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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 | |||
342 | jermar | 29 | #ifndef __ppc32_ATOMIC_H__ |
30 | #define __ppc32_ATOMIC_H__ |
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156 | decky | 31 | |
1001 | decky | 32 | static inline void atomic_inc(atomic_t *val) |
33 | { |
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1107 | jermar | 34 | long tmp; |
156 | decky | 35 | |
1267 | decky | 36 | asm volatile ( |
990 | decky | 37 | "1:\n" |
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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1267 | decky | 44 | : "cc" |
45 | ); |
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156 | decky | 46 | } |
47 | |||
1001 | decky | 48 | static inline void atomic_dec(atomic_t *val) |
49 | { |
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1107 | jermar | 50 | long tmp; |
990 | decky | 51 | |
1267 | decky | 52 | asm volatile ( |
990 | decky | 53 | "1:\n" |
54 | "lwarx %0, 0, %2\n" |
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55 | "addic %0, %0, -1\n" |
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56 | "stwcx. %0, 0, %2\n" |
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57 | "bne- 1b" |
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58 | : "=&r" (tmp), "=m" (val->count) |
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59 | : "r" (&val->count), "m" (val->count) |
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1267 | decky | 60 | : "cc" |
61 | ); |
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156 | decky | 62 | } |
63 | |||
1104 | jermar | 64 | static inline long atomic_postinc(atomic_t *val) |
1001 | decky | 65 | { |
66 | atomic_inc(val); |
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67 | return val->count - 1; |
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68 | } |
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69 | |||
1104 | jermar | 70 | static inline long atomic_postdec(atomic_t *val) |
1001 | decky | 71 | { |
72 | atomic_dec(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_preinc(atomic_t *val) |
1001 | decky | 77 | { |
78 | atomic_inc(val); |
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79 | return val->count; |
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80 | } |
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81 | |||
1104 | jermar | 82 | static inline long atomic_predec(atomic_t *val) |
1001 | decky | 83 | { |
84 | atomic_dec(val); |
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85 | return val->count; |
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86 | } |
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87 | |||
156 | decky | 88 | #endif |