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      1 /*	$NetBSD: atomic_or_32_nv_cas.c,v 1.6 2014/02/22 17:08:30 martin Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2007 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include "atomic_op_namespace.h"
     33 
     34 #include <sys/atomic.h>
     35 
     36 uint32_t
     37 atomic_or_32_nv(volatile uint32_t *addr, uint32_t val)
     38 {
     39 	uint32_t old, new;
     40 
     41 	do {
     42 		old = *addr;
     43 		new = old | val;
     44 	} while (atomic_cas_32(addr, old, new) != old);
     45 
     46 	return (new);
     47 }
     48 
     49 #undef atomic_or_32_nv
     50 atomic_op_alias(atomic_or_32_nv,_atomic_or_32_nv)
     51 crt_alias(__sync_or_and_fetch_4,_atomic_or_32_nv)
     52 
     53 #undef atomic_or_uint_nv
     54 atomic_op_alias(atomic_or_uint_nv,_atomic_or_32_nv)
     55 __strong_alias(_atomic_or_uint_nv,_atomic_or_32_nv)
     56 #if !defined(_LP64)
     57 #undef atomic_or_ulong_nv
     58 atomic_op_alias(atomic_or_ulong_nv,_atomic_or_32_nv)
     59 __strong_alias(_atomic_or_ulong_nv,_atomic_or_32_nv)
     60 #endif /* _LP64 */
     61