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| Rev | Author | Line No. | Line |
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| 2128 | jermar | 1 | /* |
| 2174 | kebrt | 2 | * Copyright (c) 2007 Michal Kebrt |
| 2128 | jermar | 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 | |||
| 2313 | kebrt | 29 | /** @addtogroup libcarm32 |
| 2128 | jermar | 30 | * @{ |
| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 35 | #ifndef KERN_arm32_ATOMIC_H_ |
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| 36 | #define KERN_arm32_ATOMIC_H_ |
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| 37 | |||
| 2313 | kebrt | 38 | /** Atomic addition. |
| 2128 | jermar | 39 | * |
| 2313 | kebrt | 40 | * @param val "Atomic variable". |
| 41 | * @param i Value to add. |
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| 2128 | jermar | 42 | * |
| 43 | * @return Value after addition. |
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| 44 | */ |
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| 45 | static inline long atomic_add(atomic_t *val, int i) |
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| 46 | { |
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| 2174 | kebrt | 47 | int ret; |
| 48 | volatile long * mem = &(val->count); |
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| 49 | |||
| 50 | asm volatile ( |
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| 2195 | kebrt | 51 | "1: \n" |
| 52 | "ldr r2, [%1] \n" |
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| 53 | "add r3, r2, %2 \n" |
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| 54 | "str r3, %0 \n" |
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| 55 | "swp r3, r3, [%1] \n" |
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| 56 | "cmp r3, r2 \n" |
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| 57 | "bne 1b \n" |
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| 2174 | kebrt | 58 | |
| 59 | : "=m" (ret) |
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| 60 | : "r" (mem), "r" (i) |
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| 61 | : "r3", "r2" |
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| 62 | ); |
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| 63 | |||
| 64 | return ret; |
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| 2313 | kebrt | 65 | } |
| 2128 | jermar | 66 | |
| 2313 | kebrt | 67 | static inline void atomic_inc(atomic_t *val) { atomic_add(val, 1); } |
| 68 | static inline void atomic_dec(atomic_t *val) { atomic_add(val, -1); } |
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| 69 | |||
| 70 | static inline long atomic_preinc(atomic_t *val) { return atomic_add(val, 1); } |
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| 71 | static inline long atomic_predec(atomic_t *val) { return atomic_add(val, -1); } |
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| 72 | |||
| 73 | static inline long atomic_postinc(atomic_t *val) { return atomic_add(val, 1) - 1; } |
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| 74 | static inline long atomic_postdec(atomic_t *val) { return atomic_add(val, -1) + 1; } |
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| 75 | |||
| 2128 | jermar | 76 | #endif |
| 77 | |||
| 78 | /** @} |
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| 79 | */ |