11.2Sjoerg/* $NetBSD: atomic_xor_32_cas.c,v 1.2 2014/06/23 21:53:45 joerg Exp $ */ 21.1Smartin 31.1Smartin/*- 41.1Smartin * Copyright (c) 2014 The NetBSD Foundation, Inc. 51.1Smartin * All rights reserved. 61.1Smartin * 71.1Smartin * This code is derived from software contributed to The NetBSD Foundation 81.1Smartin * by Jason R. Thorpe. 91.1Smartin * 101.1Smartin * Redistribution and use in source and binary forms, with or without 111.1Smartin * modification, are permitted provided that the following conditions 121.1Smartin * are met: 131.1Smartin * 1. Redistributions of source code must retain the above copyright 141.1Smartin * notice, this list of conditions and the following disclaimer. 151.1Smartin * 2. Redistributions in binary form must reproduce the above copyright 161.1Smartin * notice, this list of conditions and the following disclaimer in the 171.1Smartin * documentation and/or other materials provided with the distribution. 181.1Smartin * 191.1Smartin * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 201.1Smartin * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 211.1Smartin * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 221.1Smartin * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 231.1Smartin * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 241.1Smartin * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 251.1Smartin * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 261.1Smartin * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 271.1Smartin * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 281.1Smartin * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 291.1Smartin * POSSIBILITY OF SUCH DAMAGE. 301.1Smartin */ 311.1Smartin 321.1Smartin#include <sys/atomic.h> 331.1Smartin 341.1Smartinuint32_t fetch_and_xor_4(volatile uint32_t *, uint32_t, ...) 351.1Smartin asm("__sync_fetch_and_xor_4"); 361.1Smartinuint32_t xor_and_fetch_4(volatile uint32_t *, uint32_t, ...) 371.1Smartin asm("__sync_xor_and_fetch_4"); 381.1Smartin 391.1Smartinuint32_t 401.1Smartinfetch_and_xor_4(volatile uint32_t *addr, uint32_t val, ...) 411.1Smartin{ 421.1Smartin uint32_t old, new; 431.1Smartin 441.1Smartin do { 451.1Smartin old = *addr; 461.1Smartin new = old ^ val; 471.1Smartin } while (atomic_cas_32(addr, old, new) != old); 481.1Smartin return old; 491.1Smartin} 501.1Smartin 511.1Smartinuint32_t 521.1Smartinxor_and_fetch_4(volatile uint32_t *addr, uint32_t val, ...) 531.1Smartin{ 541.1Smartin uint32_t old, new; 551.1Smartin 561.1Smartin do { 571.1Smartin old = *addr; 581.1Smartin new = old ^ val; 591.1Smartin } while (atomic_cas_32(addr, old, new) != old); 601.1Smartin return new; 611.1Smartin} 621.2Sjoerg 631.2Sjoerg__strong_alias(__atomic_fetch_xor_4,__sync_fetch_and_xor_4) 64