Annotation of sys/arch/sparc64/sparc64/mutex.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: mutex.c,v 1.1 2007/02/03 20:08:50 miod Exp $ */
2: /*
3: * Copyright (c) 2004 Artur Grabowski <art@openbsd.org>
4: * 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: *
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. The name of the author may not be used to endorse or promote products
13: * derived from this software without specific prior written permission.
14: *
15: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
16: * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
17: * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
18: * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
21: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
23: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
24: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25: */
26:
27: #include <sys/param.h>
28: #include <sys/mutex.h>
29: #include <sys/systm.h>
30:
31: #include <machine/psl.h>
32: #include <machine/intr.h>
33:
34: #ifdef MULTIPROCESSOR
35: #error This code needs more work
36: #endif
37:
38: /*
39: * Single processor systems don't need any mutexes, but they need the spl
40: * raising semantics of the mutexes.
41: */
42: void
43: mtx_init(struct mutex *mtx, int wantipl)
44: {
45: mtx->mtx_oldipl = 0;
46: mtx->mtx_wantipl = wantipl;
47: mtx->mtx_lock = 0;
48: }
49:
50: void
51: mtx_enter(struct mutex *mtx)
52: {
53: if (mtx->mtx_wantipl != IPL_NONE) {
54: mtx->mtx_oldipl = sparc_rdpr(pil);
55: if (mtx->mtx_oldipl < mtx->mtx_wantipl)
56: sparc_wrpr(pil, mtx->mtx_wantipl, 0);
57: }
58:
59: MUTEX_ASSERT_UNLOCKED(mtx);
60: mtx->mtx_lock = 1;
61: }
62:
63: void
64: mtx_leave(struct mutex *mtx)
65: {
66: MUTEX_ASSERT_LOCKED(mtx);
67: mtx->mtx_lock = 0;
68: if (mtx->mtx_wantipl != IPL_NONE)
69: splx(mtx->mtx_oldipl);
70: }
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