Subversion Repositories HelenOS

Rev

Rev 3343 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
633 palkovsky 1
/*
2071 jermar 2
 * Copyright (c) 2001-2004 Jakub Jermar
633 palkovsky 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 amd64  
1702 cejka 30
 * @{
31
 */
32
/** @file
33
 */
34
 
1888 jermar 35
#ifndef KERN_amd64_ATOMIC_H_
36
#define KERN_amd64_ATOMIC_H_
633 palkovsky 37
 
38
#include <arch/types.h>
1100 palkovsky 39
#include <arch/barrier.h>
40
#include <preemption.h>
633 palkovsky 41
 
42
static inline void atomic_inc(atomic_t *val) {
43
#ifdef CONFIG_SMP
3163 jermar 44
    asm volatile ("lock incq %0\n" : "+m" (val->count));
633 palkovsky 45
#else
3163 jermar 46
    asm volatile ("incq %0\n" : "+m" (val->count));
633 palkovsky 47
#endif /* CONFIG_SMP */
48
}
49
 
50
static inline void atomic_dec(atomic_t *val) {
51
#ifdef CONFIG_SMP
3163 jermar 52
    asm volatile ("lock decq %0\n" : "+m" (val->count));
633 palkovsky 53
#else
3163 jermar 54
    asm volatile ("decq %0\n" : "+m" (val->count));
633 palkovsky 55
#endif /* CONFIG_SMP */
56
}
57
 
1104 jermar 58
static inline long atomic_postinc(atomic_t *val)
633 palkovsky 59
{
1692 palkovsky 60
    long r = 1;
633 palkovsky 61
 
2082 decky 62
    asm volatile (
1692 palkovsky 63
        "lock xaddq %1, %0\n"
3163 jermar 64
        : "+m" (val->count), "+r" (r)
633 palkovsky 65
    );
66
 
67
    return r;
68
}
69
 
1104 jermar 70
static inline long atomic_postdec(atomic_t *val)
633 palkovsky 71
{
1692 palkovsky 72
    long r = -1;
633 palkovsky 73
 
2082 decky 74
    asm volatile (
1692 palkovsky 75
        "lock xaddq %1, %0\n"
3163 jermar 76
        : "+m" (val->count), "+r" (r)
633 palkovsky 77
    );
78
 
79
    return r;
80
}
81
 
3163 jermar 82
#define atomic_preinc(val) (atomic_postinc(val) + 1)
83
#define atomic_predec(val) (atomic_postdec(val) - 1)
633 palkovsky 84
 
1780 jermar 85
static inline uint64_t test_and_set(atomic_t *val) {
86
    uint64_t v;
633 palkovsky 87
 
2082 decky 88
    asm volatile (
633 palkovsky 89
        "movq $1, %0\n"
90
        "xchgq %0, %1\n"
3163 jermar 91
        : "=r" (v), "+m" (val->count)
633 palkovsky 92
    );
93
 
94
    return v;
95
}
96
 
97
 
1104 jermar 98
/** amd64 specific fast spinlock */
1100 palkovsky 99
static inline void atomic_lock_arch(atomic_t *val)
100
{
1780 jermar 101
    uint64_t tmp;
633 palkovsky 102
 
1100 palkovsky 103
    preemption_disable();
2082 decky 104
    asm volatile (
3163 jermar 105
        "0:\n"
1100 palkovsky 106
#ifdef CONFIG_HT
3163 jermar 107
        "pause\n"
633 palkovsky 108
#endif
3163 jermar 109
        "mov %0, %1\n"
110
        "testq %1, %1\n"
3397 rimsky 111
        "jnz 0b\n"       /* lightweight looping on locked spinlock */
1100 palkovsky 112
 
3163 jermar 113
        "incq %1\n"      /* now use the atomic operation */
114
        "xchgq %0, %1\n"
115
        "testq %1, %1\n"
116
        "jnz 0b\n"
3397 rimsky 117
                : "+m" (val->count), "=&r" (tmp)
3163 jermar 118
    );
1100 palkovsky 119
    /*
120
     * Prevent critical section code from bleeding out this way up.
121
     */
122
    CS_ENTER_BARRIER();
123
}
124
 
125
#endif
1702 cejka 126
 
1888 jermar 127
/** @}
1702 cejka 128
 */