1 /*- 2 * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/lock.h> 32 #include <sys/mutex.h> 33 #include <sys/atomic.h> 34 35 #ifdef _KERNEL 36 #include <sys/kernel.h> 37 38 struct mtx atomic_mtx; 39 MTX_SYSINIT(atomic, &atomic_mtx, "atomic", MTX_DEF); 40 #else 41 #include <pthread.h> 42 43 #define mtx_lock(lock) pthread_mutex_lock(lock) 44 #define mtx_unlock(lock) pthread_mutex_unlock(lock) 45 46 static pthread_mutex_t atomic_mtx; 47 48 static __attribute__((constructor)) void 49 atomic_init(void) 50 { 51 pthread_mutex_init(&atomic_mtx, NULL); 52 } 53 #endif 54 55 #ifndef __LP64__ 56 void 57 atomic_add_64(volatile uint64_t *target, int64_t delta) 58 { 59 60 mtx_lock(&atomic_mtx); 61 *target += delta; 62 mtx_unlock(&atomic_mtx); 63 } 64 #endif 65 66 uint64_t 67 atomic_add_64_nv(volatile uint64_t *target, int64_t delta) 68 { 69 uint64_t newval; 70 71 mtx_lock(&atomic_mtx); 72 newval = (*target += delta); 73 mtx_unlock(&atomic_mtx); 74 return (newval); 75 } 76 77 #if defined(__sparc64__) || defined(__powerpc__) || defined(__arm__) || \ 78 defined(__mips__) 79 void 80 atomic_or_8(volatile uint8_t *target, uint8_t value) 81 { 82 mtx_lock(&atomic_mtx); 83 *target |= value; 84 mtx_unlock(&atomic_mtx); 85 } 86 #endif 87 88 uint8_t 89 atomic_or_8_nv(volatile uint8_t *target, uint8_t value) 90 { 91 uint8_t newval; 92 93 mtx_lock(&atomic_mtx); 94 newval = (*target |= value); 95 mtx_unlock(&atomic_mtx); 96 return (newval); 97 } 98 99 #ifndef __LP64__ 100 void * 101 atomic_cas_ptr(volatile void *target, void *cmp, void *newval) 102 { 103 void *oldval, **trg; 104 105 mtx_lock(&atomic_mtx); 106 trg = __DEVOLATILE(void **, target); 107 oldval = *trg; 108 if (oldval == cmp) 109 *trg = newval; 110 mtx_unlock(&atomic_mtx); 111 return (oldval); 112 } 113 #endif 114 115 #ifndef __sparc64__ 116 uint64_t 117 atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval) 118 { 119 uint64_t oldval; 120 121 mtx_lock(&atomic_mtx); 122 oldval = *target; 123 if (oldval == cmp) 124 *target = newval; 125 mtx_unlock(&atomic_mtx); 126 return (oldval); 127 } 128 #endif 129 130 void 131 membar_producer(void) 132 { 133 /* nothing */ 134 } 135