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 #if !defined(__LP64__) && !defined(__mips_n32) && !defined(ARM_HAVE_ATOMIC64) 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 65 void 66 atomic_dec_64(volatile uint64_t *target) 67 { 68 69 mtx_lock(&atomic_mtx); 70 *target -= 1; 71 mtx_unlock(&atomic_mtx); 72 } 73 #endif 74 75 uint64_t 76 atomic_add_64_nv(volatile uint64_t *target, int64_t delta) 77 { 78 uint64_t newval; 79 80 mtx_lock(&atomic_mtx); 81 newval = (*target += delta); 82 mtx_unlock(&atomic_mtx); 83 return (newval); 84 } 85 86 #if defined(__powerpc__) || defined(__arm__) || defined(__mips__) 87 void 88 atomic_or_8(volatile uint8_t *target, uint8_t value) 89 { 90 mtx_lock(&atomic_mtx); 91 *target |= value; 92 mtx_unlock(&atomic_mtx); 93 } 94 #endif 95 96 uint8_t 97 atomic_or_8_nv(volatile uint8_t *target, uint8_t value) 98 { 99 uint8_t newval; 100 101 mtx_lock(&atomic_mtx); 102 newval = (*target |= value); 103 mtx_unlock(&atomic_mtx); 104 return (newval); 105 } 106 107 uint64_t 108 atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval) 109 { 110 uint64_t oldval; 111 112 mtx_lock(&atomic_mtx); 113 oldval = *target; 114 if (oldval == cmp) 115 *target = newval; 116 mtx_unlock(&atomic_mtx); 117 return (oldval); 118 } 119 120 uint32_t 121 atomic_cas_32(volatile uint32_t *target, uint32_t cmp, uint32_t newval) 122 { 123 uint32_t oldval; 124 125 mtx_lock(&atomic_mtx); 126 oldval = *target; 127 if (oldval == cmp) 128 *target = newval; 129 mtx_unlock(&atomic_mtx); 130 return (oldval); 131 } 132 133 void 134 membar_producer(void) 135 { 136 /* nothing */ 137 } 138