source: rtems-libbsd/rtemsbsd/powerpc/include/asm/atomic.h

6-freebsd-12
Last change on this file was 28ee86a, checked in by Sebastian Huber <sebastian.huber@…>, on Apr 27, 2016 at 9:58:19 AM

Import DPAA driver snapshot

Imported from Freescale Linux repository

git://git.freescale.com/ppc/upstream/linux.git

commit 2774c204cd8bfc56a200ff4dcdfc9cdf5b6fc161.

Linux compatibility layer is partly from FreeBSD.

  • Property mode set to 100644
File size: 3.2 KB
Line 
1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice unmodified, this list of conditions, and the following
13 *    disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * $FreeBSD$
30 */
31#ifndef _ASM_ATOMIC_H_
32#define _ASM_ATOMIC_H_
33
34#include <sys/cdefs.h>
35#include <sys/types.h>
36#include <machine/atomic.h>
37
38typedef struct {
39        volatile u_int counter;
40} atomic_t;
41
42#define ATOMIC_INIT(v) { (v) }
43
44#define atomic_add(i, v)                atomic_add_return((i), (v))
45#define atomic_sub(i, v)                atomic_sub_return((i), (v))
46#define atomic_inc_return(v)            atomic_add_return(1, (v))
47#define atomic_add_negative(i, v)       (atomic_add_return((i), (v)) < 0)
48#define atomic_sub_and_test(i, v)       (atomic_sub_return((i), (v)) == 0)
49#define atomic_dec_and_test(v)          (atomic_sub_return(1, (v)) == 0)
50#define atomic_inc_and_test(v)          (atomic_add_return(1, (v)) == 0)
51#define atomic_dec_return(v)             atomic_sub_return(1, (v))
52
53static inline int
54atomic_add_return(int i, atomic_t *v)
55{
56        return i + atomic_fetchadd_int(&v->counter, i);
57}
58
59static inline int
60atomic_sub_return(int i, atomic_t *v)
61{
62        return atomic_fetchadd_int(&v->counter, -i) - i;
63}
64
65static inline void
66atomic_set(atomic_t *v, int i)
67{
68        atomic_store_rel_int(&v->counter, i);
69}
70
71static inline int
72atomic_read(atomic_t *v)
73{
74        return atomic_load_acq_int(&v->counter);
75}
76
77static inline int
78atomic_inc(atomic_t *v)
79{
80        return atomic_fetchadd_int(&v->counter, 1) + 1;
81}
82
83static inline int
84atomic_dec(atomic_t *v)
85{
86        return atomic_fetchadd_int(&v->counter, -1) - 1;
87}
88
89static inline int atomic_add_unless(atomic_t *v, int a, int u)
90{
91        int c, old;
92        c = atomic_read(v);
93        for (;;) {
94                if (unlikely(c == (u)))
95                        break;
96                old = atomic_cmpset_int(&v->counter, c, c + (a));
97                if (likely(old == c))
98                        break;
99                c = old;
100        }
101        return c != (u);
102}
103
104#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
105
106
107
108
109#endif  /* _ASM_ATOMIC_H_ */
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