1/*-
2 * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@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. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <sys/param.h>
31#include <sys/lock.h>
32#include <sys/mutex.h>
33#include <sys/atomic.h>
34
35#ifdef _KERNEL
36#include <sys/kernel.h>
37
38struct mtx atomic_mtx;
39MTX_SYSINIT(atomic, &atomic_mtx, "atomic", MTX_DEF);
40#else
41#include <pthread.h>
42
43#define	mtx_lock(lock)		pthread_mutex_lock(lock)
44#define	mtx_unlock(lock)	pthread_mutex_unlock(lock)
45
46static pthread_mutex_t atomic_mtx;
47
48static __attribute__((constructor)) void
49atomic_init(void)
50{
51	pthread_mutex_init(&atomic_mtx, NULL);
52}
53#endif
54
55#if !defined(__LP64__) && !defined(__mips_n32) && !defined(ARM_HAVE_ATOMIC64)
56void
57atomic_add_64(volatile uint64_t *target, int64_t delta)
58{
59
60	mtx_lock(&atomic_mtx);
61	*target += delta;
62	mtx_unlock(&atomic_mtx);
63}
64
65void
66atomic_dec_64(volatile uint64_t *target)
67{
68
69	mtx_lock(&atomic_mtx);
70	*target -= 1;
71	mtx_unlock(&atomic_mtx);
72}
73#endif
74
75uint64_t
76atomic_add_64_nv(volatile uint64_t *target, int64_t delta)
77{
78	uint64_t newval;
79
80	mtx_lock(&atomic_mtx);
81	newval = (*target += delta);
82	mtx_unlock(&atomic_mtx);
83	return (newval);
84}
85
86#if defined(__powerpc__) || defined(__arm__) || defined(__mips__)
87void
88atomic_or_8(volatile uint8_t *target, uint8_t value)
89{
90	mtx_lock(&atomic_mtx);
91	*target |= value;
92	mtx_unlock(&atomic_mtx);
93}
94#endif
95
96uint8_t
97atomic_or_8_nv(volatile uint8_t *target, uint8_t value)
98{
99	uint8_t newval;
100
101	mtx_lock(&atomic_mtx);
102	newval = (*target |= value);
103	mtx_unlock(&atomic_mtx);
104	return (newval);
105}
106
107uint64_t
108atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval)
109{
110	uint64_t oldval;
111
112	mtx_lock(&atomic_mtx);
113	oldval = *target;
114	if (oldval == cmp)
115		*target = newval;
116	mtx_unlock(&atomic_mtx);
117	return (oldval);
118}
119
120uint32_t
121atomic_cas_32(volatile uint32_t *target, uint32_t cmp, uint32_t newval)
122{
123	uint32_t oldval;
124
125	mtx_lock(&atomic_mtx);
126	oldval = *target;
127	if (oldval == cmp)
128		*target = newval;
129	mtx_unlock(&atomic_mtx);
130	return (oldval);
131}
132
133void
134membar_producer(void)
135{
136	/* nothing */
137}
138