1/*	$OpenBSD: mplock.h,v 1.13 2019/04/23 13:35:12 visa Exp $	*/
2
3/*
4 * Copyright (c) 2004 Niklas Hallqvist.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#ifndef _MPLOCK_H_
28#define _MPLOCK_H_
29
30#include <machine/mplock.h>
31
32#ifdef __USE_MI_MPLOCK
33
34#include <sys/_lock.h>
35
36struct __mp_lock_cpu {
37	u_int			mplc_ticket;
38	u_int			mplc_depth;
39};
40
41struct __mp_lock {
42	struct __mp_lock_cpu	mpl_cpus[MAXCPUS];
43	volatile u_int		mpl_ticket;
44	u_int			mpl_users;
45#ifdef WITNESS
46	struct lock_object	mpl_lock_obj;
47#endif
48};
49
50void	___mp_lock_init(struct __mp_lock *, const struct lock_type *);
51void	__mp_lock(struct __mp_lock *);
52void	__mp_unlock(struct __mp_lock *);
53int	__mp_release_all(struct __mp_lock *);
54int	__mp_release_all_but_one(struct __mp_lock *);
55void	__mp_acquire_count(struct __mp_lock *, int);
56int	__mp_lock_held(struct __mp_lock *, struct cpu_info *);
57
58#ifdef WITNESS
59
60#define __mp_lock_init(mpl) do {					\
61	static const struct lock_type __lock_type = { .lt_name = #mpl };\
62	___mp_lock_init((mpl), &__lock_type);				\
63} while (0)
64
65#else /* WITNESS */
66
67#define __mp_lock_init(mpl)	___mp_lock_init((mpl), NULL)
68
69#endif /* WITNESS */
70
71#endif /* __USE_MI_MPLOCK */
72
73extern struct __mp_lock kernel_lock;
74
75#endif /* !_MPLOCK_H */
76