hippOS/cpu/idt.c

#include <stdbool.h>
#include <stddef.h>
#include "cpu/idt.h"


struct interrupt_descriptor_32 idt[256];
static size_t idt_ptr[2];

void idt_init(void) {
    size_t idt_address = (size_t)idt;
    idt_ptr[0] = (sizeof (struct interrupt_descriptor_32) * 256) + ((idt_address & 0xffff) << 16);
    idt_ptr[1] = idt_address >> 16;

    __asm__ __volatile__(
        "lidt %0\n\t"
        "sti\n\t" : : "m"(idt_ptr)
    );
}

void idt_register_handler(uint8_t interrupt, size_t address) {
    idt[interrupt].offset_1 = address & 0xffff;
    idt[interrupt].selector = KERNEL_CODE_SEGMENT_OFFSET;
    idt[interrupt].zero = 0;
    idt[interrupt].type_attributes = INTERRUPT_GATE;
    idt[interrupt].offset_2 = (address & 0xffff0000) >> 16;
}