1/*	$NetBSD: atomic_xor_8_cas.c,v 1.3 2014/06/23 21:53:45 joerg 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 "atomic_op_namespace.h"
33
34#include <sys/atomic.h>
35
36uint8_t fetch_and_xor_1(volatile uint8_t *, uint8_t, ...)
37    asm("__sync_fetch_and_xor_1");
38uint8_t xor_and_fetch_1(volatile uint8_t *, uint8_t, ...)
39    asm("__sync_xor_and_fetch_1");
40
41uint8_t
42fetch_and_xor_1(volatile uint8_t *addr, uint8_t val, ...)
43{
44	uint8_t old, new;
45
46	do {
47		old = *addr;
48		new = old ^ val;
49	} while (atomic_cas_8(addr, old, new) != old);
50	return old;
51}
52
53uint8_t
54xor_and_fetch_1(volatile uint8_t *addr, uint8_t val, ...)
55{
56	uint8_t old, new;
57
58	do {
59		old = *addr;
60		new = old ^ val;
61	} while (atomic_cas_8(addr, old, new) != old);
62	return new;
63}
64
65__strong_alias(__atomic_fetch_xor_1,__sync_fetch_and_xor_1)
66