mutex.h revision 1.4 
1/*	$NetBSD: mutex.h,v 1.4 2007/03/11 05:22:25 thorpej Exp $	*/
2
3/*-
4 * Copyright (c) 2002, 2007 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 _M68K_MUTEX_H_
40#define	_M68K_MUTEX_H_
41
42#ifndef __MUTEX_PRIVATE
43
44struct kmutex {
45	uintptr_t	mtx_pad1;
46	uint32_t	mtx_pad2;
47};
48
49#else	/* __MUTEX_PRIVATE */
50
51#include <machine/lock.h>
52
53struct kmutex {
54	union {
55		/* Adaptive mutex */
56		volatile uintptr_t	mtxu_owner;	/* 0-3 */
57
58		struct {
59			ipl_cookie_t		mtxs_ipl;	/* 0-1 */
60			__cpu_simple_lock_t	mtxs_lock;	/* 2 */
61			uint8_t			mtxs_unused;	/* 3 */
62		} s;
63	} u;
64	volatile uint32_t	mtx_id;			/* 4-7 */
65};
66
67#define	mtx_owner		u.mtxu_owner
68#define	mtx_ipl			u.s.mtxs_ipl
69#define	mtx_lock		u.s.mtxs_lock
70
71#define	__HAVE_SIMPLE_MUTEXES		1
72#define	__HAVE_MUTEX_STUBS		1
73
74#define	MUTEX_RECEIVE(mtx)		mb_read()
75#define	MUTEX_GIVE(mtx)			mb_memory()
76
77#define	MUTEX_CAS(p, o, n)		_lock_cas((p), (o), (n))
78
79int	_lock_cas(volatile uintptr_t *, uintptr_t, uintptr_t);
80
81#endif	/* __MUTEX_PRIVATE */
82
83#endif /* _M68K_MUTEX_H_ */
84
85