e5b8d7553f
If the kernel gets compiled for at least z196, make use of the fast-BCR facility. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
39 lines
891 B
C
39 lines
891 B
C
/*
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* Copyright IBM Corp. 1999, 2009
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*
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#ifndef __ASM_BARRIER_H
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#define __ASM_BARRIER_H
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/*
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* Force strict CPU ordering.
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* And yes, this is required on UP too when we're talking
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* to devices.
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*/
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static inline void mb(void)
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{
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#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
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/* Fast-BCR without checkpoint synchronization */
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asm volatile("bcr 14,0" : : : "memory");
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#else
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asm volatile("bcr 15,0" : : : "memory");
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#endif
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}
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#define rmb() mb()
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#define wmb() mb()
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#define read_barrier_depends() do { } while(0)
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#define smp_mb() mb()
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#define smp_rmb() rmb()
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#define smp_wmb() wmb()
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#define smp_read_barrier_depends() read_barrier_depends()
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#define smp_mb__before_clear_bit() smp_mb()
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#define smp_mb__after_clear_bit() smp_mb()
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#define set_mb(var, value) do { var = value; mb(); } while (0)
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#endif /* __ASM_BARRIER_H */
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