#ifndef SOCKS_X86_64__GDT_H_
#define SOCKS_X86_64__GDT_H_

#include <socks/compiler.h>
#include <stdint.h>

#define NR_GDT_ENTRIES 5

#define GDT_A_PRESENT		(1 << 7)
#define GDT_A_USER		(3 << 5)
#define GDT_A_CODE		(3 << 3)
#define GDT_A_DATA		(8 << 1)
#define GDT_A_RPLK		(1 << 5)
#define GDT_A_CODEREAD		(1 << 1)
#define GDT_A_DATAWRITE		(1 << 1)
#define GDT_A_GROWUP		(1 << 5)
#define GDT_F_64BIT		(0x2F)
#define GDT_F_32BIT		(0x4F)
#define GDT_F_16BIT		(0xF)

struct gdt_entry {
	uint16_t ge_limit_low;
	uint16_t ge_base_low;
	uint8_t ge_base_mid;
	uint8_t ge_access;
	uint8_t ge_gran;
	uint8_t ge_base_hi;
} __packed;

struct gdt {
	struct gdt_entry g_entries[NR_GDT_ENTRIES];
} __packed;

struct gdt_ptr {
	uint16_t g_limit;
	uint64_t g_ptr;
} __packed;

extern int gdt_init(struct gdt *gdt, struct gdt_ptr *gdtp);
extern int gdt_load(struct gdt_ptr *gdtp);

#endif