| #------------------------------------------------------------------------------
|
| #*
|
| #* 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 |
| |
| .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 "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
|
|
|
|
|
