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| Rev | Author | Line No. | Line |
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| 156 | 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 | |||
| 1888 | jermar | 29 | /** @addtogroup ppc32 |
| 1702 | cejka | 30 | * @{ |
| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 1888 | jermar | 35 | #ifndef KERN_ppc32_ATOMIC_H_ |
| 36 | #define KERN_ppc32_ATOMIC_H_ |
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| 156 | decky | 37 | |
| 1001 | decky | 38 | static inline void atomic_inc(atomic_t *val) |
| 39 | { |
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| 1107 | jermar | 40 | long tmp; |
| 156 | decky | 41 | |
| 1267 | decky | 42 | asm volatile ( |
| 990 | decky | 43 | "1:\n" |
| 44 | "lwarx %0, 0, %2\n" |
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| 45 | "addic %0, %0, 1\n" |
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| 46 | "stwcx. %0, 0, %2\n" |
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| 47 | "bne- 1b" |
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| 48 | : "=&r" (tmp), "=m" (val->count) |
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| 49 | : "r" (&val->count), "m" (val->count) |
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| 1267 | decky | 50 | : "cc" |
| 51 | ); |
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| 156 | decky | 52 | } |
| 53 | |||
| 1001 | decky | 54 | static inline void atomic_dec(atomic_t *val) |
| 55 | { |
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| 1107 | jermar | 56 | long tmp; |
| 990 | decky | 57 | |
| 1267 | decky | 58 | asm volatile ( |
| 990 | decky | 59 | "1:\n" |
| 60 | "lwarx %0, 0, %2\n" |
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| 61 | "addic %0, %0, -1\n" |
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| 62 | "stwcx. %0, 0, %2\n" |
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| 63 | "bne- 1b" |
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| 64 | : "=&r" (tmp), "=m" (val->count) |
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| 65 | : "r" (&val->count), "m" (val->count) |
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| 1267 | decky | 66 | : "cc" |
| 67 | ); |
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| 156 | decky | 68 | } |
| 69 | |||
| 1104 | jermar | 70 | static inline long atomic_postinc(atomic_t *val) |
| 1001 | decky | 71 | { |
| 72 | atomic_inc(val); |
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| 73 | return val->count - 1; |
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| 74 | } |
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| 75 | |||
| 1104 | jermar | 76 | static inline long atomic_postdec(atomic_t *val) |
| 1001 | decky | 77 | { |
| 78 | atomic_dec(val); |
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| 79 | return val->count + 1; |
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| 80 | } |
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| 81 | |||
| 1104 | jermar | 82 | static inline long atomic_preinc(atomic_t *val) |
| 1001 | decky | 83 | { |
| 84 | atomic_inc(val); |
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| 85 | return val->count; |
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| 86 | } |
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| 87 | |||
| 1104 | jermar | 88 | static inline long atomic_predec(atomic_t *val) |
| 1001 | decky | 89 | { |
| 90 | atomic_dec(val); |
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| 91 | return val->count; |
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| 92 | } |
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| 93 | |||
| 156 | decky | 94 | #endif |
| 1702 | cejka | 95 | |
| 1888 | jermar | 96 | /** @} |
| 1702 | cejka | 97 | */ |