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1 | /* |
1 | /* |
2 | * Copyright (c) 2007 Michal Kebrt |
2 | * Copyright (c) 2007 Michal Kebrt |
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 libcarm32 |
29 | /** @addtogroup arm32 |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** @file |
32 | /** @file |
33 | */ |
33 | */ |
34 | 34 | ||
35 | #ifndef KERN_arm32_ATOMIC_H_ |
35 | #ifndef KERN_arm32_ATOMIC_H_ |
36 | #define KERN_arm32_ATOMIC_H_ |
36 | #define KERN_arm32_ATOMIC_H_ |
37 | 37 | ||
38 | /** Atomic addition. |
38 | /** Atomic addition. |
39 | * |
39 | * |
40 | * @param val "Atomic variable". |
40 | * @param val "Atomic variable". |
41 | * @param i Value to add. |
41 | * @param i Value to add. |
42 | * |
42 | * |
43 | * @return Value after addition. |
43 | * @return Value after addition. |
44 | */ |
44 | */ |
45 | static inline long atomic_add(atomic_t *val, int i) |
45 | static inline long atomic_add(atomic_t *val, int i) |
46 | { |
46 | { |
47 | int ret; |
47 | int ret; |
48 | volatile long * mem = &(val->count); |
48 | volatile long * mem = &(val->count); |
49 | 49 | ||
50 | asm volatile ( |
50 | asm volatile ( |
51 | "1: \n" |
51 | "1: \n" |
52 | "ldr r2, [%1] \n" |
52 | "ldr r2, [%1] \n" |
53 | "add r3, r2, %2 \n" |
53 | "add r3, r2, %2 \n" |
54 | "str r3, %0 \n" |
54 | "str r3, %0 \n" |
55 | "swp r3, r3, [%1] \n" |
55 | "swp r3, r3, [%1] \n" |
56 | "cmp r3, r2 \n" |
56 | "cmp r3, r2 \n" |
57 | "bne 1b \n" |
57 | "bne 1b \n" |
58 | 58 | ||
59 | : "=m" (ret) |
59 | : "=m" (ret) |
60 | : "r" (mem), "r" (i) |
60 | : "r" (mem), "r" (i) |
61 | : "r3", "r2" |
61 | : "r3", "r2" |
62 | ); |
62 | ); |
63 | 63 | ||
64 | return ret; |
64 | return ret; |
65 | } |
65 | } |
66 | 66 | ||
67 | static inline void atomic_inc(atomic_t *val) { atomic_add(val, 1); } |
67 | static inline void atomic_inc(atomic_t *val) { atomic_add(val, 1); } |
68 | static inline void atomic_dec(atomic_t *val) { atomic_add(val, -1); } |
68 | static inline void atomic_dec(atomic_t *val) { atomic_add(val, -1); } |
69 | 69 | ||
70 | static inline long atomic_preinc(atomic_t *val) { return atomic_add(val, 1); } |
70 | static inline long atomic_preinc(atomic_t *val) { return atomic_add(val, 1); } |
71 | static inline long atomic_predec(atomic_t *val) { return atomic_add(val, -1); } |
71 | static inline long atomic_predec(atomic_t *val) { return atomic_add(val, -1); } |
72 | 72 | ||
73 | static inline long atomic_postinc(atomic_t *val) { return atomic_add(val, 1) - 1; } |
73 | static inline long atomic_postinc(atomic_t *val) { return atomic_add(val, 1) - 1; } |
74 | static inline long atomic_postdec(atomic_t *val) { return atomic_add(val, -1) + 1; } |
74 | static inline long atomic_postdec(atomic_t *val) { return atomic_add(val, -1) + 1; } |
75 | 75 | ||
76 | #endif |
76 | #endif |
77 | 77 | ||
78 | /** @} |
78 | /** @} |
79 | */ |
79 | */ |
80 | 80 |