1/*-
2 * Copyright (c) 2003 Jake Burkholder <jake@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Neither the name of the author nor the names of its contributors
11 *    may be used to endorse or promote products derived from this software
12 *    without specific prior written permission.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: releng/10.3/lib/libkse/arch/sparc64/include/atomic_ops.h 174112 2007-11-30 17:20:29Z deischen $
27 */
28
29#ifndef	_ATOMIC_OPS_H_
30#define	_ATOMIC_OPS_H_
31
32#include <machine/atomic.h>
33
34/*
35 * Atomic swap:
36 *   Atomic (tmp = *dst, *dst = val), then *res = tmp
37 *
38 * void atomic_swap_long(long *dst, long val, long *res);
39 */
40static __inline void
41atomic_swap_long(volatile long *dst, long val, long *res)
42{
43	long tmp;
44	long r;
45
46	tmp = *dst;
47	for (;;) {
48		r = atomic_cas_64(dst, tmp, val);
49		if (r == tmp)
50			break;
51		tmp = r;
52	}
53	*res = tmp;
54}
55
56static __inline void
57atomic_swap_int(volatile int *dst, int val, int *res)
58{
59	int tmp;
60	int r;
61
62	tmp = *dst;
63	for (;;) {
64		r = atomic_cas_32(dst, tmp, val);
65		if (r == tmp)
66			break;
67		tmp = r;
68	}
69	*res = tmp;
70}
71
72#define	atomic_swap_ptr(dst, val, res) \
73	atomic_swap_long((volatile long *)dst, (long)val, (long *)res)
74
75#endif
76