Subversion Repositories HelenOS

Rev

Rev 2071 | Rev 2089 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
418 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2005 Jakub Jermar
418 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
 
1784 jermar 29
/** @addtogroup sparc64
1702 cejka 30
 * @{
31
 */
32
/** @file
33
 */
34
 
1860 jermar 35
#ifndef KERN_sparc64_ATOMIC_H_
36
#define KERN_sparc64_ATOMIC_H_
418 jermar 37
 
1902 jermar 38
#include <arch/barrier.h>
475 jermar 39
#include <arch/types.h>
1104 jermar 40
#include <typedefs.h>
475 jermar 41
 
861 jermar 42
/** Atomic add operation.
43
 *
44
 * Use atomic compare and swap operation to atomically add signed value.
45
 *
46
 * @param val Atomic variable.
47
 * @param i Signed value to be added.
48
 *
49
 * @return Value of the atomic variable as it existed before addition.
418 jermar 50
 */
1104 jermar 51
static inline long atomic_add(atomic_t *val, int i)
861 jermar 52
{
1780 jermar 53
    uint64_t a, b;
418 jermar 54
 
1888 jermar 55
    do {
56
        volatile uintptr_t x = (uint64_t) &val->count;
861 jermar 57
 
1888 jermar 58
        a = *((uint64_t *) x);
59
        b = a + i;
2082 decky 60
        asm volatile ("casx %0, %2, %1\n" : "+m" (*((uint64_t *)x)), "+r" (b) : "r" (a));
1888 jermar 61
    } while (a != b);
62
 
861 jermar 63
    return a;
64
}
65
 
1104 jermar 66
static inline long atomic_preinc(atomic_t *val)
1024 jermar 67
{
68
    return atomic_add(val, 1) + 1;
69
}
70
 
1104 jermar 71
static inline long atomic_postinc(atomic_t *val)
1024 jermar 72
{
73
    return atomic_add(val, 1);
74
}
75
 
1104 jermar 76
static inline long atomic_predec(atomic_t *val)
1024 jermar 77
{
78
    return atomic_add(val, -1) - 1;
79
}
80
 
1104 jermar 81
static inline long atomic_postdec(atomic_t *val)
1024 jermar 82
{
1082 jermar 83
    return atomic_add(val, -1);
1024 jermar 84
}
85
 
627 jermar 86
static inline void atomic_inc(atomic_t *val)
87
{
861 jermar 88
    (void) atomic_add(val, 1);
418 jermar 89
}
90
 
627 jermar 91
static inline void atomic_dec(atomic_t *val)
92
{
861 jermar 93
    (void) atomic_add(val, -1);
418 jermar 94
}
95
 
1902 jermar 96
static inline long test_and_set(atomic_t *val)
97
{
98
    uint64_t v = 1;
1903 jermar 99
    volatile uintptr_t x = (uint64_t) &val->count;
1902 jermar 100
 
2082 decky 101
    asm volatile ("casx %0, %2, %1\n" : "+m" (*((uint64_t *) x)), "+r" (v) : "r" (0));
1902 jermar 102
 
103
    return v;
104
}
105
 
106
static inline void atomic_lock_arch(atomic_t *val)
107
{
108
    uint64_t tmp1 = 1;
109
    uint64_t tmp2;
110
 
1903 jermar 111
    volatile uintptr_t x = (uint64_t) &val->count;
112
 
2082 decky 113
    asm volatile (
1902 jermar 114
    "0:\n"
115
        "casx %0, %3, %1\n"
116
        "brz %1, 2f\n"
117
        "nop\n"
118
    "1:\n"
119
        "ldx %0, %2\n"
120
        "brz %2, 0b\n"
121
        "nop\n"
122
        "ba 1b\n"
123
        "nop\n"
124
    "2:\n"
1903 jermar 125
        : "+m" (*((uint64_t *) x)), "+r" (tmp1), "+r" (tmp2) : "r" (0)
1902 jermar 126
    );
127
 
128
    /*
129
     * Prevent critical section code from bleeding out this way up.
130
     */
131
    CS_ENTER_BARRIER();
132
}
133
 
418 jermar 134
#endif
1702 cejka 135
 
1784 jermar 136
/** @}
1702 cejka 137
 */