mutex.h revision 1.10 
1/*	$NetBSD: mutex.h,v 1.10 2008/04/28 20:23:36 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 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef _SPARC_MUTEX_H_
33#define	_SPARC_MUTEX_H_
34
35#ifdef __MUTEX_PRIVATE
36#include "psl.h"
37#endif
38
39struct kmutex {
40	union {
41		volatile uintptr_t	mtxa_owner;
42#ifdef __MUTEX_PRIVATE
43		struct {
44			volatile uint8_t	mtxs_dummy;
45			ipl_cookie_t		mtxs_ipl;
46                        __cpu_simple_lock_t	mtxs_lock;
47			volatile uint8_t	mtxs_unused;
48		} s;
49#endif
50	} u;
51};
52
53#ifdef __MUTEX_PRIVATE
54
55#define	mtx_owner 			u.mtxa_owner
56#define	mtx_ipl 			u.s.mtxs_ipl
57#define	mtx_lock			u.s.mtxs_lock
58
59#define	__HAVE_SIMPLE_MUTEXES		1
60
61#define	MUTEX_RECEIVE(mtx)		/* nothing */
62#define	MUTEX_GIVE(mtx)			/* nothing */
63
64#define	MUTEX_CAS(p, o, n)		\
65    (_atomic_cas_ulong((volatile unsigned long *)(p), (o), (n)) == (o))
66
67unsigned long	_atomic_cas_ulong(volatile unsigned long *,
68    unsigned long, unsigned long);
69
70#endif	/* __MUTEX_PRIVATE */
71
72#endif /* _SPARC_MUTEX_H_ */
73