LXR linux/arch/avr32/include/asm/barrier.h

   1/*
   2 * Copyright (C) 2004-2006 Atmel Corporation
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 */
   8#ifndef __ASM_AVR32_BARRIER_H
   9#define __ASM_AVR32_BARRIER_H
  10
  11#define nop()                   asm volatile("nop")
  12
  13#define mb()                    asm volatile("" : : : "memory")
  14#define rmb()                   mb()
  15#define wmb()                   asm volatile("sync 0" : : : "memory")
  16#define read_barrier_depends()  do { } while(0)
  17#define set_mb(var, value)      do { var = value; mb(); } while(0)
  18
  19#ifdef CONFIG_SMP
  20# error "The AVR32 port does not support SMP"
  21#else
  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#endif
  27
  28
  29#endif /* __ASM_AVR32_BARRIER_H */
  30