57 lines
891 B
ArmAsm
57 lines
891 B
ArmAsm
;; File: idt.s
|
|
;;
|
|
[BITS 32]
|
|
|
|
%include "sys/i386/cpu.inc"
|
|
|
|
section .text
|
|
|
|
idt_set_table:
|
|
push ebp
|
|
mov ebp, esp
|
|
|
|
mov ecx, [ebp + 8]
|
|
|
|
extern isr_list
|
|
mov eax, [isr_list + (ecx * 4)]
|
|
|
|
; offset (low)
|
|
mov word [idt_entries + (ecx * 8)], ax
|
|
; segment selector (kernel code)
|
|
mov word [idt_entries + (ecx * 8) + idt_gate.selector], 0x08
|
|
; zero (skip)
|
|
; attr: 1 (Present) 00 (DPL) 0 1 (D: 32bits) 110
|
|
mov byte [idt_entries + (ecx * 8) + idt_gate.attributes], 0x8E
|
|
|
|
; offset (high)
|
|
shr eax, 16
|
|
mov word [idt_entries + (ecx * 8) + idt_gate.offset_high], ax
|
|
|
|
leave
|
|
ret
|
|
|
|
global idt_setup
|
|
idt_setup:
|
|
%assign i 0
|
|
%rep 32
|
|
push dword i
|
|
call idt_set_table
|
|
add esp, 4
|
|
%assign i i+1
|
|
%endrep
|
|
|
|
lidt [idt_ptr]
|
|
sti
|
|
ret
|
|
|
|
section .data
|
|
align 8
|
|
idt_ptr:
|
|
dw idt_entries.end-idt_entries-1
|
|
dd idt_entries
|
|
|
|
; variable: idt_entries
|
|
align 8
|
|
idt_entries:
|
|
times 256 dd 0x00000000, 0x00000000
|
|
.end:
|