mutex.h revision 1.12 
1/*	$NetBSD: mutex.h,v 1.12 2023/07/09 17:03:10 riastradh 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 *
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 _SH3_MUTEX_H_
33#define	_SH3_MUTEX_H_
34
35#ifndef __MUTEX_PRIVATE
36
37struct kmutex {
38	uintptr_t	mtx_pad1;
39};
40
41#else	/* __MUTEX_PRIVATE */
42
43#include <machine/intr.h>
44#include <machine/lock.h>
45
46struct kmutex {
47	union {
48		/* Adaptive mutex */
49		volatile uintptr_t	mtxa_owner;	/* 0-3 */
50
51		/* Spin mutex */
52		struct {
53			volatile uint8_t	mtxs_dummy;
54			ipl_cookie_t		mtxs_ipl;
55			__cpu_simple_lock_t	mtxs_lock;
56			volatile uint8_t	mtxs_unused;
57		} s;
58	} u;
59};
60
61#define	mtx_owner		u.mtxa_owner
62#define	mtx_ipl			u.s.mtxs_ipl
63#define	mtx_lock		u.s.mtxs_lock
64
65#define	__HAVE_SIMPLE_MUTEXES		1
66#define	__HAVE_MUTEX_STUBS		1
67
68#endif	/* __MUTEX_PRIVATE */
69
70#endif /* _SH3_MUTEX_H_ */
71