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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) |
73 | static inline void atomic_inc(atomic_t *val) |
74 | { |
74 | { |
75 | atomic_add(val, 1); |
75 | atomic_add(val, 1); |
76 | } |
76 | } |
77 | 77 | ||
78 | 78 | ||
79 | /** Atomic decrement. |
79 | /** Atomic decrement. |
80 | * |
80 | * |
81 | * @param val Variable to be decremented. |
81 | * @param val Variable to be decremented. |
82 | */ |
82 | */ |
83 | static inline void atomic_dec(atomic_t *val) |
83 | static inline void atomic_dec(atomic_t *val) |
84 | { |
84 | { |
85 | atomic_add(val, -1); |
85 | atomic_add(val, -1); |
86 | } |
86 | } |
87 | 87 | ||
88 | 88 | ||
89 | /** Atomic pre-increment. |
89 | /** Atomic pre-increment. |
90 | * |
90 | * |
91 | * @param val Variable to be incremented. |
91 | * @param val Variable to be incremented. |
92 | * @return Value after incrementation. |
92 | * @return Value after incrementation. |
93 | */ |
93 | */ |
94 | static inline long atomic_preinc(atomic_t *val) |
94 | static inline long atomic_preinc(atomic_t *val) |
95 | { |
95 | { |
96 | return atomic_add(val, 1); |
96 | return atomic_add(val, 1); |
97 | } |
97 | } |
98 | 98 | ||
99 | 99 | ||
100 | /** Atomic pre-decrement. |
100 | /** Atomic pre-decrement. |
101 | * |
101 | * |
102 | * @param val Variable to be decremented. |
102 | * @param val Variable to be decremented. |
103 | * @return Value after decrementation. |
103 | * @return Value after decrementation. |
104 | */ |
104 | */ |
105 | static inline long atomic_predec(atomic_t *val) |
105 | static inline long atomic_predec(atomic_t *val) |
106 | { |
106 | { |
107 | return atomic_add(val, -1); |
107 | return atomic_add(val, -1); |
108 | } |
108 | } |
109 | 109 | ||
110 | 110 | ||
111 | /** Atomic post-increment. |
111 | /** Atomic post-increment. |
112 | * |
112 | * |
113 | * @param val Variable to be incremented. |
113 | * @param val Variable to be incremented. |
114 | * @return Value before incrementation. |
114 | * @return Value before incrementation. |
115 | */ |
115 | */ |
116 | static inline long atomic_postinc(atomic_t *val) |
116 | static inline long atomic_postinc(atomic_t *val) |
117 | { |
117 | { |
118 | return atomic_add(val, 1) - 1; |
118 | return atomic_add(val, 1) - 1; |
119 | } |
119 | } |
120 | 120 | ||
121 | 121 | ||
122 | /** Atomic post-decrement. |
122 | /** Atomic post-decrement. |
123 | * |
123 | * |
124 | * @param val Variable to be decremented. |
124 | * @param val Variable to be decremented. |
125 | * @return Value before decrementation. |
125 | * @return Value before decrementation. |
126 | */ |
126 | */ |
127 | static inline long atomic_postdec(atomic_t *val) |
127 | static inline long atomic_postdec(atomic_t *val) |
128 | { |
128 | { |
129 | return atomic_add(val, -1) + 1; |
129 | return atomic_add(val, -1) + 1; |
130 | } |
130 | } |
131 | 131 | ||
132 | 132 | ||
133 | #endif |
133 | #endif |
134 | 134 | ||
135 | /** @} |
135 | /** @} |
136 | */ |
136 | */ |
137 | 137 |