1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/* $OpenBSD: armv7_mutex.c,v 1.1 2009/05/08 02:57:32 drahn Exp $ */
/*
* Copyright (c) 2004 Artur Grabowski <art@openbsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/mutex.h>
#include <sys/systm.h>
#include <machine/intr.h>
#ifdef MULTIPROCESSOR
#error This code needs work
#endif
/* rewrite with the proper lock mechanism */
/*
* Single processor systems don't need any mutexes, but they need the spl
* raising semantics of the mutexes.
*/
void
mtx_init(struct mutex *mtx, int wantipl)
{
mtx->mtx_oldipl = 0;
mtx->mtx_wantipl = wantipl;
mtx->mtx_lock = 0;
}
void
mtx_enter(struct mutex *mtx)
{
if (mtx->mtx_wantipl != IPL_NONE)
mtx->mtx_oldipl = _splraise(mtx->mtx_wantipl);
MUTEX_ASSERT_UNLOCKED(mtx);
mtx->mtx_lock = 1;
}
void
mtx_leave(struct mutex *mtx)
{
MUTEX_ASSERT_LOCKED(mtx);
mtx->mtx_lock = 0;
if (mtx->mtx_wantipl != IPL_NONE)
splx(mtx->mtx_oldipl);
}
|
