diff options
Diffstat (limited to 'kernel/tools/arch/s390')
| -rw-r--r-- | kernel/tools/arch/s390/include/asm/barrier.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/kernel/tools/arch/s390/include/asm/barrier.h b/kernel/tools/arch/s390/include/asm/barrier.h new file mode 100644 index 000000000..f85141266 --- /dev/null +++ b/kernel/tools/arch/s390/include/asm/barrier.h @@ -0,0 +1,30 @@ +/* + * Copied from the kernel sources: + * + * Copyright IBM Corp. 1999, 2009 + * + * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> + */ + +#ifndef __TOOLS_LINUX_ASM_BARRIER_H +#define __TOOLS_LINUX_ASM_BARRIER_H + +/* + * Force strict CPU ordering. + * And yes, this is required on UP too when we're talking + * to devices. + */ + +#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES +/* Fast-BCR without checkpoint synchronization */ +#define __ASM_BARRIER "bcr 14,0\n" +#else +#define __ASM_BARRIER "bcr 15,0\n" +#endif + +#define mb() do { asm volatile(__ASM_BARRIER : : : "memory"); } while (0) + +#define rmb() mb() +#define wmb() mb() + +#endif /* __TOOLS_LIB_ASM_BARRIER_H */ |