Subversion Repositories HelenOS-historic

Rev

Rev 631 | Rev 1024 | 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
 
633 palkovsky 34
typedef struct { volatile __u32 count; } atomic_t;
475 jermar 35
 
633 palkovsky 36
static inline void atomic_set(atomic_t *val, __u32 i)
625 palkovsky 37
{
38
    val->count = i;
39
}
40
 
633 palkovsky 41
static inline __u32 atomic_get(atomic_t *val)
625 palkovsky 42
{
43
    return val->count;
44
}
45
 
475 jermar 46
static inline void atomic_inc(atomic_t *val) {
458 decky 47
#ifdef CONFIG_SMP
625 palkovsky 48
    __asm__ volatile ("lock incl %0\n" : "=m" (val->count));
115 jermar 49
#else
625 palkovsky 50
    __asm__ volatile ("incl %0\n" : "=m" (val->count));
458 decky 51
#endif /* CONFIG_SMP */
115 jermar 52
}
1 jermar 53
 
475 jermar 54
static inline void atomic_dec(atomic_t *val) {
458 decky 55
#ifdef CONFIG_SMP
625 palkovsky 56
    __asm__ volatile ("lock decl %0\n" : "=m" (val->count));
115 jermar 57
#else
625 palkovsky 58
    __asm__ volatile ("decl %0\n" : "=m" (val->count));
458 decky 59
#endif /* CONFIG_SMP */
115 jermar 60
}
61
 
627 jermar 62
static inline count_t atomic_inc_pre(atomic_t *val)
477 vana 63
{
627 jermar 64
    count_t r;
65
 
477 vana 66
    __asm__ volatile (
557 jermar 67
        "movl $1, %0\n"
68
        "lock xaddl %0, %1\n"
627 jermar 69
        : "=r" (r), "=m" (val->count)
477 vana 70
    );
627 jermar 71
 
477 vana 72
    return r;
73
}
74
 
627 jermar 75
static inline count_t atomic_dec_pre(atomic_t *val)
477 vana 76
{
627 jermar 77
    count_t r;
78
 
477 vana 79
    __asm__ volatile (
557 jermar 80
        "movl $-1, %0\n"
81
        "lock xaddl %0, %1\n"
631 palkovsky 82
        : "=r" (r), "=m" (val->count)
477 vana 83
    );
627 jermar 84
 
477 vana 85
    return r;
86
}
87
 
88
#define atomic_inc_post(val) (atomic_inc_pre(val)+1)
89
#define atomic_dec_post(val) (atomic_dec_pre(val)-1)
90
 
633 palkovsky 91
static inline __u32 test_and_set(atomic_t *val) {
92
    __u32 v;
115 jermar 93
 
94
    __asm__ volatile (
95
        "movl $1, %0\n"
259 palkovsky 96
        "xchgl %0, %1\n"
625 palkovsky 97
        : "=r" (v),"=m" (val->count)
115 jermar 98
    );
99
 
100
    return v;
101
}
102
 
103
 
116 jermar 104
extern void spinlock_arch(volatile int *val);
1 jermar 105
 
106
#endif