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| 1 | 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 | |||
| 11 | jermar | 29 | #ifndef __ia32_ATOMIC_H__ |
| 30 | #define __ia32_ATOMIC_H__ |
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| 1 | jermar | 31 | |
| 32 | #include <arch/types.h> |
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| 33 | |||
| 115 | jermar | 34 | static inline void atomic_inc(volatile int *val) { |
| 35 | #ifdef __SMP__ |
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| 36 | __asm__ volatile ("lock incl (%0)\n" : : "r" (val)); |
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| 37 | #else |
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| 38 | __asm__ volatile ("incl (%0)\n" : : "r" (val)); |
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| 39 | #endif /* __SMP__ */ |
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| 40 | } |
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| 1 | jermar | 41 | |
| 115 | jermar | 42 | static inline void atomic_dec(volatile int *val) { |
| 43 | #ifdef __SMP__ |
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| 44 | __asm__ volatile ("lock decl (%0)\n" : : "r" (val)); |
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| 45 | #else |
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| 46 | __asm__ volatile ("decl (%0)\n" : : "r" (val)); |
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| 47 | #endif /* __SMP__ */ |
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| 48 | } |
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| 49 | |||
| 50 | static inline int test_and_set(int *val) { |
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| 51 | int v; |
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| 52 | |||
| 53 | __asm__ volatile ( |
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| 54 | "movl $1, %0\n" |
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| 55 | "xchgl %0, (%1)\n" |
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| 56 | : "=r" (v) |
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| 57 | : "r" (val) |
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| 58 | ); |
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| 59 | |||
| 60 | return v; |
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| 61 | } |
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| 62 | |||
| 63 | |||
| 1 | jermar | 64 | extern void spinlock_arch(int *val); |
| 65 | |||
| 66 | #endif |