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/* -------------------------------------------------------------- */
/* (C)Copyright 2001,2007, */
/* International Business Machines Corporation, */
/* Sony Computer Entertainment, Incorporated, */
/* Toshiba Corporation, */
/* */
/* All Rights Reserved. */
/* */
/* Redistribution and use in source and binary forms, with or */
/* without modification, are permitted provided that the */
/* following conditions are met: */
/* */
/* - Redistributions of source code must retain the above copyright*/
/* notice, this list of conditions and the following disclaimer. */
/* */
/* - Redistributions in binary form must reproduce the above */
/* copyright notice, this list of conditions and the following */
/* disclaimer in the documentation and/or other materials */
/* provided with the distribution. */
/* */
/* - Neither the name of IBM Corporation nor the names of its */
/* contributors may be used to endorse or promote products */
/* derived from this software without specific prior written */
/* permission. */
/* */
/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND */
/* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, */
/* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */
/* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE */
/* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR */
/* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT */
/* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; */
/* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) */
/* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */
/* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR */
/* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */
/* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/* -------------------------------------------------------------- */
/* PROLOG END TAG zYx */
#ifndef _SPU_ATOMIC_READ_H_
#define _SPU_ATOMIC_READ_H_
#include <sync_utils.h>
#include <atomic.h>
/**
* atomic_read - read an atomic counter.
* @v: handle to effective address of counter.
*
* Read the current value of an atomic counter.
*/
static __inline int _atomic_read(atomic_ea_t v)
{
DECL_ATOMIC_VARS();
/* reserve a tag for use */
tagid = mfc_tag_reserve();
u32 oldtmask, tagmask = 1 << (tagid & 31);
ea64.ull = ALIGN128_EA(v);
offset = OFFSET128_EA_U32(v);
MFC_DMA(buf, ea64, size, tagid & 31, MFC_GET_CMD);
oldtmask = spu_readch(MFC_RdTagMask);
spu_writech(MFC_WrTagMask, tagmask);
spu_writech(MFC_WrTagUpdate, MFC_TAG_UPDATE_ANY);
spu_readch(MFC_RdTagStat);
spu_writech(MFC_WrTagMask, oldtmask);
mfc_tag_release (tagid);
ret_val = buf[offset];
return ret_val;
}
#endif /* _SPU_ATOMIC_READ_H_ */
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