Annotation of src/sys/arch/x86/include/lock.h, Revision 1.8.4.1
1.8.4.1 ! kent 1: /* $NetBSD: lock.h,v 1.9 2005/04/16 07:45:59 yamt Exp $ */
1.1 fvdl 2:
3: /*-
4: * Copyright (c) 2000 The NetBSD Foundation, Inc.
5: * All rights reserved.
6: *
7: * This code is derived from software contributed to The NetBSD Foundation
8: * by Jason R. Thorpe.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by the NetBSD
21: * Foundation, Inc. and its contributors.
22: * 4. Neither the name of The NetBSD Foundation nor the names of its
23: * contributors may be used to endorse or promote products derived
24: * from this software without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36: * POSSIBILITY OF SUCH DAMAGE.
37: */
38:
39: /*
40: * Machine-dependent spin lock operations.
41: */
42:
1.8.4.1 ! kent 43: #ifndef _X86_LOCK_H_
! 44: #define _X86_LOCK_H_
1.1 fvdl 45:
46: #if defined(_KERNEL_OPT)
47: #include "opt_lockdebug.h"
48: #endif
49:
1.2 fvdl 50: #include <machine/cpufunc.h>
1.1 fvdl 51:
52: #ifdef LOCKDEBUG
53:
1.5 junyoung 54: extern void __cpu_simple_lock_init(__cpu_simple_lock_t *);
55: extern void __cpu_simple_lock(__cpu_simple_lock_t *);
56: extern int __cpu_simple_lock_try(__cpu_simple_lock_t *);
57: extern void __cpu_simple_unlock(__cpu_simple_lock_t *);
1.1 fvdl 58:
59: #else
60:
61: #include <machine/atomic.h>
62:
1.5 junyoung 63: static __inline void __cpu_simple_lock_init(__cpu_simple_lock_t *)
1.1 fvdl 64: __attribute__((__unused__));
1.5 junyoung 65: static __inline void __cpu_simple_lock(__cpu_simple_lock_t *)
1.1 fvdl 66: __attribute__((__unused__));
1.5 junyoung 67: static __inline int __cpu_simple_lock_try(__cpu_simple_lock_t *)
1.1 fvdl 68: __attribute__((__unused__));
1.5 junyoung 69: static __inline void __cpu_simple_unlock(__cpu_simple_lock_t *)
1.1 fvdl 70: __attribute__((__unused__));
71:
72: static __inline void
73: __cpu_simple_lock_init(__cpu_simple_lock_t *lockp)
74: {
75:
76: *lockp = __SIMPLELOCK_UNLOCKED;
1.7 yamt 77: __insn_barrier();
1.1 fvdl 78: }
79:
80: static __inline void
81: __cpu_simple_lock(__cpu_simple_lock_t *lockp)
82: {
83:
84: while (x86_atomic_testset_i(lockp, __SIMPLELOCK_LOCKED)
1.6 yamt 85: != __SIMPLELOCK_UNLOCKED) {
86: do {
87: x86_pause();
88: } while (*lockp == __SIMPLELOCK_LOCKED);
89: }
1.7 yamt 90: __insn_barrier();
1.1 fvdl 91: }
92:
93: static __inline int
94: __cpu_simple_lock_try(__cpu_simple_lock_t *lockp)
95: {
96: int r = (x86_atomic_testset_i(lockp, __SIMPLELOCK_LOCKED)
97: == __SIMPLELOCK_UNLOCKED);
98:
1.7 yamt 99: __insn_barrier();
1.1 fvdl 100:
101: return (r);
102: }
103:
104: static __inline void
105: __cpu_simple_unlock(__cpu_simple_lock_t *lockp)
106: {
107:
1.7 yamt 108: __insn_barrier();
1.1 fvdl 109: *lockp = __SIMPLELOCK_UNLOCKED;
110: }
111:
112: #endif /* !LOCKDEBUG */
1.4 yamt 113:
114: #ifdef _KERNEL
115: #define SPINLOCK_SPIN_HOOK x86_pause()
116: #endif
1.1 fvdl 117:
1.8.4.1 ! kent 118: #endif /* _X86_LOCK_H_ */
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