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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 | |||
| 475 | jermar | 34 | typedef volatile __u32 atomic_t; |
| 35 | |||
| 36 | static inline void atomic_inc(atomic_t *val) { |
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| 458 | decky | 37 | #ifdef CONFIG_SMP |
| 481 | vana | 38 | __asm__ volatile ("lock incl %0\n" : "=m" (*val)); |
| 115 | jermar | 39 | #else |
| 481 | vana | 40 | __asm__ volatile ("incl %0\n" : "=m" (*val)); |
| 458 | decky | 41 | #endif /* CONFIG_SMP */ |
| 115 | jermar | 42 | } |
| 1 | jermar | 43 | |
| 475 | jermar | 44 | static inline void atomic_dec(atomic_t *val) { |
| 458 | decky | 45 | #ifdef CONFIG_SMP |
| 481 | vana | 46 | __asm__ volatile ("lock decl %0\n" : "=m" (*val)); |
| 115 | jermar | 47 | #else |
| 481 | vana | 48 | __asm__ volatile ("decl %0\n" : "=m" (*val)); |
| 458 | decky | 49 | #endif /* CONFIG_SMP */ |
| 115 | jermar | 50 | } |
| 51 | |||
| 477 | vana | 52 | static inline atomic_t atomic_inc_pre(atomic_t *val) |
| 53 | { |
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| 54 | atomic_t r; |
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| 55 | __asm__ volatile ( |
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| 557 | jermar | 56 | "movl $1, %0\n" |
| 57 | "lock xaddl %0, %1\n" |
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| 481 | vana | 58 | : "=r"(r), "=m" (*val) |
| 477 | vana | 59 | ); |
| 60 | return r; |
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| 61 | } |
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| 62 | |||
| 63 | |||
| 64 | |||
| 65 | static inline atomic_t atomic_dec_pre(atomic_t *val) |
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| 66 | { |
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| 67 | atomic_t r; |
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| 68 | __asm__ volatile ( |
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| 557 | jermar | 69 | "movl $-1, %0\n" |
| 70 | "lock xaddl %0, %1\n" |
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| 481 | vana | 71 | : "=r"(r), "=m" (*val) |
| 477 | vana | 72 | ); |
| 73 | return r; |
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| 74 | } |
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| 75 | |||
| 76 | #define atomic_inc_post(val) (atomic_inc_pre(val)+1) |
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| 77 | #define atomic_dec_post(val) (atomic_dec_pre(val)-1) |
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| 78 | |||
| 116 | jermar | 79 | static inline int test_and_set(volatile int *val) { |
| 115 | jermar | 80 | int v; |
| 81 | |||
| 82 | __asm__ volatile ( |
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| 83 | "movl $1, %0\n" |
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| 259 | palkovsky | 84 | "xchgl %0, %1\n" |
| 481 | vana | 85 | : "=r" (v),"=m" (*val) |
| 115 | jermar | 86 | ); |
| 87 | |||
| 88 | return v; |
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| 89 | } |
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| 90 | |||
| 91 | |||
| 116 | jermar | 92 | extern void spinlock_arch(volatile int *val); |
| 1 | jermar | 93 | |
| 94 | #endif |