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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2011. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/*
* Description: Memory barriers for PowerPC
* Author: Rickard Green
*/
#ifndef ETHR_PPC_MEMBAR_H__
#define ETHR_PPC_MEMBAR_H__
#define ETHR_LoadLoad (1 << 0)
#define ETHR_LoadStore (1 << 1)
#define ETHR_StoreLoad (1 << 2)
#define ETHR_StoreStore (1 << 3)
static __inline__ void
ethr_lwsync__(void)
{
#ifdef ETHR_PPC_HAVE_NO_LWSYNC
__asm__ __volatile__ ("sync\n\t" : : : "memory");
#else
#ifndef ETHR_PPC_HAVE_LWSYNC
if (ETHR_PPC_RUNTIME_CONF_HAVE_NO_LWSYNC__)
__asm__ __volatile__ ("sync\n\t" : : : "memory");
else
#endif
__asm__ __volatile__ ("lwsync\n\t" : : : "memory");
#endif
}
static __inline__ void
ethr_sync__(void)
{
__asm__ __volatile__ ("sync\n\t" : : : "memory");
}
/*
* According to the "memory barrier intstructions" section of
* http://www.ibm.com/developerworks/systems/articles/powerpc.html
* we want to use sync when a StoreLoad is needed and lwsync for
* everything else.
*/
#define ETHR_MEMBAR(B) \
ETHR_CHOOSE_EXPR((B) & ETHR_StoreLoad, ethr_sync__(), ethr_lwsync__())
#endif
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