Subversion Repositories HelenOS

Rev

Rev 248 | Rev 458 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1 jermar 1
/*
2
 * Copyright (C) 2001-2004 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
 
11 jermar 29
#ifndef __ia32_ATOMIC_H__
30
#define __ia32_ATOMIC_H__
1 jermar 31
 
32
#include <arch/types.h>
33
 
248 jermar 34
static inline void atomic_inc(volatile int *val) {
115 jermar 35
#ifdef __SMP__
259 palkovsky 36
    __asm__ volatile ("lock incl %0\n" : "=m" (*val));
115 jermar 37
#else
259 palkovsky 38
    __asm__ volatile ("incl %0\n" : "=m" (*val));
115 jermar 39
#endif /* __SMP__ */
40
}
1 jermar 41
 
248 jermar 42
static inline void atomic_dec(volatile int *val) {
115 jermar 43
#ifdef __SMP__
259 palkovsky 44
    __asm__ volatile ("lock decl %0\n" : "=m" (*val));
115 jermar 45
#else
259 palkovsky 46
    __asm__ volatile ("decl %0\n" : "=m" (*val));
115 jermar 47
#endif /* __SMP__ */
48
}
49
 
116 jermar 50
static inline int test_and_set(volatile int *val) {
115 jermar 51
    int v;
52
 
53
    __asm__ volatile (
54
        "movl $1, %0\n"
259 palkovsky 55
        "xchgl %0, %1\n"
56
        : "=r" (v),"=m" (*val)
115 jermar 57
    );
58
 
59
    return v;
60
}
61
 
62
 
116 jermar 63
extern void spinlock_arch(volatile int *val);
1 jermar 64
 
65
#endif