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proc disable_irq stdcall, irq_line:dword

        mov     ebx, [irq_line]

        cmp     [irq_mode], IRQ_APIC

        je      .APIC

        mov     edx, 0x21

        cmp     ebx, 8

        jb      @F

        mov     edx, 0xA1

        sub     ebx, 8

@@:

        in      al, dx

        bts     eax, ebx

        out     dx, al

        ret

.APIC:

        shl     ebx, 1

        add     ebx, 0x10

        mov     eax, ebx

        call    IOAPIC_read

        or      eax, 0x10000; bit 16

        xchg    eax, ebx

        call    IOAPIC_write

        ret

endp