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CloverBootloader/CloverEFI/CpuDxe/Ia32/CpuInterrupt.nasm
Sergey Isakov 7c0aa811ec 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 12:58:42 +03:00

848 lines
25 KiB
NASM
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; TITLE CpuInterrupt.nasm:
;------------------------------------------------------------------------------
;*
;* Copyright 2006 - 2010, 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.
;*
;* CpuInterrupt.asm
;*
;* Abstract:
;*
;------------------------------------------------------------------------------
global ASM_PFX(InstallInterruptHandler)
global ASM_PFX(InitDescriptor)
global ASM_PFX(SystemExceptionHandler)
global ASM_PFX(SystemTimerHandler)
;global ASM_PFX(mExceptionCodeSize)
;
; Workaround for NASM bug emitting incorrect
; pc-relative relocations to mach-o i386
; object files.
;
%ifidn __OUTPUT_FORMAT__, macho
%macro MakeCall 2
mov %1, %2
call %1
%endmacro
%elifidn __OUTPUT_FORMAT__, macho32
%macro MakeCall 2
mov %1, %2
call %1
%endmacro
%else
%macro MakeCall 2
call %2
%endmacro
%endif
SECTION .text
EXTERN ASM_PFX(TimerHandler)
EXTERN ASM_PFX(ExceptionHandler)
ASM_PFX(InitDescriptor):
mov eax, GDT_BASE ; EAX=PHYSICAL address of gdt
mov [gdtr + 2], eax ; Put address of gdt into the gdtr
lgdt [gdtr]
mov eax, IDT_BASE ; EAX=PHYSICAL address of idt
mov [idtr + 2], eax ; Put address of idt into the idtr
lidt [idtr]
ret
; VOID
; EFIAPI
; InstallInterruptHandler (
; UINTN Vector, //6(SP)
; void (*Handler)(void) //10(SP)
; )
ASM_PFX(InstallInterruptHandler):
push edi
pushfd ; save eflags
cli ; turn off interrupts
sub esp, 6 ; open some space on the stack
mov edi, esp
sidt [edi] ; get fword address of IDT
mov edi, [edi+2] ; move offset of IDT into EDI
add esp, 6 ; correct stack
mov eax, [esp+12] ; Get vector number
shl eax, 3 ; multiply by 8 to get offset
add edi, eax ; add to IDT base to get entry
mov eax, [esp+16] ; load new address into IDT entry
mov word [edi], ax ; write bits 15..0 of offset
shr eax, 16 ; use ax to copy 31..16 to descriptors
mov word [edi+6], ax ; write bits 31..16 of offset
popfd ; restore flags (possible enabling interrupts)
pop edi
ret
%macro JmpCommonIdtEntry 0
; jmp commonIdtEntry - this must be hand coded to keep the assembler from
; using a 8 bit reletive jump when the entries are
; within 255 bytes of the common entry. This must
; be done to maintain the consistency of the size
; of entry points...
db 0e9h ; jmp 16 bit reletive
dd commonIdtEntry - $ - 4 ; offset to jump to
%endmacro
ALIGN 02h
ASM_PFX(SystemExceptionHandler):
INT0:
push 0h ; push error code place holder on the stack
push 0h
JmpCommonIdtEntry
; db 0e9h ; jmp 16 bit reletive
; dd commonIdtEntry - $ - 4 ; offset to jump to
INT1:
push 0h ; push error code place holder on the stack
push 1h
JmpCommonIdtEntry
INT2:
push 0h ; push error code place holder on the stack
push 2h
JmpCommonIdtEntry
INT3:
push 0h ; push error code place holder on the stack
push 3h
JmpCommonIdtEntry
INT4:
push 0h ; push error code place holder on the stack
push 4h
JmpCommonIdtEntry
INT5:
push 0h ; push error code place holder on the stack
push 5h
JmpCommonIdtEntry
INT6:
push 0h ; push error code place holder on the stack
push 6h
JmpCommonIdtEntry
INT7:
push 0h ; push error code place holder on the stack
push 7h
JmpCommonIdtEntry
INT8:
; Double fault causes an error code to be pushed so no phony push necessary
nop
nop
push 8h
JmpCommonIdtEntry
INT9:
push 0h ; push error code place holder on the stack
push 9h
JmpCommonIdtEntry
INT10:
; Invalid TSS causes an error code to be pushed so no phony push necessary
nop
nop
push 10
JmpCommonIdtEntry
INT11:
; Segment Not Present causes an error code to be pushed so no phony push necessary
nop
nop
push 11
JmpCommonIdtEntry
INT12:
; Stack fault causes an error code to be pushed so no phony push necessary
nop
nop
push 12
JmpCommonIdtEntry
INT13:
; GP fault causes an error code to be pushed so no phony push necessary
nop
nop
push 13
JmpCommonIdtEntry
INT14:
; Page fault causes an error code to be pushed so no phony push necessary
nop
nop
push 14
JmpCommonIdtEntry
INT15:
push 0h ; push error code place holder on the stack
push 15
JmpCommonIdtEntry
INT16:
push 0h ; push error code place holder on the stack
push 16
JmpCommonIdtEntry
INT17:
; Alignment check causes an error code to be pushed so no phony push necessary
nop
nop
push 17
JmpCommonIdtEntry
INT18:
push 0h ; push error code place holder on the stack
push 18
JmpCommonIdtEntry
INT19:
push 0h ; push error code place holder on the stack
push 19
JmpCommonIdtEntry
INTUnknown:
%rep (32 - 20)
push 0h ; push error code place holder on the stack
; push xxh ; push vector number
db 06ah
db ( $ - INTUnknown - 3 ) / 9 + 20 ; vector number
JmpCommonIdtEntry
%endrep
;ENDM
ASM_PFX(SystemTimerHandler):
push 0
push 0 ;mTimerVector ;to be patched in Cpu.c
JmpCommonIdtEntry
commonIdtEntry:
; +---------------------+
; + EFlags +
; +---------------------+
; + CS +
; +---------------------+
; + EIP +
; +---------------------+
; + Error Code +
; +---------------------+
; + Vector Number +
; +---------------------+
; + EBP +
; +---------------------+ <-- EBP
cli
push ebp
mov ebp, esp
;
; Align stack to make sure that EFI_FX_SAVE_STATE_IA32 of EFI_SYSTEM_CONTEXT_IA32
; is 16-byte aligned
;
and esp, 0fffffff0h
sub esp, 12
;; UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;
push eax
push ecx
push edx
push ebx
lea ecx, [ebp + 6 * 4]
push ecx ; ESP
push dword [ebp] ; EBP
push esi
push edi
;; UINT32 Gs, Fs, Es, Ds, Cs, Ss;
mov ax, ss
push eax
movzx eax, word [ebp + 4 * 4]
push eax
mov ax, ds
push eax
mov ax, es
push eax
mov ax, fs
push eax
mov ax, gs
push eax
;; UINT32 Eip;
push dword [ebp + 3 * 4]
;; UINT32 Gdtr[2], Idtr[2];
sub esp, 8
sidt [esp]
sub esp, 8
sgdt [esp]
;; UINT32 Ldtr, Tr;
xor eax, eax
str ax
push eax
sldt eax
push eax
;; UINT32 EFlags;
push dword [ebp + 5 * 4]
;; UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;
mov eax, cr4
or eax, 208h
mov cr4, eax
push eax
mov eax, cr3
push eax
mov eax, cr2
push eax
xor eax, eax
push eax
mov eax, cr0
push eax
;; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
mov eax, dr7
push eax
;; clear Dr7 while executing debugger itself
xor eax, eax
mov dr7, eax
mov eax, dr6
push eax
;; insure all status bits in dr6 are clear...
xor eax, eax
mov dr6, eax
mov eax, dr3
push eax
mov eax, dr2
push eax
mov eax, dr1
push eax
mov eax, dr0
push eax
;; FX_SAVE_STATE_IA32 FxSaveState;
sub esp, 512
mov edi, esp
db 0fh, 0aeh, 00000111y ;fxsave [edi]
;; UINT32 ExceptionData;
push dword [ebp + 2 * 4]
;; Prepare parameter and call
mov edx, esp
push edx
mov eax, dword [ebp + 1 * 4]
push eax
cmp eax, 32
jb CallException
MakeCall eax, ASM_PFX(TimerHandler)
jmp ExceptionDone
CallException:
MakeCall eax, ASM_PFX(ExceptionHandler)
ExceptionDone:
add esp, 8
cli
;; UINT32 ExceptionData;
add esp, 4
;; FX_SAVE_STATE_IA32 FxSaveState;
mov esi, esp
db 0fh, 0aeh, 00001110y ; fxrstor [esi]
add esp, 512
;; UINT32 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
pop eax
mov dr0, eax
pop eax
mov dr1, eax
pop eax
mov dr2, eax
pop eax
mov dr3, eax
;; skip restore of dr6. We cleared dr6 during the context save.
add esp, 4
pop eax
mov dr7, eax
;; UINT32 Cr0, Cr1, Cr2, Cr3, Cr4;
pop eax
mov cr0, eax
add esp, 4 ; not for Cr1
pop eax
mov cr2, eax
pop eax
mov cr3, eax
pop eax
mov cr4, eax
;; UINT32 EFlags;
pop dword [ebp + 5 * 4]
;; UINT32 Ldtr, Tr;
;; UINT32 Gdtr[2], Idtr[2];
;; Best not let anyone mess with these particular registers...
add esp, 24
;; UINT32 Eip;
pop dword [ebp + 3 * 4]
;; UINT32 Gs, Fs, Es, Ds, Cs, Ss;
;; NOTE - modified segment registers could hang the debugger... We
;; could attempt to insulate ourselves against this possibility,
;; but that poses risks as well.
;;
pop gs
pop fs
pop es
pop ds
pop dword [ebp + 4 * 4]
pop ss
;; UINT32 Edi, Esi, Ebp, Esp, Ebx, Edx, Ecx, Eax;
pop edi
pop esi
add esp, 4 ; not for ebp
add esp, 4 ; not for esp
pop ebx
pop edx
pop ecx
pop eax
mov esp, ebp
pop ebp
add esp, 8
iretd
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; data
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
SECTION .data
ALIGN 04h
gdtr dw GDT_END - GDT_BASE - 1 ; GDT limit
dd 0 ;GDT_BASE ; (GDT base gets set above)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; global descriptor table (GDT)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
ALIGN 04h ; make GDT 4-byte align
GDT_BASE:
; null descriptor
NULL_SEL equ $-GDT_BASE ; Selector [0x0]
dw 0 ; limit 15:0
dw 0 ; base 15:0
db 0 ; base 23:16
db 0 ; type
db 0 ; limit 19:16, flags
db 0 ; base 31:24
; linear data segment descriptor
LINEAR_SEL equ $-GDT_BASE ; Selector [0x8]
dw 0FFFFh ; limit 0xFFFFF
dw 0 ; base 0
db 0
db 092h ; present, ring 0, data, expand-up, writable
db 0CFh ; page-granular, 32-bit
db 0
; linear code segment descriptor
LINEAR_CODE_SEL equ $-GDT_BASE ; Selector [0x10]
dw 0FFFFh ; limit 0xFFFFF
dw 0 ; base 0
db 0
db 09Ah ; present, ring 0, code, expand-up, writable
db 0CFh ; page-granular, 32-bit
db 0
; system data segment descriptor
SYS_DATA_SEL equ $-GDT_BASE ; Selector [0x18]
dw 0FFFFh ; limit 0xFFFFF
dw 0 ; base 0
db 0
db 092h ; present, ring 0, data, expand-up, writable
db 0CFh ; page-granular, 32-bit
db 0
; system code segment descriptor
SYS_CODE_SEL equ $-GDT_BASE ; Selector [0x20]
dw 0FFFFh ; limit 0xFFFFF
dw 0 ; base 0
db 0
db 09Ah ; present, ring 0, code, expand-up, writable
db 0CFh ; page-granular, 32-bit
db 0
; spare segment descriptor
SPARE3_SEL equ $-GDT_BASE ; Selector [0x28]
dw 0
dw 0
db 0
db 0
db 0
db 0
; spare segment descriptor
SPARE4_SEL equ $-GDT_BASE ; Selector [0x30]
dw 0
dw 0
db 0
db 0
db 0
db 0
; spare segment descriptor
SPARE5_SEL equ $-GDT_BASE ; Selector [0x38]
dw 0
dw 0
db 0
db 0
db 0
db 0
GDT_END:
ALIGN 04h
idtr dw IDT_END - IDT_BASE - 1 ; IDT limit
dd 0 ;IDT_BASE ; (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.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
ALIGN 04h ; make IDT 4-byte align
;global IDT_BASE
IDT_BASE:
; divide by zero (INT 0)
DIV_ZERO_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
; debug exception (INT 1)
DEBUG_EXCEPT_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
; NMI (INT 2)
NMI_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
; soft breakpoint (INT 3)
BREAKPOINT_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
; overflow (INT 4)
OVERFLOW_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
; bounds check (INT 5)
BOUNDS_CHECK_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
; invalid opcode (INT 6)
INVALID_OPCODE_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
; device not available (INT 7)
DEV_NOT_AVAIL_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
; double fault (INT 8)
DOUBLE_FAULT_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
; Coprocessor segment overrun - reserved (INT 9)
RSVD_INTR_SEL1 equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
; invalid TSS (INT 0ah)
INVALID_TSS_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
; segment not present (INT 0bh)
SEG_NOT_PRESENT_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
; stack fault (INT 0ch)
STACK_FAULT_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
; general protection (INT 0dh)
GP_FAULT_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
; page fault (INT 0eh)
PAGE_FAULT_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
; Intel reserved - do not use (INT 0fh)
RSVD_INTR_SEL2 equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
; floating point error (INT 10h)
FLT_POINT_ERR_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
; alignment check (INT 11h)
ALIGNMENT_CHECK_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
; machine check (INT 12h)
MACHINE_CHECK_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
; SIMD floating-point exception (INT 13h)
SIMD_EXCEPTION_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
%rep (32 - 20)
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
%endrep
; 72 unspecified descriptors
; db (72 * 8) dup(0)
TIMES (72 * 8) db 0
; IRQ 0 (System timer) - (INT 68h)
IRQ0_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
; IRQ 1 (8042 Keyboard controller) - (INT 69h)
IRQ1_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
; Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah)
IRQ2_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
; IRQ 3 (COM 2) - (INT 6bh)
IRQ3_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
; IRQ 4 (COM 1) - (INT 6ch)
IRQ4_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
; IRQ 5 (LPT 2) - (INT 6dh)
IRQ5_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
; IRQ 6 (Floppy controller) - (INT 6eh)
IRQ6_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
; IRQ 7 (LPT 1) - (INT 6fh)
IRQ7_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
; IRQ 8 (RTC Alarm) - (INT 70h)
IRQ8_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
; IRQ 9 - (INT 71h)
IRQ9_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
; IRQ 10 - (INT 72h)
IRQ10_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
; IRQ 11 - (INT 73h)
IRQ11_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
; IRQ 12 (PS/2 mouse) - (INT 74h)
IRQ12_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
; IRQ 13 (Floating point error) - (INT 75h)
IRQ13_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
; IRQ 14 (Secondary IDE) - (INT 76h)
IRQ14_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
; IRQ 15 (Primary IDE) - (INT 77h)
IRQ15_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 8eh ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
; db (1 * 8) dup(0)
TIMES (1 * 8) db 0
IDT_END:
;END
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