arch/h8300/include/asm/barrier.h

   1 #ifndef _H8300_BARRIER_H
   2 #define _H8300_BARRIER_H
   3
   4 #define nop()  asm volatile ("nop"::)
   5
   6 /*
   7  * Force strict CPU ordering.
   8  * Not really required on H8...
   9  */
  10 #define mb()   asm volatile (""   : : :"memory")
  11 #define rmb()  asm volatile (""   : : :"memory")
  12 #define wmb()  asm volatile (""   : : :"memory")
  13 #define set_mb(var, value) do { xchg(&var, value); } while (0)
  14
  15 #define read_barrier_depends()  do { } while (0)
  16
  17 #ifdef CONFIG_SMP
  18 #define smp_mb()        mb()
  19 #define smp_rmb()       rmb()
  20 #define smp_wmb()       wmb()
  21 #define smp_read_barrier_depends()      read_barrier_depends()
  22 #else
  23 #define smp_mb()        barrier()
  24 #define smp_rmb()       barrier()
  25 #define smp_wmb()       barrier()
  26 #define smp_read_barrier_depends()      do { } while(0)
  27 #endif
  28
  29 #endif /* _H8300_BARRIER_H */