opensolaris_atomic.c revision 170431 
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: head/sys/cddl/compat/opensolaris/kern/opensolaris_atomic.c 170431 2007-06-08 12:35:47Z pjd $");
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#ifndef __LP64__
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#endif
65
66uint64_t
67atomic_add_64_nv(volatile uint64_t *target, int64_t delta)
68{
69	uint64_t newval;
70
71	mtx_lock(&atomic_mtx);
72	newval = (*target += delta);
73	mtx_unlock(&atomic_mtx);
74	return (newval);
75}
76
77#if defined(__sparc64__) || defined(__powerpc__) || defined(__arm__)
78void
79atomic_or_8(volatile uint8_t *target, uint8_t value)
80{
81	mtx_lock(&atomic_mtx);
82	*target |= value;
83	mtx_unlock(&atomic_mtx);
84}
85#endif
86
87uint8_t
88atomic_or_8_nv(volatile uint8_t *target, uint8_t value)
89{
90	uint8_t newval;
91
92	mtx_lock(&atomic_mtx);
93	newval = (*target |= value);
94	mtx_unlock(&atomic_mtx);
95	return (newval);
96}
97
98#ifndef __LP64__
99void *
100atomic_cas_ptr(volatile void *target, void *cmp,  void *newval)
101{
102	void *oldval, **trg;
103
104	mtx_lock(&atomic_mtx);
105	trg = __DEVOLATILE(void **, target);
106	oldval = *trg;
107	if (oldval == cmp)
108		*trg = newval;
109	mtx_unlock(&atomic_mtx);
110	return (oldval);
111}
112#endif
113
114#ifndef __sparc64__
115uint64_t
116atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval)
117{
118	uint64_t oldval;
119
120	mtx_lock(&atomic_mtx);
121	oldval = *target;
122	if (oldval == cmp)
123		*target = newval;
124	mtx_unlock(&atomic_mtx);
125	return (oldval);
126}
127#endif
128
129void
130membar_producer(void)
131{
132	/* nothing */
133}
134