.code32
.extern gdt_ptr

.global _gdt_switch
_gdt_switch:
    lgdt gdt_ptr
    movw $0x10,%ax
    movw %ax,%ds
    movw %ax,%es
    movw %ax,%fs
    movw %ax,%gs
    ljmp $0x8, $_gdt_switch_continue
_gdt_switch_continue:
    movw $0x2a, %ax // 0x28 + 0x03 = 0x2a
    ltr %ax
    ret