tools/virtio/asm/barrier.h

   1 #if defined(__i386__) || defined(__x86_64__)
   2 #define barrier() asm volatile("" ::: "memory")
   3 #define mb() __sync_synchronize()
   4
   5 #define smp_mb()        mb()
   6 # define dma_rmb()      barrier()
   7 # define dma_wmb()      barrier()
   8 # define smp_rmb()      barrier()
   9 # define smp_wmb()      barrier()
  10 /* Weak barriers should be used. If not - it's a bug */
  11 # define rmb()  abort()
  12 # define wmb()  abort()
  13 #else
  14 #error Please fill in barrier macros
  15 #endif
  16