xref: /freebsd/sys/cddl/compat/opensolaris/kern/opensolaris_atomic.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
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 
38 struct mtx atomic_mtx;
39 MTX_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 
46 static pthread_mutex_t atomic_mtx;
47 
48 static __attribute__((constructor)) void
49 atomic_init(void)
50 {
51 	pthread_mutex_init(&atomic_mtx, NULL);
52 }
53 #endif
54 
55 #ifndef __LP64__
56 void
57 atomic_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 
66 uint64_t
67 atomic_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__)
78 void
79 atomic_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 
87 uint8_t
88 atomic_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__
99 void *
100 atomic_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__
115 uint64_t
116 atomic_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 
129 void
130 membar_producer(void)
131 {
132 	/* nothing */
133 }
134