NetBSD/sys/arch/sparc/include/mutex.h

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/* $NetBSD: mutex.h,v 1.9 2008/04/23 13:14:11 martin Exp $ */
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/*-
* Copyright (c) 2002, 2006 The NetBSD Foundation, Inc.
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* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe and Andrew Doran.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _SPARC_MUTEX_H_
#define _SPARC_MUTEX_H_
#ifdef __MUTEX_PRIVATE
#include "psl.h"
#endif
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struct kmutex {
union {
volatile uintptr_t mtxa_owner;
#ifdef __MUTEX_PRIVATE
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struct {
volatile uint8_t mtxs_dummy;
ipl_cookie_t mtxs_ipl;
__cpu_simple_lock_t mtxs_lock;
volatile uint8_t mtxs_unused;
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} s;
#endif
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} u;
};
#ifdef __MUTEX_PRIVATE
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#define mtx_owner u.mtxa_owner
#define mtx_ipl u.s.mtxs_ipl
#define mtx_lock u.s.mtxs_lock
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#define __HAVE_SIMPLE_MUTEXES 1
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#define MUTEX_RECEIVE(mtx) /* nothing */
#define MUTEX_GIVE(mtx) /* nothing */
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#define MUTEX_CAS(p, o, n) \
(_atomic_cas_ulong((volatile unsigned long *)(p), (o), (n)) == (o))
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unsigned long _atomic_cas_ulong(volatile unsigned long *,
unsigned long, unsigned long);
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#endif /* __MUTEX_PRIVATE */
#endif /* _SPARC_MUTEX_H_ */