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atomic_and_32_cas.c revision 1.2 
      1  1.2  ad /*	$NetBSD: atomic_and_32_cas.c,v 1.2 2007/11/28 16:55:00 ad Exp $	*/
      2  1.2  ad 
      3  1.2  ad /*-
      4  1.2  ad  * Copyright (c) 2007 The NetBSD Foundation, Inc.
      5  1.2  ad  * All rights reserved.
      6  1.2  ad  *
      7  1.2  ad  * This code is derived from software contributed to The NetBSD Foundation
      8  1.2  ad  * by Jason R. Thorpe.
      9  1.2  ad  *
     10  1.2  ad  * Redistribution and use in source and binary forms, with or without
     11  1.2  ad  * modification, are permitted provided that the following conditions
     12  1.2  ad  * are met:
     13  1.2  ad  * 1. Redistributions of source code must retain the above copyright
     14  1.2  ad  *    notice, this list of conditions and the following disclaimer.
     15  1.2  ad  * 2. Redistributions in binary form must reproduce the above copyright
     16  1.2  ad  *    notice, this list of conditions and the following disclaimer in the
     17  1.2  ad  *    documentation and/or other materials provided with the distribution.
     18  1.2  ad  * 3. All advertising materials mentioning features or use of this software
     19  1.2  ad  *    must display the following acknowledgement:
     20  1.2  ad  *	This product includes software developed by the NetBSD
     21  1.2  ad  *	Foundation, Inc. and its contributors.
     22  1.2  ad  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  1.2  ad  *    contributors may be used to endorse or promote products derived
     24  1.2  ad  *    from this software without specific prior written permission.
     25  1.2  ad  *
     26  1.2  ad  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  1.2  ad  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  1.2  ad  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  1.2  ad  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  1.2  ad  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  1.2  ad  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  1.2  ad  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  1.2  ad  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  1.2  ad  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  1.2  ad  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  1.2  ad  * POSSIBILITY OF SUCH DAMAGE.
     37  1.2  ad  */
     38  1.2  ad 
     39  1.2  ad #include "atomic_op_namespace.h"
     40  1.2  ad 
     41  1.2  ad #include <sys/atomic.h>
     42  1.2  ad #include "atomic_op_cas_impl.h"
     43  1.2  ad 
     44  1.2  ad void
     45  1.2  ad atomic_and_32(volatile uint32_t *addr, uint32_t val)
     46  1.2  ad {
     47  1.2  ad 	uint32_t old, new;
     48  1.2  ad 
     49  1.2  ad 	do {
     50  1.2  ad 		OP_READ_BARRIER;
     51  1.2  ad 		old = *addr;
     52  1.2  ad 
     53  1.2  ad 		new = old & val;
     54  1.2  ad 	} while (atomic_cas_32(addr, old, new) != old);
     55  1.2  ad }
     56  1.2  ad 
     57  1.2  ad #undef atomic_and_32
     58  1.2  ad atomic_op_alias(atomic_and_32,_atomic_and_32)
     59  1.2  ad #undef atomic_and_uint
     60  1.2  ad atomic_op_alias(atomic_and_uint,_atomic_and_32)
     61  1.2  ad __strong_alias(_atomic_and_uint,_atomic_and_32)
     62  1.2  ad #if !defined(_LP64)
     63  1.2  ad #undef atomic_and_ulong
     64  1.2  ad atomic_op_alias(atomic_and_ulong,_atomic_and_32)
     65  1.2  ad __strong_alias(_atomic_and_ulong,_atomic_and_32)
     66  1.2  ad #endif /* _LP64 */
     67