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/9.1/sys/i386/include/atomic.h 237161 2012-06-16 13:22:55Z kib $
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", "cc")
36 #define wmb() __asm __volatile("lock; addl $0,(%%esp)" : : : "memory", "cc")
37 #define rmb() __asm __volatile("lock; addl $0,(%%esp)" : : : "memory", "cc")
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_LOAD(TYPE, LOP) \
83 u_##TYPE atomic_load_acq_##TYPE(volatile u_##TYPE *p)
84 #define ATOMIC_STORE(TYPE) \
85 void atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v)
86
87 #else /* !KLD_MODULE && __GNUCLIKE_ASM */
88
89 /*
90 * For userland, always use lock prefixes so that the binaries will run
91 * on both SMP and !SMP systems.
92 */
93 #if defined(SMP) || !defined(_KERNEL)
94 #define MPLOCKED "lock ; "
95 #else
96 #define MPLOCKED
97 #endif
98
99 /*
100 * The assembly is volatilized to avoid code chunk removal by the compiler.
101 * GCC aggressively reorders operations and memory clobbering is necessary
102 * in order to avoid that for memory barriers.
103 */
104 #define ATOMIC_ASM(NAME, TYPE, OP, CONS, V) \
105 static __inline void \
106 atomic_##NAME##_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\
107 { \
108 __asm __volatile(MPLOCKED OP \
109 : "=m" (*p) \
110 : CONS (V), "m" (*p) \
111 : "cc"); \
112 } \
113 \
114 static __inline void \
115 atomic_##NAME##_barr_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\
116 { \
117 __asm __volatile(MPLOCKED OP \
118 : "=m" (*p) \
119 : CONS (V), "m" (*p) \
120 : "memory", "cc"); \
121 } \
122 struct __hack
123
124 #if defined(_KERNEL) && !defined(WANT_FUNCTIONS)
125
126 /* I486 does not support SMP or CMPXCHG8B. */
127 static __inline uint64_t
128 atomic_load_acq_64_i386(volatile uint64_t *p)
129 {
130 volatile uint32_t *high, *low;
131 uint64_t res;
132
133 low = (volatile uint32_t *)p;
134 high = (volatile uint32_t *)p + 1;
135 __asm __volatile(
136 " pushfl ; "
137 " cli ; "
138 " movl %1,%%eax ; "
139 " movl %2,%%edx ; "
140 " popfl"
141 : "=&A" (res) /* 0 */
142 : "m" (*low), /* 1 */
143 "m" (*high) /* 2 */
144 : "memory");
145
146 return (res);
147 }
148
149 static __inline void
150 atomic_store_rel_64_i386(volatile uint64_t *p, uint64_t v)
151 {
152 volatile uint32_t *high, *low;
153
154 low = (volatile uint32_t *)p;
155 high = (volatile uint32_t *)p + 1;
156 __asm __volatile(
157 " pushfl ; "
158 " cli ; "
159 " movl %%eax,%0 ; "
160 " movl %%edx,%1 ; "
161 " popfl"
162 : "=m" (*low), /* 0 */
163 "=m" (*high) /* 1 */
164 : "A" (v) /* 2 */
165 : "memory");
166 }
167
168 static __inline uint64_t
169 atomic_load_acq_64_i586(volatile uint64_t *p)
170 {
171 uint64_t res;
172
173 __asm __volatile(
174 " movl %%ebx,%%eax ; "
175 " movl %%ecx,%%edx ; "
176 " " MPLOCKED " "
177 " cmpxchg8b %2"
178 : "=&A" (res), /* 0 */
179 "=m" (*p) /* 1 */
180 : "m" (*p) /* 2 */
181 : "memory", "cc");
182
183 return (res);
184 }
185
186 static __inline void
187 atomic_store_rel_64_i586(volatile uint64_t *p, uint64_t v)
188 {
189
190 __asm __volatile(
191 " movl %%eax,%%ebx ; "
192 " movl %%edx,%%ecx ; "
193 "1: "
194 " " MPLOCKED " "
195 " cmpxchg8b %2 ; "
196 " jne 1b"
197 : "=m" (*p), /* 0 */
198 "+A" (v) /* 1 */
199 : "m" (*p) /* 2 */
200 : "ebx", "ecx", "memory", "cc");
201 }
202
203 #endif /* _KERNEL && !WANT_FUNCTIONS */
204
205 /*
206 * Atomic compare and set, used by the mutex functions
207 *
208 * if (*dst == expect) *dst = src (all 32 bit words)
209 *
210 * Returns 0 on failure, non-zero on success
211 */
212
213 #ifdef CPU_DISABLE_CMPXCHG
214
215 static __inline int
216 atomic_cmpset_int(volatile u_int *dst, u_int expect, u_int src)
217 {
218 u_char res;
219
220 __asm __volatile(
221 " pushfl ; "
222 " cli ; "
223 " cmpl %3,%4 ; "
224 " jne 1f ; "
225 " movl %2,%1 ; "
226 "1: "
227 " sete %0 ; "
228 " popfl ; "
229 "# atomic_cmpset_int"
230 : "=q" (res), /* 0 */
231 "=m" (*dst) /* 1 */
232 : "r" (src), /* 2 */
233 "r" (expect), /* 3 */
234 "m" (*dst) /* 4 */
235 : "memory");
236
237 return (res);
238 }
239
240 #else /* !CPU_DISABLE_CMPXCHG */
241
242 static __inline int
243 atomic_cmpset_int(volatile u_int *dst, u_int expect, u_int src)
244 {
245 u_char res;
246
247 __asm __volatile(
248 " " MPLOCKED " "
249 " cmpxchgl %2,%1 ; "
250 " sete %0 ; "
251 "1: "
252 "# atomic_cmpset_int"
253 : "=a" (res), /* 0 */
254 "=m" (*dst) /* 1 */
255 : "r" (src), /* 2 */
256 "a" (expect), /* 3 */
257 "m" (*dst) /* 4 */
258 : "memory", "cc");
259
260 return (res);
261 }
262
263 #endif /* CPU_DISABLE_CMPXCHG */
264
265 /*
266 * Atomically add the value of v to the integer pointed to by p and return
267 * the previous value of *p.
268 */
269 static __inline u_int
270 atomic_fetchadd_int(volatile u_int *p, u_int v)
271 {
272
273 __asm __volatile(
274 " " MPLOCKED " "
275 " xaddl %0, %1 ; "
276 "# atomic_fetchadd_int"
277 : "+r" (v), /* 0 (result) */
278 "=m" (*p) /* 1 */
279 : "m" (*p) /* 2 */
280 : "cc");
281 return (v);
282 }
283
284 /*
285 * We assume that a = b will do atomic loads and stores. Due to the
286 * IA32 memory model, a simple store guarantees release semantics.
287 *
288 * However, loads may pass stores, so for atomic_load_acq we have to
289 * ensure a Store/Load barrier to do the load in SMP kernels. We use
290 * "lock cmpxchg" as recommended by the AMD Software Optimization
291 * Guide, and not mfence. For UP kernels, however, the cache of the
292 * single processor is always consistent, so we only need to take care
293 * of the compiler.
294 */
295 #define ATOMIC_STORE(TYPE) \
296 static __inline void \
297 atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\
298 { \
299 __asm __volatile("" : : : "memory"); \
300 *p = v; \
301 } \
302 struct __hack
303
304 #if defined(_KERNEL) && !defined(SMP)
305
306 #define ATOMIC_LOAD(TYPE, LOP) \
307 static __inline u_##TYPE \
308 atomic_load_acq_##TYPE(volatile u_##TYPE *p) \
309 { \
310 u_##TYPE tmp; \
311 \
312 tmp = *p; \
313 __asm __volatile("" : : : "memory"); \
314 return (tmp); \
315 } \
316 struct __hack
317
318 #else /* !(_KERNEL && !SMP) */
319
320 #define ATOMIC_LOAD(TYPE, LOP) \
321 static __inline u_##TYPE \
322 atomic_load_acq_##TYPE(volatile u_##TYPE *p) \
323 { \
324 u_##TYPE res; \
325 \
326 __asm __volatile(MPLOCKED LOP \
327 : "=a" (res), /* 0 */ \
328 "=m" (*p) /* 1 */ \
329 : "m" (*p) /* 2 */ \
330 : "memory", "cc"); \
331 \
332 return (res); \
333 } \
334 struct __hack
335
336 #endif /* _KERNEL && !SMP */
337
338 #endif /* KLD_MODULE || !__GNUCLIKE_ASM */
339
340 ATOMIC_ASM(set, char, "orb %b1,%0", "iq", v);
341 ATOMIC_ASM(clear, char, "andb %b1,%0", "iq", ~v);
342 ATOMIC_ASM(add, char, "addb %b1,%0", "iq", v);
343 ATOMIC_ASM(subtract, char, "subb %b1,%0", "iq", v);
344
345 ATOMIC_ASM(set, short, "orw %w1,%0", "ir", v);
346 ATOMIC_ASM(clear, short, "andw %w1,%0", "ir", ~v);
347 ATOMIC_ASM(add, short, "addw %w1,%0", "ir", v);
348 ATOMIC_ASM(subtract, short, "subw %w1,%0", "ir", v);
349
350 ATOMIC_ASM(set, int, "orl %1,%0", "ir", v);
351 ATOMIC_ASM(clear, int, "andl %1,%0", "ir", ~v);
352 ATOMIC_ASM(add, int, "addl %1,%0", "ir", v);
353 ATOMIC_ASM(subtract, int, "subl %1,%0", "ir", v);
354
355 ATOMIC_ASM(set, long, "orl %1,%0", "ir", v);
356 ATOMIC_ASM(clear, long, "andl %1,%0", "ir", ~v);
357 ATOMIC_ASM(add, long, "addl %1,%0", "ir", v);
358 ATOMIC_ASM(subtract, long, "subl %1,%0", "ir", v);
359
360 ATOMIC_LOAD(char, "cmpxchgb %b0,%1");
361 ATOMIC_LOAD(short, "cmpxchgw %w0,%1");
362 ATOMIC_LOAD(int, "cmpxchgl %0,%1");
363 ATOMIC_LOAD(long, "cmpxchgl %0,%1");
364
365 ATOMIC_STORE(char);
366 ATOMIC_STORE(short);
367 ATOMIC_STORE(int);
368 ATOMIC_STORE(long);
369
370 #undef ATOMIC_ASM
371 #undef ATOMIC_LOAD
372 #undef ATOMIC_STORE
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_ */
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