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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 | /** @addtogroup ppc32 |
29 | /** @addtogroup ppc32 |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** @file |
32 | /** @file |
33 | */ |
33 | */ |
34 | 34 | ||
35 | #ifndef KERN_ppc32_ATOMIC_H_ |
35 | #ifndef KERN_ppc32_ATOMIC_H_ |
36 | #define KERN_ppc32_ATOMIC_H_ |
36 | #define KERN_ppc32_ATOMIC_H_ |
37 | 37 | ||
38 | static inline void atomic_inc(atomic_t *val) |
38 | static inline void atomic_inc(atomic_t *val) |
39 | { |
39 | { |
40 | long tmp; |
40 | long tmp; |
41 | 41 | ||
42 | asm volatile ( |
42 | asm volatile ( |
43 | "1:\n" |
43 | "1:\n" |
44 | "lwarx %0, 0, %2\n" |
44 | "lwarx %0, 0, %2\n" |
45 | "addic %0, %0, 1\n" |
45 | "addic %0, %0, 1\n" |
46 | "stwcx. %0, 0, %2\n" |
46 | "stwcx. %0, 0, %2\n" |
47 | "bne- 1b" |
47 | "bne- 1b" |
48 | : "=&r" (tmp), "=m" (val->count) |
48 | : "=&r" (tmp), "=m" (val->count) |
49 | : "r" (&val->count), "m" (val->count) |
49 | : "r" (&val->count), "m" (val->count) |
50 | : "cc" |
50 | : "cc" |
51 | ); |
51 | ); |
52 | } |
52 | } |
53 | 53 | ||
54 | static inline void atomic_dec(atomic_t *val) |
54 | static inline void atomic_dec(atomic_t *val) |
55 | { |
55 | { |
56 | long tmp; |
56 | long tmp; |
57 | 57 | ||
58 | asm volatile ( |
58 | asm volatile ( |
59 | "1:\n" |
59 | "1:\n" |
60 | "lwarx %0, 0, %2\n" |
60 | "lwarx %0, 0, %2\n" |
61 | "addic %0, %0, -1\n" |
61 | "addic %0, %0, -1\n" |
62 | "stwcx. %0, 0, %2\n" |
62 | "stwcx. %0, 0, %2\n" |
63 | "bne- 1b" |
63 | "bne- 1b" |
64 | : "=&r" (tmp), "=m" (val->count) |
64 | : "=&r" (tmp), "=m" (val->count) |
65 | : "r" (&val->count), "m" (val->count) |
65 | : "r" (&val->count), "m" (val->count) |
66 | : "cc" |
66 | : "cc" |
67 | ); |
67 | ); |
68 | } |
68 | } |
69 | 69 | ||
70 | static inline long atomic_postinc(atomic_t *val) |
70 | static inline long atomic_postinc(atomic_t *val) |
71 | { |
71 | { |
72 | atomic_inc(val); |
72 | atomic_inc(val); |
73 | return val->count - 1; |
73 | return val->count - 1; |
74 | } |
74 | } |
75 | 75 | ||
76 | static inline long atomic_postdec(atomic_t *val) |
76 | static inline long atomic_postdec(atomic_t *val) |
77 | { |
77 | { |
78 | atomic_dec(val); |
78 | atomic_dec(val); |
79 | return val->count + 1; |
79 | return val->count + 1; |
80 | } |
80 | } |
81 | 81 | ||
82 | static inline long atomic_preinc(atomic_t *val) |
82 | static inline long atomic_preinc(atomic_t *val) |
83 | { |
83 | { |
84 | atomic_inc(val); |
84 | atomic_inc(val); |
85 | return val->count; |
85 | return val->count; |
86 | } |
86 | } |
87 | 87 | ||
88 | static inline long atomic_predec(atomic_t *val) |
88 | static inline long atomic_predec(atomic_t *val) |
89 | { |
89 | { |
90 | atomic_dec(val); |
90 | atomic_dec(val); |
91 | return val->count; |
91 | return val->count; |
92 | } |
92 | } |
93 | 93 | ||
94 | #endif |
94 | #endif |
95 | 95 | ||
96 | /** @} |
96 | /** @} |
97 | */ |
97 | */ |
98 | 98 |