#GDT

gdt_start:
INITSEG = 0x0050
INITOFF = 0x0000

.section .rodata

gdt:
   # Null Descriptor
   .word 0x0000, 0x0000
   .byte 0x00, 0b00000000, 0b00000000, 0x00
   # Code Descriptor
   .word 0xffff, (INITSEG * 0x10 + INITOFF)
   .byte 0x00, 0b10011010, 0b11001111, 0x00
   # Data Descriptor
   .word 0xffff, (INITSEG * 0x10 + INITOFF)
   .byte 0x00, 0b10010010, 0b11001111, 0x00
gdt_end:

gdt32ptr:
   .word (gdt_end - gdt - 1)
   .long (gdt + INITSEG * 0x10 + INITOFF)

gdt64ptr:
   .word (gdt_end - gdt - 1)
   .quad (gdt + INITSEG * 0x10 + INITOFF)