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