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/*
* Copyright IBM Corp. 1999, 2009
*
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
*/
#ifndef __ASM_BARRIER_H
#define __ASM_BARRIER_H
#include <asm/alternative.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)
static inline void gmb(void)
{
asm volatile(
ALTERNATIVE("", ".long 0xb2e8f000", 81)
: : : "memory");
}
#define gmb gmb
#define rmb() barrier()
#define wmb() barrier()
#define dma_rmb() mb()
#define dma_wmb() mb()
#define smp_mb() mb()
#define smp_rmb() rmb()
#define smp_wmb() wmb()
#define read_barrier_depends() do { } while (0)
#define smp_read_barrier_depends() do { } while (0)
#define smp_mb__before_atomic() smp_mb()
#define smp_mb__after_atomic() smp_mb()
#define smp_store_mb(var, value) do { WRITE_ONCE(var, value); smp_mb(); } while (0)
#define smp_store_release(p, v) \
do { \
compiletime_assert_atomic_type(*p); \
barrier(); \
WRITE_ONCE(*p, v); \
} while (0)
#define smp_load_acquire(p) \
({ \
typeof(*p) ___p1 = READ_ONCE(*p); \
compiletime_assert_atomic_type(*p); \
barrier(); \
___p1; \
})
#endif /* __ASM_BARRIER_H */