rem: remove_io_interrupt_handler(InterruptNumber,ServiceRoutine,NULL);
add: remove_io_interrupt_handler(InterruptNumber,(interrupt_handler)ServiceRoutine,NULL);
context: AcpiOsRemoveInterruptHandler (    UINT32                  InterruptNumber,    ACPI_OSD_HANDLER        ServiceRoutine){#ifdef _KERNEL_MODE	remove_io_interrupt_handler(InterruptNumber,ServiceRoutine,NULL);		/* Crap. We don't get the Context argument back. */	#warning Sketchy code!	#endif    return AE_OK;}