barrier.h

 1/*
 2 * This file is subject to the terms and conditions of the GNU General Public
 3 * License.  See the file "COPYING" in the main directory of this archive
 4 * for more details.
 5 *
 6 * Copyright (C) 2001 - 2012 Tensilica Inc.
 7 */
 8
 9#ifndef _XTENSA_SYSTEM_H
10#define _XTENSA_SYSTEM_H
11
12#include <asm/core.h>
13
14#define __mb()  ({ __asm__ __volatile__("memw" : : : "memory"); })
15#define __rmb() barrier()
16#define __wmb() __mb()
17
18#ifdef CONFIG_SMP
19#define __smp_mb() __mb()
20#define __smp_rmb() __rmb()
21#define __smp_wmb() __wmb()
22#endif
23
24#if XCHAL_HAVE_S32C1I
25#define __smp_mb__before_atomic()		barrier()
26#define __smp_mb__after_atomic()		barrier()
27#endif
28
29#include <asm-generic/barrier.h>
30
31#endif /* _XTENSA_SYSTEM_H */