| #------------------------------------------------------------------------------ |
| #* |
| #* 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. |
| #* |
| #* st16_64.asm |
| #* |
| #* 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 "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 |
| |
| CheckEm64T: |
| movl $0x80000001,%eax |
| # cpuid |
| .word 0xA20F |
| btl $29,%edx |
| jc CheckEm64TPass |
| pushw %cs |
| popw %ds |
| leaw Em64String,%si |
| movw $18,%cx |
| jmp PrintStringAndHalt |
| CheckEm64TPass: |
| 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 |
| 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 |
| |
| # 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: |
| |
| # |
| # DISABLE INTERRUPTS - Entering Protected Mode |
| # |
| |
| cli |
| |
| # mov ax,0b800h |
| # mov es,ax |
| # mov byte ptr es:[164],'c' |
| # mov ax,cs |
| # mov es,ax |
| |
| leal OffsetIn32BitProtectedMode, %eax |
| addl $0x20000+0x6,%eax |
| movl %eax, OffsetIn32BitProtectedMode |
| |
| leal OffsetInLongMode, %eax |
| addl $0x20000+0x6,%eax |
| movl %eax, OffsetInLongMode |
| |
| # |
| # load GDT |
| # |
| .byte 0x66 |
| lgdt gdtr |
| |
| # |
| # Enable Protect Mode (set CR0.PE=1) |
| # |
| movl $cr0, %eax # Read CR0. |
| orl $0x1,%eax # Set PE=1 |
| movl %eax, %cr0 # Write CR0. |
| .byte 0x66 |
| .byte 0xea # jmp far 16:32 |
| OffsetIn32BitProtectedMode: |
| .long 0x0000000 # offset $+8 (In32BitProtectedMode) |
| .word 0x10 # selector (flat CS) |
| In32BitProtectedMode: |
| |
| # |
| # Entering Long Mode |
| # |
| .byte 0x66 |
| movw $8,%ax |
| movw %ax,%ds |
| movw %ax,%es |
| movw %ax,%ss |
| |
| # |
| # Enable the 64-bit page-translation-table entries by |
| # setting CR4.PAE=1 (this is _required_ before activating |
| # long mode). Paging is not enabled until after long mode |
| # is enabled. |
| # |
| .byte 0xf |
| .byte 0x20 |
| .byte 0xe0 |
| # mov eax, cr4 |
| btsl $5,%eax |
| .byte 0xf |
| .byte 0x22 |
| .byte 0xe0 |
| # mov cr4, eax |
| |
| # |
| # This is the Trapolean Page Tables that are guarenteed |
| # under 4GB. |
| # |
| # Address Map: |
| # 10000 ~ 12000 - efildr (loaded) |
| # 20000 ~ 21000 - start64.com |
| # 21000 ~ 22000 - efi64.com |
| # 22000 ~ 90000 - efildr |
| # 90000 ~ 96000 - 4G pagetable (will be reload later) |
| # |
| .byte 0xb8 |
| .long 0x90000 |
| # mov eax, 90000h |
| movl %eax, %cr3 |
| |
| # |
| # Enable long mode (set EFER.LME=1). |
| # |
| .byte 0xb9 |
| .long 0xc0000080 |
| # mov ecx, 0c0000080h ; EFER MSR number. |
| .byte 0xf |
| .byte 0x32 |
| # rdmsr ; Read EFER. |
| .byte 0xf |
| .byte 0xba |
| .byte 0xe8 |
| .byte 0x8 |
| # bts eax, 8 ; Set LME=1. |
| .byte 0xf |
| .byte 0x30 |
| # wrmsr ; Write EFER. |
| |
| # |
| # Enable paging to activate long mode (set CR0.PG=1) |
| # |
| movl $cr0, %eax # Read CR0. |
| .byte 0xf |
| .byte 0xba |
| .byte 0xe8 |
| .byte 0x1f |
| # bts eax, 31 ; Set PG=1. |
| movl %eax, %cr0 # Write CR0. |
| jmp GoToLongMode |
| GoToLongMode: |
| |
| .byte 0x67 |
| .byte 0xea # Far Jump $+9:Selector to reload CS |
| OffsetInLongMode: |
| .long 00000000 # $+9 Offset is ensuing instruction boundary |
| .word 0x38 # Selector is our code selector, 38h |
| |
| InLongMode: |
| .byte 0x66 |
| movw $0x30,%ax |
| movw %ax,%ds |
| |
| .byte 0x66 |
| movw $0x18,%ax |
| movw %ax,%es |
| movw %ax,%ss |
| movw %ax,%ds |
| |
| .byte 0xbd |
| .long 0x400000 |
| # mov ebp,000400000h ; Destination of EFILDR32 |
| .byte 0xbb |
| .long 0x70000 |
| # mov ebx,000070000h ; Length of copy |
| |
| # |
| # load idt later |
| # |
| .byte 0x48 |
| .byte 0x33 |
| .byte 0xc0 |
| # xor rax, rax |
| .byte 0x66 |
| movw $idtr, %ax |
| .byte 0x48 |
| .byte 0x5 |
| .long 0x20000 |
| # add rax, 20000h |
| |
| .byte 0xf |
| .byte 0x1 |
| .byte 0x18 |
| # lidt fword ptr [rax] |
| |
| .byte 0x48 |
| .byte 0xc7 |
| .byte 0xc0 |
| .long 0x21000 |
| # mov rax, 21000h |
| .byte 0x50 |
| # push rax |
| |
| # ret |
| .byte 0xc3 |
| |
| 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: .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 # Selector [0x0] |
| .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 # Selector [0x8] |
| .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 # Selector [0x10] |
| .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 # Selector [0x18] |
| .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 # Selector [0x20] |
| .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 # Selector [0x28] |
| .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 |
| |
| # |
| # system data segment descriptor |
| # |
| .equ SYS_DATA64_SEL, .-GDT_BASE # Selector [0x30] |
| .word 0xFFFF # limit 0xFFFFF |
| .word 0 # base 0 |
| .byte 0 |
| .byte 0x92 # P | DPL [1..2] | 1 | 1 | C | R | A |
| .byte 0xCF # G | D | L | AVL | Segment [19..16] |
| .byte 0 |
| |
| # |
| # system code segment descriptor |
| # |
| .equ SYS_CODE64_SEL, .-GDT_BASE # Selector [0x38] |
| .word 0xFFFF # limit 0xFFFFF |
| .word 0 # base 0 |
| .byte 0 |
| .byte 0x9A # P | DPL [1..2] | 1 | 1 | C | R | A |
| .byte 0xAF # G | D | L | AVL | Segment [19..16] |
| .byte 0 |
| |
| # spare segment descriptor |
| .equ SPARE4_SEL, .-GDT_BASE # Selector [0x40] |
| .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 |
| .quad 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_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # debug exception (INT 1) |
| .equ DEBUG_EXCEPT_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # NMI (INT 2) |
| .equ NMI_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # soft breakpoint (INT 3) |
| .equ BREAKPOINT_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # overflow (INT 4) |
| .equ OVERFLOW_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # bounds check (INT 5) |
| .equ BOUNDS_CHECK_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # invalid opcode (INT 6) |
| .equ INVALID_OPCODE_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # device not available (INT 7) |
| .equ DEV_NOT_AVAIL_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # double fault (INT 8) |
| .equ DOUBLE_FAULT_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # Coprocessor segment overrun - reserved (INT 9) |
| .equ RSVD_INTR_SEL1, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # invalid TSS (INT 0ah) |
| .equ INVALID_TSS_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # segment not present (INT 0bh) |
| .equ SEG_NOT_PRESENT_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # stack fault (INT 0ch) |
| .equ STACK_FAULT_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # general protection (INT 0dh) |
| .equ GP_FAULT_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # page fault (INT 0eh) |
| .equ PAGE_FAULT_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # Intel reserved - do not use (INT 0fh) |
| .equ RSVD_INTR_SEL2, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # floating point error (INT 10h) |
| .equ FLT_POINT_ERR_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # alignment check (INT 11h) |
| .equ ALIGNMENT_CHECK_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # machine check (INT 12h) |
| .equ MACHINE_CHECK_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # SIMD floating-point exception (INT 13h) |
| .equ SIMD_EXCEPTION_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # 85 unspecified descriptors, First 12 of them are reserved, the rest are avail |
| .fill 85 * 16, 1, 0 # db (85 * 16) dup(0) |
| |
| # IRQ 0 (System timer) - (INT 68h) |
| .equ IRQ0_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # IRQ 1 (8042 Keyboard controller) - (INT 69h) |
| .equ IRQ1_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah) |
| .equ IRQ2_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # IRQ 3 (COM 2) - (INT 6bh) |
| .equ IRQ3_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # IRQ 4 (COM 1) - (INT 6ch) |
| .equ IRQ4_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # IRQ 5 (LPT 2) - (INT 6dh) |
| .equ IRQ5_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # IRQ 6 (Floppy controller) - (INT 6eh) |
| .equ IRQ6_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # IRQ 7 (LPT 1) - (INT 6fh) |
| .equ IRQ7_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # IRQ 8 (RTC Alarm) - (INT 70h) |
| .equ IRQ8_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # IRQ 9 - (INT 71h) |
| .equ IRQ9_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # IRQ 10 - (INT 72h) |
| .equ IRQ10_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # IRQ 11 - (INT 73h) |
| .equ IRQ11_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # IRQ 12 (PS/2 mouse) - (INT 74h) |
| .equ IRQ12_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # IRQ 13 (Floating point error) - (INT 75h) |
| .equ IRQ13_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # IRQ 14 (Secondary IDE) - (INT 76h) |
| .equ IRQ14_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| # IRQ 15 (Primary IDE) - (INT 77h) |
| .equ IRQ15_SEL, .-IDT_BASE |
| .word 0 # offset 15:0 |
| .long SYS_CODE64_SEL # selector 15:0 |
| .byte 0 # 0 for interrupt gate |
| .byte 0x0e | 0x80 # type = 386 interrupt gate, present |
| .word 0 # offset 31:16 |
| .long 0 # offset 63:32 |
| .long 0 # 0 for reserved |
| |
| 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 #Just for pass build |
| 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 #Just for pass build |
| BlockSignature: |
| .word 0xaa55 |
| |