2 * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
32 #include <sys/mutex.h>
33 #include <sys/atomic.h>
36 #include <sys/kernel.h>
38 struct mtx atomic_mtx;
39 MTX_SYSINIT(atomic, &atomic_mtx, "atomic", MTX_DEF);
43 #define mtx_lock(lock) pthread_mutex_lock(lock)
44 #define mtx_unlock(lock) pthread_mutex_unlock(lock)
46 static pthread_mutex_t atomic_mtx;
48 static __attribute__((constructor)) void
51 pthread_mutex_init(&atomic_mtx, NULL);
55 #if !defined(__LP64__) && !defined(__mips_n32)
57 atomic_add_64(volatile uint64_t *target, int64_t delta)
60 mtx_lock(&atomic_mtx);
62 mtx_unlock(&atomic_mtx);
66 atomic_dec_64(volatile uint64_t *target)
69 mtx_lock(&atomic_mtx);
71 mtx_unlock(&atomic_mtx);
76 atomic_add_64_nv(volatile uint64_t *target, int64_t delta)
80 mtx_lock(&atomic_mtx);
81 newval = (*target += delta);
82 mtx_unlock(&atomic_mtx);
86 #if defined(__powerpc__) || defined(__arm__) || defined(__mips__)
88 atomic_or_8(volatile uint8_t *target, uint8_t value)
90 mtx_lock(&atomic_mtx);
92 mtx_unlock(&atomic_mtx);
97 atomic_or_8_nv(volatile uint8_t *target, uint8_t value)
101 mtx_lock(&atomic_mtx);
102 newval = (*target |= value);
103 mtx_unlock(&atomic_mtx);
108 atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval)
112 mtx_lock(&atomic_mtx);
116 mtx_unlock(&atomic_mtx);
121 atomic_cas_32(volatile uint32_t *target, uint32_t cmp, uint32_t newval)
125 mtx_lock(&atomic_mtx);
129 mtx_unlock(&atomic_mtx);
134 membar_producer(void)