1 /*-
2 * Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. Berkeley Software Design Inc's name may not be used to endorse or
13 * promote products derived from this software without specific prior
14 * written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * from BSDI $Id: mutex.h,v 2.7.2.35 2000/04/27 03:10:26 cp Exp $
29 * $FreeBSD: releng/5.3/sys/i386/include/mutex.h 93340 2002-03-28 15:14:23Z jhb $
30 */
31
32 #ifndef _MACHINE_MUTEX_H_
33 #define _MACHINE_MUTEX_H_
34
35 #ifndef LOCORE
36
37 #ifdef _KERNEL
38
39 /* Global locks */
40 extern struct mtx clock_lock;
41
42 #endif /* _KERNEL */
43
44 #else /* !LOCORE */
45
46 /*
47 * Simple assembly macros to get and release mutexes.
48 *
49 * Note: All of these macros accept a "flags" argument and are analoguous
50 * to the mtx_lock_flags and mtx_unlock_flags general macros. If one
51 * desires to not pass a flag, the value 0 may be passed as second
52 * argument.
53 *
54 * XXX: We only have MTX_LOCK_SPIN and MTX_UNLOCK_SPIN for now, since that's
55 * all we use right now. We should add MTX_LOCK and MTX_UNLOCK (for sleep
56 * locks) in the near future, however.
57 */
58 #define MTX_LOCK_SPIN(lck, flags) \
59 pushl $0 ; \
60 pushl $0 ; \
61 pushl $flags ; \
62 pushl $lck ; \
63 call _mtx_lock_spin_flags ; \
64 addl $0x10, %esp ; \
65
66 #define MTX_UNLOCK_SPIN(lck) \
67 pushl $0 ; \
68 pushl $0 ; \
69 pushl $0 ; \
70 pushl $lck ; \
71 call _mtx_unlock_spin_flags ; \
72 addl $0x10, %esp ; \
73
74 #endif /* !LOCORE */
75 #endif /* __MACHINE_MUTEX_H */
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