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Viewing changes to gcell/ibm/sync/spu_source/atomic_read.h

  • Committer: Package Import Robot
  • Author(s): A. Maitland Bottoms
  • Date: 2012-02-26 21:26:16 UTC
  • mfrom: (1.1.4)
  • Revision ID: package-import@ubuntu.com-20120226212616-vsfkbi1158xshdql
Tags: 3.5.1-1
http://bugs.debian.org/642716
http://bugs.debian.org/645332
http://bugs.debian.org/394849
http://bugs.debian.org/616832
http://bugs.debian.org/590048
http://bugs.debian.org/642580
* new upstream version, re-packaged from scratch with modern tools
    closes: #642716, #645332, #394849, #616832, #590048, #642580,
    #647018, #557050, #559640, #631863
* CMake build

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