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/* PROLOG END TAG zYx                                              */
/*
 * irq.h - SPU interrupt management facilities.
 * 
 * These utilities help an "interrupt aware" library to manage
 * state of SPU interrupts.  
 */

#ifndef __SPU_IRQ_H__
#define __SPU_IRQ_H__

#include <spu_intrinsics.h>
#include "sync_utils.h"

static inline u32 irq_mask(u32 newmask)
{
    u32 old, tmp = 0;

    /* irq_mask
     *    Set the interrupt mask to the newmask value,
     *    and return its previous setting.  Will
     *    detect and discard potential phantom
     *    events.
     */

    old = spu_readch(SPU_RdEventMask);
    spu_writech(SPU_WrEventMask, tmp);
    if (spu_readchcnt(SPU_RdEventStat)) {
        tmp = spu_readch(SPU_RdEventStat);
        spu_writech(SPU_WrEventAck, tmp);
    }
    spu_writech(SPU_WrEventMask, newmask);

    return old;
}

#endif /* __SPU_IRQ_H__ */