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|
TITLE CpuInterrupt.asm:
;------------------------------------------------------------------------------
;*
;* Copyright 2006, 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:
;*
;------------------------------------------------------------------------------
EXTERNDEF mExceptionCodeSize:DWORD
.code
EXTERN TimerHandler: FAR
EXTERN ExceptionHandler: NEAR
EXTERN mTimerVector: QWORD
mExceptionCodeSize DD 9
InitDescriptor PROC
lea rax, [GDT_BASE] ; RAX=PHYSICAL address of gdt
mov qword ptr [gdtr + 2], rax ; Put address of gdt into the gdtr
lgdt fword ptr [gdtr]
mov rax, 18h
mov gs, rax
mov fs, rax
lea rax, [IDT_BASE] ; RAX=PHYSICAL address of idt
mov qword ptr [idtr + 2], rax ; Put address of idt into the idtr
lidt fword ptr [idtr]
ret
InitDescriptor ENDP
; VOID
; InstallInterruptHandler (
; UINTN Vector, // rcx
; void (*Handler)(void) // rdx
; )
InstallInterruptHandler PROC
push rbx
pushfq ; save eflags
cli ; turn off interrupts
sub rsp, 10h ; open some space on the stack
mov rbx, rsp
sidt [rbx] ; get fword address of IDT
mov rbx, [rbx+2] ; move offset of IDT into RBX
add rsp, 10h ; correct stack
mov rax, rcx ; Get vector number
shl rax, 4 ; multiply by 16 to get offset
add rbx, rax ; add to IDT base to get entry
mov rax, rdx ; load new address into IDT entry
mov word ptr [rbx], ax ; write bits 15..0 of offset
shr rax, 16 ; use ax to copy 31..16 to descriptors
mov word ptr [rbx+6], ax ; write bits 31..16 of offset
shr rax, 16 ; use eax to copy 63..32 to descriptors
mov dword ptr [rbx+8], eax ; write bits 63..32 of offset
popfq ; restore flags (possible enabling interrupts)
pop rbx
ret
InstallInterruptHandler ENDP
JmpCommonIdtEntry macro
; 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
endm
align 02h
SystemExceptionHandler PROC
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:
REPEAT (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
ENDM
SystemExceptionHandler ENDP
SystemTimerHandler PROC
push 0
push mTimerVector
JmpCommonIdtEntry
SystemTimerHandler ENDP
commonIdtEntry:
; +---------------------+ <-- 16-byte aligned ensured by processor
; + Old SS +
; +---------------------+
; + Old RSP +
; +---------------------+
; + RFlags +
; +---------------------+
; + CS +
; +---------------------+
; + RIP +
; +---------------------+
; + Error Code +
; +---------------------+
; + Vector Number +
; +---------------------+
; + RBP +
; +---------------------+ <-- RBP, 16-byte aligned
cli
push rbp
mov rbp, rsp
;
; Since here the stack pointer is 16-byte aligned, so
; EFI_FX_SAVE_STATE_X64 of EFI_SYSTEM_CONTEXT_x64
; is 16-byte aligned
;
;; UINT64 Rdi, Rsi, Rbp, Rsp, Rbx, Rdx, Rcx, Rax;
;; UINT64 R8, R9, R10, R11, R12, R13, R14, R15;
push r15
push r14
push r13
push r12
push r11
push r10
push r9
push r8
push rax
push rcx
push rdx
push rbx
push qword ptr [rbp + 6 * 8] ; RSP
push qword ptr [rbp] ; RBP
push rsi
push rdi
;; UINT64 Gs, Fs, Es, Ds, Cs, Ss; insure high 16 bits of each is zero
movzx rax, word ptr [rbp + 7 * 8]
push rax ; for ss
movzx rax, word ptr [rbp + 4 * 8]
push rax ; for cs
mov rax, ds
push rax
mov rax, es
push rax
mov rax, fs
push rax
mov rax, gs
push rax
;; UINT64 Rip;
push qword ptr [rbp + 3 * 8]
;; UINT64 Gdtr[2], Idtr[2];
sub rsp, 16
sidt fword ptr [rsp]
sub rsp, 16
sgdt fword ptr [rsp]
;; UINT64 Ldtr, Tr;
xor rax, rax
str ax
push rax
sldt ax
push rax
;; UINT64 RFlags;
push qword ptr [rbp + 5 * 8]
;; UINT64 Cr0, Cr1, Cr2, Cr3, Cr4, Cr8;
mov rax, cr8
push rax
mov rax, cr4
or rax, 208h
mov cr4, rax
push rax
mov rax, cr3
push rax
mov rax, cr2
push rax
xor rax, rax
push rax
mov rax, cr0
push rax
;; UINT64 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
mov rax, dr7
push rax
;; clear Dr7 while executing debugger itself
xor rax, rax
mov dr7, rax
mov rax, dr6
push rax
;; insure all status bits in dr6 are clear...
xor rax, rax
mov dr6, rax
mov rax, dr3
push rax
mov rax, dr2
push rax
mov rax, dr1
push rax
mov rax, dr0
push rax
;; FX_SAVE_STATE_X64 FxSaveState;
sub rsp, 512
mov rdi, rsp
db 0fh, 0aeh, 00000111y ;fxsave [rdi]
;; UINT32 ExceptionData;
push qword ptr [rbp + 2 * 8]
;; call into exception handler
;; Prepare parameter and call
mov rcx, qword ptr [rbp + 1 * 8]
mov rdx, rsp
;
; Per X64 calling convention, allocate maximum parameter stack space
; and make sure RSP is 16-byte aligned
;
sub rsp, 4 * 8 + 8
cmp rcx, 32
jb CallException
call TimerHandler
jmp ExceptionDone
CallException:
call ExceptionHandler
ExceptionDone:
add rsp, 4 * 8 + 8
cli
;; UINT64 ExceptionData;
add rsp, 8
;; FX_SAVE_STATE_X64 FxSaveState;
mov rsi, rsp
db 0fh, 0aeh, 00001110y ; fxrstor [rsi]
add rsp, 512
;; UINT64 Dr0, Dr1, Dr2, Dr3, Dr6, Dr7;
pop rax
mov dr0, rax
pop rax
mov dr1, rax
pop rax
mov dr2, rax
pop rax
mov dr3, rax
;; skip restore of dr6. We cleared dr6 during the context save.
add rsp, 8
pop rax
mov dr7, rax
;; UINT64 Cr0, Cr1, Cr2, Cr3, Cr4, Cr8;
pop rax
mov cr0, rax
add rsp, 8 ; not for Cr1
pop rax
mov cr2, rax
pop rax
mov cr3, rax
pop rax
mov cr4, rax
pop rax
mov cr8, rax
;; UINT64 RFlags;
pop qword ptr [rbp + 5 * 8]
;; UINT64 Ldtr, Tr;
;; UINT64 Gdtr[2], Idtr[2];
;; Best not let anyone mess with these particular registers...
add rsp, 48
;; UINT64 Rip;
pop qword ptr [rbp + 3 * 8]
;; UINT64 Gs, Fs, Es, Ds, Cs, Ss;
pop rax
; mov gs, rax ; not for gs
pop rax
; mov fs, rax ; not for fs
; (X64 will not use fs and gs, so we do not restore it)
pop rax
mov es, rax
pop rax
mov ds, rax
pop qword ptr [rbp + 4 * 8] ; for cs
pop qword ptr [rbp + 7 * 8] ; for ss
;; UINT64 Rdi, Rsi, Rbp, Rsp, Rbx, Rdx, Rcx, Rax;
;; UINT64 R8, R9, R10, R11, R12, R13, R14, R15;
pop rdi
pop rsi
add rsp, 8 ; not for rbp
pop qword ptr [rbp + 6 * 8] ; for rsp
pop rbx
pop rdx
pop rcx
pop rax
pop r8
pop r9
pop r10
pop r11
pop r12
pop r13
pop r14
pop r15
mov rsp, rbp
pop rbp
add rsp, 16
iretq
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; data
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
align 010h
gdtr dw GDT_END - GDT_BASE - 1 ; GDT limit
dq 0 ; (GDT base gets set above)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; global descriptor table (GDT)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
align 010h
public GDT_BASE
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, data, 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, data, expand-up, writable
db 0CFh ; page-granular, 32-bit
db 0
; spare segment descriptor
SPARE3_SEL equ $-GDT_BASE ; Selector [0x28]
dw 0 ; limit 0xFFFFF
dw 0 ; base 0
db 0
db 0 ; present, ring 0, data, expand-up, writable
db 0 ; page-granular, 32-bit
db 0
;
; system data segment descriptor
;
SYS_DATA64_SEL equ $-GDT_BASE ; Selector [0x30]
dw 0FFFFh ; limit 0xFFFFF
dw 0 ; base 0
db 0
db 092h ; P | DPL [1..2] | 1 | 1 | C | R | A
db 0CFh ; G | D | L | AVL | Segment [19..16]
db 0
;
; system code segment descriptor
;
SYS_CODE64_SEL equ $-GDT_BASE ; Selector [0x38]
dw 0FFFFh ; limit 0xFFFFF
dw 0 ; base 0
db 0
db 09Ah ; P | DPL [1..2] | 1 | 1 | C | R | A
db 0AFh ; G | D | L | AVL | Segment [19..16]
db 0
; spare segment descriptor
SPARE4_SEL equ $-GDT_BASE ; Selector [0x40]
dw 0 ; limit 0xFFFFF
dw 0 ; base 0
db 0
db 0 ; present, ring 0, data, expand-up, writable
db 0 ; page-granular, 32-bit
db 0
GDT_END:
align 02h
idtr dw IDT_END - IDT_BASE - 1 ; IDT limit
dq 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 02h
public IDT_BASE
IDT_BASE:
; divide by zero (INT 0)
DIV_ZERO_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; debug exception (INT 1)
DEBUG_EXCEPT_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; NMI (INT 2)
NMI_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; soft breakpoint (INT 3)
BREAKPOINT_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; overflow (INT 4)
OVERFLOW_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; bounds check (INT 5)
BOUNDS_CHECK_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; invalid opcode (INT 6)
INVALID_OPCODE_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; device not available (INT 7)
DEV_NOT_AVAIL_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; double fault (INT 8)
DOUBLE_FAULT_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; Coprocessor segment overrun - reserved (INT 9)
RSVD_INTR_SEL1 equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; invalid TSS (INT 0ah)
INVALID_TSS_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; segment not present (INT 0bh)
SEG_NOT_PRESENT_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; stack fault (INT 0ch)
STACK_FAULT_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; general protection (INT 0dh)
GP_FAULT_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; page fault (INT 0eh)
PAGE_FAULT_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; Intel reserved - do not use (INT 0fh)
RSVD_INTR_SEL2 equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; floating point error (INT 10h)
FLT_POINT_ERR_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; alignment check (INT 11h)
ALIGNMENT_CHECK_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; machine check (INT 12h)
MACHINE_CHECK_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; SIMD floating-point exception (INT 13h)
SIMD_EXCEPTION_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
REPEAT (32 - 20)
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
ENDM
; 72 unspecified descriptors
db (72 * 16) dup(0)
; IRQ 0 (System timer) - (INT 68h)
IRQ0_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; IRQ 1 (8042 Keyboard controller) - (INT 69h)
IRQ1_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; Reserved - IRQ 2 redirect (IRQ 2) - DO NOT USE!!! - (INT 6ah)
IRQ2_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; IRQ 3 (COM 2) - (INT 6bh)
IRQ3_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; IRQ 4 (COM 1) - (INT 6ch)
IRQ4_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; IRQ 5 (LPT 2) - (INT 6dh)
IRQ5_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; IRQ 6 (Floppy controller) - (INT 6eh)
IRQ6_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; IRQ 7 (LPT 1) - (INT 6fh)
IRQ7_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; IRQ 8 (RTC Alarm) - (INT 70h)
IRQ8_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; IRQ 9 - (INT 71h)
IRQ9_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; IRQ 10 - (INT 72h)
IRQ10_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; IRQ 11 - (INT 73h)
IRQ11_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; IRQ 12 (PS/2 mouse) - (INT 74h)
IRQ12_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; IRQ 13 (Floating point error) - (INT 75h)
IRQ13_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; IRQ 14 (Secondary IDE) - (INT 76h)
IRQ14_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
; IRQ 15 (Primary IDE) - (INT 77h)
IRQ15_SEL equ $-IDT_BASE
dw 0 ; offset 15:0
dw SYS_CODE64_SEL ; selector 15:0
db 0 ; 0 for interrupt gate
db 0eh OR 80h ; (10001110)type = 386 interrupt gate, present
dw 0 ; offset 31:16
dd 0 ; offset 63:32
dd 0 ; 0 for reserved
db (1 * 16) dup(0)
IDT_END:
align 02h
END
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