arch/frv/include/asm/barrier.h

   1 /* FR-V CPU memory barrier definitions
   2  *
   3  * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #ifndef _ASM_BARRIER_H
  13 #define _ASM_BARRIER_H
  14
  15 #define nop()                   asm volatile ("nop"::)
  16
  17 #define mb()                    asm volatile ("membar" : : :"memory")
  18 #define rmb()                   asm volatile ("membar" : : :"memory")
  19 #define wmb()                   asm volatile ("membar" : : :"memory")
  20 #define read_barrier_depends()  do { } while (0)
  21
  22 #define smp_mb()                        barrier()
  23 #define smp_rmb()                       barrier()
  24 #define smp_wmb()                       barrier()
  25 #define smp_read_barrier_depends()      do {} while(0)
  26 #define set_mb(var, value) \
  27         do { var = (value); barrier(); } while (0)
  28
  29 #endif /* _ASM_BARRIER_H */