idt.h

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#pragma once
 
#include "stdint.h"
 
#define IDT_SIZE 256
#define TASK_GATE 0x5
#define INT16_GATE 0x6
#define TRAP16_GATE 0x7
#define INT32_GATE 0xE
#define TRAP32_GATE 0xF
 
/*
 * Trap and Interrupt gates are similar, and their descriptors are
 * structurally the same, they differ only in the "type" field. The
 * difference is that for interrupt gates, interrupts are automatically
 * disabled upon entry and reenabled upon IRET which restores the saved EFLAGS.
 */
 
typedef struct idt_descriptor_t {
    uint16_t offset_low;
    uint16_t seg_selector;
    uint8_t reserved;
    uint8_t options;
    uint16_t offset_high;
} __attribute__((packed)) idt_descriptor_t;
 
typedef struct idt_pointer_t {
    uint16_t limit;
    uint32_t base;
} __attribute__((packed)) idt_pointer_t;
 
void init_idt(void);