os-k/kaleid/kernel/mm/paging.asm

global MmEnableWriteProtect
global MmDisableWriteProtect
global MmLoadPML4

MmEnableWriteProtect:
    push rax
    mov rax, cr0
    or rax, 1<<16
    mov cr0, rax
    pop rax
    ret

MmDisableWriteProtect:
    push rax
    mov rax, cr0
    and rax, ~(1<<16)
    mov cr0, rax
    pop rax
    ret

MmLoadPML4:
    push rax
    mov rax, rdi
    mov cr3, rax
    pop rax
    ret