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| 1110 | jermar | 1 | /* |
| 2 | * Copyright (C) 2005 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 __ia64_ATOMIC_H__ |
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| 30 | #define __ia64_ATOMIC_H__ |
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| 31 | |||
| 32 | /** Atomic addition. |
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| 33 | * |
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| 34 | * @param val Atomic value. |
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| 35 | * @param imm Value to add. |
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| 36 | * |
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| 37 | * @return Value before addition. |
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| 38 | */ |
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| 39 | static inline long atomic_add(atomic_t *val, int imm) |
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| 40 | { |
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| 41 | long v; |
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| 42 | |||
| 43 | __asm__ volatile ("fetchadd8.rel %0 = %1, %2\n" : "=r" (v), "+m" (val->count) : "i" (imm)); |
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| 44 | |||
| 45 | return v; |
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| 46 | } |
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| 47 | |||
| 48 | static inline void atomic_inc(atomic_t *val) { atomic_add(val, 1); } |
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| 49 | static inline void atomic_dec(atomic_t *val) { atomic_add(val, -1); } |
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| 50 | |||
| 51 | static inline long atomic_preinc(atomic_t *val) { return atomic_add(val, 1) + 1; } |
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| 52 | static inline long atomic_predec(atomic_t *val) { return atomic_add(val, -1) - 1; } |
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| 53 | |||
| 54 | static inline long atomic_postinc(atomic_t *val) { return atomic_add(val, 1); } |
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| 55 | static inline long atomic_postdec(atomic_t *val) { return atomic_add(val, -1); } |
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| 56 | |||
| 57 | #endif |