MAIN_BIOS_AREA_START equ 0xe0000

; Arguments:
;   -- None --
acpi_search_rsdp:
.prolog:
    push        esi
    sub         esp,                    8
    mov         esi,                    esp

    mov         [esi],                  dword 0
    mov         [esi + 4],              ecx

.search_loop_header:
    mov         ecx,                    MAIN_BIOS_AREA_START

.search_loop:
    push        ebp
    mov         ebp,                    esp
    push        ecx
    push        dword .signature
    push        dword 8
    call        mem_equal
    mov         esp,                    ebp
    pop         ebp

    cmp         ax,                     0
    jne         .rsdp_found

    add         ecx,                    16
    cmp         ecx,                    0x100000
    jb          .search_loop
    
    ; If no "RSD PTR "-signature could be found
    xor         ecx,                    ecx

.rsdp_found:
    mov         eax, ecx

.epilog:
    mov         ecx,                    [esi + 4]
    add         esp,                    8
    pop         esi

    ret

.signature:
    db "RSD PTR "