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1 | /* |
2 | * Copyright (C) 2010 The Android Open Source Project | |
3 | * | |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); | |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at | |
7 | * | |
8 | * http://www.apache.org/licenses/LICENSE-2.0 | |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
15 | */ | |
16 | ||
17 | #ifndef ANDROID_CUTILS_ATOMIC_MIPS_H | |
18 | #define ANDROID_CUTILS_ATOMIC_MIPS_H | |
19 | ||
20 | #include <stdint.h> | |
21 | ||
22 | extern inline void android_compiler_barrier(void) | |
23 | { | |
24 | __asm__ __volatile__ ("" : : : "memory"); | |
25 | } | |
26 | ||
27 | #if ANDROID_SMP == 0 | |
28 | extern inline void android_memory_barrier(void) | |
29 | { | |
30 | android_compiler_barrier(); | |
31 | } | |
32 | extern inline void android_memory_store_barrier(void) | |
33 | { | |
34 | android_compiler_barrier(); | |
35 | } | |
36 | #else | |
37 | extern inline void android_memory_barrier(void) | |
38 | { | |
39 | __asm__ __volatile__ ("sync" : : : "memory"); | |
40 | } | |
41 | extern inline void android_memory_store_barrier(void) | |
42 | { | |
43 | __asm__ __volatile__ ("sync" : : : "memory"); | |
44 | } | |
45 | #endif | |
46 | ||
47 | extern inline int32_t android_atomic_acquire_load(volatile const int32_t *ptr) | |
48 | { | |
49 | int32_t value = *ptr; | |
50 | android_memory_barrier(); | |
51 | return value; | |
52 | } | |
53 | ||
54 | extern inline int32_t android_atomic_release_load(volatile const int32_t *ptr) | |
55 | { | |
56 | android_memory_barrier(); | |
57 | return *ptr; | |
58 | } | |
59 | ||
60 | extern inline void android_atomic_acquire_store(int32_t value, | |
61 | volatile int32_t *ptr) | |
62 | { | |
63 | *ptr = value; | |
64 | android_memory_barrier(); | |
65 | } | |
66 | ||
67 | extern inline void android_atomic_release_store(int32_t value, | |
68 | volatile int32_t *ptr) | |
69 | { | |
70 | android_memory_barrier(); | |
71 | *ptr = value; | |
72 | } | |
73 | ||
74 | extern inline int android_atomic_cas(int32_t old_value, int32_t new_value, | |
75 | volatile int32_t *ptr) | |
76 | { | |
77 | int32_t prev, status; | |
78 | do { | |
79 | __asm__ __volatile__ ( | |
80 | " ll %[prev], (%[ptr])\n" | |
81 | " li %[status], 1\n" | |
82 | " bne %[prev], %[old], 9f\n" | |
83 | " move %[status], %[new_value]\n" | |
84 | " sc %[status], (%[ptr])\n" | |
85 | "9:\n" | |
86 | : [prev] "=&r" (prev), [status] "=&r" (status) | |
87 | : [ptr] "r" (ptr), [old] "r" (old_value), [new_value] "r" (new_value) | |
88 | ); | |
89 | } while (__builtin_expect(status == 0, 0)); | |
90 | return prev != old_value; | |
91 | } | |
92 | ||
93 | extern inline int android_atomic_acquire_cas(int32_t old_value, | |
94 | int32_t new_value, | |
95 | volatile int32_t *ptr) | |
96 | { | |
97 | int status = android_atomic_cas(old_value, new_value, ptr); | |
98 | android_memory_barrier(); | |
99 | return status; | |
100 | } | |
101 | ||
102 | extern inline int android_atomic_release_cas(int32_t old_value, | |
103 | int32_t new_value, | |
104 | volatile int32_t *ptr) | |
105 | { | |
106 | android_memory_barrier(); | |
107 | return android_atomic_cas(old_value, new_value, ptr); | |
108 | } | |
109 | ||
110 | ||
111 | extern inline int32_t android_atomic_swap(int32_t new_value, | |
112 | volatile int32_t *ptr) | |
113 | { | |
114 | int32_t prev, status; | |
115 | do { | |
116 | __asm__ __volatile__ ( | |
117 | " move %[status], %[new_value]\n" | |
118 | " ll %[prev], (%[ptr])\n" | |
119 | " sc %[status], (%[ptr])\n" | |
120 | : [prev] "=&r" (prev), [status] "=&r" (status) | |
121 | : [ptr] "r" (ptr), [new_value] "r" (new_value) | |
122 | ); | |
123 | } while (__builtin_expect(status == 0, 0)); | |
124 | android_memory_barrier(); | |
125 | return prev; | |
126 | } | |
127 | ||
128 | extern inline int32_t android_atomic_add(int32_t increment, | |
129 | volatile int32_t *ptr) | |
130 | { | |
131 | int32_t prev, status; | |
132 | android_memory_barrier(); | |
133 | do { | |
134 | __asm__ __volatile__ ( | |
135 | " ll %[prev], (%[ptr])\n" | |
136 | " addu %[status], %[prev], %[inc]\n" | |
137 | " sc %[status], (%[ptr])\n" | |
138 | : [status] "=&r" (status), [prev] "=&r" (prev) | |
139 | : [ptr] "r" (ptr), [inc] "Ir" (increment) | |
140 | ); | |
141 | } while (__builtin_expect(status == 0, 0)); | |
142 | return prev; | |
143 | } | |
144 | ||
145 | extern inline int32_t android_atomic_inc(volatile int32_t *addr) | |
146 | { | |
147 | return android_atomic_add(1, addr); | |
148 | } | |
149 | ||
150 | extern inline int32_t android_atomic_dec(volatile int32_t *addr) | |
151 | { | |
152 | return android_atomic_add(-1, addr); | |
153 | } | |
154 | ||
155 | extern inline int32_t android_atomic_and(int32_t value, volatile int32_t *ptr) | |
156 | { | |
157 | int32_t prev, status; | |
158 | android_memory_barrier(); | |
159 | do { | |
160 | __asm__ __volatile__ ( | |
161 | " ll %[prev], (%[ptr])\n" | |
162 | " and %[status], %[prev], %[value]\n" | |
163 | " sc %[status], (%[ptr])\n" | |
164 | : [prev] "=&r" (prev), [status] "=&r" (status) | |
165 | : [ptr] "r" (ptr), [value] "Ir" (value) | |
166 | ); | |
167 | } while (__builtin_expect(status == 0, 0)); | |
168 | return prev; | |
169 | } | |
170 | ||
171 | extern inline int32_t android_atomic_or(int32_t value, volatile int32_t *ptr) | |
172 | { | |
173 | int32_t prev, status; | |
174 | android_memory_barrier(); | |
175 | do { | |
176 | __asm__ __volatile__ ( | |
177 | " ll %[prev], (%[ptr])\n" | |
178 | " or %[status], %[prev], %[value]\n" | |
179 | " sc %[status], (%[ptr])\n" | |
180 | : [prev] "=&r" (prev), [status] "=&r" (status) | |
181 | : [ptr] "r" (ptr), [value] "Ir" (value) | |
182 | ); | |
183 | } while (__builtin_expect(status == 0, 0)); | |
184 | return prev; | |
185 | } | |
186 | ||
187 | #endif /* ANDROID_CUTILS_ATOMIC_MIPS_H */ |