forked from PoliEcho-holding-org/kern
38 lines
811 B
C
38 lines
811 B
C
#ifndef _IDT_H
|
|
#define _IDT_H
|
|
|
|
#include <kernel.h>
|
|
|
|
#define IDT_ENTRIES 256
|
|
#define IDT_FLAG_TRAP 0x8F // P = 1, Priv = 00, S = 0, Type = 1111 (32-bit trap)
|
|
#define IDT_FLAG_INT 0x8E // P = 1, Priv = 00, S = 0, Type = 1110 (32-bit int)
|
|
#define IDT_FLAG_USER 0xEE // P = 1, Priv = 11, S = 0, Type = 1110 (32-bit int)
|
|
|
|
/*
|
|
* Attribute field explanation
|
|
* 0..3 Gate type
|
|
* 4 Zero (unused)
|
|
* 5..6 DPL (privilege)
|
|
* 7 Present
|
|
*/
|
|
|
|
struct idt_entry {
|
|
uint16_t offset_low;
|
|
uint16_t selector;
|
|
uint8_t ist; // Only 3 low bits, rest is reserved
|
|
uint8_t attrib;
|
|
uint16_t offset_mid;
|
|
uint32_t offset_high;
|
|
uint32_t __reserved;
|
|
} __packed;
|
|
|
|
struct idt_pointer {
|
|
uint16_t size;
|
|
uint64_t offset;
|
|
} __packed;
|
|
|
|
int idt_init(void);
|
|
void idt_set_gate(uint8_t i, void* handler, uint8_t flags, uint8_t ist);
|
|
|
|
#endif
|