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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 |