Subversion Repositories HelenOS

Rev

Rev 3386 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
112 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2005 Jakub Jermar
112 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
 
1888 jermar 29
/** @addtogroup ia64   
1702 cejka 30
 * @{
31
 */
32
/** @file
33
 */
34
 
1888 jermar 35
#ifndef KERN_ia64_ATOMIC_H_
36
#define KERN_ia64_ATOMIC_H_
112 jermar 37
 
627 jermar 38
/** Atomic addition.
39
 *
4153 mejdrech 40
 * @param val       Atomic value.
41
 * @param imm       Value to add.
627 jermar 42
 *
4153 mejdrech 43
 * @return      Value before addition.
627 jermar 44
 */
1104 jermar 45
static inline long atomic_add(atomic_t *val, int imm)
475 jermar 46
{
1104 jermar 47
    long v;
475 jermar 48
 
4153 mejdrech 49
    asm volatile ("fetchadd8.rel %0 = %1, %2\n" : "=r" (v),
50
        "+m" (val->count) : "i" (imm));
477 vana 51
 
475 jermar 52
    return v;
112 jermar 53
}
54
 
475 jermar 55
 
4153 mejdrech 56
static inline uint64_t test_and_set(atomic_t *val) {
57
    uint64_t v;
58
 
59
    asm volatile (
60
        "movl %0 = 0x01;;\n"
61
        "xchg8 %0 = %1, %0;;\n"
62
        : "=r" (v), "+m" (val->count)
63
    );
64
 
65
    return v;
66
}
477 vana 67
 
68
 
4153 mejdrech 69
static inline void atomic_inc(atomic_t *val)
70
{
71
    atomic_add(val, 1);
72
}
73
 
74
static inline void atomic_dec(atomic_t *val)
75
{
76
    atomic_add(val, -1);
77
}
78
 
79
static inline long atomic_preinc(atomic_t *val)
80
{
81
    return atomic_add(val, 1) + 1;
82
}
83
 
84
static inline long atomic_predec(atomic_t *val)
85
{
86
    return atomic_add(val, -1) - 1;
87
}
88
 
89
static inline long atomic_postinc(atomic_t *val)
90
{
91
    return atomic_add(val, 1);
92
}
93
 
94
static inline long atomic_postdec(atomic_t *val)
95
{
96
    return atomic_add(val, -1);
97
}
98
 
112 jermar 99
#endif
1702 cejka 100
 
1888 jermar 101
/** @}
1702 cejka 102
 */