1 /* $NetBSD: atomic_and_64_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 #ifdef __HAVE_ATOMIC64_OPS 37 38 uint64_t fetch_and_and_8(volatile uint64_t *, uint64_t, ...) 39 asm("__sync_fetch_and_and_8"); 40 41 uint64_t 42 fetch_and_and_8(volatile uint64_t *addr, uint64_t val, ...) 43 { 44 uint64_t old, new; 45 46 do { 47 old = *addr; 48 new = old & val; 49 } while (atomic_cas_64(addr, old, new) != old); 50 return old; 51 } 52 53 void 54 atomic_and_64(volatile uint64_t *addr, uint64_t val) 55 { 56 (void) fetch_and_and_8(addr, val); 57 } 58 59 __strong_alias(__atomic_fetch_and_8,__sync_fetch_and_and_8) 60 61 #undef atomic_and_64 62 atomic_op_alias(atomic_and_64,_atomic_and_64) 63 64 #if defined(_LP64) 65 #undef atomic_and_ulong 66 atomic_op_alias(atomic_and_ulong,_atomic_and_64) 67 __strong_alias(_atomic_and_ulong,_atomic_and_64) 68 #endif /* _LP64 */ 69 70 #endif 71