arch/xtensa/include/asm/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 #if XCHAL_HAVE_S32C1I
  19 #define __smp_mb__before_atomic()               barrier()
  20 #define __smp_mb__after_atomic()                barrier()
  21 #endif
  22
  23 #include <asm-generic/barrier.h>
  24
  25 #endif /* _XTENSA_SYSTEM_H */