Annotation of sys/arch/m88k/include/lock.h, Revision 1.1.1.1
1.1 nbrk 1: #ifndef _M88K_LOCK_H_
2: #define _M88K_LOCK_H_
3: /* $OpenBSD: lock.h,v 1.3 2007/05/19 16:58:43 miod Exp $ */
4:
5: /*
6: * Copyright (c) 2005, Miodrag Vallat.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19: * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20: * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
21: * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22: * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23: * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
25: * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
26: * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27: * POSSIBILITY OF SUCH DAMAGE.
28: */
29:
30: #include <m88k/asm.h>
31:
32: typedef volatile u_int __cpu_simple_lock_t;
33:
34: /* do not change these - code below assumes r0 == __SIMPLELOCK_UNLOCKED */
35: #define __SIMPLELOCK_LOCKED 1
36: #define __SIMPLELOCK_UNLOCKED 0
37:
38: static __inline__ void
39: __cpu_simple_lock_init(__cpu_simple_lock_t *l)
40: {
41: *l = __SIMPLELOCK_UNLOCKED;
42: }
43:
44: static __inline__ void
45: __cpu_simple_lock(__cpu_simple_lock_t *l)
46: {
47: __cpu_simple_lock_t old;
48:
49: do {
50: old = __SIMPLELOCK_LOCKED;
51: __asm__ __volatile__
52: ("xmem %0, %1, r0" : "+r" (old) : "r" (l));
53: } while (old != __SIMPLELOCK_UNLOCKED);
54: }
55:
56: static __inline__ int
57: __cpu_simple_lock_try(__cpu_simple_lock_t *l)
58: {
59: __cpu_simple_lock_t old = __SIMPLELOCK_LOCKED;
60:
61: __asm__ __volatile__
62: ("xmem %0, %1, r0" : "+r" (old) : "r" (l));
63:
64: return (old == __SIMPLELOCK_UNLOCKED);
65: }
66:
67: static __inline__ void
68: __cpu_simple_unlock(__cpu_simple_lock_t *l)
69: {
70: *l = __SIMPLELOCK_UNLOCKED;
71: }
72:
73: #endif /* _M88K_LOCK_H_ */
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