.code64
.global gdt64_tss

gdt64:
    gdt64_null:
    .word 0xFFF
    .word 0x0
    .byte 0
    .byte 0
    .byte 1
    .byte 0
    gdt64_cs:
    .long 0
    .byte 0
    .byte 0b10011010   # Present and non-conforming Readable
    .byte 0b00100000   # Long mode
    .byte 0
    gdt64_ds:
    .long 0
    .byte 0
    .byte 0b10010010  # Present, writable
    .word 0
    gdt64_cs_user:
    .long 0
    .byte 0
    .byte 0b11111010  # Present, Privilege 3 and non-conforming Readable
    .byte 0b00100000  # Long mode
    .byte 0
    gdt64_ds_user:
    .long 0
    .byte 0
    .byte 0b11110010 # Present, Privilege 3 and writable
    .word 0
    gdt64_tss:  # Will be setup in the boucane() function
    .long 0
    .long 0
    .long 0
    .long 0
gdtr:
    .word . - gdt64 - 1
    .quad gdt64

.global load_gdt
load_gdt:
    lgdt (gdtr)
    ret