Subversion Repositories HelenOS-historic

Rev

Rev 534 | Rev 627 | 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
 
475 jermar 34
typedef volatile __u32 atomic_t;
35
 
36
static inline void atomic_inc(atomic_t *val) {
458 decky 37
#ifdef CONFIG_SMP
481 vana 38
    __asm__ volatile ("lock incl %0\n" : "=m" (*val));
115 jermar 39
#else
481 vana 40
    __asm__ volatile ("incl %0\n" : "=m" (*val));
458 decky 41
#endif /* CONFIG_SMP */
115 jermar 42
}
1 jermar 43
 
475 jermar 44
static inline void atomic_dec(atomic_t *val) {
458 decky 45
#ifdef CONFIG_SMP
481 vana 46
    __asm__ volatile ("lock decl %0\n" : "=m" (*val));
115 jermar 47
#else
481 vana 48
    __asm__ volatile ("decl %0\n" : "=m" (*val));
458 decky 49
#endif /* CONFIG_SMP */
115 jermar 50
}
51
 
477 vana 52
static inline atomic_t atomic_inc_pre(atomic_t *val)
53
{
54
    atomic_t r;
55
    __asm__ volatile (
557 jermar 56
        "movl $1, %0\n"
57
        "lock xaddl %0, %1\n"
481 vana 58
        : "=r"(r), "=m" (*val)
477 vana 59
    );
60
    return r;
61
}
62
 
63
 
64
 
65
static inline atomic_t atomic_dec_pre(atomic_t *val)
66
{
67
    atomic_t r;
68
    __asm__ volatile (
557 jermar 69
        "movl $-1, %0\n"
70
        "lock xaddl %0, %1\n"
481 vana 71
        : "=r"(r), "=m" (*val)
477 vana 72
    );
73
    return r;
74
}
75
 
76
#define atomic_inc_post(val) (atomic_inc_pre(val)+1)
77
#define atomic_dec_post(val) (atomic_dec_pre(val)-1)
78
 
116 jermar 79
static inline int test_and_set(volatile int *val) {
115 jermar 80
    int v;
81
 
82
    __asm__ volatile (
83
        "movl $1, %0\n"
259 palkovsky 84
        "xchgl %0, %1\n"
481 vana 85
        : "=r" (v),"=m" (*val)
115 jermar 86
    );
87
 
88
    return v;
89
}
90
 
91
 
116 jermar 92
extern void spinlock_arch(volatile int *val);
1 jermar 93
 
94
#endif