mirror of https://gitee.com/openkylin/linux.git
36 lines
1017 B
C
36 lines
1017 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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* This is very similar to the ppc eieio/sync instruction in that is
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* does a checkpoint syncronisation & makes sure that
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* all memory ops have completed wrt other CPU's ( see 7-15 POP DJB ).
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*/
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#define eieio() asm volatile("bcr 15,0" : : : "memory")
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#define SYNC_OTHER_CORES(x) eieio()
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#define mb() eieio()
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#define rmb() eieio()
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#define wmb() eieio()
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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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