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| Rev | Author | Line No. | Line |
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| 1110 | jermar | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2001-2004 Jakub Jermar |
| 1110 | jermar | 3 | * All rights reserved. |
| 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 | |||
| 1866 | jermar | 29 | /** @addtogroup libcia32 |
| 1656 | cejka | 30 | * @{ |
| 31 | */ |
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| 32 | /** @file |
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| 33 | */ |
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| 34 | |||
| 1866 | jermar | 35 | #ifndef LIBC_ia32_ATOMIC_H_ |
| 36 | #define LIBC_ia32_ATOMIC_H_ |
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| 1110 | jermar | 37 | |
| 38 | static inline void atomic_inc(atomic_t *val) { |
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| 3164 | jermar | 39 | asm volatile ("lock incl %0\n" : "+m" (val->count)); |
| 1110 | jermar | 40 | } |
| 41 | |||
| 42 | static inline void atomic_dec(atomic_t *val) { |
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| 3164 | jermar | 43 | asm volatile ("lock decl %0\n" : "+m" (val->count)); |
| 1110 | jermar | 44 | } |
| 45 | |||
| 46 | static inline long atomic_postinc(atomic_t *val) |
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| 47 | { |
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| 48 | long r; |
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| 49 | |||
| 2082 | decky | 50 | asm volatile ( |
| 1110 | jermar | 51 | "movl $1, %0\n" |
| 52 | "lock xaddl %0, %1\n" |
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| 3164 | jermar | 53 | : "=r" (r), "+m" (val->count) |
| 1110 | jermar | 54 | ); |
| 55 | |||
| 56 | return r; |
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| 57 | } |
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| 58 | |||
| 59 | static inline long atomic_postdec(atomic_t *val) |
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| 60 | { |
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| 61 | long r; |
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| 62 | |||
| 2082 | decky | 63 | asm volatile ( |
| 1110 | jermar | 64 | "movl $-1, %0\n" |
| 65 | "lock xaddl %0, %1\n" |
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| 3164 | jermar | 66 | : "=r" (r), "+m" (val->count) |
| 1110 | jermar | 67 | ); |
| 68 | |||
| 69 | return r; |
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| 70 | } |
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| 71 | |||
| 3164 | jermar | 72 | #define atomic_preinc(val) (atomic_postinc(val) + 1) |
| 73 | #define atomic_predec(val) (atomic_postdec(val) - 1) |
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| 1110 | jermar | 74 | |
| 75 | #endif |
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| 1656 | cejka | 76 | |
| 1866 | jermar | 77 | /** @} |
| 1656 | cejka | 78 | */ |