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64 lines
2.2 KiB
C
64 lines
2.2 KiB
C
/* $NetBSD: barrier.h,v 1.2 2014/03/18 18:20:42 riastradh Exp $ */
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/*-
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* Copyright (c) 2013 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Taylor R. Campbell.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _ASM_BARRIER_H_
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#define _ASM_BARRIER_H_
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#include <sys/atomic.h>
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#ifdef _KERNEL_OPT
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#include "opt_multiprocessor.h"
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#endif
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#define mb membar_sync
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#define wmb membar_producer
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#define rmb membar_consumer
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#ifdef __alpha__ /* XXX As if... */
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# define read_barrier_depends membar_sync
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#else
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# define read_barrier_depends() do {} while (0)
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#endif
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#ifdef MULTIPROCESSOR
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# define smp_mb mb
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# define smp_wmb wmb
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# define smp_rmb rmb
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# define smp_read_barrier_depends read_barrier_depends
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#else
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# define smp_mb() do {} while (0)
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# define smp_wmb() do {} while (0)
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# define smp_rmb() do {} while (0)
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# define smp_read_barrier_depends() do {} while (0)
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#endif
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#endif /* _ASM_BARRIER_H_ */
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