Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/amd64/include/atomic.h
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1 /*- 2 * Copyright (c) 1998 Doug Rabson 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 AUTHOR 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 AUTHOR 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: releng/7.4/sys/amd64/include/atomic.h 197986 2009-10-12 16:11:25Z attilio $ 27 */ 28 #ifndef _MACHINE_ATOMIC_H_ 29 #define _MACHINE_ATOMIC_H_ 30 31 #ifndef _SYS_CDEFS_H_ 32 #error this file needs sys/cdefs.h as a prerequisite 33 #endif 34 35 /* 36 * Various simple operations on memory, each of which is atomic in the 37 * presence of interrupts and multiple processors. 38 * 39 * atomic_set_char(P, V) (*(u_char *)(P) |= (V)) 40 * atomic_clear_char(P, V) (*(u_char *)(P) &= ~(V)) 41 * atomic_add_char(P, V) (*(u_char *)(P) += (V)) 42 * atomic_subtract_char(P, V) (*(u_char *)(P) -= (V)) 43 * 44 * atomic_set_short(P, V) (*(u_short *)(P) |= (V)) 45 * atomic_clear_short(P, V) (*(u_short *)(P) &= ~(V)) 46 * atomic_add_short(P, V) (*(u_short *)(P) += (V)) 47 * atomic_subtract_short(P, V) (*(u_short *)(P) -= (V)) 48 * 49 * atomic_set_int(P, V) (*(u_int *)(P) |= (V)) 50 * atomic_clear_int(P, V) (*(u_int *)(P) &= ~(V)) 51 * atomic_add_int(P, V) (*(u_int *)(P) += (V)) 52 * atomic_subtract_int(P, V) (*(u_int *)(P) -= (V)) 53 * atomic_readandclear_int(P) (return (*(u_int *)(P)); *(u_int *)(P) = 0;) 54 * 55 * atomic_set_long(P, V) (*(u_long *)(P) |= (V)) 56 * atomic_clear_long(P, V) (*(u_long *)(P) &= ~(V)) 57 * atomic_add_long(P, V) (*(u_long *)(P) += (V)) 58 * atomic_subtract_long(P, V) (*(u_long *)(P) -= (V)) 59 * atomic_readandclear_long(P) (return (*(u_long *)(P)); *(u_long *)(P) = 0;) 60 */ 61 62 /* 63 * The above functions are expanded inline in the statically-linked 64 * kernel. Lock prefixes are generated if an SMP kernel is being 65 * built. 66 * 67 * Kernel modules call real functions which are built into the kernel. 68 * This allows kernel modules to be portable between UP and SMP systems. 69 */ 70 #if defined(KLD_MODULE) || !defined(__GNUCLIKE_ASM) 71 #define ATOMIC_ASM(NAME, TYPE, OP, CONS, V) \ 72 void atomic_##NAME##_##TYPE(volatile u_##TYPE *p, u_##TYPE v); \ 73 void atomic_##NAME##_barr_##TYPE(volatile u_##TYPE *p, u_##TYPE v) 74 75 int atomic_cmpset_int(volatile u_int *dst, u_int exp, u_int src); 76 int atomic_cmpset_long(volatile u_long *dst, u_long exp, u_long src); 77 u_int atomic_fetchadd_int(volatile u_int *p, u_int v); 78 u_long atomic_fetchadd_long(volatile u_long *p, u_long v); 79 80 #define ATOMIC_STORE_LOAD(TYPE, LOP, SOP) \ 81 u_##TYPE atomic_load_acq_##TYPE(volatile u_##TYPE *p); \ 82 void atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v) 83 84 #else /* !KLD_MODULE && __GNUCLIKE_ASM */ 85 86 /* 87 * For userland, always use lock prefixes so that the binaries will run 88 * on both SMP and !SMP systems. 89 */ 90 #if defined(SMP) || !defined(_KERNEL) 91 #define MPLOCKED "lock ; " 92 #else 93 #define MPLOCKED 94 #endif 95 96 /* 97 * The assembly is volatilized to avoid code chunk removal by the compiler. 98 * GCC aggressively reorders operations and memory clobbering is necessary 99 * in order to avoid that for memory barriers. 100 */ 101 #define ATOMIC_ASM(NAME, TYPE, OP, CONS, V) \ 102 static __inline void \ 103 atomic_##NAME##_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\ 104 { \ 105 __asm __volatile(MPLOCKED OP \ 106 : "=m" (*p) \ 107 : CONS (V), "m" (*p)); \ 108 } \ 109 \ 110 static __inline void \ 111 atomic_##NAME##_barr_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\ 112 { \ 113 __asm __volatile(MPLOCKED OP \ 114 : "=m" (*p) \ 115 : CONS (V), "m" (*p) \ 116 : "memory"); \ 117 } \ 118 struct __hack 119 120 /* 121 * Atomic compare and set, used by the mutex functions 122 * 123 * if (*dst == exp) *dst = src (all 32 bit words) 124 * 125 * Returns 0 on failure, non-zero on success 126 */ 127 128 static __inline int 129 atomic_cmpset_int(volatile u_int *dst, u_int exp, u_int src) 130 { 131 u_char res; 132 133 __asm __volatile( 134 " " MPLOCKED " " 135 " cmpxchgl %2,%1 ; " 136 " sete %0 ; " 137 "1: " 138 "# atomic_cmpset_int" 139 : "=a" (res), /* 0 */ 140 "=m" (*dst) /* 1 */ 141 : "r" (src), /* 2 */ 142 "a" (exp), /* 3 */ 143 "m" (*dst) /* 4 */ 144 : "memory"); 145 146 return (res); 147 } 148 149 static __inline int 150 atomic_cmpset_long(volatile u_long *dst, u_long exp, u_long src) 151 { 152 u_char res; 153 154 __asm __volatile( 155 " " MPLOCKED " " 156 " cmpxchgq %2,%1 ; " 157 " sete %0 ; " 158 "1: " 159 "# atomic_cmpset_long" 160 : "=a" (res), /* 0 */ 161 "=m" (*dst) /* 1 */ 162 : "r" (src), /* 2 */ 163 "a" (exp), /* 3 */ 164 "m" (*dst) /* 4 */ 165 : "memory"); 166 167 return (res); 168 } 169 170 /* 171 * Atomically add the value of v to the integer pointed to by p and return 172 * the previous value of *p. 173 */ 174 static __inline u_int 175 atomic_fetchadd_int(volatile u_int *p, u_int v) 176 { 177 178 __asm __volatile( 179 " " MPLOCKED " " 180 " xaddl %0, %1 ; " 181 "# atomic_fetchadd_int" 182 : "+r" (v), /* 0 (result) */ 183 "=m" (*p) /* 1 */ 184 : "m" (*p)); /* 2 */ 185 186 return (v); 187 } 188 189 /* 190 * Atomically add the value of v to the long integer pointed to by p and return 191 * the previous value of *p. 192 */ 193 static __inline u_long 194 atomic_fetchadd_long(volatile u_long *p, u_long v) 195 { 196 197 __asm __volatile( 198 " " MPLOCKED " " 199 " xaddq %0, %1 ; " 200 "# atomic_fetchadd_long" 201 : "+r" (v), /* 0 (result) */ 202 "=m" (*p) /* 1 */ 203 : "m" (*p)); /* 2 */ 204 205 return (v); 206 } 207 208 #if defined(_KERNEL) && !defined(SMP) 209 210 /* 211 * We assume that a = b will do atomic loads and stores. However, on a 212 * PentiumPro or higher, reads may pass writes, so for that case we have 213 * to use a serializing instruction (i.e. with LOCK) to do the load in 214 * SMP kernels. For UP kernels, however, the cache of the single processor 215 * is always consistent, so we only need to take care of compiler. 216 */ 217 #define ATOMIC_STORE_LOAD(TYPE, LOP, SOP) \ 218 static __inline u_##TYPE \ 219 atomic_load_acq_##TYPE(volatile u_##TYPE *p) \ 220 { \ 221 u_##TYPE tmp; \ 222 \ 223 tmp = *p; \ 224 __asm __volatile ("" : : : "memory"); \ 225 return (tmp); \ 226 } \ 227 \ 228 static __inline void \ 229 atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\ 230 { \ 231 __asm __volatile ("" : : : "memory"); \ 232 *p = v; \ 233 } \ 234 struct __hack 235 236 #else /* !(_KERNEL && !SMP) */ 237 238 #define ATOMIC_STORE_LOAD(TYPE, LOP, SOP) \ 239 static __inline u_##TYPE \ 240 atomic_load_acq_##TYPE(volatile u_##TYPE *p) \ 241 { \ 242 u_##TYPE res; \ 243 \ 244 __asm __volatile(MPLOCKED LOP \ 245 : "=a" (res), /* 0 */ \ 246 "=m" (*p) /* 1 */ \ 247 : "m" (*p) /* 2 */ \ 248 : "memory"); \ 249 \ 250 return (res); \ 251 } \ 252 \ 253 /* \ 254 * The XCHG instruction asserts LOCK automagically. \ 255 */ \ 256 static __inline void \ 257 atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\ 258 { \ 259 __asm __volatile(SOP \ 260 : "=m" (*p), /* 0 */ \ 261 "+r" (v) /* 1 */ \ 262 : "m" (*p) /* 2 */ \ 263 : "memory"); \ 264 } \ 265 struct __hack 266 267 #endif /* _KERNEL && !SMP */ 268 269 #endif /* KLD_MODULE || !__GNUCLIKE_ASM */ 270 271 ATOMIC_ASM(set, char, "orb %b1,%0", "iq", v); 272 ATOMIC_ASM(clear, char, "andb %b1,%0", "iq", ~v); 273 ATOMIC_ASM(add, char, "addb %b1,%0", "iq", v); 274 ATOMIC_ASM(subtract, char, "subb %b1,%0", "iq", v); 275 276 ATOMIC_ASM(set, short, "orw %w1,%0", "ir", v); 277 ATOMIC_ASM(clear, short, "andw %w1,%0", "ir", ~v); 278 ATOMIC_ASM(add, short, "addw %w1,%0", "ir", v); 279 ATOMIC_ASM(subtract, short, "subw %w1,%0", "ir", v); 280 281 ATOMIC_ASM(set, int, "orl %1,%0", "ir", v); 282 ATOMIC_ASM(clear, int, "andl %1,%0", "ir", ~v); 283 ATOMIC_ASM(add, int, "addl %1,%0", "ir", v); 284 ATOMIC_ASM(subtract, int, "subl %1,%0", "ir", v); 285 286 ATOMIC_ASM(set, long, "orq %1,%0", "ir", v); 287 ATOMIC_ASM(clear, long, "andq %1,%0", "ir", ~v); 288 ATOMIC_ASM(add, long, "addq %1,%0", "ir", v); 289 ATOMIC_ASM(subtract, long, "subq %1,%0", "ir", v); 290 291 ATOMIC_STORE_LOAD(char, "cmpxchgb %b0,%1", "xchgb %b1,%0"); 292 ATOMIC_STORE_LOAD(short,"cmpxchgw %w0,%1", "xchgw %w1,%0"); 293 ATOMIC_STORE_LOAD(int, "cmpxchgl %0,%1", "xchgl %1,%0"); 294 ATOMIC_STORE_LOAD(long, "cmpxchgq %0,%1", "xchgq %1,%0"); 295 296 #undef ATOMIC_ASM 297 #undef ATOMIC_STORE_LOAD 298 299 #ifndef WANT_FUNCTIONS 300 301 /* Read the current value and store a zero in the destination. */ 302 #ifdef __GNUCLIKE_ASM 303 304 static __inline u_int 305 atomic_readandclear_int(volatile u_int *addr) 306 { 307 u_int res; 308 309 res = 0; 310 __asm __volatile( 311 " xchgl %1,%0 ; " 312 "# atomic_readandclear_int" 313 : "+r" (res), /* 0 */ 314 "=m" (*addr) /* 1 */ 315 : "m" (*addr)); 316 317 return (res); 318 } 319 320 static __inline u_long 321 atomic_readandclear_long(volatile u_long *addr) 322 { 323 u_long res; 324 325 res = 0; 326 __asm __volatile( 327 " xchgq %1,%0 ; " 328 "# atomic_readandclear_long" 329 : "+r" (res), /* 0 */ 330 "=m" (*addr) /* 1 */ 331 : "m" (*addr)); 332 333 return (res); 334 } 335 336 #else /* !__GNUCLIKE_ASM */ 337 338 u_int atomic_readandclear_int(volatile u_int *addr); 339 u_long atomic_readandclear_long(volatile u_long *addr); 340 341 #endif /* __GNUCLIKE_ASM */ 342 343 #define atomic_set_acq_char atomic_set_barr_char 344 #define atomic_set_rel_char atomic_set_barr_char 345 #define atomic_clear_acq_char atomic_clear_barr_char 346 #define atomic_clear_rel_char atomic_clear_barr_char 347 #define atomic_add_acq_char atomic_add_barr_char 348 #define atomic_add_rel_char atomic_add_barr_char 349 #define atomic_subtract_acq_char atomic_subtract_barr_char 350 #define atomic_subtract_rel_char atomic_subtract_barr_char 351 352 #define atomic_set_acq_short atomic_set_barr_short 353 #define atomic_set_rel_short atomic_set_barr_short 354 #define atomic_clear_acq_short atomic_clear_barr_short 355 #define atomic_clear_rel_short atomic_clear_barr_short 356 #define atomic_add_acq_short atomic_add_barr_short 357 #define atomic_add_rel_short atomic_add_barr_short 358 #define atomic_subtract_acq_short atomic_subtract_barr_short 359 #define atomic_subtract_rel_short atomic_subtract_barr_short 360 361 #define atomic_set_acq_int atomic_set_barr_int 362 #define atomic_set_rel_int atomic_set_barr_int 363 #define atomic_clear_acq_int atomic_clear_barr_int 364 #define atomic_clear_rel_int atomic_clear_barr_int 365 #define atomic_add_acq_int atomic_add_barr_int 366 #define atomic_add_rel_int atomic_add_barr_int 367 #define atomic_subtract_acq_int atomic_subtract_barr_int 368 #define atomic_subtract_rel_int atomic_subtract_barr_int 369 #define atomic_cmpset_acq_int atomic_cmpset_int 370 #define atomic_cmpset_rel_int atomic_cmpset_int 371 372 #define atomic_set_acq_long atomic_set_barr_long 373 #define atomic_set_rel_long atomic_set_barr_long 374 #define atomic_clear_acq_long atomic_clear_barr_long 375 #define atomic_clear_rel_long atomic_clear_barr_long 376 #define atomic_add_acq_long atomic_add_barr_long 377 #define atomic_add_rel_long atomic_add_barr_long 378 #define atomic_subtract_acq_long atomic_subtract_barr_long 379 #define atomic_subtract_rel_long atomic_subtract_barr_long 380 #define atomic_cmpset_acq_long atomic_cmpset_long 381 #define atomic_cmpset_rel_long atomic_cmpset_long 382 383 /* Operations on 8-bit bytes. */ 384 #define atomic_set_8 atomic_set_char 385 #define atomic_set_acq_8 atomic_set_acq_char 386 #define atomic_set_rel_8 atomic_set_rel_char 387 #define atomic_clear_8 atomic_clear_char 388 #define atomic_clear_acq_8 atomic_clear_acq_char 389 #define atomic_clear_rel_8 atomic_clear_rel_char 390 #define atomic_add_8 atomic_add_char 391 #define atomic_add_acq_8 atomic_add_acq_char 392 #define atomic_add_rel_8 atomic_add_rel_char 393 #define atomic_subtract_8 atomic_subtract_char 394 #define atomic_subtract_acq_8 atomic_subtract_acq_char 395 #define atomic_subtract_rel_8 atomic_subtract_rel_char 396 #define atomic_load_acq_8 atomic_load_acq_char 397 #define atomic_store_rel_8 atomic_store_rel_char 398 399 /* Operations on 16-bit words. */ 400 #define atomic_set_16 atomic_set_short 401 #define atomic_set_acq_16 atomic_set_acq_short 402 #define atomic_set_rel_16 atomic_set_rel_short 403 #define atomic_clear_16 atomic_clear_short 404 #define atomic_clear_acq_16 atomic_clear_acq_short 405 #define atomic_clear_rel_16 atomic_clear_rel_short 406 #define atomic_add_16 atomic_add_short 407 #define atomic_add_acq_16 atomic_add_acq_short 408 #define atomic_add_rel_16 atomic_add_rel_short 409 #define atomic_subtract_16 atomic_subtract_short 410 #define atomic_subtract_acq_16 atomic_subtract_acq_short 411 #define atomic_subtract_rel_16 atomic_subtract_rel_short 412 #define atomic_load_acq_16 atomic_load_acq_short 413 #define atomic_store_rel_16 atomic_store_rel_short 414 415 /* Operations on 32-bit double words. */ 416 #define atomic_set_32 atomic_set_int 417 #define atomic_set_acq_32 atomic_set_acq_int 418 #define atomic_set_rel_32 atomic_set_rel_int 419 #define atomic_clear_32 atomic_clear_int 420 #define atomic_clear_acq_32 atomic_clear_acq_int 421 #define atomic_clear_rel_32 atomic_clear_rel_int 422 #define atomic_add_32 atomic_add_int 423 #define atomic_add_acq_32 atomic_add_acq_int 424 #define atomic_add_rel_32 atomic_add_rel_int 425 #define atomic_subtract_32 atomic_subtract_int 426 #define atomic_subtract_acq_32 atomic_subtract_acq_int 427 #define atomic_subtract_rel_32 atomic_subtract_rel_int 428 #define atomic_load_acq_32 atomic_load_acq_int 429 #define atomic_store_rel_32 atomic_store_rel_int 430 #define atomic_cmpset_32 atomic_cmpset_int 431 #define atomic_cmpset_acq_32 atomic_cmpset_acq_int 432 #define atomic_cmpset_rel_32 atomic_cmpset_rel_int 433 #define atomic_readandclear_32 atomic_readandclear_int 434 #define atomic_fetchadd_32 atomic_fetchadd_int 435 436 /* Operations on 64-bit quad words. */ 437 #define atomic_set_64 atomic_set_long 438 #define atomic_set_acq_64 atomic_set_acq_long 439 #define atomic_set_rel_64 atomic_set_rel_long 440 #define atomic_clear_64 atomic_clear_long 441 #define atomic_clear_acq_64 atomic_clear_acq_long 442 #define atomic_clear_rel_64 atomic_clear_rel_long 443 #define atomic_add_64 atomic_add_long 444 #define atomic_add_acq_64 atomic_add_acq_long 445 #define atomic_add_rel_64 atomic_add_rel_long 446 #define atomic_subtract_64 atomic_subtract_long 447 #define atomic_subtract_acq_64 atomic_subtract_acq_long 448 #define atomic_subtract_rel_64 atomic_subtract_rel_long 449 #define atomic_load_acq_64 atomic_load_acq_long 450 #define atomic_store_rel_64 atomic_store_rel_long 451 #define atomic_cmpset_64 atomic_cmpset_long 452 #define atomic_cmpset_acq_64 atomic_cmpset_acq_long 453 #define atomic_cmpset_rel_64 atomic_cmpset_rel_long 454 #define atomic_readandclear_64 atomic_readandclear_long 455 456 /* Operations on pointers. */ 457 #define atomic_set_ptr atomic_set_long 458 #define atomic_set_acq_ptr atomic_set_acq_long 459 #define atomic_set_rel_ptr atomic_set_rel_long 460 #define atomic_clear_ptr atomic_clear_long 461 #define atomic_clear_acq_ptr atomic_clear_acq_long 462 #define atomic_clear_rel_ptr atomic_clear_rel_long 463 #define atomic_add_ptr atomic_add_long 464 #define atomic_add_acq_ptr atomic_add_acq_long 465 #define atomic_add_rel_ptr atomic_add_rel_long 466 #define atomic_subtract_ptr atomic_subtract_long 467 #define atomic_subtract_acq_ptr atomic_subtract_acq_long 468 #define atomic_subtract_rel_ptr atomic_subtract_rel_long 469 #define atomic_load_acq_ptr atomic_load_acq_long 470 #define atomic_store_rel_ptr atomic_store_rel_long 471 #define atomic_cmpset_ptr atomic_cmpset_long 472 #define atomic_cmpset_acq_ptr atomic_cmpset_acq_long 473 #define atomic_cmpset_rel_ptr atomic_cmpset_rel_long 474 #define atomic_readandclear_ptr atomic_readandclear_long 475 476 #endif /* !WANT_FUNCTIONS */ 477 478 #endif /* !_MACHINE_ATOMIC_H_ */
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