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idt.s
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/* GPLv2 (c) Airbus */
.text
.globl resume_from_intr
.type resume_from_intr,"function"
.globl idt_trampoline
.type idt_trampoline,"function"
/*
** send end-of-interrupt to PIC
*/
ack_pic2:
push %eax
movb $0x20, %al
outb %al, $0xa0
jmp eoi_pic1
ack_pic1:
push %eax
movb $0x20, %al
eoi_pic1:
outb %al, $0x20
pop %eax
/*
** ring0 int stack layout
**
** SS | if pvl level change
** ESP | if pvl level change
** EFLAGS
** CS
** EIP
** ERR CODE
** INT NUMBER
** EAX
** ...
** EDI
*/
idt_common:
pusha
mov %esp, %eax
call intr_hdlr
resume_from_intr:
popa
add $8, %esp
iret
/*
** IDT handlers
*/
.section .idt_jmp, "ax", @progbits
idt_trampoline:
/* divide error (no) */
.align 16
pushl $-1
pushl $0
jmp idt_common
/* debug (no) */
.align 16
pushl $-1
pushl $1
jmp idt_common
/* nmi (no ) */
.align 16
pushl $-1
pushl $2
jmp idt_common
/* breakpoint (no) */
.align 16
pushl $-1
pushl $3
jmp idt_common
/* overflow (no) */
.align 16
pushl $-1
pushl $4
jmp idt_common
/* bound (no) */
.align 16
pushl $-1
pushl $5
jmp idt_common
/* invalid opcode (no) */
.align 16
pushl $-1
pushl $6
jmp idt_common
/* device not available (no) */
.align 16
pushl $-1
pushl $7
jmp idt_common
/* double fault (yes) */
.align 16
pushl $8
jmp idt_common
/* copro segment (no) */
.align 16
pushl $-1
pushl $9
jmp idt_common
/* TSS invalid (yes) */
.align 16
pushl $10
jmp idt_common
/* Segment not present (yes) */
.align 16
pushl $11
jmp idt_common
/* stack segment fault (yes) */
.align 16
pushl $12
jmp idt_common
/* general protection (yes) */
.align 16
pushl $13
jmp idt_common
/* page fault (yes) */
.align 16
pushl $14
jmp idt_common
/* intel reserved */
.align 16
pushl $-1
pushl $15
jmp idt_common
/* fpu (no ) */
.align 16
pushl $-1
pushl $16
jmp idt_common
/* alignment (yes) */
.align 16
pushl $17
jmp idt_common
/* machine check (no) */
.align 16
pushl $-1
pushl $18
jmp idt_common
/* simd (no) */
.align 16
pushl $-1
pushl $19
jmp idt_common
/* intel reserved 20-31 */
.rep 12
.align 16
iret
.endr
/* pic 1 irq 32-39 */
.irp nr,32,33,34,35,36,37,38,39
.align 16
pushl $-1
push $\nr
jmp ack_pic1
.endr
/* pic 2 irq 40-47 */
.irp nr,40,41,42,43,44,45,46,47
.align 16
pushl $-1
push $\nr
jmp ack_pic2
.endr
/* available 48-255 */
.irp nr, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255
.align 16
pushl $-1
pushl $\nr
jmp idt_common
.endr