Subversion Repositories HelenOS

Rev

Rev 2082 | Rev 3381 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2001-2004 Jakub Jermar
1 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 ia32   
1702 cejka 30
 * @{
31
 */
32
/** @file
33
 */
34
 
1888 jermar 35
#ifndef KERN_ia32_ATOMIC_H_
36
#define KERN_ia32_ATOMIC_H_
1 jermar 37
 
38
#include <arch/types.h>
1100 palkovsky 39
#include <arch/barrier.h>
40
#include <preemption.h>
1 jermar 41
 
475 jermar 42
static inline void atomic_inc(atomic_t *val) {
458 decky 43
#ifdef CONFIG_SMP
2082 decky 44
    asm volatile ("lock incl %0\n" : "=m" (val->count));
115 jermar 45
#else
2082 decky 46
    asm volatile ("incl %0\n" : "=m" (val->count));
458 decky 47
#endif /* CONFIG_SMP */
115 jermar 48
}
1 jermar 49
 
475 jermar 50
static inline void atomic_dec(atomic_t *val) {
458 decky 51
#ifdef CONFIG_SMP
2082 decky 52
    asm volatile ("lock decl %0\n" : "=m" (val->count));
115 jermar 53
#else
2082 decky 54
    asm volatile ("decl %0\n" : "=m" (val->count));
458 decky 55
#endif /* CONFIG_SMP */
115 jermar 56
}
57
 
1104 jermar 58
static inline long atomic_postinc(atomic_t *val)
477 vana 59
{
1691 palkovsky 60
    long r = 1;
627 jermar 61
 
2082 decky 62
    asm volatile (
1691 palkovsky 63
        "lock xaddl %1, %0\n"
1697 palkovsky 64
        : "=m" (val->count), "+r" (r)
477 vana 65
    );
627 jermar 66
 
477 vana 67
    return r;
68
}
69
 
1104 jermar 70
static inline long atomic_postdec(atomic_t *val)
477 vana 71
{
1691 palkovsky 72
    long r = -1;
627 jermar 73
 
2082 decky 74
    asm volatile (
1691 palkovsky 75
        "lock xaddl %1, %0\n"
1697 palkovsky 76
        : "=m" (val->count), "+r"(r)
477 vana 77
    );
627 jermar 78
 
477 vana 79
    return r;
80
}
81
 
1024 jermar 82
#define atomic_preinc(val) (atomic_postinc(val)+1)
83
#define atomic_predec(val) (atomic_postdec(val)-1)
477 vana 84
 
1780 jermar 85
static inline uint32_t test_and_set(atomic_t *val) {
86
    uint32_t v;
115 jermar 87
 
2082 decky 88
    asm volatile (
115 jermar 89
        "movl $1, %0\n"
259 palkovsky 90
        "xchgl %0, %1\n"
625 palkovsky 91
        : "=r" (v),"=m" (val->count)
115 jermar 92
    );
93
 
94
    return v;
95
}
96
 
1104 jermar 97
/** ia32 specific fast spinlock */
1100 palkovsky 98
static inline void atomic_lock_arch(atomic_t *val)
99
{
1780 jermar 100
    uint32_t tmp;
115 jermar 101
 
1100 palkovsky 102
    preemption_disable();
2082 decky 103
    asm volatile (
1100 palkovsky 104
        "0:;"
105
#ifdef CONFIG_HT
106
        "pause;" /* Pentium 4's HT love this instruction */
107
#endif
108
        "mov %0, %1;"
109
        "testl %1, %1;"
1104 jermar 110
        "jnz 0b;"       /* Lightweight looping on locked spinlock */
1100 palkovsky 111
 
112
        "incl %1;"      /* now use the atomic operation */
113
        "xchgl %0, %1;"
114
        "testl %1, %1;"
115
        "jnz 0b;"
116
                : "=m"(val->count),"=r"(tmp)
117
        );
118
    /*
119
     * Prevent critical section code from bleeding out this way up.
120
     */
121
    CS_ENTER_BARRIER();
122
}
1 jermar 123
 
124
#endif
1702 cejka 125
 
1888 jermar 126
/** @}
1702 cejka 127
 */