1/*	$NetBSD: mutex.h,v 1.5 2023/07/12 12:50:12 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 _OR1K_MUTEX_H_
33#define	_OR1K_MUTEX_H_
34
35#include <sys/types.h>
36
37#ifndef __MUTEX_PRIVATE
38
39struct kmutex {
40	uintptr_t	mtx_pad1;
41};
42
43#else	/* __MUTEX_PRIVATE */
44
45#include <machine/intr.h>
46
47struct kmutex {
48	union {
49		/* Adaptive mutex */
50		volatile uintptr_t	mtxa_owner;
51
52		/* Spin mutex */
53		struct {
54			/*
55			 * Since the low bit of mtax_owner is used to flag this
56			 * mutex as a spin mutex, we can't use the first byte
57			 * or the last byte to store the ipl or lock values.
58			 */
59			volatile uint8_t	mtxs_dummy;
60			ipl_cookie_t		mtxs_ipl;
61			__cpu_simple_lock_t	mtxs_lock;
62			volatile uint8_t	mtxs_unused;
63		} s;
64	} u;
65};
66
67#define	mtx_owner		u.mtxa_owner
68#define	mtx_ipl			u.s.mtxs_ipl
69#define	mtx_lock		u.s.mtxs_lock
70
71#if 0
72#define	__HAVE_MUTEX_STUBS		1
73#define	__HAVE_SPIN_MUTEX_STUBS		1
74#endif
75#define	__HAVE_SIMPLE_MUTEXES		1
76
77#endif	/* __MUTEX_PRIVATE */
78
79#endif /* _OR1K_MUTEX_H_ */
80