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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 156 | decky | 1 | /* |
| 2 | * Copyright (C) 2005 Martin Decky |
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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 | |||
| 342 | jermar | 29 | #ifndef __ppc32_ATOMIC_H__ |
| 30 | #define __ppc32_ATOMIC_H__ |
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| 156 | decky | 31 | |
| 475 | jermar | 32 | #include <arch/types.h> |
| 33 | |||
| 625 | palkovsky | 34 | typedef struct { volatile __u32 count; } atomic_t; |
| 475 | jermar | 35 | |
| 990 | decky | 36 | static inline void atomic_inc(atomic_t *val) { |
| 37 | __u32 tmp; |
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| 156 | decky | 38 | |
| 990 | decky | 39 | asm __volatile__ ( |
| 40 | "1:\n" |
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| 41 | "lwarx %0, 0, %2\n" |
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| 42 | "addic %0, %0, 1\n" |
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| 43 | "stwcx. %0, 0, %2\n" |
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| 44 | "bne- 1b" |
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| 45 | : "=&r" (tmp), "=m" (val->count) |
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| 46 | : "r" (&val->count), "m" (val->count) |
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| 47 | : "cc"); |
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| 156 | decky | 48 | } |
| 49 | |||
| 475 | jermar | 50 | static inline void atomic_dec(atomic_t *val) { |
| 990 | decky | 51 | __u32 tmp; |
| 52 | |||
| 53 | asm __volatile__( |
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| 54 | "1:\n" |
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| 55 | "lwarx %0, 0, %2\n" |
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| 56 | "addic %0, %0, -1\n" |
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| 57 | "stwcx. %0, 0, %2\n" |
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| 58 | "bne- 1b" |
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| 59 | : "=&r" (tmp), "=m" (val->count) |
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| 60 | : "r" (&val->count), "m" (val->count) |
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| 61 | : "cc"); |
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| 156 | decky | 62 | } |
| 63 | |||
| 625 | palkovsky | 64 | static inline void atomic_set(atomic_t *val, __u32 i) |
| 65 | { |
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| 66 | val->count = i; |
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| 67 | } |
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| 68 | |||
| 69 | static inline __u32 atomic_get(atomic_t *val) |
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| 70 | { |
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| 71 | return val->count; |
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| 72 | } |
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| 73 | |||
| 156 | decky | 74 | #endif |