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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 | |||
| 625 | palkovsky | 34 | typedef struct { volatile __u32 count; } atomic_t; |
| 475 | jermar | 35 | |
| 625 | palkovsky | 36 | static inline void atomic_set(atomic_t *val, __u32 i) |
| 37 | { |
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| 38 | val->count = i; |
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| 39 | } |
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| 40 | |||
| 41 | static inline __u32 atomic_get(atomic_t *val) |
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| 42 | { |
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| 43 | return val->count; |
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| 44 | } |
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| 45 | |||
| 475 | jermar | 46 | static inline void atomic_inc(atomic_t *val) { |
| 458 | decky | 47 | #ifdef CONFIG_SMP |
| 625 | palkovsky | 48 | __asm__ volatile ("lock incl %0\n" : "=m" (val->count)); |
| 115 | jermar | 49 | #else |
| 625 | palkovsky | 50 | __asm__ volatile ("incl %0\n" : "=m" (val->count)); |
| 458 | decky | 51 | #endif /* CONFIG_SMP */ |
| 115 | jermar | 52 | } |
| 1 | jermar | 53 | |
| 475 | jermar | 54 | static inline void atomic_dec(atomic_t *val) { |
| 458 | decky | 55 | #ifdef CONFIG_SMP |
| 625 | palkovsky | 56 | __asm__ volatile ("lock decl %0\n" : "=m" (val->count)); |
| 115 | jermar | 57 | #else |
| 625 | palkovsky | 58 | __asm__ volatile ("decl %0\n" : "=m" (val->count)); |
| 458 | decky | 59 | #endif /* CONFIG_SMP */ |
| 115 | jermar | 60 | } |
| 61 | |||
| 627 | jermar | 62 | static inline count_t atomic_inc_pre(atomic_t *val) |
| 477 | vana | 63 | { |
| 627 | jermar | 64 | count_t r; |
| 65 | |||
| 477 | vana | 66 | __asm__ volatile ( |
| 557 | jermar | 67 | "movl $1, %0\n" |
| 68 | "lock xaddl %0, %1\n" |
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| 627 | jermar | 69 | : "=r" (r), "=m" (val->count) |
| 477 | vana | 70 | ); |
| 627 | jermar | 71 | |
| 477 | vana | 72 | return r; |
| 73 | } |
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| 74 | |||
| 627 | jermar | 75 | static inline count_t atomic_dec_pre(atomic_t *val) |
| 477 | vana | 76 | { |
| 627 | jermar | 77 | count_t r; |
| 78 | |||
| 477 | vana | 79 | __asm__ volatile ( |
| 557 | jermar | 80 | "movl $-1, %0\n" |
| 81 | "lock xaddl %0, %1\n" |
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| 627 | jermar | 82 | : "=r" (r), "=m" (*val) |
| 477 | vana | 83 | ); |
| 627 | jermar | 84 | |
| 477 | vana | 85 | return r; |
| 86 | } |
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| 87 | |||
| 88 | #define atomic_inc_post(val) (atomic_inc_pre(val)+1) |
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| 89 | #define atomic_dec_post(val) (atomic_dec_pre(val)-1) |
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| 90 | |||
| 625 | palkovsky | 91 | static inline int test_and_set(atomic_t *val) { |
| 115 | jermar | 92 | int v; |
| 93 | |||
| 94 | __asm__ volatile ( |
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| 95 | "movl $1, %0\n" |
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| 259 | palkovsky | 96 | "xchgl %0, %1\n" |
| 625 | palkovsky | 97 | : "=r" (v),"=m" (val->count) |
| 115 | jermar | 98 | ); |
| 99 | |||
| 100 | return v; |
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| 101 | } |
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| 102 | |||
| 103 | |||
| 116 | jermar | 104 | extern void spinlock_arch(volatile int *val); |
| 1 | jermar | 105 | |
| 106 | #endif |