matos/core/idt.h
2018-07-20 15:42:51 +02:00

46 lines
998 B
C

#pragma once
#include "types.h"
#define IDT_NUM 256
#define RING_0 0
#define RING_1 1
#define RING_2 2
#define RING_3 3
#define SEGMENT_IDX_NULL 0
#define SEGMENT_IDX_CODE 1
#define SEGMENT_IDX_DATA 2
struct idtEntry {
uint16_t offset_low;
uint16_t seg_sel;
uint8_t reserved : 5;
uint8_t flags : 3;
uint8_t type : 3;
uint8_t op_size : 1;
uint8_t zero : 1;
uint8_t dpl : 2;
uint8_t present : 1;
uint16_t offset_high;
} __attribute__((packed));
/**
* The IDT register, which stores the address and size of the
* IDT.
*
* @see Intel x86 doc vol 3, section 2.4, figure 2-4
*/
struct idtRegister {
uint16_t limit;
uint32_t base_addr;
} __attribute__((packed, aligned(8)));
/* Build segment http://wiki.osdev.org/Selector*/
#define BUILD_SEGMENT_SELECTOR(desc_privilege, in_ldt, index) \
((((desc_privilege)&0x3) << 0) | (((in_ldt) ? 1 : 0) << 2) | \
((index) << 3))
int idtSetup();
int idt_set_handler(int index, unsigned int addr, int priviledge);