pageing.asm

[bits 32]
page_table_entry equ 0x1000

setup_identity_paging:
    mov edi, page_table_entry
    mov cr3, edi
    mov dword, [edi], 0x2003 ; first table
    add edi, 0x1000
    mov dword, [edi], 0x3003 ; second table
    add edi, 0x1000
    mov dword, [edi], 0x4003 ; third table
    add edi, 0x1000

    mov ebx, 0x00000003
    mov ecx, 512

    .set_entry:
        mov dword [edi], ebx
        add ebx, 0x1000
        add edi, 8
        loop .set_entry

    mov eax, cr4
    or eax, 1 << 5
    mov cr4, eax

    mov ecx, 0xc0000080
    rdmsr
    or eax, 1 << 8
    wrmsr

    mov eax, cr0
    or eax, 1 << 31
    mov cr0, eax

    ret