.code64

gdt64:
    gdt64_null:
    .long 0
    .long 0
    gdt64_cs:
    .long 0
    .byte 0
    .byte 0b10011100
    .byte 0b00100000
    .byte 0
    gdt64_ds:
    .long 0
    .byte 0
    .byte 0b10010010
    .word 0
gdtr:
    .word . - gdt64 - 1
    .quad gdt64

.global load_gdt
load_gdt:
    lgdt (gdtr)
    ret