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
atomic_init(void)49 atomic_init(void)
50 {
51 pthread_mutex_init(&atomic_mtx, NULL);
52 }
53 #endif
54
55 #if !defined(__LP64__) && !defined(__mips_n32) && \
56 !defined(ARM_HAVE_ATOMIC64) && !defined(I386_HAVE_ATOMIC64)
57 void
atomic_add_64(volatile uint64_t * target,int64_t delta)58 atomic_add_64(volatile uint64_t *target, int64_t delta)
59 {
60
61 mtx_lock(&atomic_mtx);
62 *target += delta;
63 mtx_unlock(&atomic_mtx);
64 }
65
66 void
atomic_dec_64(volatile uint64_t * target)67 atomic_dec_64(volatile uint64_t *target)
68 {
69
70 mtx_lock(&atomic_mtx);
71 *target -= 1;
72 mtx_unlock(&atomic_mtx);
73 }
74 #endif
75
76 uint64_t
atomic_add_64_nv(volatile uint64_t * target,int64_t delta)77 atomic_add_64_nv(volatile uint64_t *target, int64_t delta)
78 {
79 uint64_t newval;
80
81 mtx_lock(&atomic_mtx);
82 newval = (*target += delta);
83 mtx_unlock(&atomic_mtx);
84 return (newval);
85 }
86
87 #if defined(__powerpc__) || defined(__arm__) || defined(__mips__)
88 void
atomic_or_8(volatile uint8_t * target,uint8_t value)89 atomic_or_8(volatile uint8_t *target, uint8_t value)
90 {
91 mtx_lock(&atomic_mtx);
92 *target |= value;
93 mtx_unlock(&atomic_mtx);
94 }
95 #endif
96
97 uint8_t
atomic_or_8_nv(volatile uint8_t * target,uint8_t value)98 atomic_or_8_nv(volatile uint8_t *target, uint8_t value)
99 {
100 uint8_t newval;
101
102 mtx_lock(&atomic_mtx);
103 newval = (*target |= value);
104 mtx_unlock(&atomic_mtx);
105 return (newval);
106 }
107
108 uint64_t
atomic_cas_64(volatile uint64_t * target,uint64_t cmp,uint64_t newval)109 atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval)
110 {
111 uint64_t oldval;
112
113 mtx_lock(&atomic_mtx);
114 oldval = *target;
115 if (oldval == cmp)
116 *target = newval;
117 mtx_unlock(&atomic_mtx);
118 return (oldval);
119 }
120
121 uint32_t
atomic_cas_32(volatile uint32_t * target,uint32_t cmp,uint32_t newval)122 atomic_cas_32(volatile uint32_t *target, uint32_t cmp, uint32_t newval)
123 {
124 uint32_t oldval;
125
126 mtx_lock(&atomic_mtx);
127 oldval = *target;
128 if (oldval == cmp)
129 *target = newval;
130 mtx_unlock(&atomic_mtx);
131 return (oldval);
132 }
133
134 void
membar_producer(void)135 membar_producer(void)
136 {
137 /* nothing */
138 }
139