diff options
Diffstat (limited to 'gcell/ibm/sync/spu_source/atomic_read.h')
| -rw-r--r-- | gcell/ibm/sync/spu_source/atomic_read.h | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/gcell/ibm/sync/spu_source/atomic_read.h b/gcell/ibm/sync/spu_source/atomic_read.h new file mode 100644 index 000000000..711a0ad26 --- /dev/null +++ b/gcell/ibm/sync/spu_source/atomic_read.h @@ -0,0 +1,78 @@ +/* -------------------------------------------------------------- */ +/* (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_ */ |