Subversion Repositories HelenOS

Rev

Rev 3386 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
112 jermar 1 
/*
2071 jermar 2 
 * Copyright (c) 2005 Jakub Jermar
112 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 ia64   
1702 cejka 30 
 * @{
31 
 */
32 
/** @file
33 
 */
34 
 
1888 jermar 35 
#ifndef KERN_ia64_ATOMIC_H_
36 
#define KERN_ia64_ATOMIC_H_
112 jermar 37 
 
627 jermar 38 
/** Atomic addition.
39 
 *
4153 mejdrech 40 
 * @param val       Atomic value.
41 
 * @param imm       Value to add.
627 jermar 42 
 *
4153 mejdrech 43 
 * @return      Value before addition.
627 jermar 44 
 */
1104 jermar 45 
static inline long atomic_add(atomic_t *val, int imm)
475 jermar 46 
{
1104 jermar 47 
    long v;
475 jermar 48 
 
4153 mejdrech 49 
    asm volatile ("fetchadd8.rel %0 = %1, %2\n" : "=r" (v),
50 
        "+m" (val->count) : "i" (imm));
477 vana 51 
 
475 jermar 52 
    return v;
112 jermar 53 
}
54 
 
475 jermar 55 
 
4153 mejdrech 56 
static inline uint64_t test_and_set(atomic_t *val) {
57 
    uint64_t v;
58 
 
59 
    asm volatile (
60 
        "movl %0 = 0x01;;\n"
61 
        "xchg8 %0 = %1, %0;;\n"
62 
        : "=r" (v), "+m" (val->count)
63 
    );
64 
 
65 
    return v;
66 
}
477 vana 67 
 
68 
 
4153 mejdrech 69 
static inline void atomic_inc(atomic_t *val)
70 
{
71 
    atomic_add(val, 1);
72 
}
73 
 
74 
static inline void atomic_dec(atomic_t *val)
75 
{
76 
    atomic_add(val, -1);
77 
}
78 
 
79 
static inline long atomic_preinc(atomic_t *val)
80 
{
81 
    return atomic_add(val, 1) + 1;
82 
}
83 
 
84 
static inline long atomic_predec(atomic_t *val)
85 
{
86 
    return atomic_add(val, -1) - 1;
87 
}
88 
 
89 
static inline long atomic_postinc(atomic_t *val)
90 
{
91 
    return atomic_add(val, 1);
92 
}
93 
 
94 
static inline long atomic_postdec(atomic_t *val)
95 
{
96 
    return atomic_add(val, -1);
97 
}
98 
 
112 jermar 99 
#endif
1702 cejka 100 
 
1888 jermar 101 
/** @}
1702 cejka 102 
 */