| 1 | /*
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| 2 | * Copyright (c) 2005 Martin Decky
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup libcppc32
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #ifndef LIBC_ppc32_ATOMIC_H_
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| 36 | #define LIBC_ppc32_ATOMIC_H_
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| 37 |
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| 38 | #define LIBC_ARCH_ATOMIC_H_
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| 39 |
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| 40 | #include <atomicdflt.h>
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| 41 |
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| 42 | static inline void atomic_inc(atomic_t *val)
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| 43 | {
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| 44 | atomic_count_t tmp;
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| 45 |
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| 46 | asm volatile (
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| 47 | "1:\n"
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| 48 | "lwarx %0, 0, %2\n"
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| 49 | "addic %0, %0, 1\n"
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| 50 | "stwcx. %0, 0, %2\n"
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| 51 | "bne- 1b"
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| 52 | : "=&r" (tmp),
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| 53 | "=m" (val->count)
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| 54 | : "r" (&val->count),
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| 55 | "m" (val->count)
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| 56 | : "cc"
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| 57 | );
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| 58 | }
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| 59 |
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| 60 | static inline void atomic_dec(atomic_t *val)
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| 61 | {
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| 62 | atomic_count_t tmp;
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| 63 |
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| 64 | asm volatile (
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| 65 | "1:\n"
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| 66 | "lwarx %0, 0, %2\n"
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| 67 | "addic %0, %0, -1\n"
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| 68 | "stwcx. %0, 0, %2\n"
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| 69 | "bne- 1b"
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| 70 | : "=&r" (tmp),
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| 71 | "=m" (val->count)
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| 72 | : "r" (&val->count),
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| 73 | "m" (val->count)
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| 74 | : "cc"
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| 75 | );
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| 76 | }
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| 77 |
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| 78 | static inline atomic_count_t atomic_postinc(atomic_t *val)
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| 79 | {
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| 80 | atomic_inc(val);
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| 81 | return val->count - 1;
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| 82 | }
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| 83 |
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| 84 | static inline atomic_count_t atomic_postdec(atomic_t *val)
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| 85 | {
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| 86 | atomic_dec(val);
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| 87 | return val->count + 1;
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| 88 | }
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| 89 |
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| 90 | static inline atomic_count_t atomic_preinc(atomic_t *val)
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| 91 | {
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| 92 | atomic_inc(val);
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| 93 | return val->count;
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| 94 | }
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| 95 |
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| 96 | static inline atomic_count_t atomic_predec(atomic_t *val)
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| 97 | {
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| 98 | atomic_dec(val);
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| 99 | return val->count;
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| 100 | }
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| 101 |
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| 102 | #endif
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| 103 |
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| 104 | /** @}
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| 105 | */
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