Subversion Repositories HelenOS

Rev

Rev 2082 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1110 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2001-2004 Jakub Jermar
1110 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
 
1866 jermar 29
/** @addtogroup libcamd64 amd64
1656 cejka 30
 * @ingroup lc
31
 * @brief   amd64 architecture dependent parts of libc
32
 * @{
33
 */
34
/** @file
35
 */
36
 
1866 jermar 37
#ifndef LIBC_amd64_ATOMIC_H_
38
#define LIBC_amd64_ATOMIC_H_
1110 jermar 39
 
40
static inline void atomic_inc(atomic_t *val) {
2082 decky 41
    asm volatile ("lock incq %0\n" : "=m" (val->count));
1110 jermar 42
}
43
 
44
static inline void atomic_dec(atomic_t *val) {
2082 decky 45
    asm volatile ("lock decq %0\n" : "=m" (val->count));
1110 jermar 46
}
47
 
48
static inline long atomic_postinc(atomic_t *val)
49
{
50
    long r;
51
 
2082 decky 52
    asm volatile (
1110 jermar 53
        "movq $1, %0\n"
54
        "lock xaddq %0, %1\n"
55
        : "=r" (r), "=m" (val->count)
56
    );
57
 
58
    return r;
59
}
60
 
61
static inline long atomic_postdec(atomic_t *val)
62
{
63
    long r;
64
 
2082 decky 65
    asm volatile (
1110 jermar 66
        "movq $-1, %0\n"
67
        "lock xaddq %0, %1\n"
68
        : "=r" (r), "=m" (val->count)
69
    );
70
 
71
    return r;
72
}
73
 
74
#define atomic_preinc(val) (atomic_postinc(val)+1)
75
#define atomic_predec(val) (atomic_postdec(val)-1)
76
 
77
#endif
1656 cejka 78
 
1866 jermar 79
/** @}
1656 cejka 80
 */