lock.h revision 1.2.2.2
1 1.2.2.2 jdolecek /* $NetBSD: lock.h,v 1.2.2.2 2017/12/03 11:36:34 jdolecek Exp $ */ 2 1.2.2.2 jdolecek 3 1.2.2.2 jdolecek /*- 4 1.2.2.2 jdolecek * Copyright (c) 2014 The NetBSD Foundation, Inc. 5 1.2.2.2 jdolecek * All rights reserved. 6 1.2.2.2 jdolecek * 7 1.2.2.2 jdolecek * This code is derived from software contributed to The NetBSD Foundation 8 1.2.2.2 jdolecek * by Matt Thomas of 3am Software Foundry. 9 1.2.2.2 jdolecek * 10 1.2.2.2 jdolecek * Redistribution and use in source and binary forms, with or without 11 1.2.2.2 jdolecek * modification, are permitted provided that the following conditions 12 1.2.2.2 jdolecek * are met: 13 1.2.2.2 jdolecek * 1. Redistributions of source code must retain the above copyright 14 1.2.2.2 jdolecek * notice, this list of conditions and the following disclaimer. 15 1.2.2.2 jdolecek * 2. Redistributions in binary form must reproduce the above copyright 16 1.2.2.2 jdolecek * notice, this list of conditions and the following disclaimer in the 17 1.2.2.2 jdolecek * documentation and/or other materials provided with the distribution. 18 1.2.2.2 jdolecek * 19 1.2.2.2 jdolecek * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.2.2.2 jdolecek * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.2.2.2 jdolecek * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.2.2.2 jdolecek * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.2.2.2 jdolecek * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.2.2.2 jdolecek * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.2.2.2 jdolecek * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.2.2.2 jdolecek * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.2.2.2 jdolecek * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.2.2.2 jdolecek * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.2.2.2 jdolecek * POSSIBILITY OF SUCH DAMAGE. 30 1.2.2.2 jdolecek */ 31 1.2.2.2 jdolecek /* 32 1.2.2.2 jdolecek * Machine-dependent spin lock operations. 33 1.2.2.2 jdolecek */ 34 1.2.2.2 jdolecek 35 1.2.2.2 jdolecek #ifndef _OR1K_LOCK_H_ 36 1.2.2.2 jdolecek #define _OR1K_LOCK_H_ 37 1.2.2.2 jdolecek 38 1.2.2.2 jdolecek static __inline int 39 1.2.2.2 jdolecek __SIMPLELOCK_LOCKED_P(const __cpu_simple_lock_t *__ptr) 40 1.2.2.2 jdolecek { 41 1.2.2.2 jdolecek return *__ptr != __SIMPLELOCK_UNLOCKED; 42 1.2.2.2 jdolecek } 43 1.2.2.2 jdolecek 44 1.2.2.2 jdolecek static __inline int 45 1.2.2.2 jdolecek __SIMPLELOCK_UNLOCKED_P(const __cpu_simple_lock_t *__ptr) 46 1.2.2.2 jdolecek { 47 1.2.2.2 jdolecek return *__ptr == __SIMPLELOCK_UNLOCKED; 48 1.2.2.2 jdolecek } 49 1.2.2.2 jdolecek 50 1.2.2.2 jdolecek static __inline void 51 1.2.2.2 jdolecek __cpu_simple_lock_clear(__cpu_simple_lock_t *__ptr) 52 1.2.2.2 jdolecek { 53 1.2.2.2 jdolecek #if 0 54 1.2.2.2 jdolecek __atomic_clear(__ptr, __ATOMIC_RELAXED); 55 1.2.2.2 jdolecek #else 56 1.2.2.2 jdolecek *__ptr = __SIMPLELOCK_UNLOCKED; 57 1.2.2.2 jdolecek #endif 58 1.2.2.2 jdolecek } 59 1.2.2.2 jdolecek 60 1.2.2.2 jdolecek static __inline void 61 1.2.2.2 jdolecek __cpu_simple_lock_set(__cpu_simple_lock_t *__ptr) 62 1.2.2.2 jdolecek { 63 1.2.2.2 jdolecek #if 0 64 1.2.2.2 jdolecek (void)__atomic_test_and_set(__ptr, __ATOMIC_RELAXED); 65 1.2.2.2 jdolecek #else 66 1.2.2.2 jdolecek *__ptr = __SIMPLELOCK_LOCKED; 67 1.2.2.2 jdolecek #endif 68 1.2.2.2 jdolecek } 69 1.2.2.2 jdolecek 70 1.2.2.2 jdolecek static __inline void __unused 71 1.2.2.2 jdolecek __cpu_simple_lock_init(__cpu_simple_lock_t *__ptr) 72 1.2.2.2 jdolecek { 73 1.2.2.2 jdolecek #if 0 74 1.2.2.2 jdolecek __atomic_clear(__ptr, __ATOMIC_RELAXED); 75 1.2.2.2 jdolecek #else 76 1.2.2.2 jdolecek *__ptr = __SIMPLELOCK_UNLOCKED; 77 1.2.2.2 jdolecek #endif 78 1.2.2.2 jdolecek } 79 1.2.2.2 jdolecek 80 1.2.2.2 jdolecek static __inline void __unused 81 1.2.2.2 jdolecek __cpu_simple_lock(__cpu_simple_lock_t *__ptr) 82 1.2.2.2 jdolecek { 83 1.2.2.2 jdolecek #if 0 84 1.2.2.2 jdolecek while (__atomic_test_and_set(__ptr, __ATOMIC_ACQUIRE)) { 85 1.2.2.2 jdolecek /* do nothing */ 86 1.2.2.2 jdolecek } 87 1.2.2.2 jdolecek #else 88 1.2.2.2 jdolecek int tmp; 89 1.2.2.2 jdolecek __asm( 90 1.2.2.2 jdolecek "1:" 91 1.2.2.2 jdolecek "\t" "l.lwa %[tmp],0(%[ptr])" 92 1.2.2.2 jdolecek "\n\t" "l.sfeqi\t%[tmp],%[unlocked]" 93 1.2.2.2 jdolecek "\n\t" "l.bnf 1b" 94 1.2.2.2 jdolecek "\n\t" "l.nop" 95 1.2.2.2 jdolecek 96 1.2.2.2 jdolecek "\n\t" "l.swa 0(%[ptr]),%[newval]" 97 1.2.2.2 jdolecek "\n\t" "l.bnf 1b" 98 1.2.2.2 jdolecek "\n\t" "l.nop" 99 1.2.2.2 jdolecek : [tmp] "=&r" (tmp) 100 1.2.2.2 jdolecek : [newval] "r" (__SIMPLELOCK_LOCKED), 101 1.2.2.2 jdolecek [ptr] "r" (__ptr), 102 1.2.2.2 jdolecek [unlocked] "n" (__SIMPLELOCK_UNLOCKED)); 103 1.2.2.2 jdolecek #endif 104 1.2.2.2 jdolecek } 105 1.2.2.2 jdolecek 106 1.2.2.2 jdolecek static __inline int __unused 107 1.2.2.2 jdolecek __cpu_simple_lock_try(__cpu_simple_lock_t *__ptr) 108 1.2.2.2 jdolecek { 109 1.2.2.2 jdolecek #if 0 110 1.2.2.2 jdolecek return !__atomic_test_and_set(__ptr, __ATOMIC_ACQUIRE); 111 1.2.2.2 jdolecek #else 112 1.2.2.2 jdolecek int oldval; 113 1.2.2.2 jdolecek __asm( 114 1.2.2.2 jdolecek "1:" 115 1.2.2.2 jdolecek "\t" "l.lwa %[oldval],0(%[ptr])" 116 1.2.2.2 jdolecek "\n\t" "l.swa 0(%[ptr]),%[newval]" 117 1.2.2.2 jdolecek "\n\t" "l.bnf 1b" 118 1.2.2.2 jdolecek "\n\t" "l.nop" 119 1.2.2.2 jdolecek : [oldval] "=&r" (oldval) 120 1.2.2.2 jdolecek : [newval] "r" (__SIMPLELOCK_LOCKED), 121 1.2.2.2 jdolecek [ptr] "r" (__ptr)); 122 1.2.2.2 jdolecek return oldval == __SIMPLELOCK_UNLOCKED; 123 1.2.2.2 jdolecek #endif 124 1.2.2.2 jdolecek } 125 1.2.2.2 jdolecek 126 1.2.2.2 jdolecek static __inline void __unused 127 1.2.2.2 jdolecek __cpu_simple_unlock(__cpu_simple_lock_t *__ptr) 128 1.2.2.2 jdolecek { 129 1.2.2.2 jdolecek #if 0 130 1.2.2.2 jdolecek __atomic_clear(__ptr, __ATOMIC_RELEASE); 131 1.2.2.2 jdolecek #else 132 1.2.2.2 jdolecek *__ptr = __SIMPLELOCK_UNLOCKED; 133 1.2.2.2 jdolecek #endif 134 1.2.2.2 jdolecek } 135 1.2.2.2 jdolecek 136 1.2.2.2 jdolecek #endif /* _OR1K_LOCK_H_ */ 137
Indexes created Fri Oct 03 02:09:57 GMT 2025