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| Rev | Author | Line No. | Line |
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| 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 | |
| 1001 | decky | 36 | static inline void atomic_inc(atomic_t *val) |
| 37 | { |
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| 990 | decky | 38 | __u32 tmp; |
| 156 | decky | 39 | |
| 990 | decky | 40 | asm __volatile__ ( |
| 41 | "1:\n" |
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| 42 | "lwarx %0, 0, %2\n" |
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| 43 | "addic %0, %0, 1\n" |
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| 44 | "stwcx. %0, 0, %2\n" |
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| 45 | "bne- 1b" |
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| 46 | : "=&r" (tmp), "=m" (val->count) |
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| 47 | : "r" (&val->count), "m" (val->count) |
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| 48 | : "cc"); |
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| 156 | decky | 49 | } |
| 50 | |||
| 1001 | decky | 51 | static inline void atomic_dec(atomic_t *val) |
| 52 | { |
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| 990 | decky | 53 | __u32 tmp; |
| 54 | |||
| 55 | asm __volatile__( |
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| 56 | "1:\n" |
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| 57 | "lwarx %0, 0, %2\n" |
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| 58 | "addic %0, %0, -1\n" |
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| 59 | "stwcx. %0, 0, %2\n" |
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| 60 | "bne- 1b" |
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| 61 | : "=&r" (tmp), "=m" (val->count) |
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| 62 | : "r" (&val->count), "m" (val->count) |
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| 63 | : "cc"); |
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| 156 | decky | 64 | } |
| 65 | |||
| 1001 | decky | 66 | static inline __u32 atomic_inc_pre(atomic_t *val) |
| 67 | { |
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| 68 | atomic_inc(val); |
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| 69 | return val->count - 1; |
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| 70 | } |
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| 71 | |||
| 72 | static inline __u32 atomic_dec_pre(atomic_t *val) |
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| 73 | { |
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| 74 | atomic_dec(val); |
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| 75 | return val->count + 1; |
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| 76 | } |
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| 77 | |||
| 78 | static inline __u32 atomic_inc_post(atomic_t *val) |
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| 79 | { |
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| 80 | atomic_inc(val); |
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| 81 | return val->count; |
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| 82 | } |
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| 83 | |||
| 84 | static inline __u32 atomic_dec_post(atomic_t *val) |
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| 85 | { |
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| 86 | atomic_dec(val); |
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| 87 | return val->count; |
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| 88 | } |
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| 89 | |||
| 625 | palkovsky | 90 | static inline void atomic_set(atomic_t *val, __u32 i) |
| 91 | { |
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| 92 | val->count = i; |
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| 93 | } |
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| 94 | |||
| 95 | static inline __u32 atomic_get(atomic_t *val) |
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| 96 | { |
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| 97 | return val->count; |
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| 98 | } |
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| 99 | |||
| 156 | decky | 100 | #endif |