The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/i386/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/8.3/sys/i386/include/atomic.h 216869 2011-01-01 08:47:38Z 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")
   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 exp, 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 /*
  124  * Atomic compare and set, used by the mutex functions
  125  *
  126  * if (*dst == exp) *dst = src (all 32 bit words)
  127  *
  128  * Returns 0 on failure, non-zero on success
  129  */
  130 
  131 #ifdef CPU_DISABLE_CMPXCHG
  132 
  133 static __inline int
  134 atomic_cmpset_int(volatile u_int *dst, u_int exp, u_int src)
  135 {
  136         u_char res;
  137 
  138         __asm __volatile(
  139         "       pushfl ;                "
  140         "       cli ;                   "
  141         "       cmpl    %3,%4 ;         "
  142         "       jne     1f ;            "
  143         "       movl    %2,%1 ;         "
  144         "1:                             "
  145         "       sete    %0 ;            "
  146         "       popfl ;                 "
  147         "# atomic_cmpset_int"
  148         : "=q" (res),                   /* 0 */
  149           "=m" (*dst)                   /* 1 */
  150         : "r" (src),                    /* 2 */
  151           "r" (exp),                    /* 3 */
  152           "m" (*dst)                    /* 4 */
  153         : "memory");
  154 
  155         return (res);
  156 }
  157 
  158 #else /* !CPU_DISABLE_CMPXCHG */
  159 
  160 static __inline int
  161 atomic_cmpset_int(volatile u_int *dst, u_int exp, u_int src)
  162 {
  163         u_char res;
  164 
  165         __asm __volatile(
  166         "       " MPLOCKED "            "
  167         "       cmpxchgl %2,%1 ;        "
  168         "       sete    %0 ;            "
  169         "1:                             "
  170         "# atomic_cmpset_int"
  171         : "=a" (res),                   /* 0 */
  172           "=m" (*dst)                   /* 1 */
  173         : "r" (src),                    /* 2 */
  174           "a" (exp),                    /* 3 */
  175           "m" (*dst)                    /* 4 */
  176         : "memory", "cc");
  177 
  178         return (res);
  179 }
  180 
  181 #endif /* CPU_DISABLE_CMPXCHG */
  182 
  183 /*
  184  * Atomically add the value of v to the integer pointed to by p and return
  185  * the previous value of *p.
  186  */
  187 static __inline u_int
  188 atomic_fetchadd_int(volatile u_int *p, u_int v)
  189 {
  190 
  191         __asm __volatile(
  192         "       " MPLOCKED "            "
  193         "       xaddl   %0, %1 ;        "
  194         "# atomic_fetchadd_int"
  195         : "+r" (v),                     /* 0 (result) */
  196           "=m" (*p)                     /* 1 */
  197         : "m" (*p)                      /* 2 */
  198         : "cc");
  199         return (v);
  200 }
  201 
  202 #if defined(_KERNEL) && !defined(SMP)
  203 
  204 /*
  205  * We assume that a = b will do atomic loads and stores.  However, on a
  206  * PentiumPro or higher, reads may pass writes, so for that case we have
  207  * to use a serializing instruction (i.e. with LOCK) to do the load in
  208  * SMP kernels.  For UP kernels, however, the cache of the single processor
  209  * is always consistent, so we only need to take care of compiler.
  210  */
  211 #define ATOMIC_STORE_LOAD(TYPE, LOP, SOP)               \
  212 static __inline u_##TYPE                                \
  213 atomic_load_acq_##TYPE(volatile u_##TYPE *p)            \
  214 {                                                       \
  215         u_##TYPE tmp;                                   \
  216                                                         \
  217         tmp = *p;                                       \
  218         __asm __volatile("" : : : "memory");            \
  219         return (tmp);                                   \
  220 }                                                       \
  221                                                         \
  222 static __inline void                                    \
  223 atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\
  224 {                                                       \
  225         __asm __volatile("" : : : "memory");            \
  226         *p = v;                                         \
  227 }                                                       \
  228 struct __hack
  229 
  230 #else /* !(_KERNEL && !SMP) */
  231 
  232 #define ATOMIC_STORE_LOAD(TYPE, LOP, SOP)               \
  233 static __inline u_##TYPE                                \
  234 atomic_load_acq_##TYPE(volatile u_##TYPE *p)            \
  235 {                                                       \
  236         u_##TYPE res;                                   \
  237                                                         \
  238         __asm __volatile(MPLOCKED LOP                   \
  239         : "=a" (res),                   /* 0 */         \
  240           "=m" (*p)                     /* 1 */         \
  241         : "m" (*p)                      /* 2 */         \
  242         : "memory", "cc");                              \
  243                                                         \
  244         return (res);                                   \
  245 }                                                       \
  246                                                         \
  247 /*                                                      \
  248  * The XCHG instruction asserts LOCK automagically.     \
  249  */                                                     \
  250 static __inline void                                    \
  251 atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v)\
  252 {                                                       \
  253         __asm __volatile(SOP                            \
  254         : "=m" (*p),                    /* 0 */         \
  255           "+r" (v)                      /* 1 */         \
  256         : "m" (*p)                      /* 2 */         \
  257         : "memory");                                    \
  258 }                                                       \
  259 struct __hack
  260 
  261 #endif /* _KERNEL && !SMP */
  262 
  263 #endif /* KLD_MODULE || !__GNUCLIKE_ASM */
  264 
  265 ATOMIC_ASM(set,      char,  "orb %b1,%0",  "iq",  v);
  266 ATOMIC_ASM(clear,    char,  "andb %b1,%0", "iq", ~v);
  267 ATOMIC_ASM(add,      char,  "addb %b1,%0", "iq",  v);
  268 ATOMIC_ASM(subtract, char,  "subb %b1,%0", "iq",  v);
  269 
  270 ATOMIC_ASM(set,      short, "orw %w1,%0",  "ir",  v);
  271 ATOMIC_ASM(clear,    short, "andw %w1,%0", "ir", ~v);
  272 ATOMIC_ASM(add,      short, "addw %w1,%0", "ir",  v);
  273 ATOMIC_ASM(subtract, short, "subw %w1,%0", "ir",  v);
  274 
  275 ATOMIC_ASM(set,      int,   "orl %1,%0",   "ir",  v);
  276 ATOMIC_ASM(clear,    int,   "andl %1,%0",  "ir", ~v);
  277 ATOMIC_ASM(add,      int,   "addl %1,%0",  "ir",  v);
  278 ATOMIC_ASM(subtract, int,   "subl %1,%0",  "ir",  v);
  279 
  280 ATOMIC_ASM(set,      long,  "orl %1,%0",   "ir",  v);
  281 ATOMIC_ASM(clear,    long,  "andl %1,%0",  "ir", ~v);
  282 ATOMIC_ASM(add,      long,  "addl %1,%0",  "ir",  v);
  283 ATOMIC_ASM(subtract, long,  "subl %1,%0",  "ir",  v);
  284 
  285 ATOMIC_STORE_LOAD(char, "cmpxchgb %b0,%1", "xchgb %b1,%0");
  286 ATOMIC_STORE_LOAD(short,"cmpxchgw %w0,%1", "xchgw %w1,%0");
  287 ATOMIC_STORE_LOAD(int,  "cmpxchgl %0,%1",  "xchgl %1,%0");
  288 ATOMIC_STORE_LOAD(long, "cmpxchgl %0,%1",  "xchgl %1,%0");
  289 
  290 #undef ATOMIC_ASM
  291 #undef ATOMIC_STORE_LOAD
  292 
  293 #ifndef WANT_FUNCTIONS
  294 
  295 static __inline int
  296 atomic_cmpset_long(volatile u_long *dst, u_long exp, u_long src)
  297 {
  298 
  299         return (atomic_cmpset_int((volatile u_int *)dst, (u_int)exp,
  300             (u_int)src));
  301 }
  302 
  303 static __inline u_long
  304 atomic_fetchadd_long(volatile u_long *p, u_long v)
  305 {
  306 
  307         return (atomic_fetchadd_int((volatile u_int *)p, (u_int)v));
  308 }
  309 
  310 /* Read the current value and store a zero in the destination. */
  311 #ifdef __GNUCLIKE_ASM
  312 
  313 static __inline u_int
  314 atomic_readandclear_int(volatile u_int *addr)
  315 {
  316         u_int res;
  317 
  318         res = 0;
  319         __asm __volatile(
  320         "       xchgl   %1,%0 ;         "
  321         "# atomic_readandclear_int"
  322         : "+r" (res),                   /* 0 */
  323           "=m" (*addr)                  /* 1 */
  324         : "m" (*addr));
  325 
  326         return (res);
  327 }
  328 
  329 static __inline u_long
  330 atomic_readandclear_long(volatile u_long *addr)
  331 {
  332         u_long res;
  333 
  334         res = 0;
  335         __asm __volatile(
  336         "       xchgl   %1,%0 ;         "
  337         "# atomic_readandclear_long"
  338         : "+r" (res),                   /* 0 */
  339           "=m" (*addr)                  /* 1 */
  340         : "m" (*addr));
  341 
  342         return (res);
  343 }
  344 
  345 #else /* !__GNUCLIKE_ASM */
  346 
  347 u_int   atomic_readandclear_int(volatile u_int *addr);
  348 u_long  atomic_readandclear_long(volatile u_long *addr);
  349 
  350 #endif /* __GNUCLIKE_ASM */
  351 
  352 #define atomic_set_acq_char             atomic_set_barr_char
  353 #define atomic_set_rel_char             atomic_set_barr_char
  354 #define atomic_clear_acq_char           atomic_clear_barr_char
  355 #define atomic_clear_rel_char           atomic_clear_barr_char
  356 #define atomic_add_acq_char             atomic_add_barr_char
  357 #define atomic_add_rel_char             atomic_add_barr_char
  358 #define atomic_subtract_acq_char        atomic_subtract_barr_char
  359 #define atomic_subtract_rel_char        atomic_subtract_barr_char
  360 
  361 #define atomic_set_acq_short            atomic_set_barr_short
  362 #define atomic_set_rel_short            atomic_set_barr_short
  363 #define atomic_clear_acq_short          atomic_clear_barr_short
  364 #define atomic_clear_rel_short          atomic_clear_barr_short
  365 #define atomic_add_acq_short            atomic_add_barr_short
  366 #define atomic_add_rel_short            atomic_add_barr_short
  367 #define atomic_subtract_acq_short       atomic_subtract_barr_short
  368 #define atomic_subtract_rel_short       atomic_subtract_barr_short
  369 
  370 #define atomic_set_acq_int              atomic_set_barr_int
  371 #define atomic_set_rel_int              atomic_set_barr_int
  372 #define atomic_clear_acq_int            atomic_clear_barr_int
  373 #define atomic_clear_rel_int            atomic_clear_barr_int
  374 #define atomic_add_acq_int              atomic_add_barr_int
  375 #define atomic_add_rel_int              atomic_add_barr_int
  376 #define atomic_subtract_acq_int         atomic_subtract_barr_int
  377 #define atomic_subtract_rel_int         atomic_subtract_barr_int
  378 #define atomic_cmpset_acq_int           atomic_cmpset_int
  379 #define atomic_cmpset_rel_int           atomic_cmpset_int
  380 
  381 #define atomic_set_acq_long             atomic_set_barr_long
  382 #define atomic_set_rel_long             atomic_set_barr_long
  383 #define atomic_clear_acq_long           atomic_clear_barr_long
  384 #define atomic_clear_rel_long           atomic_clear_barr_long
  385 #define atomic_add_acq_long             atomic_add_barr_long
  386 #define atomic_add_rel_long             atomic_add_barr_long
  387 #define atomic_subtract_acq_long        atomic_subtract_barr_long
  388 #define atomic_subtract_rel_long        atomic_subtract_barr_long
  389 #define atomic_cmpset_acq_long          atomic_cmpset_long
  390 #define atomic_cmpset_rel_long          atomic_cmpset_long
  391 
  392 /* Operations on 8-bit bytes. */
  393 #define atomic_set_8            atomic_set_char
  394 #define atomic_set_acq_8        atomic_set_acq_char
  395 #define atomic_set_rel_8        atomic_set_rel_char
  396 #define atomic_clear_8          atomic_clear_char
  397 #define atomic_clear_acq_8      atomic_clear_acq_char
  398 #define atomic_clear_rel_8      atomic_clear_rel_char
  399 #define atomic_add_8            atomic_add_char
  400 #define atomic_add_acq_8        atomic_add_acq_char
  401 #define atomic_add_rel_8        atomic_add_rel_char
  402 #define atomic_subtract_8       atomic_subtract_char
  403 #define atomic_subtract_acq_8   atomic_subtract_acq_char
  404 #define atomic_subtract_rel_8   atomic_subtract_rel_char
  405 #define atomic_load_acq_8       atomic_load_acq_char
  406 #define atomic_store_rel_8      atomic_store_rel_char
  407 
  408 /* Operations on 16-bit words. */
  409 #define atomic_set_16           atomic_set_short
  410 #define atomic_set_acq_16       atomic_set_acq_short
  411 #define atomic_set_rel_16       atomic_set_rel_short
  412 #define atomic_clear_16         atomic_clear_short
  413 #define atomic_clear_acq_16     atomic_clear_acq_short
  414 #define atomic_clear_rel_16     atomic_clear_rel_short
  415 #define atomic_add_16           atomic_add_short
  416 #define atomic_add_acq_16       atomic_add_acq_short
  417 #define atomic_add_rel_16       atomic_add_rel_short
  418 #define atomic_subtract_16      atomic_subtract_short
  419 #define atomic_subtract_acq_16  atomic_subtract_acq_short
  420 #define atomic_subtract_rel_16  atomic_subtract_rel_short
  421 #define atomic_load_acq_16      atomic_load_acq_short
  422 #define atomic_store_rel_16     atomic_store_rel_short
  423 
  424 /* Operations on 32-bit double words. */
  425 #define atomic_set_32           atomic_set_int
  426 #define atomic_set_acq_32       atomic_set_acq_int
  427 #define atomic_set_rel_32       atomic_set_rel_int
  428 #define atomic_clear_32         atomic_clear_int
  429 #define atomic_clear_acq_32     atomic_clear_acq_int
  430 #define atomic_clear_rel_32     atomic_clear_rel_int
  431 #define atomic_add_32           atomic_add_int
  432 #define atomic_add_acq_32       atomic_add_acq_int
  433 #define atomic_add_rel_32       atomic_add_rel_int
  434 #define atomic_subtract_32      atomic_subtract_int
  435 #define atomic_subtract_acq_32  atomic_subtract_acq_int
  436 #define atomic_subtract_rel_32  atomic_subtract_rel_int
  437 #define atomic_load_acq_32      atomic_load_acq_int
  438 #define atomic_store_rel_32     atomic_store_rel_int
  439 #define atomic_cmpset_32        atomic_cmpset_int
  440 #define atomic_cmpset_acq_32    atomic_cmpset_acq_int
  441 #define atomic_cmpset_rel_32    atomic_cmpset_rel_int
  442 #define atomic_readandclear_32  atomic_readandclear_int
  443 #define atomic_fetchadd_32      atomic_fetchadd_int
  444 
  445 /* Operations on pointers. */
  446 #define atomic_set_ptr(p, v) \
  447         atomic_set_int((volatile u_int *)(p), (u_int)(v))
  448 #define atomic_set_acq_ptr(p, v) \
  449         atomic_set_acq_int((volatile u_int *)(p), (u_int)(v))
  450 #define atomic_set_rel_ptr(p, v) \
  451         atomic_set_rel_int((volatile u_int *)(p), (u_int)(v))
  452 #define atomic_clear_ptr(p, v) \
  453         atomic_clear_int((volatile u_int *)(p), (u_int)(v))
  454 #define atomic_clear_acq_ptr(p, v) \
  455         atomic_clear_acq_int((volatile u_int *)(p), (u_int)(v))
  456 #define atomic_clear_rel_ptr(p, v) \
  457         atomic_clear_rel_int((volatile u_int *)(p), (u_int)(v))
  458 #define atomic_add_ptr(p, v) \
  459         atomic_add_int((volatile u_int *)(p), (u_int)(v))
  460 #define atomic_add_acq_ptr(p, v) \
  461         atomic_add_acq_int((volatile u_int *)(p), (u_int)(v))
  462 #define atomic_add_rel_ptr(p, v) \
  463         atomic_add_rel_int((volatile u_int *)(p), (u_int)(v))
  464 #define atomic_subtract_ptr(p, v) \
  465         atomic_subtract_int((volatile u_int *)(p), (u_int)(v))
  466 #define atomic_subtract_acq_ptr(p, v) \
  467         atomic_subtract_acq_int((volatile u_int *)(p), (u_int)(v))
  468 #define atomic_subtract_rel_ptr(p, v) \
  469         atomic_subtract_rel_int((volatile u_int *)(p), (u_int)(v))
  470 #define atomic_load_acq_ptr(p) \
  471         atomic_load_acq_int((volatile u_int *)(p))
  472 #define atomic_store_rel_ptr(p, v) \
  473         atomic_store_rel_int((volatile u_int *)(p), (v))
  474 #define atomic_cmpset_ptr(dst, old, new) \
  475         atomic_cmpset_int((volatile u_int *)(dst), (u_int)(old), (u_int)(new))
  476 #define atomic_cmpset_acq_ptr(dst, old, new) \
  477         atomic_cmpset_acq_int((volatile u_int *)(dst), (u_int)(old), \
  478             (u_int)(new))
  479 #define atomic_cmpset_rel_ptr(dst, old, new) \
  480         atomic_cmpset_rel_int((volatile u_int *)(dst), (u_int)(old), \
  481             (u_int)(new))
  482 #define atomic_readandclear_ptr(p) \
  483         atomic_readandclear_int((volatile u_int *)(p))
  484 
  485 #endif /* !WANT_FUNCTIONS */
  486 
  487 #endif /* !_MACHINE_ATOMIC_H_ */

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