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| 1 | /* |
1 | /* |
| 2 | * Copyright (C) 2005 Martin Decky |
2 | * Copyright (C) 2005 Martin Decky |
| 3 | * All rights reserved. |
3 | * All rights reserved. |
| 4 | * |
4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
7 | * are met: |
| 8 | * |
8 | * |
| 9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
| 14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
| 15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
| 16 | * |
16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
27 | */ |
| 28 | 28 | ||
| 29 | #ifndef __ppc32_ATOMIC_H__ |
29 | #ifndef __ppc32_ATOMIC_H__ |
| 30 | #define __ppc32_ATOMIC_H__ |
30 | #define __ppc32_ATOMIC_H__ |
| 31 | 31 | ||
| 32 | #include <arch/types.h> |
32 | #include <arch/types.h> |
| 33 | 33 | ||
| 34 | typedef struct { volatile __u32 count; } atomic_t; |
34 | typedef struct { volatile __u32 count; } atomic_t; |
| 35 | 35 | ||
| 36 | /* |
- | |
| 37 | * TODO: these are just placeholders for real implementations of atomic_inc and atomic_dec. |
- | |
| 38 | * WARNING: the following functions cause the code to be preemption-unsafe !!! |
- | |
| 39 | */ |
- | |
| 40 | - | ||
| 41 | static inline void atomic_inc(atomic_t *val) { |
36 | static inline void atomic_inc(atomic_t *val) { |
| 42 | val->count++; |
37 | __u32 tmp; |
| - | 38 | ||
| - | 39 | asm __volatile__ ( |
|
| - | 40 | "1:\n" |
|
| - | 41 | "lwarx %0, 0, %2\n" |
|
| - | 42 | "addic %0, %0, 1\n" |
|
| - | 43 | "stwcx. %0, 0, %2\n" |
|
| - | 44 | "bne- 1b" |
|
| - | 45 | : "=&r" (tmp), "=m" (val->count) |
|
| - | 46 | : "r" (&val->count), "m" (val->count) |
|
| - | 47 | : "cc"); |
|
| 43 | } |
48 | } |
| 44 | 49 | ||
| 45 | static inline void atomic_dec(atomic_t *val) { |
50 | static inline void atomic_dec(atomic_t *val) { |
| 46 | val->count--; |
51 | __u32 tmp; |
| - | 52 | ||
| - | 53 | asm __volatile__( |
|
| - | 54 | "1:\n" |
|
| - | 55 | "lwarx %0, 0, %2\n" |
|
| - | 56 | "addic %0, %0, -1\n" |
|
| - | 57 | "stwcx. %0, 0, %2\n" |
|
| - | 58 | "bne- 1b" |
|
| - | 59 | : "=&r" (tmp), "=m" (val->count) |
|
| - | 60 | : "r" (&val->count), "m" (val->count) |
|
| - | 61 | : "cc"); |
|
| 47 | } |
62 | } |
| 48 | 63 | ||
| 49 | static inline void atomic_set(atomic_t *val, __u32 i) |
64 | static inline void atomic_set(atomic_t *val, __u32 i) |
| 50 | { |
65 | { |
| 51 | val->count = i; |
66 | val->count = i; |
| 52 | } |
67 | } |
| 53 | 68 | ||
| 54 | static inline __u32 atomic_get(atomic_t *val) |
69 | static inline __u32 atomic_get(atomic_t *val) |
| 55 | { |
70 | { |
| 56 | return val->count; |
71 | return val->count; |
| 57 | } |
72 | } |
| 58 | 73 | ||
| 59 | #endif |
74 | #endif |
| 60 | 75 | ||