1 /* $NetBSD: atomic_add_32_cas.c,v 1.9 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_add_4(volatile uint32_t *, uint32_t, ...) 37 #if defined(_LIBC) || defined(_HARDKERNEL) 38 asm("__sync_fetch_and_add_4"); /* C runtime internal */ 39 #else 40 ; 41 #endif 42 43 uint32_t 44 fetch_and_add_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_add_32(volatile uint32_t *addr, int32_t val) 57 { 58 (void) fetch_and_add_4(addr, val); 59 } 60 61 #undef atomic_add_32 62 atomic_op_alias(atomic_add_32,_atomic_add_32) 63 64 #undef atomic_add_int 65 atomic_op_alias(atomic_add_int,_atomic_add_32) 66 __strong_alias(_atomic_add_int,_atomic_add_32) 67 68 #if !defined(_LP64) 69 #undef atomic_add_long 70 atomic_op_alias(atomic_add_long,_atomic_add_32) 71 __strong_alias(_atomic_add_long,_atomic_add_32) 72 73 #undef atomic_add_ptr 74 atomic_op_alias(atomic_add_ptr,_atomic_add_32) 75 __strong_alias(_atomic_add_ptr,_atomic_add_32) 76 #endif /* _LP64 */ 77 78 __strong_alias(__atomic_fetch_add_4,__sync_fetch_and_add_4) 79