1/* $NetBSD: atomic_nand_32_cas.c,v 1.2 2019/03/01 06:14:52 isaki Exp $ */ 2 3/*- 4 * Copyright (c) 2014 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 <sys/atomic.h> 33 34uint32_t fetch_and_nand_4(volatile uint32_t *, uint32_t, ...) 35 asm("__sync_fetch_and_nand_4"); 36uint32_t nand_and_fetch_4(volatile uint32_t *, uint32_t, ...) 37 asm("__sync_nand_and_fetch_4"); 38 39uint32_t 40fetch_and_nand_4(volatile uint32_t *addr, uint32_t val, ...) 41{ 42 uint32_t old, new; 43 44 do { 45 old = *addr; 46 new = ~(old & val); 47 } while (atomic_cas_32(addr, old, new) != old); 48 return old; 49} 50 51uint32_t 52nand_and_fetch_4(volatile uint32_t *addr, uint32_t val, ...) 53{ 54 uint32_t old, new; 55 56 do { 57 old = *addr; 58 new = ~(old & val); 59 } while (atomic_cas_32(addr, old, new) != old); 60 return new; 61} 62 63__strong_alias(__atomic_fetch_nand_4,__sync_fetch_and_nand_4) 64