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 * $FreeBSD$ 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 #define mb() __asm __volatile("lock; addl $0,(%%esp)" : : : "memory") 36 #define wmb() __asm __volatile("lock; addl $0,(%%esp)" : : : "memory") 37 #define rmb() __asm __volatile("lock; addl $0,(%%esp)" : : : "memory") 38 39 /* 40 * Various simple operations on memory, each of which is atomic in the 41 * presence of interrupts and multiple processors. 42 * 43 * atomic_set_char(P, V) (*(u_char *)(P) |= (V)) 44 * atomic_clear_char(P, V) (*(u_char *)(P) &= ~(V)) 45 * atomic_add_char(P, V) (*(u_char *)(P) += (V)) 46 * atomic_subtract_char(P, V) (*(u_char *)(P) -= (V)) 47 * 48 * atomic_set_short(P, V) (*(u_short *)(P) |= (V)) 49 * atomic_clear_short(P, V) (*(u_short *)(P) &= ~(V)) 50 * atomic_add_short(P, V) (*(u_short *)(P) += (V)) 51 * atomic_subtract_short(P, V) (*(u_short *)(P) -= (V)) 52 * 53 * atomic_set_int(P, V) (*(u_int *)(P) |= (V)) 54 * atomic_clear_int(P, V) (*(u_int *)(P) &= ~(V)) 55 * atomic_add_int(P, V) (*(u_int *)(P) += (V)) 56 * atomic_subtract_int(P, V) (*(u_int *)(P) -= (V)) 57 * atomic_readandclear_int(P) (return (*(u_int *)(P)); *(u_int *)(P) = 0;) 58 * 59 * atomic_set_long(P, V) (*(u_long *)(P) |= (V)) 60 * atomic_clear_long(P, V) (*(u_long *)(P) &= ~(V)) 61 * atomic_add_long(P, V) (*(u_long *)(P) += (V)) 62 * atomic_subtract_long(P, V) (*(u_long *)(P) -= (V)) 63 * atomic_readandclear_long(P) (return (*(u_long *)(P)); *(u_long *)(P) = 0;) 64 */ 65 66 /* 67 * The above functions are expanded inline in the statically-linked 68 * kernel. Lock prefixes are generated if an SMP kernel is being 69 * built. 70 * 71 * Kernel modules call real functions which are built into the kernel. 72 * This allows kernel modules to be portable between UP and SMP systems. 73 */ 74 #if defined(KLD_MODULE) || !defined(__GNUCLIKE_ASM) 75 #define ATOMIC_ASM(NAME, TYPE, OP, CONS, V) \ 76 void atomic_##NAME##_##TYPE(volatile u_##TYPE *p, u_##TYPE v); \ 77 void atomic_##NAME##_barr_##TYPE(volatile u_##TYPE *p, u_##TYPE v) 78 79 int atomic_cmpset_int(volatile u_int *dst, u_int expect, u_int src); 80 u_int atomic_fetchadd_int(volatile u_int *p, u_int v); 81 82 #define ATOMIC_STORE_LOAD(TYPE, LOP, SOP) \ 83 u_##TYPE atomic_load_acq_##TYPE(volatile u_##TYPE *p); \ 84 void atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v) 85 86 #else /* !KLD_MODULE && __GNUCLIKE_ASM */ 87 88 /* 89 * For userland, always use lock prefixes so that the binaries will run 90 * on both SMP and !SMP systems. 91 */ 92 #if defined(SMP) || !defined(_KERNEL) 93 #define MPLOCKED "lock ; " 94 #else 95 #define MPLOCKED 96 #endif 97 98 /* 99 * The assembly is volatilized to avoid code chunk removal by the compiler. 100 * GCC aggressively reorders operations and memory clobbering is necessary 101 * in order to avoid that for memory barriers. 102 */ 103 #define ATOMIC_ASM(NAME, TYPE, OP, CONS, V) \ 104 static __inline void \ 105 atomic_##NAME##_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\ 106 { \ 107 __asm __volatile(MPLOCKED OP \ 108 : "=m" (*p) \ 109 : CONS (V), "m" (*p) \ 110 : "cc"); \ 111 } \ 112 \ 113 static __inline void \ 114 atomic_##NAME##_barr_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\ 115 { \ 116 __asm __volatile(MPLOCKED OP \ 117 : "=m" (*p) \ 118 : CONS (V), "m" (*p) \ 119 : "memory", "cc"); \ 120 } \ 121 struct __hack 122 123 #if defined(_KERNEL) && !defined(WANT_FUNCTIONS) 124 125 /* I486 does not support SMP or CMPXCHG8B. */ 126 static __inline uint64_t 127 atomic_load_acq_64_i386(volatile uint64_t *p) 128 { 129 volatile uint32_t *high, *low; 130 uint64_t res; 131 132 low = (volatile uint32_t *)p; 133 high = (volatile uint32_t *)p + 1; 134 __asm __volatile( 135 " pushfl ; " 136 " cli ; " 137 " movl %1,%%eax ; " 138 " movl %2,%%edx ; " 139 " popfl" 140 : "=&A" (res) /* 0 */ 141 : "m" (*low), /* 1 */ 142 "m" (*high) /* 2 */ 143 : "memory"); 144 145 return (res); 146 } 147 148 static __inline void 149 atomic_store_rel_64_i386(volatile uint64_t *p, uint64_t v) 150 { 151 volatile uint32_t *high, *low; 152 153 low = (volatile uint32_t *)p; 154 high = (volatile uint32_t *)p + 1; 155 __asm __volatile( 156 " pushfl ; " 157 " cli ; " 158 " movl %%eax,%0 ; " 159 " movl %%edx,%1 ; " 160 " popfl" 161 : "=m" (*low), /* 0 */ 162 "=m" (*high) /* 1 */ 163 : "A" (v) /* 2 */ 164 : "memory"); 165 } 166 167 static __inline uint64_t 168 atomic_load_acq_64_i586(volatile uint64_t *p) 169 { 170 uint64_t res; 171 172 __asm __volatile( 173 " movl %%ebx,%%eax ; " 174 " movl %%ecx,%%edx ; " 175 " " MPLOCKED " " 176 " cmpxchg8b %2" 177 : "=&A" (res), /* 0 */ 178 "=m" (*p) /* 1 */ 179 : "m" (*p) /* 2 */ 180 : "memory", "cc"); 181 182 return (res); 183 } 184 185 static __inline void 186 atomic_store_rel_64_i586(volatile uint64_t *p, uint64_t v) 187 { 188 189 __asm __volatile( 190 " movl %%eax,%%ebx ; " 191 " movl %%edx,%%ecx ; " 192 "1: " 193 " " MPLOCKED " " 194 " cmpxchg8b %2 ; " 195 " jne 1b" 196 : "=m" (*p), /* 0 */ 197 "+A" (v) /* 1 */ 198 : "m" (*p) /* 2 */ 199 : "ebx", "ecx", "memory", "cc"); 200 } 201 202 #endif /* _KERNEL && !WANT_FUNCTIONS */ 203 204 /* 205 * Atomic compare and set, used by the mutex functions 206 * 207 * if (*dst == expect) *dst = src (all 32 bit words) 208 * 209 * Returns 0 on failure, non-zero on success 210 */ 211 212 #ifdef CPU_DISABLE_CMPXCHG 213 214 static __inline int 215 atomic_cmpset_int(volatile u_int *dst, u_int expect, u_int src) 216 { 217 u_char res; 218 219 __asm __volatile( 220 " pushfl ; " 221 " cli ; " 222 " cmpl %3,%4 ; " 223 " jne 1f ; " 224 " movl %2,%1 ; " 225 "1: " 226 " sete %0 ; " 227 " popfl ; " 228 "# atomic_cmpset_int" 229 : "=q" (res), /* 0 */ 230 "=m" (*dst) /* 1 */ 231 : "r" (src), /* 2 */ 232 "r" (expect), /* 3 */ 233 "m" (*dst) /* 4 */ 234 : "memory"); 235 236 return (res); 237 } 238 239 #else /* !CPU_DISABLE_CMPXCHG */ 240 241 static __inline int 242 atomic_cmpset_int(volatile u_int *dst, u_int expect, u_int src) 243 { 244 u_char res; 245 246 __asm __volatile( 247 " " MPLOCKED " " 248 " cmpxchgl %2,%1 ; " 249 " sete %0 ; " 250 "1: " 251 "# atomic_cmpset_int" 252 : "=a" (res), /* 0 */ 253 "=m" (*dst) /* 1 */ 254 : "r" (src), /* 2 */ 255 "a" (expect), /* 3 */ 256 "m" (*dst) /* 4 */ 257 : "memory", "cc"); 258 259 return (res); 260 } 261 262 #endif /* CPU_DISABLE_CMPXCHG */ 263 264 /* 265 * Atomically add the value of v to the integer pointed to by p and return 266 * the previous value of *p. 267 */ 268 static __inline u_int 269 atomic_fetchadd_int(volatile u_int *p, u_int v) 270 { 271 272 __asm __volatile( 273 " " MPLOCKED " " 274 " xaddl %0, %1 ; " 275 "# atomic_fetchadd_int" 276 : "+r" (v), /* 0 (result) */ 277 "=m" (*p) /* 1 */ 278 : "m" (*p) /* 2 */ 279 : "cc"); 280 return (v); 281 } 282 283 #if defined(_KERNEL) && !defined(SMP) 284 285 /* 286 * We assume that a = b will do atomic loads and stores. However, on a 287 * PentiumPro or higher, reads may pass writes, so for that case we have 288 * to use a serializing instruction (i.e. with LOCK) to do the load in 289 * SMP kernels. For UP kernels, however, the cache of the single processor 290 * is always consistent, so we only need to take care of compiler. 291 */ 292 #define ATOMIC_STORE_LOAD(TYPE, LOP, SOP) \ 293 static __inline u_##TYPE \ 294 atomic_load_acq_##TYPE(volatile u_##TYPE *p) \ 295 { \ 296 u_##TYPE tmp; \ 297 \ 298 tmp = *p; \ 299 __asm __volatile("" : : : "memory"); \ 300 return (tmp); \ 301 } \ 302 \ 303 static __inline void \ 304 atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\ 305 { \ 306 __asm __volatile("" : : : "memory"); \ 307 *p = v; \ 308 } \ 309 struct __hack 310 311 #else /* !(_KERNEL && !SMP) */ 312 313 #define ATOMIC_STORE_LOAD(TYPE, LOP, SOP) \ 314 static __inline u_##TYPE \ 315 atomic_load_acq_##TYPE(volatile u_##TYPE *p) \ 316 { \ 317 u_##TYPE res; \ 318 \ 319 __asm __volatile(MPLOCKED LOP \ 320 : "=a" (res), /* 0 */ \ 321 "=m" (*p) /* 1 */ \ 322 : "m" (*p) /* 2 */ \ 323 : "memory", "cc"); \ 324 \ 325 return (res); \ 326 } \ 327 \ 328 /* \ 329 * The XCHG instruction asserts LOCK automagically. \ 330 */ \ 331 static __inline void \ 332 atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\ 333 { \ 334 __asm __volatile(SOP \ 335 : "=m" (*p), /* 0 */ \ 336 "+r" (v) /* 1 */ \ 337 : "m" (*p) /* 2 */ \ 338 : "memory"); \ 339 } \ 340 struct __hack 341 342 #endif /* _KERNEL && !SMP */ 343 344 #endif /* KLD_MODULE || !__GNUCLIKE_ASM */ 345 346 ATOMIC_ASM(set, char, "orb %b1,%0", "iq", v); 347 ATOMIC_ASM(clear, char, "andb %b1,%0", "iq", ~v); 348 ATOMIC_ASM(add, char, "addb %b1,%0", "iq", v); 349 ATOMIC_ASM(subtract, char, "subb %b1,%0", "iq", v); 350 351 ATOMIC_ASM(set, short, "orw %w1,%0", "ir", v); 352 ATOMIC_ASM(clear, short, "andw %w1,%0", "ir", ~v); 353 ATOMIC_ASM(add, short, "addw %w1,%0", "ir", v); 354 ATOMIC_ASM(subtract, short, "subw %w1,%0", "ir", v); 355 356 ATOMIC_ASM(set, int, "orl %1,%0", "ir", v); 357 ATOMIC_ASM(clear, int, "andl %1,%0", "ir", ~v); 358 ATOMIC_ASM(add, int, "addl %1,%0", "ir", v); 359 ATOMIC_ASM(subtract, int, "subl %1,%0", "ir", v); 360 361 ATOMIC_ASM(set, long, "orl %1,%0", "ir", v); 362 ATOMIC_ASM(clear, long, "andl %1,%0", "ir", ~v); 363 ATOMIC_ASM(add, long, "addl %1,%0", "ir", v); 364 ATOMIC_ASM(subtract, long, "subl %1,%0", "ir", v); 365 366 ATOMIC_STORE_LOAD(char, "cmpxchgb %b0,%1", "xchgb %b1,%0"); 367 ATOMIC_STORE_LOAD(short,"cmpxchgw %w0,%1", "xchgw %w1,%0"); 368 ATOMIC_STORE_LOAD(int, "cmpxchgl %0,%1", "xchgl %1,%0"); 369 ATOMIC_STORE_LOAD(long, "cmpxchgl %0,%1", "xchgl %1,%0"); 370 371 #undef ATOMIC_ASM 372 #undef ATOMIC_STORE_LOAD 373 374 #ifndef WANT_FUNCTIONS 375 376 #ifdef _KERNEL 377 extern uint64_t (*atomic_load_acq_64)(volatile uint64_t *); 378 extern void (*atomic_store_rel_64)(volatile uint64_t *, uint64_t); 379 #endif 380 381 static __inline int 382 atomic_cmpset_long(volatile u_long *dst, u_long expect, u_long src) 383 { 384 385 return (atomic_cmpset_int((volatile u_int *)dst, (u_int)expect, 386 (u_int)src)); 387 } 388 389 static __inline u_long 390 atomic_fetchadd_long(volatile u_long *p, u_long v) 391 { 392 393 return (atomic_fetchadd_int((volatile u_int *)p, (u_int)v)); 394 } 395 396 /* Read the current value and store a zero in the destination. */ 397 #ifdef __GNUCLIKE_ASM 398 399 static __inline u_int 400 atomic_readandclear_int(volatile u_int *addr) 401 { 402 u_int res; 403 404 res = 0; 405 __asm __volatile( 406 " xchgl %1,%0 ; " 407 "# atomic_readandclear_int" 408 : "+r" (res), /* 0 */ 409 "=m" (*addr) /* 1 */ 410 : "m" (*addr)); 411 412 return (res); 413 } 414 415 static __inline u_long 416 atomic_readandclear_long(volatile u_long *addr) 417 { 418 u_long res; 419 420 res = 0; 421 __asm __volatile( 422 " xchgl %1,%0 ; " 423 "# atomic_readandclear_long" 424 : "+r" (res), /* 0 */ 425 "=m" (*addr) /* 1 */ 426 : "m" (*addr)); 427 428 return (res); 429 } 430 431 #else /* !__GNUCLIKE_ASM */ 432 433 u_int atomic_readandclear_int(volatile u_int *addr); 434 u_long atomic_readandclear_long(volatile u_long *addr); 435 436 #endif /* __GNUCLIKE_ASM */ 437 438 #define atomic_set_acq_char atomic_set_barr_char 439 #define atomic_set_rel_char atomic_set_barr_char 440 #define atomic_clear_acq_char atomic_clear_barr_char 441 #define atomic_clear_rel_char atomic_clear_barr_char 442 #define atomic_add_acq_char atomic_add_barr_char 443 #define atomic_add_rel_char atomic_add_barr_char 444 #define atomic_subtract_acq_char atomic_subtract_barr_char 445 #define atomic_subtract_rel_char atomic_subtract_barr_char 446 447 #define atomic_set_acq_short atomic_set_barr_short 448 #define atomic_set_rel_short atomic_set_barr_short 449 #define atomic_clear_acq_short atomic_clear_barr_short 450 #define atomic_clear_rel_short atomic_clear_barr_short 451 #define atomic_add_acq_short atomic_add_barr_short 452 #define atomic_add_rel_short atomic_add_barr_short 453 #define atomic_subtract_acq_short atomic_subtract_barr_short 454 #define atomic_subtract_rel_short atomic_subtract_barr_short 455 456 #define atomic_set_acq_int atomic_set_barr_int 457 #define atomic_set_rel_int atomic_set_barr_int 458 #define atomic_clear_acq_int atomic_clear_barr_int 459 #define atomic_clear_rel_int atomic_clear_barr_int 460 #define atomic_add_acq_int atomic_add_barr_int 461 #define atomic_add_rel_int atomic_add_barr_int 462 #define atomic_subtract_acq_int atomic_subtract_barr_int 463 #define atomic_subtract_rel_int atomic_subtract_barr_int 464 #define atomic_cmpset_acq_int atomic_cmpset_int 465 #define atomic_cmpset_rel_int atomic_cmpset_int 466 467 #define atomic_set_acq_long atomic_set_barr_long 468 #define atomic_set_rel_long atomic_set_barr_long 469 #define atomic_clear_acq_long atomic_clear_barr_long 470 #define atomic_clear_rel_long atomic_clear_barr_long 471 #define atomic_add_acq_long atomic_add_barr_long 472 #define atomic_add_rel_long atomic_add_barr_long 473 #define atomic_subtract_acq_long atomic_subtract_barr_long 474 #define atomic_subtract_rel_long atomic_subtract_barr_long 475 #define atomic_cmpset_acq_long atomic_cmpset_long 476 #define atomic_cmpset_rel_long atomic_cmpset_long 477 478 /* Operations on 8-bit bytes. */ 479 #define atomic_set_8 atomic_set_char 480 #define atomic_set_acq_8 atomic_set_acq_char 481 #define atomic_set_rel_8 atomic_set_rel_char 482 #define atomic_clear_8 atomic_clear_char 483 #define atomic_clear_acq_8 atomic_clear_acq_char 484 #define atomic_clear_rel_8 atomic_clear_rel_char 485 #define atomic_add_8 atomic_add_char 486 #define atomic_add_acq_8 atomic_add_acq_char 487 #define atomic_add_rel_8 atomic_add_rel_char 488 #define atomic_subtract_8 atomic_subtract_char 489 #define atomic_subtract_acq_8 atomic_subtract_acq_char 490 #define atomic_subtract_rel_8 atomic_subtract_rel_char 491 #define atomic_load_acq_8 atomic_load_acq_char 492 #define atomic_store_rel_8 atomic_store_rel_char 493 494 /* Operations on 16-bit words. */ 495 #define atomic_set_16 atomic_set_short 496 #define atomic_set_acq_16 atomic_set_acq_short 497 #define atomic_set_rel_16 atomic_set_rel_short 498 #define atomic_clear_16 atomic_clear_short 499 #define atomic_clear_acq_16 atomic_clear_acq_short 500 #define atomic_clear_rel_16 atomic_clear_rel_short 501 #define atomic_add_16 atomic_add_short 502 #define atomic_add_acq_16 atomic_add_acq_short 503 #define atomic_add_rel_16 atomic_add_rel_short 504 #define atomic_subtract_16 atomic_subtract_short 505 #define atomic_subtract_acq_16 atomic_subtract_acq_short 506 #define atomic_subtract_rel_16 atomic_subtract_rel_short 507 #define atomic_load_acq_16 atomic_load_acq_short 508 #define atomic_store_rel_16 atomic_store_rel_short 509 510 /* Operations on 32-bit double words. */ 511 #define atomic_set_32 atomic_set_int 512 #define atomic_set_acq_32 atomic_set_acq_int 513 #define atomic_set_rel_32 atomic_set_rel_int 514 #define atomic_clear_32 atomic_clear_int 515 #define atomic_clear_acq_32 atomic_clear_acq_int 516 #define atomic_clear_rel_32 atomic_clear_rel_int 517 #define atomic_add_32 atomic_add_int 518 #define atomic_add_acq_32 atomic_add_acq_int 519 #define atomic_add_rel_32 atomic_add_rel_int 520 #define atomic_subtract_32 atomic_subtract_int 521 #define atomic_subtract_acq_32 atomic_subtract_acq_int 522 #define atomic_subtract_rel_32 atomic_subtract_rel_int 523 #define atomic_load_acq_32 atomic_load_acq_int 524 #define atomic_store_rel_32 atomic_store_rel_int 525 #define atomic_cmpset_32 atomic_cmpset_int 526 #define atomic_cmpset_acq_32 atomic_cmpset_acq_int 527 #define atomic_cmpset_rel_32 atomic_cmpset_rel_int 528 #define atomic_readandclear_32 atomic_readandclear_int 529 #define atomic_fetchadd_32 atomic_fetchadd_int 530 531 /* Operations on pointers. */ 532 #define atomic_set_ptr(p, v) \ 533 atomic_set_int((volatile u_int *)(p), (u_int)(v)) 534 #define atomic_set_acq_ptr(p, v) \ 535 atomic_set_acq_int((volatile u_int *)(p), (u_int)(v)) 536 #define atomic_set_rel_ptr(p, v) \ 537 atomic_set_rel_int((volatile u_int *)(p), (u_int)(v)) 538 #define atomic_clear_ptr(p, v) \ 539 atomic_clear_int((volatile u_int *)(p), (u_int)(v)) 540 #define atomic_clear_acq_ptr(p, v) \ 541 atomic_clear_acq_int((volatile u_int *)(p), (u_int)(v)) 542 #define atomic_clear_rel_ptr(p, v) \ 543 atomic_clear_rel_int((volatile u_int *)(p), (u_int)(v)) 544 #define atomic_add_ptr(p, v) \ 545 atomic_add_int((volatile u_int *)(p), (u_int)(v)) 546 #define atomic_add_acq_ptr(p, v) \ 547 atomic_add_acq_int((volatile u_int *)(p), (u_int)(v)) 548 #define atomic_add_rel_ptr(p, v) \ 549 atomic_add_rel_int((volatile u_int *)(p), (u_int)(v)) 550 #define atomic_subtract_ptr(p, v) \ 551 atomic_subtract_int((volatile u_int *)(p), (u_int)(v)) 552 #define atomic_subtract_acq_ptr(p, v) \ 553 atomic_subtract_acq_int((volatile u_int *)(p), (u_int)(v)) 554 #define atomic_subtract_rel_ptr(p, v) \ 555 atomic_subtract_rel_int((volatile u_int *)(p), (u_int)(v)) 556 #define atomic_load_acq_ptr(p) \ 557 atomic_load_acq_int((volatile u_int *)(p)) 558 #define atomic_store_rel_ptr(p, v) \ 559 atomic_store_rel_int((volatile u_int *)(p), (v)) 560 #define atomic_cmpset_ptr(dst, old, new) \ 561 atomic_cmpset_int((volatile u_int *)(dst), (u_int)(old), (u_int)(new)) 562 #define atomic_cmpset_acq_ptr(dst, old, new) \ 563 atomic_cmpset_acq_int((volatile u_int *)(dst), (u_int)(old), \ 564 (u_int)(new)) 565 #define atomic_cmpset_rel_ptr(dst, old, new) \ 566 atomic_cmpset_rel_int((volatile u_int *)(dst), (u_int)(old), \ 567 (u_int)(new)) 568 #define atomic_readandclear_ptr(p) \ 569 atomic_readandclear_int((volatile u_int *)(p)) 570 571 #endif /* !WANT_FUNCTIONS */ 572 573 #endif /* !_MACHINE_ATOMIC_H_ */ 574