Subversion Repositories HelenOS

Rev

Rev 2082 | Rev 3107 | 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) 2005 Ondrej Palkovsky
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
 
1769 jermar 29
/** @addtogroup mips32 
1702 cejka 30
 * @{
31
 */
32
/** @file
33
 */
34
 
1888 jermar 35
#ifndef KERN_mips32_ATOMIC_H_
36
#define KERN_mips32_ATOMIC_H_
1 jermar 37
 
483 jermar 38
#define atomic_inc(x)   ((void) atomic_add(x, 1))
39
#define atomic_dec(x)   ((void) atomic_add(x, -1))
1 jermar 40
 
1024 jermar 41
#define atomic_postinc(x) (atomic_add(x, 1) - 1)
42
#define atomic_postdec(x) (atomic_add(x, -1) + 1)
477 vana 43
 
1024 jermar 44
#define atomic_preinc(x) atomic_add(x, 1)
45
#define atomic_predec(x) atomic_add(x, -1)
477 vana 46
 
483 jermar 47
/* Atomic addition of immediate value.
111 palkovsky 48
 *
483 jermar 49
 * @param val Memory location to which will be the immediate value added.
50
 * @param i Signed immediate that will be added to *val.
51
 *
52
 * @return Value after addition.
111 palkovsky 53
 */
1104 jermar 54
static inline long atomic_add(atomic_t *val, int i)
111 palkovsky 55
{
1104 jermar 56
    long tmp, v;
111 palkovsky 57
 
2082 decky 58
    asm volatile (
111 palkovsky 59
        "1:\n"
483 jermar 60
        "   ll %0, %1\n"
61
        "   addiu %0, %0, %3\n" /* same as addi, but never traps on overflow */
62
        "       move %2, %0\n"
63
        "   sc %0, %1\n"
64
        "   beq %0, %4, 1b\n"   /* if the atomic operation failed, try again */
1769 jermar 65
        "   nop\n"
625 palkovsky 66
        : "=r" (tmp), "=m" (val->count), "=r" (v)
483 jermar 67
        : "i" (i), "i" (0)
111 palkovsky 68
        );
69
 
483 jermar 70
    return v;
111 palkovsky 71
}
72
 
1 jermar 73
#endif
1702 cejka 74
 
1769 jermar 75
/** @}
1702 cejka 76
 */