Subversion Repositories HelenOS

Rev

Rev 2082 | Rev 3039 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1110 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2005 Ondrej Palkovsky
1110 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
 
1866 jermar 29
/** @addtogroup libcmips32 
1656 cejka 30
 * @{
31
 */
32
/** @file
1657 cejka 33
 * @ingroup libcmips32eb   
1656 cejka 34
 */
35
 
1866 jermar 36
#ifndef LIBC_mips32_ATOMIC_H_
37
#define LIBC_mips32_ATOMIC_H_
1110 jermar 38
 
39
#define atomic_inc(x)   ((void) atomic_add(x, 1))
40
#define atomic_dec(x)   ((void) atomic_add(x, -1))
41
 
42
#define atomic_postinc(x) (atomic_add(x, 1) - 1)
43
#define atomic_postdec(x) (atomic_add(x, -1) + 1)
44
 
45
#define atomic_preinc(x) atomic_add(x, 1)
46
#define atomic_predec(x) atomic_add(x, -1)
47
 
48
/* Atomic addition of immediate value.
49
 *
50
 * @param val Memory location to which will be the immediate value added.
51
 * @param i Signed immediate that will be added to *val.
52
 *
53
 * @return Value after addition.
54
 */
55
static inline long atomic_add(atomic_t *val, int i)
56
{
57
    long tmp, v;
58
 
2082 decky 59
    asm volatile (
1110 jermar 60
        "1:\n"
61
        "   ll %0, %1\n"
62
        "   addiu %0, %0, %3\n" /* same as addi, but never traps on overflow */
63
        "       move %2, %0\n"
64
        "   sc %0, %1\n"
65
        "   beq %0, %4, 1b\n"   /* if the atomic operation failed, try again */
66
        /*  nop */      /* nop is inserted automatically by compiler */
67
        : "=r" (tmp), "=m" (val->count), "=r" (v)
68
        : "i" (i), "i" (0)
69
        );
70
 
71
    return v;
72
}
73
 
74
#endif
1656 cejka 75
 
1866 jermar 76
/** @}
1656 cejka 77
 */