mutex.h revision 1.9 
1/*	$NetBSD: mutex.h,v 1.9 2008/04/23 13:14:11 martin Exp $	*/
2
3/*-
4 * Copyright (c) 2002, 2006 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe and Andrew Doran.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the NetBSD
21 *	Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 *    contributors may be used to endorse or promote products derived
24 *    from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39#ifndef _SPARC_MUTEX_H_
40#define	_SPARC_MUTEX_H_
41
42#ifdef __MUTEX_PRIVATE
43#include "psl.h"
44#endif
45
46struct kmutex {
47	union {
48		volatile uintptr_t	mtxa_owner;
49#ifdef __MUTEX_PRIVATE
50		struct {
51			volatile uint8_t	mtxs_dummy;
52			ipl_cookie_t		mtxs_ipl;
53                        __cpu_simple_lock_t	mtxs_lock;
54			volatile uint8_t	mtxs_unused;
55		} s;
56#endif
57	} u;
58};
59
60#ifdef __MUTEX_PRIVATE
61
62#define	mtx_owner 			u.mtxa_owner
63#define	mtx_ipl 			u.s.mtxs_ipl
64#define	mtx_lock			u.s.mtxs_lock
65
66#define	__HAVE_SIMPLE_MUTEXES		1
67
68#define	MUTEX_RECEIVE(mtx)		/* nothing */
69#define	MUTEX_GIVE(mtx)			/* nothing */
70
71#define	MUTEX_CAS(p, o, n)		\
72    (_atomic_cas_ulong((volatile unsigned long *)(p), (o), (n)) == (o))
73
74unsigned long	_atomic_cas_ulong(volatile unsigned long *,
75    unsigned long, unsigned long);
76
77#endif	/* __MUTEX_PRIVATE */
78
79#endif /* _SPARC_MUTEX_H_ */
80