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| 1217 | decky | 1 | /* |
| 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 | |||
| 29 | #ifndef __ppc32_ATOMIC_H__ |
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| 30 | #define __ppc32_ATOMIC_H__ |
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| 31 | |||
| 32 | static inline void atomic_inc(atomic_t *val) |
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| 33 | { |
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| 34 | long tmp; |
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| 35 | |||
| 36 | asm __volatile__ ( |
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| 37 | "1:\n" |
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| 38 | "lwarx %0, 0, %2\n" |
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| 39 | "addic %0, %0, 1\n" |
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| 40 | "stwcx. %0, 0, %2\n" |
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| 41 | "bne- 1b" |
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| 42 | : "=&r" (tmp), "=m" (val->count) |
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| 43 | : "r" (&val->count), "m" (val->count) |
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| 44 | : "cc"); |
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| 45 | } |
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| 46 | |||
| 47 | static inline void atomic_dec(atomic_t *val) |
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| 48 | { |
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| 49 | long tmp; |
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| 50 | |||
| 51 | asm __volatile__( |
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| 52 | "1:\n" |
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| 53 | "lwarx %0, 0, %2\n" |
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| 54 | "addic %0, %0, -1\n" |
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| 55 | "stwcx. %0, 0, %2\n" |
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| 56 | "bne- 1b" |
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| 57 | : "=&r" (tmp), "=m" (val->count) |
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| 58 | : "r" (&val->count), "m" (val->count) |
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| 59 | : "cc"); |
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| 60 | } |
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| 61 | |||
| 62 | static inline long atomic_postinc(atomic_t *val) |
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| 63 | { |
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| 64 | atomic_inc(val); |
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| 65 | return val->count - 1; |
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| 66 | } |
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| 67 | |||
| 68 | static inline long atomic_postdec(atomic_t *val) |
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| 69 | { |
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| 70 | atomic_dec(val); |
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| 71 | return val->count + 1; |
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| 72 | } |
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| 73 | |||
| 74 | static inline long atomic_preinc(atomic_t *val) |
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| 75 | { |
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| 76 | atomic_inc(val); |
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| 77 | return val->count; |
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| 78 | } |
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| 79 | |||
| 80 | static inline long atomic_predec(atomic_t *val) |
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| 81 | { |
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| 82 | atomic_dec(val); |
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| 83 | return val->count; |
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| 84 | } |
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| 85 | |||
| 86 | #endif |