Subversion Repositories HelenOS-historic

Rev

Rev 1104 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
418 jermar 1
/*
2
 * Copyright (C) 2005 Jakub Jermar
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
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
1702 cejka 29
 /** @addtogroup sparc64   
30
 * @{
31
 */
32
/** @file
33
 */
34
 
418 jermar 35
#ifndef __sparc64_ATOMIC_H__
36
#define __sparc64_ATOMIC_H__
37
 
475 jermar 38
#include <arch/types.h>
1104 jermar 39
#include <typedefs.h>
475 jermar 40
 
861 jermar 41
/** Atomic add operation.
42
 *
43
 * Use atomic compare and swap operation to atomically add signed value.
44
 *
45
 * @param val Atomic variable.
46
 * @param i Signed value to be added.
47
 *
48
 * @return Value of the atomic variable as it existed before addition.
418 jermar 49
 */
1104 jermar 50
static inline long atomic_add(atomic_t *val, int i)
861 jermar 51
{
52
    __u64 a, b;
53
    volatile __u64 x = (__u64) &val->count;
418 jermar 54
 
861 jermar 55
    __asm__ volatile (
56
        "0:\n"
57
        "ldx %0, %1\n"
58
        "add %1, %3, %2\n"
59
        "casx %0, %1, %2\n"
60
        "cmp %1, %2\n"
863 jermar 61
        "bne 0b\n"      /* The operation failed and must be attempted again if a != b. */
861 jermar 62
        "nop\n"
63
        : "=m" (*((__u64 *)x)), "=r" (a), "=r" (b)
64
        : "r" (i)
65
    );
66
 
67
    return a;
68
}
69
 
1104 jermar 70
static inline long atomic_preinc(atomic_t *val)
1024 jermar 71
{
72
    return atomic_add(val, 1) + 1;
73
}
74
 
1104 jermar 75
static inline long atomic_postinc(atomic_t *val)
1024 jermar 76
{
77
    return atomic_add(val, 1);
78
}
79
 
1104 jermar 80
static inline long atomic_predec(atomic_t *val)
1024 jermar 81
{
82
    return atomic_add(val, -1) - 1;
83
}
84
 
1104 jermar 85
static inline long atomic_postdec(atomic_t *val)
1024 jermar 86
{
1082 jermar 87
    return atomic_add(val, -1);
1024 jermar 88
}
89
 
627 jermar 90
static inline void atomic_inc(atomic_t *val)
91
{
861 jermar 92
    (void) atomic_add(val, 1);
418 jermar 93
}
94
 
627 jermar 95
static inline void atomic_dec(atomic_t *val)
96
{
861 jermar 97
    (void) atomic_add(val, -1);
418 jermar 98
}
99
 
100
#endif
1702 cejka 101
 
102
 /** @}
103
 */
104