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/*

 * Functions for userspace irq handling.

 *

 * Copyright (C) 2009 B Labs Ltd.

 */

#include L4LIB_INC_ARCH(irq.h)

#include L4LIB_INC_ARCH(syscalls.h)

#include <l4/api/irq.h>

/*

 * Reads the irq notification slot. Destructive atomic read ensures that

 * an irq may write to the slot in sync.

 */

int l4_irq_wait(int slot, int irqnum)

{

        int irqval = l4_atomic_dest_readb(&(l4_get_utcb()->notify[slot]));

        if (!irqval)

                return l4_irq_control(IRQ_CONTROL_WAIT, 0, irqnum);

        else

                return irqval;

}