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 */