atomic.h revision 1.1.20.2
1 /* $NetBSD: atomic.h,v 1.1.20.2 2006/09/09 02:40:29 rpaulo Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 Doug Rabson 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD: src/sys/ia64/include/atomic.h,v 1.10 2005/09/27 17:39:10 jhb Exp $ 29 */ 30 31 #ifndef _MACHINE_ATOMIC_H_ 32 #define _MACHINE_ATOMIC_H_ 33 34 /* 35 * Various simple arithmetic on memory which is atomic in the presence 36 * of interrupts and SMP safe. 37 */ 38 39 /* 40 * Everything is built out of cmpxchg. 41 */ 42 #define IA64_CMPXCHG(sz, sem, p, cmpval, newval, ret) \ 43 __asm __volatile ( \ 44 "mov ar.ccv=%2;;\n\t" \ 45 "cmpxchg" #sz "." #sem " %0=%4,%3,ar.ccv\n\t" \ 46 : "=r" (ret), "=m" (*p) \ 47 : "r" (cmpval), "r" (newval), "m" (*p) \ 48 : "memory") 49 50 /* 51 * Some common forms of cmpxch. 52 */ 53 static __inline uint32_t 54 ia64_cmpxchg_acq_32(volatile uint32_t* p, uint32_t cmpval, uint32_t newval) 55 { 56 uint32_t ret; 57 IA64_CMPXCHG(4, acq, p, cmpval, newval, ret); 58 return (ret); 59 } 60 61 static __inline uint32_t 62 ia64_cmpxchg_rel_32(volatile uint32_t* p, uint32_t cmpval, uint32_t newval) 63 { 64 uint32_t ret; 65 IA64_CMPXCHG(4, rel, p, cmpval, newval, ret); 66 return (ret); 67 } 68 69 static __inline uint64_t 70 ia64_cmpxchg_acq_64(volatile uint64_t* p, uint64_t cmpval, uint64_t newval) 71 { 72 uint64_t ret; 73 IA64_CMPXCHG(8, acq, p, cmpval, newval, ret); 74 return (ret); 75 } 76 77 static __inline uint64_t 78 ia64_cmpxchg_rel_64(volatile uint64_t* p, uint64_t cmpval, uint64_t newval) 79 { 80 uint64_t ret; 81 IA64_CMPXCHG(8, rel, p, cmpval, newval, ret); 82 return (ret); 83 } 84 85 #define ATOMIC_STORE_LOAD(type, width, size) \ 86 static __inline uint##width##_t \ 87 ia64_ld_acq_##width(volatile uint##width##_t* p) \ 88 { \ 89 uint##width##_t v; \ 90 __asm __volatile ("ld" size ".acq %0=%1" : "=r" (v) \ 91 : "m" (*p) : "memory"); \ 92 return (v); \ 93 } \ 94 \ 95 static __inline uint##width##_t \ 96 atomic_load_acq_##width(volatile uint##width##_t* p) \ 97 { \ 98 uint##width##_t v; \ 99 __asm __volatile ("ld" size ".acq %0=%1" : "=r" (v) \ 100 : "m" (*p) : "memory"); \ 101 return (v); \ 102 } \ 103 \ 104 static __inline uint##width##_t \ 105 atomic_load_acq_##type(volatile uint##width##_t* p) \ 106 { \ 107 uint##width##_t v; \ 108 __asm __volatile ("ld" size ".acq %0=%1" : "=r" (v) \ 109 : "m" (*p) : "memory"); \ 110 return (v); \ 111 } \ 112 \ 113 static __inline void \ 114 ia64_st_rel_##width(volatile uint##width##_t* p, uint##width##_t v) \ 115 { \ 116 __asm __volatile ("st" size ".rel %0=%1" : "=m" (*p) \ 117 : "r" (v) : "memory"); \ 118 } \ 119 \ 120 static __inline void \ 121 atomic_store_rel_##width(volatile uint##width##_t* p, \ 122 uint##width##_t v) \ 123 { \ 124 __asm __volatile ("st" size ".rel %0=%1" : "=m" (*p) \ 125 : "r" (v) : "memory"); \ 126 } \ 127 \ 128 static __inline void \ 129 atomic_store_rel_##type(volatile uint##width##_t* p, \ 130 uint##width##_t v) \ 131 { \ 132 __asm __volatile ("st" size ".rel %0=%1" : "=m" (*p) \ 133 : "r" (v) : "memory"); \ 134 } 135 136 ATOMIC_STORE_LOAD(char, 8, "1") 137 ATOMIC_STORE_LOAD(short, 16, "2") 138 ATOMIC_STORE_LOAD(int, 32, "4") 139 ATOMIC_STORE_LOAD(long, 64, "8") 140 141 #undef ATOMIC_STORE_LOAD 142 143 #define atomic_load_acq_ptr atomic_load_acq_64 144 #define atomic_store_rel_ptr atomic_store_rel_64 145 146 #define IA64_ATOMIC(sz, type, name, width, op) \ 147 static __inline type \ 148 atomic_##name##_acq_##width(volatile type *p, type v) \ 149 { \ 150 type old, ret; \ 151 do { \ 152 old = *p; \ 153 IA64_CMPXCHG(sz, acq, p, old, old op v, ret); \ 154 } while (ret != old); \ 155 return (old); \ 156 } \ 157 \ 158 static __inline type \ 159 atomic_##name##_rel_##width(volatile type *p, type v) \ 160 { \ 161 type old, ret; \ 162 do { \ 163 old = *p; \ 164 IA64_CMPXCHG(sz, rel, p, old, old op v, ret); \ 165 } while (ret != old); \ 166 return (old); \ 167 } 168 169 IA64_ATOMIC(1, uint8_t, set, 8, |) 170 IA64_ATOMIC(2, uint16_t, set, 16, |) 171 IA64_ATOMIC(4, uint32_t, set, 32, |) 172 IA64_ATOMIC(8, uint64_t, set, 64, |) 173 174 IA64_ATOMIC(1, uint8_t, clear, 8, &~) 175 IA64_ATOMIC(2, uint16_t, clear, 16, &~) 176 IA64_ATOMIC(4, uint32_t, clear, 32, &~) 177 IA64_ATOMIC(8, uint64_t, clear, 64, &~) 178 179 IA64_ATOMIC(1, uint8_t, add, 8, +) 180 IA64_ATOMIC(2, uint16_t, add, 16, +) 181 IA64_ATOMIC(4, uint32_t, add, 32, +) 182 IA64_ATOMIC(8, uint64_t, add, 64, +) 183 184 IA64_ATOMIC(1, uint8_t, subtract, 8, -) 185 IA64_ATOMIC(2, uint16_t, subtract, 16, -) 186 IA64_ATOMIC(4, uint32_t, subtract, 32, -) 187 IA64_ATOMIC(8, uint64_t, subtract, 64, -) 188 189 #undef IA64_ATOMIC 190 191 #define atomic_set_8 atomic_set_acq_8 192 #define atomic_clear_8 atomic_clear_acq_8 193 #define atomic_add_8 atomic_add_acq_8 194 #define atomic_subtract_8 atomic_subtract_acq_8 195 196 #define atomic_set_16 atomic_set_acq_16 197 #define atomic_clear_16 atomic_clear_acq_16 198 #define atomic_add_16 atomic_add_acq_16 199 #define atomic_subtract_16 atomic_subtract_acq_16 200 201 #define atomic_set_32 atomic_set_acq_32 202 #define atomic_clear_32 atomic_clear_acq_32 203 #define atomic_add_32 atomic_add_acq_32 204 #define atomic_subtract_32 atomic_subtract_acq_32 205 206 #define atomic_set_64 atomic_set_acq_64 207 #define atomic_clear_64 atomic_clear_acq_64 208 #define atomic_add_64 atomic_add_acq_64 209 #define atomic_subtract_64 atomic_subtract_acq_64 210 211 #define atomic_set_char atomic_set_8 212 #define atomic_clear_char atomic_clear_8 213 #define atomic_add_char atomic_add_8 214 #define atomic_subtract_char atomic_subtract_8 215 #define atomic_set_acq_char atomic_set_acq_8 216 #define atomic_clear_acq_char atomic_clear_acq_8 217 #define atomic_add_acq_char atomic_add_acq_8 218 #define atomic_subtract_acq_char atomic_subtract_acq_8 219 #define atomic_set_rel_char atomic_set_rel_8 220 #define atomic_clear_rel_char atomic_clear_rel_8 221 #define atomic_add_rel_char atomic_add_rel_8 222 #define atomic_subtract_rel_char atomic_subtract_rel_8 223 224 #define atomic_set_short atomic_set_16 225 #define atomic_clear_short atomic_clear_16 226 #define atomic_add_short atomic_add_16 227 #define atomic_subtract_short atomic_subtract_16 228 #define atomic_set_acq_short atomic_set_acq_16 229 #define atomic_clear_acq_short atomic_clear_acq_16 230 #define atomic_add_acq_short atomic_add_acq_16 231 #define atomic_subtract_acq_short atomic_subtract_acq_16 232 #define atomic_set_rel_short atomic_set_rel_16 233 #define atomic_clear_rel_short atomic_clear_rel_16 234 #define atomic_add_rel_short atomic_add_rel_16 235 #define atomic_subtract_rel_short atomic_subtract_rel_16 236 237 #define atomic_set_int atomic_set_32 238 #define atomic_clear_int atomic_clear_32 239 #define atomic_add_int atomic_add_32 240 #define atomic_subtract_int atomic_subtract_32 241 #define atomic_set_acq_int atomic_set_acq_32 242 #define atomic_clear_acq_int atomic_clear_acq_32 243 #define atomic_add_acq_int atomic_add_acq_32 244 #define atomic_subtract_acq_int atomic_subtract_acq_32 245 #define atomic_set_rel_int atomic_set_rel_32 246 #define atomic_clear_rel_int atomic_clear_rel_32 247 #define atomic_add_rel_int atomic_add_rel_32 248 #define atomic_subtract_rel_int atomic_subtract_rel_32 249 250 #define atomic_set_long atomic_set_64 251 #define atomic_clear_long atomic_clear_64 252 #define atomic_add_long atomic_add_64 253 #define atomic_subtract_long atomic_subtract_64 254 #define atomic_set_acq_long atomic_set_acq_64 255 #define atomic_clear_acq_long atomic_clear_acq_64 256 #define atomic_add_acq_long atomic_add_acq_64 257 #define atomic_subtract_acq_long atomic_subtract_acq_64 258 #define atomic_set_rel_long atomic_set_rel_64 259 #define atomic_clear_rel_long atomic_clear_rel_64 260 #define atomic_add_rel_long atomic_add_rel_64 261 #define atomic_subtract_rel_long atomic_subtract_rel_64 262 263 #define atomic_set_ptr atomic_set_64 264 #define atomic_clear_ptr atomic_clear_64 265 #define atomic_add_ptr atomic_add_64 266 #define atomic_subtract_ptr atomic_subtract_64 267 #define atomic_set_acq_ptr atomic_set_acq_64 268 #define atomic_clear_acq_ptr atomic_clear_acq_64 269 #define atomic_add_acq_ptr atomic_add_acq_64 270 #define atomic_subtract_acq_ptr atomic_subtract_acq_64 271 #define atomic_set_rel_ptr atomic_set_rel_64 272 #define atomic_clear_rel_ptr atomic_clear_rel_64 273 #define atomic_add_rel_ptr atomic_add_rel_64 274 #define atomic_subtract_rel_ptr atomic_subtract_rel_64 275 276 #undef IA64_CMPXCHG 277 278 /* 279 * Atomically compare the value stored at *p with cmpval and if the 280 * two values are equal, update the value of *p with newval. Returns 281 * zero if the compare failed, nonzero otherwise. 282 */ 283 static __inline int 284 atomic_cmpset_acq_32(volatile uint32_t* p, uint32_t cmpval, uint32_t newval) 285 { 286 return (ia64_cmpxchg_acq_32(p, cmpval, newval) == cmpval); 287 } 288 289 static __inline int 290 atomic_cmpset_rel_32(volatile uint32_t* p, uint32_t cmpval, uint32_t newval) 291 { 292 return (ia64_cmpxchg_rel_32(p, cmpval, newval) == cmpval); 293 } 294 295 /* 296 * Atomically compare the value stored at *p with cmpval and if the 297 * two values are equal, update the value of *p with newval. Returns 298 * zero if the compare failed, nonzero otherwise. 299 */ 300 static __inline int 301 atomic_cmpset_acq_64(volatile uint64_t* p, uint64_t cmpval, uint64_t newval) 302 { 303 return (ia64_cmpxchg_acq_64(p, cmpval, newval) == cmpval); 304 } 305 306 static __inline int 307 atomic_cmpset_rel_64(volatile uint64_t* p, uint64_t cmpval, uint64_t newval) 308 { 309 return (ia64_cmpxchg_rel_64(p, cmpval, newval) == cmpval); 310 } 311 312 #define atomic_cmpset_32 atomic_cmpset_acq_32 313 #define atomic_cmpset_64 atomic_cmpset_acq_64 314 #define atomic_cmpset_int atomic_cmpset_32 315 #define atomic_cmpset_long atomic_cmpset_64 316 #define atomic_cmpset_ptr atomic_cmpset_64 317 #define atomic_cmpset_acq_int atomic_cmpset_acq_32 318 #define atomic_cmpset_rel_int atomic_cmpset_rel_32 319 #define atomic_cmpset_acq_long atomic_cmpset_acq_64 320 #define atomic_cmpset_rel_long atomic_cmpset_rel_64 321 #define atomic_cmpset_acq_ptr atomic_cmpset_acq_64 322 #define atomic_cmpset_rel_ptr atomic_cmpset_rel_64 323 324 static __inline uint32_t 325 atomic_readandclear_32(volatile uint32_t* p) 326 { 327 uint32_t val; 328 do { 329 val = *p; 330 } while (!atomic_cmpset_32(p, val, 0)); 331 return (val); 332 } 333 334 static __inline uint64_t 335 atomic_readandclear_64(volatile uint64_t* p) 336 { 337 uint64_t val; 338 do { 339 val = *p; 340 } while (!atomic_cmpset_64(p, val, 0)); 341 return (val); 342 } 343 344 #define atomic_readandclear_int atomic_readandclear_32 345 #define atomic_readandclear_long atomic_readandclear_64 346 347 /* 348 * Atomically add the value of v to the integer pointed to by p and return 349 * the previous value of *p. 350 * 351 * XXX: Should we use the fetchadd instruction here? 352 */ 353 static __inline uint32_t 354 atomic_fetchadd_32(volatile uint32_t *p, uint32_t v) 355 { 356 uint32_t value; 357 358 do { 359 value = *p; 360 } while (!atomic_cmpset_32(p, value, value + v)); 361 return (value); 362 } 363 364 #define atomic_fetchadd_int atomic_fetchadd_32 365 366 #endif /* ! _MACHINE_ATOMIC_H_ */ 367
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