72 lines
1.4 KiB
C
72 lines
1.4 KiB
C
#include <stdint.h>
|
|
#include <sys/gdt.h>
|
|
|
|
static struct gdt_desc gdt_descs[] = {
|
|
{0},
|
|
|
|
{
|
|
.limit = 0xffff,
|
|
.base_low = 0x0000,
|
|
.base_mid = 0x00,
|
|
.access = 0b10011010,
|
|
.granularity = 0b00000000,
|
|
.base_hi = 0x00
|
|
},
|
|
|
|
{
|
|
.limit = 0xffff,
|
|
.base_low = 0x0000,
|
|
.base_mid = 0x00,
|
|
.access = 0b10010010,
|
|
.granularity = 0b00000000,
|
|
.base_hi = 0x00
|
|
},
|
|
|
|
{
|
|
.limit = 0xffff,
|
|
.base_low = 0x0000,
|
|
.base_mid = 0x00,
|
|
.access = 0b10011010,
|
|
.granularity = 0b11001111,
|
|
.base_hi = 0x00
|
|
},
|
|
|
|
{
|
|
.limit = 0xffff,
|
|
.base_low = 0x0000,
|
|
.base_mid = 0x00,
|
|
.access = 0b10010010,
|
|
.granularity = 0b11001111,
|
|
.base_hi = 0x00
|
|
},
|
|
|
|
{
|
|
.limit = 0x0000,
|
|
.base_low = 0x0000,
|
|
.base_mid = 0x00,
|
|
.access = 0b10011010,
|
|
.granularity = 0b00100000,
|
|
.base_hi = 0x00
|
|
},
|
|
|
|
{
|
|
.limit = 0x0000,
|
|
.base_low = 0x0000,
|
|
.base_mid = 0x00,
|
|
.access = 0b10010010,
|
|
.granularity = 0b00000000,
|
|
.base_hi = 0x00
|
|
}
|
|
};
|
|
|
|
#if defined (bios)
|
|
__attribute__((section(".realmode")))
|
|
#endif
|
|
struct gdtr gdt = {
|
|
sizeof(gdt_descs) - 1,
|
|
(uintptr_t)gdt_descs,
|
|
#if defined (bios)
|
|
0
|
|
#endif
|
|
};
|