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CloverBootloader/CloverEFI/BootSector/start32H.S

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initial commit Clover sources 5061 and modules from EDK2 latest with legacy codes from UDK2018 Signed-off-by: Sergey Isakov <isakov-sl@bk.ru>
2019-09-03 11:58:42 +02:00
#------------------------------------------------------------------------------
#*
#* Copyright (c) 2006 - 2007, Intel Corporation. All rights reserved.<BR>
#* This program and the accompanying materials
#* are licensed and made available under the terms and conditions of the BSD License
#* which accompanies this distribution. The full text of the license may be found at
#* http://opensource.org/licenses/bsd-license.php
#*
#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#*
#* start32.asm
#*
#* Abstract:
#*
#------------------------------------------------------------------------------
#define data32 .byte 0x66
#define addr32 .byte 0x67
#.MODEL small
.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 - 2 bytes
SectorsPerCluster: .byte 0 # Sector Per Cluster - 1 byte
ReservedSectors: .word 0 # Reserved Sectors - 2 bytes
NoFats: .byte 0 # Number of FATs - 1 byte
RootEntries: .word 0 # Root Entries - 2 bytes
Sectors: .word 0 # Number of Sectors - 2 bytes
Media: .byte 0 # Media - 1 byte
SectorsPerFat16: .word 0 # Sectors Per FAT for FAT12/FAT16 - 2 byte
SectorsPerTrack: .word 0 # Sectors Per Track - 2 bytes
Heads: .word 0 # Heads - 2 bytes
HiddenSectors: .long 0 # Hidden Sectors - 4 bytes
LargeSectors: .long 0 # Large Sectors - 4 bytes
#******************************************************************************
#
#The structure for FAT32 starting at offset 36 of the boot sector. (At this point,
#the BPB/boot sector for FAT12 and FAT16 differs from the BPB/boot sector for FAT32.)
#
#******************************************************************************
SectorsPerFat32: .long 0 # Sectors Per FAT for FAT32 - 4 bytes
ExtFlags: .word 0 # Mirror Flag - 2 bytes
FSVersion: .word 0 # File System Version - 2 bytes
RootCluster: .long 0 # 1st Cluster Number of Root Dir - 4 bytes
FSInfo: .word 0 # Sector Number of FSINFO - 2 bytes
BkBootSector: .word 0 # Sector Number of Bk BootSector - 2 bytes
Reserved: .fill 12,1,0 # Reserved Field - 12 bytes
PhysicalDrive: .byte 0 # Physical Drive Number - 1 byte
Reserved1: .byte 0 # Reserved Field - 1 byte
Signature: .byte 0 # Extended Boot Signature - 1 byte
VolId: .ascii " " # Volume Serial Number - 4 bytes
FatLabel: .ascii "Clover " # Volume Label - 11 bytes
FileSystemType: .ascii "HFSPlus " # File System Type - 8 bytes
BootSectorEntryPoint:
#ASSUME ds:@code
#ASSUME ss:@code
# ds = 1000, es = 2000 + x (size of first cluster >> 4)
# cx = Start Cluster of EfiLdr
# dx = Start Cluster of Efivar.bin
# Re use the BPB data stored in Boot Sector
movw $0x7c00, %bp
JumpFarInstruction:
.byte 0xea
JumpOffset:
.word 0x200
JumpSegment:
.word 0x2000
/*
PrintStringAndHalt:
movw $0xb800, %ax
movw %ax, %es
movw $160, %di
rep
movsw
Halt:
jmp Halt
ErrorString:
.byte 'S', 0x0c, 'E', 0x0c, 'r', 0x0c, 'r', 0x0c, 'o', 0x0c, 'r', 0x0c, '!', 0x0c
*/
.org 0x01fa # Will cause build break
LBAOffsetForBootSector:
.long 0x0
.org 0x01fe # Will cause build break
.word 0xaa55
#******************************************************************************
#******************************************************************************
#******************************************************************************
.equ DELAY_PORT, 0x0ed # Port to use for 1uS delay
.equ KBD_CONTROL_PORT, 0x060 # 8042 control port
.equ KBD_STATUS_PORT, 0x064 # 8042 status port
.equ WRITE_DATA_PORT_CMD, 0x0d1 # 8042 command to write the data port
.equ ENABLE_A20_CMD, 0x0df # 8042 command to enable A20
.org 0x200 # Will cause build break
.code16
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
Label: .ascii "Clover " # Bootloader Label
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
# movw $0xb800, %ax
# movw %ax, %es
# movw $0x61, byte ptr %es:[160]
# movw %cs, %ax
# movw %ax, %es
//advanced algo
/*
; use the INT 0x15, eax= 0xE820 BIOS function to get a memory map
; inputs: es:di -> destination buffer for 24 byte entries
; outputs: bp = entry count, trashes all registers except esi
do_e820:
xor ebx, ebx ; ebx must be 0 to start
xor bp, bp ; keep an entry count in bp
mov edx, 0x0534D4150 ; Place "SMAP" into edx
mov eax, 0xe820
mov [es:di + 20], dword 1 ; force a valid ACPI 3.X entry
mov ecx, 24 ; ask for 24 bytes
int 0x15
jc short .failed ; carry set on first call means "unsupported function"
mov edx, 0x0534D4150 ; Some BIOSes apparently trash this register?
cmp eax, edx ; on success, eax must have been reset to "SMAP"
jne short .failed
test ebx, ebx ; ebx = 0 implies list is only 1 entry long (worthless)
je short .failed
jmp short .jmpin
.e820lp:
mov eax, 0xe820 ; eax, ecx get trashed on every int 0x15 call
mov [es:di + 20], dword 1 ; force a valid ACPI 3.X entry
mov ecx, 24 ; ask for 24 bytes again
int 0x15
jc short .e820f ; carry set means "end of list already reached"
mov edx, 0x0534D4150 ; repair potentially trashed register
.jmpin:
jcxz .skipent ; skip any 0 length entries
cmp cl, 20 ; got a 24 byte ACPI 3.X response?
jbe short .notext
test byte [es:di + 20], 1 ; if so: is the "ignore this data" bit clear?
je short .skipent
.notext:
mov ecx, [es:di + 8] ; get lower dword of memory region length
or ecx, [es:di + 12] ; "or" it with upper dword to test for zero
jz .skipent ; if length qword is 0, skip entry
inc bp ; got a good entry: ++count, move to next storage spot
add di, 24
.skipent:
test ebx, ebx ; if ebx resets to 0, list is complete
jne short .e820lp
.e820f:
mov [mmap_ent], bp ; store the entry count
clc ; there is "jc" on end of list to this point, so the carry must be cleared
ret
.failed:
stc ; "function unsupported" error exit
ret
*/
/* xorl %ebx, %ebx
xorl %ebp, %ebp
movl $0x534d4150, %edx # 0x534d4150 = 'SMAP'
movl $0xe820, %eax
leal MemoryMap, %edi
movl $1, %es:20(%di)
movl $24, %ecx
int $0x15
jc MemMapDone
movl $0x534d4150, %edx
cmpl %edx, %eax
jne MemMapDone
testl %ebx, %ebx
je MemMapDone
jmp JumpIn
MemMapLoop:
movl $0xe820, %eax
movl $1, %es:20(%di)
int $0x15
jc MemMapDone
movl $0x534d4150, %edx
JumpIn:
jcxz SkipEntry
cmpb $20, %cl
jbe NoText
# movl 20(%edi), %eax
testb $1, 20(%edi)
je SkipEntry
NoText:
movl %es:8(%di), %ecx
orl %es:12(%di), %ecx
jz SkipEntry
incl %ebp
addl $24, %edi
SkipEntry:
test %ebx, %ebx
jne MemMapLoop
MemMapDone:
movl %ebp, MemoryMapSize
clc
*/
movl $0, %ebx
leal MemoryMap, %edi
MemMapLoop:
movl $0xe820, %eax
movl $20, %ecx #WIKI said $24
movl $0x534d4150, %edx # 0x534d4150 = 'SMAP'
int $0x15
jc MemMapDone
addl $20, %edi
cmpl $0, %ebx
je MemMapDone
jmp MemMapLoop
MemMapDone:
leal MemoryMap, %eax
subl %eax, %edi # Get the address of the memory map
movl %edi, MemoryMapSize # Save the size of the memory map
xorl %ebx, %ebx
movw %cs, %bx # BX=segment
shll $4, %ebx # BX="linear" address of segment base
leal GDT_BASE(%ebx), %eax # EAX=PHYSICAL address of gdt
movl %eax, gdtr + 2 # Put address of gdt into the gdtr
leal IDT_BASE(%ebx), %eax # EAX=PHYSICAL address of idt
movl %eax, idtr + 2 # Put address of idt into the idtr
leal MemoryMapSize(%ebx), %edx # Physical base address of the memory map
addl $0x1000, %ebx # Source of EFI32 = $0x21000
movl %ebx, JUMP+2
addl $0x1000, %ebx
movl %ebx, %esi # Source of EFILDR32 = $0x22000
# mov ax,0b800h
# mov es,ax
# mov byte ptr es:[162],'b'
# mov ax,cs
# mov es,ax
# movw $0xb800, %ax
# movw %ax, %es
# movw $0x62, byte ptr %es:[162]
# movw %cs, %ax
# movw %ax, %es
#
# Enable A20 Gate
#
movw $0x2401, %ax # Enable A20 Gate
int $0x15
jnc A20GateEnabled # Jump if it succeeded
#
# If INT 15 Function 2401 is not supported, then attempt to Enable A20 manually.
#
#New algo from WIKI
/* cli
call a20wait
movb $0xAD, %al
outb %al, $KBD_STATUS_PORT
call a20wait
movb $0xD0, %al
outb %al, $KBD_STATUS_PORT
call a20wait2
inb $KBD_CONTROL_PORT, %al
pushl %eax
call a20wait
movb $0xD1, %al
outb %al, $KBD_STATUS_PORT
call a20wait
popl %eax
orb $2, %al
outb %al, $KBD_CONTROL_PORT
call a20wait
movb $0xAE, %al
outb %al, $KBD_STATUS_PORT
call a20wait
*/
#UEFI/DUET
call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
jnz Timeout8042 # Jump if the 8042 timed out
outw %ax, $DELAY_PORT # Delay 1 uS
movb $WRITE_DATA_PORT_CMD, %al # 8042 cmd to write output port
outb %al, $KBD_STATUS_PORT # Send command to the 8042
call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
jnz Timeout8042 # Jump if the 8042 timed out
movb $ENABLE_A20_CMD, %al # gate address bit 20 on
outb %al, $KBD_CONTROL_PORT # Send command to thre 8042
call Empty8042InputBuffer # Empty the Input Buffer on the 8042 controller
movw $25, %cx # Delay 25 uS for the command to complete on the 8042
Delay25uS:
outw %ax, $DELAY_PORT # Delay 1 uS
loopl Delay25uS
Timeout8042:
#WIKI -fast A20gate
# inb $0x92, %al
# orb $2, %al
# outb %al, $0x92
A20GateEnabled:
#//Slice - switch to graphics mode (1), or 80x25 mono text mode (2)
movw $0x0002, %ax
int $0x10
#put char 6
movl $0x000F, %ebx
movl $0x0E33, %eax
movl $0x0010, %ecx
int $0x10
movw $0x0008, %bx # Flat data descriptor
#PAUSE1:
# jmp PAUSE1
#
# DISABLE INTERRUPTS - Entering Protected Mode
#
cli
.byte 0x66
lgdt gdtr
#PAUSE2:
# jmp PAUSE2
# addr32
data32
lidt idtr
#PAUSE3:
# jmp PAUSE3
movl %cr0, %eax
orb $1, %al
# data32
# or $1, %eax
movl %eax, %cr0
JUMP:
# jmp far 0010:00020000
data32
.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
/*
a20wait:
inb $KBD_STATUS_PORT, %al
testb $2, %al
jnz a20wait
ret
a20wait2:
inb $KBD_STATUS_PORT, %al
testb $1, %al
jz a20wait2
ret
*/
/*
PrintStringAndHalt:
leaw ErrorString, %si
movw $7, %cx
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
*/
##############################################################################
# data
##############################################################################
.p2align 1
gdtr: .word GDT_END - GDT_BASE - 1
.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
.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 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# debug exception (INT 1)
.equ DEBUG_EXCEPT_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# NMI (INT 2)
.equ NMI_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# soft breakpoint (INT 3)
.equ BREAKPOINT_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# overflow (INT 4)
.equ OVERFLOW_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# bounds check (INT 5)
.equ BOUNDS_CHECK_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# invalid opcode (INT 6)
.equ INVALID_OPCODE_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# device not available (INT 7)
.equ DEV_NOT_AVAIL_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# double fault (INT 8)
.equ DOUBLE_FAULT_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# Coprocessor segment overrun - reserved (INT 9)
.equ RSVD_INTR_SEL1, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# invalid TSS (INT 0ah)
.equ INVALID_TSS_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# segment not present (INT 0bh)
.equ SEG_NOT_PRESENT_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# stack fault (INT 0ch)
.equ STACK_FAULT_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# general protection (INT 0dh)
.equ GP_FAULT_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# page fault (INT 0eh)
.equ PAGE_FAULT_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# Intel reserved - do not use (INT 0fh)
.equ RSVD_INTR_SEL2, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# floating point error (INT 10h)
.equ FLT_POINT_ERR_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# alignment check (INT 11h)
.equ ALIGNMENT_CHECK_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# machine check (INT 12h)
.equ MACHINE_CHECK_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# SIMD floating-point exception (INT 13h)
.equ SIMD_EXCEPTION_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# 84 unspecified descriptors, First 12 of them are reserved, the rest are avail
.fill 84 * 8, 1, 0
# IRQ 0 (System timer) - (INT 68h)
.equ IRQ0_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# IRQ 1 (8042 Keyboard controller) - (INT 69h)
.equ IRQ1_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah)
.equ IRQ2_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# IRQ 3 (COM 2) - (INT 6bh)
.equ IRQ3_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# IRQ 4 (COM 1) - (INT 6ch)
.equ IRQ4_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# IRQ 5 (LPT 2) - (INT 6dh)
.equ IRQ5_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# IRQ 6 (Floppy controller) - (INT 6eh)
.equ IRQ6_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# IRQ 7 (LPT 1) - (INT 6fh)
.equ IRQ7_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# IRQ 8 (RTC Alarm) - (INT 70h)
.equ IRQ8_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# IRQ 9 - (INT 71h)
.equ IRQ9_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# IRQ 10 - (INT 72h)
.equ IRQ10_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# IRQ 11 - (INT 73h)
.equ IRQ11_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# IRQ 12 (PS/2 mouse) - (INT 74h)
.equ IRQ12_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# IRQ 13 (Floating point error) - (INT 75h)
.equ IRQ13_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# IRQ 14 (Secondary IDE) - (INT 76h)
.equ IRQ14_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
# IRQ 15 (Primary IDE) - (INT 77h)
.equ IRQ15_SEL, .-IDT_BASE
.word 0 # offset 15:0
.word SYS_CODE_SEL # selector 15:0
.byte 0 # 0 for interrupt gate
.byte 0x0e | 0x80 # type = 386 interrupt gate, present
.word 0 # offset 31:16
.fill 8, 1, 0
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
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