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 * $FreeBSD$ 27 */ 28 29 #ifndef _OPENSOLARIS_SYS_ATOMIC_H_ 30 #define _OPENSOLARIS_SYS_ATOMIC_H_ 31 32 #ifndef _STANDALONE 33 34 #include <sys/types.h> 35 #include <machine/atomic.h> 36 37 #define atomic_sub_64 atomic_subtract_64 38 39 #if defined(__i386__) && (defined(_KERNEL) || defined(KLD_MODULE)) 40 #define I386_HAVE_ATOMIC64 41 #endif 42 43 #if defined(__i386__) || defined(__amd64__) || defined(__arm__) 44 /* No spurious failures from fcmpset. */ 45 #define STRONG_FCMPSET 46 #endif 47 48 #if !defined(__LP64__) && !defined(__mips_n32) && \ 49 !defined(ARM_HAVE_ATOMIC64) && !defined(I386_HAVE_ATOMIC64) && \ 50 !defined(HAS_EMULATED_ATOMIC64) 51 extern void atomic_add_64(volatile uint64_t *target, int64_t delta); 52 extern void atomic_dec_64(volatile uint64_t *target); 53 extern uint64_t atomic_swap_64(volatile uint64_t *a, uint64_t value); 54 extern uint64_t atomic_load_64(volatile uint64_t *a); 55 extern uint64_t atomic_add_64_nv(volatile uint64_t *target, int64_t delta); 56 extern uint64_t atomic_cas_64(volatile uint64_t *target, uint64_t cmp, 57 uint64_t newval); 58 #endif 59 60 #define membar_consumer() atomic_thread_fence_acq() 61 #define membar_producer() atomic_thread_fence_rel() 62 #define membar_sync() atomic_thread_fence_seq_cst() 63 64 static __inline uint32_t 65 atomic_add_32_nv(volatile uint32_t *target, int32_t delta) 66 { 67 return (atomic_fetchadd_32(target, delta) + delta); 68 } 69 70 static __inline uint_t 71 atomic_add_int_nv(volatile uint_t *target, int delta) 72 { 73 return (atomic_add_32_nv(target, delta)); 74 } 75 76 static __inline void 77 atomic_inc_32(volatile uint32_t *target) 78 { 79 atomic_add_32(target, 1); 80 } 81 82 static __inline uint32_t 83 atomic_inc_32_nv(volatile uint32_t *target) 84 { 85 return (atomic_add_32_nv(target, 1)); 86 } 87 88 static __inline void 89 atomic_dec_32(volatile uint32_t *target) 90 { 91 atomic_subtract_32(target, 1); 92 } 93 94 static __inline uint32_t 95 atomic_dec_32_nv(volatile uint32_t *target) 96 { 97 return (atomic_add_32_nv(target, -1)); 98 } 99 100 #ifndef __sparc64__ 101 static inline uint32_t 102 atomic_cas_32(volatile uint32_t *target, uint32_t cmp, uint32_t newval) 103 { 104 #ifdef STRONG_FCMPSET 105 (void) atomic_fcmpset_32(target, &cmp, newval); 106 #else 107 uint32_t expected = cmp; 108 109 do { 110 if (atomic_fcmpset_32(target, &cmp, newval)) 111 break; 112 } while (cmp == expected); 113 #endif 114 return (cmp); 115 } 116 #endif 117 118 #if defined(__LP64__) || defined(__mips_n32) || \ 119 defined(ARM_HAVE_ATOMIC64) || defined(I386_HAVE_ATOMIC64) || \ 120 defined(HAS_EMULATED_ATOMIC64) 121 static __inline void 122 atomic_dec_64(volatile uint64_t *target) 123 { 124 atomic_subtract_64(target, 1); 125 } 126 127 static inline uint64_t 128 atomic_add_64_nv(volatile uint64_t *target, int64_t delta) 129 { 130 return (atomic_fetchadd_64(target, delta) + delta); 131 } 132 133 #ifndef __sparc64__ 134 static inline uint64_t 135 atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval) 136 { 137 #ifdef STRONG_FCMPSET 138 (void) atomic_fcmpset_64(target, &cmp, newval); 139 #else 140 uint64_t expected = cmp; 141 142 do { 143 if (atomic_fcmpset_64(target, &cmp, newval)) 144 break; 145 } while (cmp == expected); 146 #endif 147 return (cmp); 148 } 149 #endif 150 #endif 151 152 static __inline void 153 atomic_inc_64(volatile uint64_t *target) 154 { 155 atomic_add_64(target, 1); 156 } 157 158 static __inline uint64_t 159 atomic_inc_64_nv(volatile uint64_t *target) 160 { 161 return (atomic_add_64_nv(target, 1)); 162 } 163 164 static __inline uint64_t 165 atomic_dec_64_nv(volatile uint64_t *target) 166 { 167 return (atomic_add_64_nv(target, -1)); 168 } 169 170 #ifdef __LP64__ 171 static __inline void * 172 atomic_cas_ptr(volatile void *target, void *cmp, void *newval) 173 { 174 return ((void *)atomic_cas_64((volatile uint64_t *)target, 175 (uint64_t)cmp, (uint64_t)newval)); 176 } 177 #else 178 static __inline void * 179 atomic_cas_ptr(volatile void *target, void *cmp, void *newval) 180 { 181 return ((void *)atomic_cas_32((volatile uint32_t *)target, 182 (uint32_t)cmp, (uint32_t)newval)); 183 } 184 #endif /* __LP64__ */ 185 186 #else /* _STANDALONE */ 187 /* 188 * sometimes atomic_add_64 is defined, sometimes not, but the 189 * following is always right for the boot loader. 190 */ 191 #undef atomic_add_64 192 #define atomic_add_64(ptr, val) *(ptr) += val 193 #undef atomic_sub_64 194 #define atomic_sub_64(ptr, val) *(ptr) -= val 195 #endif /* !_STANDALONE */ 196 197 #endif /* !_OPENSOLARIS_SYS_ATOMIC_H_ */ 198