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#include <kernel/arch/amd64/32/gdt.h>
#include <kernel/arch/amd64/interrupts/idt.h>
#include <kernel/arch/amd64/interrupts/isr.h>
#include <kernel/panic.h>
#include <stdbool.h>
#include <stdint.h>
struct idt_entry {
uint16_t offset_low;
uint16_t seg;
uint8_t ist;
uint8_t type : 4; // 0xE - interrupt, 0xF - trap
uint8_t zero1 : 1;
uint8_t ring : 2;
uint8_t present : 1;
uint16_t offset_mid;
uint32_t offset_high;
uint32_t zero2;
} __attribute__((packed));
// is exactly the same as lgdt_arg, i should combine them into a single struct
// later
struct lidt_arg {
uint16_t limit;
uintptr_t base;
} __attribute__((packed));
__attribute__((section(".shared")))
static struct idt_entry IDT[256];
static struct lidt_arg lidt_arg;
static void idt_prepare(void);
static void idt_load(void);
static void idt_test(void);
static void idt_prepare(void) {
for (int i = 0; i < 256; i++) {
uintptr_t offset = (uintptr_t) &_isr_stubs + i * 8;
IDT[i] = (struct idt_entry) {
.offset_low = offset,
.offset_mid = offset >> 16,
.offset_high = offset >> 32,
.seg = SEG_r0code << 3,
.present = 1,
.type = 0xE,
.ist = 1,
};
}
}
static void idt_load(void) {
lidt_arg.limit = sizeof(IDT) - 1;
lidt_arg.base = (uintptr_t) &IDT;
asm("lidt (%0)" : : "r" (&lidt_arg) : "memory");
}
static void idt_test(void) {
kprintf("idt test?\n");
asm("xchgw %%bx, %%bx" ::: "memory");
asm("int $0x34" : : : "memory");
assert(isr_test_interrupt_called);
kprintf("done.\n");
}
void idt_init(void) {
idt_prepare();
idt_load();
idt_test();
}
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