arch/x86_64/idt.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46

#include "arch/x86_64/tables.h"
#include "arch/x86_64/idt.h"

__attribute__((aligned(4096)))
interrupt_gate_t s_idtd[256];

int64_t __isr_err;
int64_t __isr_num;

void
isr_handle(ivt_state_t* state)
{
    kpanic_state(state, "Unhandled interrupt %i", __isr_num);
}

void
ivt_setup(void)
{
    extern uintptr_t __ivt[256];
    for(int i = 0; i < 256; i++) {
        uintptr_t base = __ivt[i];
        s_idtd[i] = (interrupt_gate_t) {
            .base_0_15 = (base & 0xFFFF),
            .segment_selector = 0x8,
            .ist = 0,
            .zero_0 = 0,
            .type = 0xE,
            .zero_1 = 0,
            .dpl = 0,
            .p = 1,
            .base_16_31 = (base >> 16) & 0xFFFF,
            .base_32_63 = (base >> 32) & 0xFFFFFFFF,
            .resv = 0
        };
    }
}

void
idt_setup(processor_t *processor)
{
    processor->idtr.base = (uintptr_t)&s_idtd;
    processor->idtr.length = sizeof(s_idtd) - 1;
    
    extern void idt_load(void* idtr);
    idt_load(&processor->idtr);
}