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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 | |||
29 | /** @addtogroup arm32 |
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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 | |||
35 | #ifndef KERN_arm32_ATOMIC_H_ |
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36 | #define KERN_arm32_ATOMIC_H_ |
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37 | |||
38 | #define atomic_inc(x) ((void) atomic_add(x, 1)) |
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39 | #define atomic_dec(x) ((void) atomic_add(x, -1)) |
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40 | |||
41 | #define atomic_postinc(x) (atomic_add(x, 1) - 1) |
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42 | #define atomic_postdec(x) (atomic_add(x, -1) + 1) |
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43 | |||
44 | #define atomic_preinc(x) atomic_add(x, 1) |
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45 | #define atomic_predec(x) atomic_add(x, -1) |
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46 | |||
47 | /* Atomic addition of immediate value. |
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48 | * |
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49 | * @param val Memory location to which will be the immediate value added. |
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50 | * @param i Signed immediate that will be added to *val. |
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51 | * |
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52 | * @return Value after addition. |
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53 | */ |
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54 | static inline long atomic_add(atomic_t *val, int i) |
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55 | { |
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2174 | kebrt | 56 | int ret; |
57 | volatile long * mem = &(val->count); |
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58 | |||
59 | asm volatile ( |
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2195 | kebrt | 60 | "1: \n" |
61 | "ldr r2, [%1] \n" |
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62 | "add r3, r2, %2 \n" |
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63 | "str r3, %0 \n" |
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64 | "swp r3, r3, [%1] \n" |
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65 | "cmp r3, r2 \n" |
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66 | "bne 1b \n" |
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2174 | kebrt | 67 | |
68 | : "=m" (ret) |
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69 | : "r" (mem), "r" (i) |
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70 | : "r3", "r2" |
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71 | ); |
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72 | |||
73 | return ret; |
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2195 | kebrt | 74 | } |
2128 | jermar | 75 | |
76 | #endif |
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77 | |||
78 | /** @} |
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79 | */ |