diff options
Diffstat (limited to 'gcell/ibm/sync/spu_source/read_unlock.h')
| -rw-r--r-- | gcell/ibm/sync/spu_source/read_unlock.h | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/gcell/ibm/sync/spu_source/read_unlock.h b/gcell/ibm/sync/spu_source/read_unlock.h new file mode 100644 index 0000000000..f011550e55 --- /dev/null +++ b/gcell/ibm/sync/spu_source/read_unlock.h @@ -0,0 +1,88 @@ +/* -------------------------------------------------------------- */ +/* (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_READ_UNLOCK_H_ +#define _SPU_READ_UNLOCK_H_ + +#include "sync_utils.h" +#include "mutex.h" +#include <spu_mfcio.h> + + +/** + * read_unlock - release reader lock. + * @ea: handle to effective address of lock variable. + * + * Description: Release a reader lock. The only restriction + * here is that @ea must be word aligned. + * + * Context: This routine should be used when interrupts + * do not need to be re-enabled --either because interrupts + * are not being used, or because the application will take + * steps to re-enable them later. + */ +static __inline void _read_unlock(eaddr_t ea) +{ + DECL_MUTEX_VARS(); + s32 status; + + /* _read_unlock + * + * Reader locks must use PUTLLC when releasing, instead of + * the more traditional PUTLLUC because of the non-exclusive + * nature of the lock. The reason for this is that other + * readers may have incremented the counter, and we don't + * want to corrupt it by blindly issuing PUTLLUC!! + */ + ea64.ull = ALIGN128_EA(ea); + offset = OFFSET128_EA_U32(ea); + do { + MFC_DMA(buf, ea64, size, tagid, MFC_GETLLAR_CMD); + spu_readch(MFC_RdAtomicStat); + + buf[offset] -= 1; + MFC_DMA(buf, ea64, size, tagid, MFC_PUTLLC_CMD); + status = spu_readch(MFC_RdAtomicStat); + } while (status != 0); + +} + + +#endif /* _SPU_READ_UNLOCK_H_ */ |