |
| jc MemMapDone | |
| addl $20, %edi | |
| cmpl $0, %ebx | |
| je MemMapDone | |
| jmp MemMapLoop | |
| MemMapDone: | |
| leal MemoryMap, %eax | |
| subl %eax, %edi # Get the address of the memory map | |
| movl %edi, MemoryMapSize # Save the size of the memory map | |
| xorl %ebx, %ebx | |
| movw %cs, %bx # BX=segment | |
| shll $4, %ebx # BX="linear" address of segment base | |
| 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 | |
| mov $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port | |
| out %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 | |
| mov $ENABLE_A20_CMD, %al # gate address bit 20 on | |
| out %al, $KBD_CONTROL_PORT # Send command to thre 8042 | |
| call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller | |
| movw $25, %cx # Delay 25 uS for the command to complete on the 8042 | |
| Delay25uS: | |
| outw %ax, $DELAY_PORT # Delay 1 uS | |
| loop Delay25uS | |
| Timeout8042: | |
| A20GateEnabled: | |
| # | |
| # DISABLE INTERRUPTS - Entering Protected Mode | |
| # | |
| cli | |
| # mov ax,0b800h | |
| # mov es,ax | |
| # mov byte ptr es:[164],'c' | |
| # mov ax,cs | |
| # mov es,ax | |
| .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 | |
| in $KBD_STATUS_PORT, %al # Read the 8042 Status Port | |
| andb $0x2, %al # Check the Input Buffer Full Flag | |
| loopnz Empty8042Loop # Loop until the input buffer is empty or a timout of 65536 uS | |
| ret | |
| ############################################################################## | |
| # data | |
| ############################################################################## | |
| .align 0x2 | |
| gdtr: .long GDT_END - GDT_BASE - 1 # GDT limit | |
| .long 0 # (GDT base gets set above) | |
| ############################################################################## | |
| # global descriptor table (GDT) | |
| ############################################################################## | |
| .align 0x2 | |
| GDT_BASE: | |
| # null descriptor | |
| .equ NULL_SEL, .-GDT_BASE | |
| .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: .long 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 | |
| .align 0x2 | |
| IDT_BASE: | |
| # divide by zero (INT 0) | |
| .equ DIV_ZERO_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 | |
| .long 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 | |
| .long 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 | |
| .long 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 | |
| .long 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 | |
| .long 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 | |
| .long 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 | |
| .long 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 | |
| .long 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 | |
| .long 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 0x0a) | |
| .equ INVALID_TSS_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x0b) | |
| .equ SEG_NOT_PRESENT_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x0c) | |
| .equ STACK_FAULT_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x0d) | |
| .equ GP_FAULT_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x0e) | |
| .equ PAGE_FAULT_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x0f) | |
| .equ RSVD_INTR_SEL2, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x10) | |
| .equ FLT_POINT_ERR_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x11) | |
| .equ ALIGNMENT_CHECK_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x12) | |
| .equ MACHINE_CHECK_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x13) | |
| .equ SIMD_EXCEPTION_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 # db (85 * 8) dup(0) | |
| # IRQ 0 (System timer) - (INT 0x68) | |
| .equ IRQ0_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x69) | |
| .equ IRQ1_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x6a) | |
| .equ IRQ2_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x6b) | |
| .equ IRQ3_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x6c) | |
| .equ IRQ4_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x6d) | |
| .equ IRQ5_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x6e) | |
| .equ IRQ6_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x6f) | |
| .equ IRQ7_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x70) | |
| .equ IRQ8_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x71) | |
| .equ IRQ9_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x72) | |
| .equ IRQ10_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x73) | |
| .equ IRQ11_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x74) | |
| .equ IRQ12_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x75) | |
| .equ IRQ13_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x76) | |
| .equ IRQ14_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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 0x77) | |
| .equ IRQ15_SEL, .-IDT_BASE | |
| .word 0 # offset 15:0 | |
| .long 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: | |
| .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 | |