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1 | /* |
1 | /* |
2 | * Copyright (c) 2005 Jakub Jermar |
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: |
Line 28... | Line 28... | ||
28 | 28 | ||
29 | /** @addtogroup libcarm32 |
29 | /** @addtogroup libcarm32 |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** @file |
32 | /** @file |
- | 33 | * @brief Atomic operations. |
|
33 | */ |
34 | */ |
34 | 35 | ||
35 | #ifndef LIBC_arm32_ATOMIC_H_ |
36 | #ifndef LIBC_arm32_ATOMIC_H_ |
36 | #define LIBC_arm32_ATOMIC_H_ |
37 | #define LIBC_arm32_ATOMIC_H_ |
37 | 38 | ||
38 | /** Atomic addition. |
39 | /** Atomic addition. |
39 | * |
40 | * |
40 | * @param val Atomic value. |
41 | * @param val Where to add. |
41 | * @param imm Value to add. |
42 | * @param i Value to be added. |
42 | * |
43 | * |
43 | * @return Value after addition. |
44 | * @return Value after addition. |
44 | */ |
45 | */ |
45 | static inline long atomic_add(atomic_t *val, int imm) |
46 | static inline long atomic_add(atomic_t *val, int i) |
46 | { |
47 | { |
- | 48 | int ret; |
|
- | 49 | volatile long * mem = &(val->count); |
|
- | 50 | ||
- | 51 | asm volatile ( |
|
- | 52 | "1: \n" |
|
- | 53 | "ldr r2, [%1] \n" |
|
- | 54 | "add r3, r2, %2 \n" |
|
- | 55 | "str r3, %0 \n" |
|
- | 56 | "swp r3, r3, [%1] \n" |
|
- | 57 | "cmp r3, r2 \n" |
|
- | 58 | "bne 1b \n" |
|
- | 59 | ||
47 | /* TODO */ |
60 | : "=m" (ret) |
48 | return (val->count += imm); |
61 | : "r" (mem), "r" (i) |
- | 62 | : "r3", "r2" |
|
- | 63 | ); |
|
- | 64 | ||
- | 65 | return ret; |
|
49 | } |
66 | } |
50 | 67 | ||
- | 68 | ||
- | 69 | /** Atomic increment. |
|
- | 70 | * |
|
- | 71 | * @param val Variable to be incremented. |
|
- | 72 | */ |
|
51 | 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 | ||
- | 75 | ||
- | 76 | /** Atomic decrement. |
|
- | 77 | * |
|
- | 78 | * @param val Variable to be decremented. |
|
- | 79 | */ |
|
52 | 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); } |
53 | 81 | ||
54 | static inline long atomic_preinc(atomic_t *val) { return atomic_add(val, 1) + 1; } |
- | |
55 | static inline long atomic_predec(atomic_t *val) { return atomic_add(val, -1) - 1; } |
- | |
56 | 82 | ||
- | 83 | /** Atomic pre-increment. |
|
- | 84 | * |
|
- | 85 | * @param val Variable to be incremented. |
|
- | 86 | * @return Value after incrementation. |
|
- | 87 | */ |
|
57 | static inline long atomic_postinc(atomic_t *val) { return atomic_add(val, 1); } |
88 | static inline long atomic_preinc(atomic_t *val) { return atomic_add(val, 1); } |
- | 89 | ||
- | 90 | ||
- | 91 | /** Atomic pre-decrement. |
|
- | 92 | * |
|
- | 93 | * @param val Variable to be decremented. |
|
- | 94 | * @return Value after decrementation. |
|
- | 95 | */ |
|
58 | static inline long atomic_postdec(atomic_t *val) { return atomic_add(val, -1); } |
96 | static inline long atomic_predec(atomic_t *val) { return atomic_add(val, -1); } |
- | 97 | ||
- | 98 | ||
- | 99 | /** Atomic post-increment. |
|
- | 100 | * |
|
- | 101 | * @param val Variable to be incremented. |
|
- | 102 | * @return Value before incrementation. |
|
- | 103 | */ |
|
- | 104 | static inline long atomic_postinc(atomic_t *val) { return atomic_add(val, 1) - 1; } |
|
- | 105 | ||
- | 106 | ||
- | 107 | /** Atomic post-decrement. |
|
- | 108 | * |
|
- | 109 | * @param val Variable to be decremented. |
|
- | 110 | * @return Value before decrementation. |
|
- | 111 | */ |
|
- | 112 | static inline long atomic_postdec(atomic_t *val) { return atomic_add(val, -1) + 1; } |
|
- | 113 | ||
59 | 114 | ||
60 | #endif |
115 | #endif |
61 | 116 | ||
62 | /** @} |
117 | /** @} |
63 | */ |
118 | */ |