k-chow/k/events/idt.h

#ifndef IDT_H
#define IDT_H

#include <stdint.h>
#include "gdt.h"
#include "isr.h"

#define IDT_RESERVED_ENTRIES 32
#define IDT_NB_ENTRIES 34
#define IDT_SIZE (IDT_NB_ENTRIES * sizeof(struct idt_entry))

#define INTERRUPT_TYPE 0x6
#define TRAP_TYPE      0x7

#define KEYBOARD_INT_VECTOR 33

struct idt_entry
{
    uint16_t offset_1   : 16;
    struct segment_selector selector;

    uint8_t zero_1      : 8;    // unused, set to 0
    uint8_t type        : 3;    // gate type
    uint8_t size        : 1;
    uint8_t zero_2      : 1;    // set to 0 for interrupt and trap gates
    uint8_t desc_priv   : 2;    // Descriptor privilege
    uint8_t present     : 1;

    uint16_t offset_2   : 16;
} __attribute__ ((packed));

struct idt
{
    struct idt_entry entries[IDT_NB_ENTRIES];
};

struct idt_r
{
    uint16_t limit;
    uint32_t addr;
} __attribute__ ((packed));

struct idt_entry_descriptor
{
    uint32_t offset;
    struct segment_selector selector;
    char type;
};

void init_idt(void);

void interrupt_handler(struct isr_param *isr_param);

#endif  /* !IDT_H */