os_kernel/kernel/global.h

#ifndef __KERNEL_GLOBAL_H
#define __KERNEL_GLOBAL_H
#include "stdint.h"

#define RPL0 0
#define RPL1 1
#define RPL2 2
#define RPL3 3

#define TI_GDT 0x00
#define TI_LDT 0x01

#define PG_P 1

#define SELECTOR_K_CODE ((1 << 3) + (TI_GDT << 2) + RPL0)
#define SELECTOR_K_DATA ((2 << 3) + (TI_GDT << 2) + RPL0)
#define SELECTOR_K_STACK SELECTOR_K_DATA
#define SELECTOR_K_GS ((3 << 3) + (TI_GDT << 2) + RPL0)

/*---------------------- IDT 描述符属性 -----------------------------------------*/
#define IDT_DESC_P 1
#define IDT_DESC_DPL0 0
#define IDT_DESC_DPL3 3
#define IDT_DESC_32_TYPE 0xE // 32 位的门
#define IDT_DESC_16_TYPE 0x6 // 16 位的门，不用，定义它只为和 32 位门区分

#define IDT_DESC_ATTR_DPL0 ((IDT_DESC_P << 7) + (IDT_DESC_DPL0 << 5) + IDT_DESC_32_TYPE)
#define IDT_DESC_ATTR_DPL3 ((IDT_DESC_P << 7) + (IDT_DESC_DPL3 << 5) + IDT_DESC_32_TYPE)

#define NULL ((void *)0)

#endif // __KERNEL_GLOBAL_H