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 #define smp_read_barrier_depends() do { } while(0)
  13 #define read_barrier_depends() do { } while(0)
  14
  15 #define mb()  ({ __asm__ __volatile__("memw" : : : "memory"); })
  16 #define rmb() barrier()
  17 #define wmb() mb()
  18
  19 #ifdef CONFIG_SMP
  20 #error smp_* not defined
  21 #else
  22 #define smp_mb()        barrier()
  23 #define smp_rmb()       barrier()
  24 #define smp_wmb()       barrier()
  25 #endif
  26
  27 #define set_mb(var, value)      do { var = value; mb(); } while (0)
  28
  29 #endif /* _XTENSA_SYSTEM_H */