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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 libcarm32 |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** @file |
32 | /** @file |
33 | * @brief Atomic operations. |
33 | * @brief Atomic operations. |
34 | */ |
34 | */ |
35 | 35 | ||
36 | #ifndef LIBC_arm32_ATOMIC_H_ |
36 | #ifndef LIBC_arm32_ATOMIC_H_ |
37 | #define LIBC_arm32_ATOMIC_H_ |
37 | #define LIBC_arm32_ATOMIC_H_ |
38 | 38 | ||
39 | /** Atomic addition. |
39 | /** Atomic addition. |
40 | * |
40 | * |
41 | * @param val Where to add. |
41 | * @param val Where to add. |
42 | * @param i Value to be added. |
42 | * @param i Value to be added. |
43 | * |
43 | * |
44 | * @return Value after addition. |
44 | * @return Value after addition. |
45 | */ |
45 | */ |
46 | static inline long atomic_add(atomic_t *val, int i) |
46 | static inline long atomic_add(atomic_t *val, int i) |
47 | { |
47 | { |
48 | int ret; |
48 | int ret; |
49 | volatile long * mem = &(val->count); |
49 | volatile long * mem = &(val->count); |
50 | 50 | ||
51 | asm volatile ( |
51 | asm volatile ( |
52 | "1: \n" |
52 | "1: \n" |
53 | "ldr r2, [%1] \n" |
53 | "ldr r2, [%1] \n" |
54 | "add r3, r2, %2 \n" |
54 | "add r3, r2, %2 \n" |
55 | "str r3, %0 \n" |
55 | "str r3, %0 \n" |
56 | "swp r3, r3, [%1] \n" |
56 | "swp r3, r3, [%1] \n" |
57 | "cmp r3, r2 \n" |
57 | "cmp r3, r2 \n" |
58 | "bne 1b \n" |
58 | "bne 1b \n" |
59 | 59 | ||
60 | : "=m" (ret) |
60 | : "=m" (ret) |
61 | : "r" (mem), "r" (i) |
61 | : "r" (mem), "r" (i) |
62 | : "r3", "r2" |
62 | : "r3", "r2" |
63 | ); |
63 | ); |
64 | 64 | ||
65 | return ret; |
65 | return ret; |
66 | } |
66 | } |
67 | 67 | ||
68 | 68 | ||
69 | /** Atomic increment. |
69 | /** Atomic increment. |
70 | * |
70 | * |
71 | * @param val Variable to be incremented. |
71 | * @param val Variable to be incremented. |
72 | */ |
72 | */ |
73 | static inline void atomic_inc(atomic_t *val) { atomic_add(val, 1); } |
73 | static inline void atomic_inc(atomic_t *val) { atomic_add(val, 1); } |
74 | 74 | ||
- | 75 | ||
75 | /** Atomic decrement. |
76 | /** Atomic decrement. |
76 | * |
77 | * |
77 | * @param val Variable to be decremented. |
78 | * @param val Variable to be decremented. |
78 | */ |
79 | */ |
79 | static inline void atomic_dec(atomic_t *val) { atomic_add(val, -1); } |
80 | static inline void atomic_dec(atomic_t *val) { atomic_add(val, -1); } |
80 | 81 | ||
- | 82 | ||
81 | /** Atomic pre-increment. |
83 | /** Atomic pre-increment. |
82 | * |
84 | * |
83 | * @param val Variable to be incremented. |
85 | * @param val Variable to be incremented. |
84 | * @return Value after incrementation. |
86 | * @return Value after incrementation. |
85 | */ |
87 | */ |
86 | static inline long atomic_preinc(atomic_t *val) { return atomic_add(val, 1); } |
88 | static inline long atomic_preinc(atomic_t *val) { return atomic_add(val, 1); } |
87 | 89 | ||
- | 90 | ||
88 | /** Atomic pre-decrement. |
91 | /** Atomic pre-decrement. |
89 | * |
92 | * |
90 | * @param val Variable to be decremented. |
93 | * @param val Variable to be decremented. |
91 | * @return Value after decrementation. |
94 | * @return Value after decrementation. |
92 | */ |
95 | */ |
93 | static inline long atomic_predec(atomic_t *val) { return atomic_add(val, -1); } |
96 | static inline long atomic_predec(atomic_t *val) { return atomic_add(val, -1); } |
94 | 97 | ||
- | 98 | ||
95 | /** Atomic post-increment. |
99 | /** Atomic post-increment. |
96 | * |
100 | * |
97 | * @param val Variable to be incremented. |
101 | * @param val Variable to be incremented. |
98 | * @return Value before incrementation. |
102 | * @return Value before incrementation. |
99 | */ |
103 | */ |
100 | static inline long atomic_postinc(atomic_t *val) { return atomic_add(val, 1) - 1; } |
104 | static inline long atomic_postinc(atomic_t *val) { return atomic_add(val, 1) - 1; } |
101 | 105 | ||
- | 106 | ||
102 | /** Atomic post-decrement. |
107 | /** Atomic post-decrement. |
103 | * |
108 | * |
104 | * @param val Variable to be decremented. |
109 | * @param val Variable to be decremented. |
105 | * @return Value before decrementation. |
110 | * @return Value before decrementation. |
106 | */ |
111 | */ |
107 | static inline long atomic_postdec(atomic_t *val) { return atomic_add(val, -1) + 1; } |
112 | static inline long atomic_postdec(atomic_t *val) { return atomic_add(val, -1) + 1; } |
108 | 113 | ||
109 | 114 | ||
110 | #endif |
115 | #endif |
111 | 116 | ||
112 | /** @} |
117 | /** @} |
113 | */ |
118 | */ |
114 | 119 |