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| Rev | Author | Line No. | Line |
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| 1217 | decky | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2005 Martin Decky |
| 1217 | decky | 3 | * All rights reserved. |
| 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 | |||
| 1866 | jermar | 29 | /** @addtogroup libcppc32 |
| 1656 | cejka | 30 | * @{ |
| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 1866 | jermar | 35 | #ifndef LIBC_ppc32_ATOMIC_H_ |
| 36 | #define LIBC_ppc32_ATOMIC_H_ |
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| 1217 | decky | 37 | |
| 38 | static inline void atomic_inc(atomic_t *val) |
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| 39 | { |
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| 40 | long tmp; |
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| 41 | |||
| 2082 | decky | 42 | asm volatile ( |
| 1217 | 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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| 50 | : "cc"); |
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| 51 | } |
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| 52 | |||
| 53 | static inline void atomic_dec(atomic_t *val) |
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| 54 | { |
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| 55 | long tmp; |
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| 56 | |||
| 2082 | decky | 57 | asm volatile ( |
| 1217 | decky | 58 | "1:\n" |
| 59 | "lwarx %0, 0, %2\n" |
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| 60 | "addic %0, %0, -1\n" |
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| 61 | "stwcx. %0, 0, %2\n" |
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| 62 | "bne- 1b" |
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| 63 | : "=&r" (tmp), "=m" (val->count) |
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| 64 | : "r" (&val->count), "m" (val->count) |
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| 65 | : "cc"); |
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| 66 | } |
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| 67 | |||
| 68 | static inline long atomic_postinc(atomic_t *val) |
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| 69 | { |
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| 70 | atomic_inc(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_postdec(atomic_t *val) |
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| 75 | { |
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| 76 | atomic_dec(val); |
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| 77 | return val->count + 1; |
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| 78 | } |
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| 79 | |||
| 80 | static inline long atomic_preinc(atomic_t *val) |
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| 81 | { |
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| 82 | atomic_inc(val); |
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| 83 | return val->count; |
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| 84 | } |
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| 85 | |||
| 86 | static inline long atomic_predec(atomic_t *val) |
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| 87 | { |
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| 88 | atomic_dec(val); |
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| 89 | return val->count; |
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| 90 | } |
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| 91 | |||
| 92 | #endif |
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| 1656 | cejka | 93 | |
| 1866 | jermar | 94 | /** @} |
| 1656 | cejka | 95 | */ |