Annotation of sys/arch/sparc/sparc/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: /*
4: * Copyright (c) 2004 Artur Grabowski <art@openbsd.org>
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: *
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. The name of the author may not be used to endorse or promote products
14: * derived from this software without specific prior written permission.
15: *
16: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
17: * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
18: * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
19: * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20: * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21: * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22: * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23: * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24: * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25: * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26: */
27:
28: #include <sys/param.h>
29: #include <sys/mutex.h>
30: #include <sys/systm.h>
31:
32: #include <machine/psl.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 << 8;
47: mtx->mtx_lock = 0;
48: }
49:
50: void
51: mtx_enter(struct mutex *mtx)
52: {
53: int psr;
54:
55: if (mtx->mtx_wantipl != IPL_NONE << 8) {
56: psr = getpsr();
57: mtx->mtx_oldipl = psr & PSR_PIL;
58: if (mtx->mtx_oldipl < mtx->mtx_wantipl)
59: setpsr((psr & ~PSR_PIL) | mtx->mtx_wantipl);
60: }
61:
62: MUTEX_ASSERT_UNLOCKED(mtx);
63: mtx->mtx_lock = 1;
64: }
65:
66: void
67: mtx_leave(struct mutex *mtx)
68: {
69: MUTEX_ASSERT_LOCKED(mtx);
70: mtx->mtx_lock = 0;
71: if (mtx->mtx_wantipl != IPL_NONE << 8)
72: splx(mtx->mtx_oldipl);
73: }
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