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#ifndef _AMD64_GDT_H_
#define _AMD64_GDT_H_
#include <sys/types.h>
#include <sys/cdefs.h>
#define KERNEL_CS 0x08
#define KERNEL_DS 0x10
#define USER_CS 0x18
#define USER_DS 0x20
#define GDT_TSS 5
struct __packed gdt_entry {
uint16_t limit;
uint16_t base_low;
uint8_t base_mid;
uint8_t access;
uint8_t granularity;
uint8_t base_hi;
};
struct __packed gdtr {
uint16_t limit;
uintptr_t offset;
};
__always_inline static inline void
gdt_load(struct gdtr *gdtr)
{
__ASMV("lgdt %0\n"
"push $8\n" /* Push CS */
"lea 1f(%%rip), %%rax\n" /* Load 1 label address into RAX */
"push %%rax\n" /* Push the return address (label 1) */
"lretq\n" /* Far return to update CS */
"1:\n"
" mov $0x10, %%eax\n"
" mov %%eax, %%ds\n"
" mov %%eax, %%es\n"
" mov %%eax, %%fs\n"
" mov %%eax, %%gs\n"
" mov %%eax, %%ss\n"
:
: "m" (*gdtr)
: "rax", "memory"
);
}
extern struct gdt_entry g_gdt_data[256];
#endif /* !AMD64_GDT_H_ */
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