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Diffstat (limited to 'gcell/ibm/sync/ppu_source/atomic.h')
| -rw-r--r-- | gcell/ibm/sync/ppu_source/atomic.h | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/gcell/ibm/sync/ppu_source/atomic.h b/gcell/ibm/sync/ppu_source/atomic.h new file mode 100644 index 000000000..105f7bf37 --- /dev/null +++ b/gcell/ibm/sync/ppu_source/atomic.h @@ -0,0 +1,112 @@ +/* -------------------------------------------------------------- */ +/* (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 */ +/* + * atomic.h - PPE atomic SHM counter operations. + * + * Interfaces patterned after, and hopefully compatible + * with PowerPC64-Linux atomic counter operations. Uses + * 32b values for various counters. + */ +#ifndef _PPU_ATOMIC_H_ +#define _PPU_ATOMIC_H_ + +#include <ppu_intrinsics.h> +#include "sync_utils.h" + +typedef unsigned int atomic_t __attribute__ ((aligned (128))); + + +/* atomic_ea_t is a 64bit effective address that points to + * an atomic_t variable + */ +typedef unsigned long long atomic_ea_t; + +/** + * ASSUMPTIONS: + * On the PPE, the size of a reservation granule is 128 bytes + * (a cache-line), so when a programmer puts a reservation on an + * address, that whole cacheline is reserved. Therefore both + * the PPE and SPE can participate in an atomic operation as long as + * lwarx and getllar operate on the same cacheline. + */ + + +/* + * atomically loads and replaces the value v with val. + * Returns the old value at v + */ +static __inline int _atomic_replace(atomic_ea_t v, int val) +{ + int old; + void *p; + + SYNC_ULL_TO_PTR(v, p); + + do { + old = (int)__lwarx(p); + } while (__stwcx(p, (unsigned int)val) == 0); + + return old; +} + + +/* + * atomically loads the value at v, adds val, replaces the + * value at v with the sum. Returns the old value at v + */ +static __inline int _atomic_modify(atomic_ea_t v, int val) +{ + int oldval, newval; + void *p; + + SYNC_ULL_TO_PTR(v, p); + + do { + oldval = (int)__lwarx(p); + newval = oldval + val; + } while (__stwcx(p, (unsigned int)newval) == 0); + + return oldval; +} + + +#endif /* _PPU_ATOMIC_H_ */ + |