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      1 /*	$NetBSD: atomic_and_32_cas.c,v 1.10 2014/06/23 21:53:45 joerg 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 fetch_and_and_4(volatile uint32_t *, uint32_t, ...)
     37 #if defined(_LIBC) || defined(_HARDKERNEL)
     38     asm("__sync_fetch_and_and_4");	/* C runtime internal */
     39 #else
     40     ;
     41 #endif
     42 
     43 uint32_t
     44 fetch_and_and_4(volatile uint32_t *addr, uint32_t val, ...)
     45 {
     46 	uint32_t old, new;
     47 
     48 	do {
     49 		old = *addr;
     50 		new = old & val;
     51 	} while (atomic_cas_32(addr, old, new) != old);
     52 	return old;
     53 }
     54 
     55 void
     56 atomic_and_32(volatile uint32_t *addr, uint32_t val)
     57 {
     58 	(void) fetch_and_and_4(addr, val);
     59 }
     60 
     61 __strong_alias(__atomic_fetch_and_4,__sync_fetch_and_and_4)
     62 
     63 #undef atomic_and_32
     64 atomic_op_alias(atomic_and_32,_atomic_and_32)
     65 
     66 #undef atomic_and_uint
     67 atomic_op_alias(atomic_and_uint,_atomic_and_32)
     68 __strong_alias(_atomic_and_uint,_atomic_and_32)
     69 #if !defined(_LP64)
     70 #undef atomic_and_ulong
     71 atomic_op_alias(atomic_and_ulong,_atomic_and_32)
     72 __strong_alias(_atomic_and_ulong,_atomic_and_32)
     73 #endif /* _LP64 */
     74