lock.h revision 1.2
1 1.2 kochi /* $NetBSD: lock.h,v 1.2 2008/03/20 09:09:20 kochi Exp $ */ 2 1.1 cherry 3 1.1 cherry /*- 4 1.1 cherry * Copyright (c) 2000 The NetBSD Foundation, Inc. 5 1.1 cherry * All rights reserved. 6 1.1 cherry * 7 1.1 cherry * This code is derived from software contributed to The NetBSD Foundation 8 1.1 cherry * by Jason R. Thorpe. 9 1.1 cherry * 10 1.1 cherry * Redistribution and use in source and binary forms, with or without 11 1.1 cherry * modification, are permitted provided that the following conditions 12 1.1 cherry * are met: 13 1.1 cherry * 1. Redistributions of source code must retain the above copyright 14 1.1 cherry * notice, this list of conditions and the following disclaimer. 15 1.1 cherry * 2. Redistributions in binary form must reproduce the above copyright 16 1.1 cherry * notice, this list of conditions and the following disclaimer in the 17 1.1 cherry * documentation and/or other materials provided with the distribution. 18 1.1 cherry * 3. All advertising materials mentioning features or use of this software 19 1.1 cherry * must display the following acknowledgement: 20 1.1 cherry * This product includes software developed by the NetBSD 21 1.1 cherry * Foundation, Inc. and its contributors. 22 1.1 cherry * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.1 cherry * contributors may be used to endorse or promote products derived 24 1.1 cherry * from this software without specific prior written permission. 25 1.1 cherry * 26 1.1 cherry * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.1 cherry * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.1 cherry * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.1 cherry * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.1 cherry * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.1 cherry * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.1 cherry * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.1 cherry * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.1 cherry * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.1 cherry * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.1 cherry * POSSIBILITY OF SUCH DAMAGE. 37 1.1 cherry */ 38 1.1 cherry 39 1.1 cherry /* 40 1.1 cherry * Machine-dependent spin lock operations. 41 1.1 cherry */ 42 1.1 cherry 43 1.1 cherry #ifndef _IA64_LOCK_H_ 44 1.1 cherry #define _IA64_LOCK_H_ 45 1.1 cherry 46 1.2 kochi static __inline int 47 1.2 kochi __SIMPLELOCK_LOCKED_P(__cpu_simple_lock_t *__ptr) 48 1.2 kochi { 49 1.2 kochi return *__ptr == __SIMPLELOCK_LOCKED; 50 1.2 kochi } 51 1.2 kochi 52 1.2 kochi static __inline int 53 1.2 kochi __SIMPLELOCK_UNLOCKED_P(__cpu_simple_lock_t *__ptr) 54 1.2 kochi { 55 1.2 kochi return *__ptr == __SIMPLELOCK_UNLOCKED; 56 1.2 kochi } 57 1.2 kochi 58 1.2 kochi static __inline void 59 1.2 kochi __cpu_simple_lock_set(__cpu_simple_lock_t *__ptr) 60 1.2 kochi { 61 1.2 kochi 62 1.2 kochi *__ptr = __SIMPLELOCK_LOCKED; 63 1.2 kochi } 64 1.2 kochi 65 1.2 kochi static __inline void 66 1.2 kochi __cpu_simple_lock_clear(__cpu_simple_lock_t *__ptr) 67 1.2 kochi { 68 1.2 kochi 69 1.2 kochi *__ptr = __SIMPLELOCK_UNLOCKED; 70 1.2 kochi } 71 1.2 kochi 72 1.2 kochi #ifdef _KERNEL 73 1.2 kochi 74 1.2 kochi #define SPINLOCK_SPIN_HOOK /* nothing */ 75 1.2 kochi #define SPINLOCK_BACKOFF_HOOK /* XXX(kochi): hint@pause */ 76 1.2 kochi 77 1.2 kochi #endif 78 1.2 kochi 79 1.2 kochi static __inline void __cpu_simple_lock_init(__cpu_simple_lock_t *) 80 1.2 kochi __unused; 81 1.2 kochi static __inline void __cpu_simple_lock(__cpu_simple_lock_t *) 82 1.2 kochi __unused; 83 1.2 kochi static __inline int __cpu_simple_lock_try(__cpu_simple_lock_t *) 84 1.2 kochi __unused; 85 1.2 kochi static __inline void __cpu_simple_unlock(__cpu_simple_lock_t *) 86 1.2 kochi __unused; 87 1.2 kochi 88 1.2 kochi static __inline void 89 1.2 kochi __cpu_simple_lock_init(__cpu_simple_lock_t *lockp) 90 1.2 kochi { 91 1.2 kochi 92 1.2 kochi *lockp = __SIMPLELOCK_UNLOCKED; 93 1.2 kochi __insn_barrier(); 94 1.2 kochi } 95 1.2 kochi 96 1.2 kochi static __inline int 97 1.2 kochi __cpu_simple_lock_try(__cpu_simple_lock_t *lockp) 98 1.2 kochi { 99 1.2 kochi uint8_t val; 100 1.2 kochi 101 1.2 kochi val = __SIMPLELOCK_LOCKED; 102 1.2 kochi /* __asm volatile ("xchgb %0,(%2)" : 103 1.2 kochi "=r" (val) 104 1.2 kochi :"0" (val), "r" (lockp)); */ 105 1.2 kochi __insn_barrier(); 106 1.2 kochi return val == __SIMPLELOCK_UNLOCKED; 107 1.2 kochi } 108 1.2 kochi 109 1.2 kochi static __inline void 110 1.2 kochi __cpu_simple_lock(__cpu_simple_lock_t *lockp) 111 1.2 kochi { 112 1.2 kochi 113 1.2 kochi while (!__cpu_simple_lock_try(lockp)) 114 1.2 kochi /* nothing */; 115 1.2 kochi __insn_barrier(); 116 1.2 kochi } 117 1.2 kochi 118 1.2 kochi static __inline void 119 1.2 kochi __cpu_simple_unlock(__cpu_simple_lock_t *lockp) 120 1.2 kochi { 121 1.2 kochi 122 1.2 kochi __insn_barrier(); 123 1.2 kochi *lockp = __SIMPLELOCK_UNLOCKED; 124 1.2 kochi } 125 1.1 cherry 126 1.1 cherry #endif /* _IA64_LOCK_H_ */ 127
Indexes created Mon Sep 29 21:09:56 GMT 2025