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1110 | jermar | 1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
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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 | |||
29 | #ifndef __ia32_ATOMIC_H__ |
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30 | #define __ia32_ATOMIC_H__ |
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31 | |||
32 | static inline void atomic_inc(atomic_t *val) { |
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33 | __asm__ volatile ("lock incl %0\n" : "=m" (val->count)); |
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34 | } |
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35 | |||
36 | static inline void atomic_dec(atomic_t *val) { |
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37 | __asm__ volatile ("lock decl %0\n" : "=m" (val->count)); |
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38 | } |
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39 | |||
40 | static inline long atomic_postinc(atomic_t *val) |
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41 | { |
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42 | long r; |
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43 | |||
44 | __asm__ volatile ( |
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45 | "movl $1, %0\n" |
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46 | "lock xaddl %0, %1\n" |
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47 | : "=r" (r), "=m" (val->count) |
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48 | ); |
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49 | |||
50 | return r; |
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51 | } |
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52 | |||
53 | static inline long atomic_postdec(atomic_t *val) |
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54 | { |
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55 | long r; |
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56 | |||
57 | __asm__ volatile ( |
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58 | "movl $-1, %0\n" |
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59 | "lock xaddl %0, %1\n" |
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60 | : "=r" (r), "=m" (val->count) |
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61 | ); |
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62 | |||
63 | return r; |
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64 | } |
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65 | |||
66 | #define atomic_preinc(val) (atomic_postinc(val)+1) |
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67 | #define atomic_predec(val) (atomic_postdec(val)-1) |
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68 | |||
69 | #endif |