1 #ifndef BARRIER_H
2 #define BARRIER_H
3 
4 #if defined(__ia64__)
5   #define store_barrier()         asm volatile ("mf" ::: "memory")
6 #elif defined(__x86_64__)
7   #define store_barrier()         asm volatile("sfence" ::: "memory")
8 #elif defined(__i386__)
9   #define store_barrier()         asm volatile ("": : :"memory")
10 #elif defined(__ppc__) || defined(__powerpc__)
11   #define store_barrier()         asm volatile ("eieio" : : : "memory")
12 #elif defined(__s390__) || defined(__s390x__)
13   #define store_barrier()         asm volatile ("bcr 15,0" : : : "memory")
14 #elif defined(__alpha__)
15   #define store_barrier()         asm volatile("wmb": : :"memory")
16 #elif defined(__hppa__)
17   #define store_barrier()         asm volatile("":::"memory")
18 #elif defined(__sparc__)
19   #define store_barrier()         asm volatile("":::"memory")
20 #elif defined(__m68000__) || defined(__m68k__) || defined(mc68000) || defined(_M_M68K)
21   #define store_barrier()         asm volatile("":::"memory")
22 #elif defined(__mips__)  /* also mipsel */
23   #define store_barrier()         do { } while(0)
24 #elif defined(__arm__)
25   /* taken from linux/arch/arm/kernel/entry-armv.S, thanks to pbrook! */
26   typedef void (__kernel_dmb_t)(void);
27   #define __kernel_dmb (*(__kernel_dmb_t *)0xffff0fa0)
28   #define store_barrier()        __kernel_dmb()
29 #else
30   #error Define store_barrier() for your CPU
31 #endif
32 
33 #endif
34