1/* $OpenBSD: mplock.h,v 1.7 2024/09/04 07:54:51 mglocker 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 _POWERPC_MPLOCK_H_
28#define _POWERPC_MPLOCK_H_
29
30#define __USE_MI_MPLOCK
31
32/*
33 * __ppc_lock exists because pte_spill_r() can't use __mp_lock.
34 * Really simple spinlock implementation with recursive capabilities.
35 * Correctness is paramount, no fanciness allowed.
36 */
37
38struct __ppc_lock {
39 struct cpu_info *volatile mpl_cpu;
40 long mpl_count;
41};
42
43#ifndef _LOCORE
44
45#define PPC_LOCK_INITIALIZER { NULL, 0 }
46
47void __ppc_lock(struct __ppc_lock *);
48void __ppc_unlock(struct __ppc_lock *);
49
50#endif
51
52#endif /* !_POWERPC_MPLOCK_H */