81 lines
2.7 KiB
C
81 lines
2.7 KiB
C
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/* $NetBSD: mutex.h,v 1.6 2009/04/24 17:49:51 ad Exp $ */
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/*-
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* Copyright (c) 2002, 2006, 2009 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 Jason R. Thorpe and Andrew Doran.
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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 _X86_MUTEX_H_
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#define _X86_MUTEX_H_
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struct kmutex {
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union {
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volatile uintptr_t mtxa_owner;
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#ifdef __MUTEX_PRIVATE
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struct {
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volatile uint8_t mtxs_dummy;
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ipl_cookie_t mtxs_ipl;
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__cpu_simple_lock_t mtxs_lock;
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volatile uint8_t mtxs_unused;
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} s;
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#endif
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} u;
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};
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#ifdef __MUTEX_PRIVATE
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#define mtx_owner u.mtxa_owner
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#define mtx_ipl u.s.mtxs_ipl
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#define mtx_lock u.s.mtxs_lock
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#define __HAVE_MUTEX_STUBS 1
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#define __HAVE_SPIN_MUTEX_STUBS 1
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#define __HAVE_SIMPLE_MUTEXES 1
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/*
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* MUTEX_RECEIVE: technically, no memory barrier is required
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* as 'ret' implies a load fence. However we need this to
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* handle a bug with some Opteron revisions. See patch.c,
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* lock_stubs.S.
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*/
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#define MUTEX_RECEIVE(mtx) membar_consumer()
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/*
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* MUTEX_GIVE: no memory barrier required, as _lock_cas() will take care of it.
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*/
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#define MUTEX_GIVE(mtx) /* nothing */
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#define MUTEX_CAS(p, o, n) \
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(_atomic_cas_ulong((volatile unsigned long *)(p), (o), (n)) == (o))
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unsigned long _atomic_cas_ulong(volatile unsigned long *,
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unsigned long, unsigned long);
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#endif /* __MUTEX_PRIVATE */
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#endif /* _X86_MUTEX_H_ */
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