diff options
Diffstat (limited to 'include/asm-xtensa/atomic.h')
-rw-r--r-- | include/asm-xtensa/atomic.h | 300 |
1 files changed, 0 insertions, 300 deletions
diff --git a/include/asm-xtensa/atomic.h b/include/asm-xtensa/atomic.h deleted file mode 100644 index b3b23540f14d..000000000000 --- a/include/asm-xtensa/atomic.h +++ /dev/null | |||
@@ -1,300 +0,0 @@ | |||
1 | /* | ||
2 | * include/asm-xtensa/atomic.h | ||
3 | * | ||
4 | * Atomic operations that C can't guarantee us. Useful for resource counting.. | ||
5 | * | ||
6 | * This file is subject to the terms and conditions of the GNU General Public | ||
7 | * License. See the file "COPYING" in the main directory of this archive | ||
8 | * for more details. | ||
9 | * | ||
10 | * Copyright (C) 2001 - 2005 Tensilica Inc. | ||
11 | */ | ||
12 | |||
13 | #ifndef _XTENSA_ATOMIC_H | ||
14 | #define _XTENSA_ATOMIC_H | ||
15 | |||
16 | #include <linux/stringify.h> | ||
17 | |||
18 | typedef struct { volatile int counter; } atomic_t; | ||
19 | |||
20 | #ifdef __KERNEL__ | ||
21 | #include <asm/processor.h> | ||
22 | #include <asm/system.h> | ||
23 | |||
24 | #define ATOMIC_INIT(i) { (i) } | ||
25 | |||
26 | /* | ||
27 | * This Xtensa implementation assumes that the right mechanism | ||
28 | * for exclusion is for locking interrupts to level 1. | ||
29 | * | ||
30 | * Locking interrupts looks like this: | ||
31 | * | ||
32 | * rsil a15, 1 | ||
33 | * <code> | ||
34 | * wsr a15, PS | ||
35 | * rsync | ||
36 | * | ||
37 | * Note that a15 is used here because the register allocation | ||
38 | * done by the compiler is not guaranteed and a window overflow | ||
39 | * may not occur between the rsil and wsr instructions. By using | ||
40 | * a15 in the rsil, the machine is guaranteed to be in a state | ||
41 | * where no register reference will cause an overflow. | ||
42 | */ | ||
43 | |||
44 | /** | ||
45 | * atomic_read - read atomic variable | ||
46 | * @v: pointer of type atomic_t | ||
47 | * | ||
48 | * Atomically reads the value of @v. | ||
49 | */ | ||
50 | #define atomic_read(v) ((v)->counter) | ||
51 | |||
52 | /** | ||
53 | * atomic_set - set atomic variable | ||
54 | * @v: pointer of type atomic_t | ||
55 | * @i: required value | ||
56 | * | ||
57 | * Atomically sets the value of @v to @i. | ||
58 | */ | ||
59 | #define atomic_set(v,i) ((v)->counter = (i)) | ||
60 | |||
61 | /** | ||
62 | * atomic_add - add integer to atomic variable | ||
63 | * @i: integer value to add | ||
64 | * @v: pointer of type atomic_t | ||
65 | * | ||
66 | * Atomically adds @i to @v. | ||
67 | */ | ||
68 | static inline void atomic_add(int i, atomic_t * v) | ||
69 | { | ||
70 | unsigned int vval; | ||
71 | |||
72 | __asm__ __volatile__( | ||
73 | "rsil a15, "__stringify(LOCKLEVEL)"\n\t" | ||
74 | "l32i %0, %2, 0 \n\t" | ||
75 | "add %0, %0, %1 \n\t" | ||
76 | "s32i %0, %2, 0 \n\t" | ||
77 | "wsr a15, "__stringify(PS)" \n\t" | ||
78 | "rsync \n" | ||
79 | : "=&a" (vval) | ||
80 | : "a" (i), "a" (v) | ||
81 | : "a15", "memory" | ||
82 | ); | ||
83 | } | ||
84 | |||
85 | /** | ||
86 | * atomic_sub - subtract the atomic variable | ||
87 | * @i: integer value to subtract | ||
88 | * @v: pointer of type atomic_t | ||
89 | * | ||
90 | * Atomically subtracts @i from @v. | ||
91 | */ | ||
92 | static inline void atomic_sub(int i, atomic_t *v) | ||
93 | { | ||
94 | unsigned int vval; | ||
95 | |||
96 | __asm__ __volatile__( | ||
97 | "rsil a15, "__stringify(LOCKLEVEL)"\n\t" | ||
98 | "l32i %0, %2, 0 \n\t" | ||
99 | "sub %0, %0, %1 \n\t" | ||
100 | "s32i %0, %2, 0 \n\t" | ||
101 | "wsr a15, "__stringify(PS)" \n\t" | ||
102 | "rsync \n" | ||
103 | : "=&a" (vval) | ||
104 | : "a" (i), "a" (v) | ||
105 | : "a15", "memory" | ||
106 | ); | ||
107 | } | ||
108 | |||
109 | /* | ||
110 | * We use atomic_{add|sub}_return to define other functions. | ||
111 | */ | ||
112 | |||
113 | static inline int atomic_add_return(int i, atomic_t * v) | ||
114 | { | ||
115 | unsigned int vval; | ||
116 | |||
117 | __asm__ __volatile__( | ||
118 | "rsil a15,"__stringify(LOCKLEVEL)"\n\t" | ||
119 | "l32i %0, %2, 0 \n\t" | ||
120 | "add %0, %0, %1 \n\t" | ||
121 | "s32i %0, %2, 0 \n\t" | ||
122 | "wsr a15, "__stringify(PS)" \n\t" | ||
123 | "rsync \n" | ||
124 | : "=&a" (vval) | ||
125 | : "a" (i), "a" (v) | ||
126 | : "a15", "memory" | ||
127 | ); | ||
128 | |||
129 | return vval; | ||
130 | } | ||
131 | |||
132 | static inline int atomic_sub_return(int i, atomic_t * v) | ||
133 | { | ||
134 | unsigned int vval; | ||
135 | |||
136 | __asm__ __volatile__( | ||
137 | "rsil a15,"__stringify(LOCKLEVEL)"\n\t" | ||
138 | "l32i %0, %2, 0 \n\t" | ||
139 | "sub %0, %0, %1 \n\t" | ||
140 | "s32i %0, %2, 0 \n\t" | ||
141 | "wsr a15, "__stringify(PS)" \n\t" | ||
142 | "rsync \n" | ||
143 | : "=&a" (vval) | ||
144 | : "a" (i), "a" (v) | ||
145 | : "a15", "memory" | ||
146 | ); | ||
147 | |||
148 | return vval; | ||
149 | } | ||
150 | |||
151 | /** | ||
152 | * atomic_sub_and_test - subtract value from variable and test result | ||
153 | * @i: integer value to subtract | ||
154 | * @v: pointer of type atomic_t | ||
155 | * | ||
156 | * Atomically subtracts @i from @v and returns | ||
157 | * true if the result is zero, or false for all | ||
158 | * other cases. | ||
159 | */ | ||
160 | #define atomic_sub_and_test(i,v) (atomic_sub_return((i),(v)) == 0) | ||
161 | |||
162 | /** | ||
163 | * atomic_inc - increment atomic variable | ||
164 | * @v: pointer of type atomic_t | ||
165 | * | ||
166 | * Atomically increments @v by 1. | ||
167 | */ | ||
168 | #define atomic_inc(v) atomic_add(1,(v)) | ||
169 | |||
170 | /** | ||
171 | * atomic_inc - increment atomic variable | ||
172 | * @v: pointer of type atomic_t | ||
173 | * | ||
174 | * Atomically increments @v by 1. | ||
175 | */ | ||
176 | #define atomic_inc_return(v) atomic_add_return(1,(v)) | ||
177 | |||
178 | /** | ||
179 | * atomic_dec - decrement atomic variable | ||
180 | * @v: pointer of type atomic_t | ||
181 | * | ||
182 | * Atomically decrements @v by 1. | ||
183 | */ | ||
184 | #define atomic_dec(v) atomic_sub(1,(v)) | ||
185 | |||
186 | /** | ||
187 | * atomic_dec_return - decrement atomic variable | ||
188 | * @v: pointer of type atomic_t | ||
189 | * | ||
190 | * Atomically decrements @v by 1. | ||
191 | */ | ||
192 | #define atomic_dec_return(v) atomic_sub_return(1,(v)) | ||
193 | |||
194 | /** | ||
195 | * atomic_dec_and_test - decrement and test | ||
196 | * @v: pointer of type atomic_t | ||
197 | * | ||
198 | * Atomically decrements @v by 1 and | ||
199 | * returns true if the result is 0, or false for all other | ||
200 | * cases. | ||
201 | */ | ||
202 | #define atomic_dec_and_test(v) (atomic_sub_return(1,(v)) == 0) | ||
203 | |||
204 | /** | ||
205 | * atomic_inc_and_test - increment and test | ||
206 | * @v: pointer of type atomic_t | ||
207 | * | ||
208 | * Atomically increments @v by 1 | ||
209 | * and returns true if the result is zero, or false for all | ||
210 | * other cases. | ||
211 | */ | ||
212 | #define atomic_inc_and_test(v) (atomic_add_return(1,(v)) == 0) | ||
213 | |||
214 | /** | ||
215 | * atomic_add_negative - add and test if negative | ||
216 | * @v: pointer of type atomic_t | ||
217 | * @i: integer value to add | ||
218 | * | ||
219 | * Atomically adds @i to @v and returns true | ||
220 | * if the result is negative, or false when | ||
221 | * result is greater than or equal to zero. | ||
222 | */ | ||
223 | #define atomic_add_negative(i,v) (atomic_add_return((i),(v)) < 0) | ||
224 | |||
225 | #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) | ||
226 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) | ||
227 | |||
228 | /** | ||
229 | * atomic_add_unless - add unless the number is a given value | ||
230 | * @v: pointer of type atomic_t | ||
231 | * @a: the amount to add to v... | ||
232 | * @u: ...unless v is equal to u. | ||
233 | * | ||
234 | * Atomically adds @a to @v, so long as it was not @u. | ||
235 | * Returns non-zero if @v was not @u, and zero otherwise. | ||
236 | */ | ||
237 | static __inline__ int atomic_add_unless(atomic_t *v, int a, int u) | ||
238 | { | ||
239 | int c, old; | ||
240 | c = atomic_read(v); | ||
241 | for (;;) { | ||
242 | if (unlikely(c == (u))) | ||
243 | break; | ||
244 | old = atomic_cmpxchg((v), c, c + (a)); | ||
245 | if (likely(old == c)) | ||
246 | break; | ||
247 | c = old; | ||
248 | } | ||
249 | return c != (u); | ||
250 | } | ||
251 | |||
252 | #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) | ||
253 | |||
254 | static inline void atomic_clear_mask(unsigned int mask, atomic_t *v) | ||
255 | { | ||
256 | unsigned int all_f = -1; | ||
257 | unsigned int vval; | ||
258 | |||
259 | __asm__ __volatile__( | ||
260 | "rsil a15,"__stringify(LOCKLEVEL)"\n\t" | ||
261 | "l32i %0, %2, 0 \n\t" | ||
262 | "xor %1, %4, %3 \n\t" | ||
263 | "and %0, %0, %4 \n\t" | ||
264 | "s32i %0, %2, 0 \n\t" | ||
265 | "wsr a15, "__stringify(PS)" \n\t" | ||
266 | "rsync \n" | ||
267 | : "=&a" (vval), "=a" (mask) | ||
268 | : "a" (v), "a" (all_f), "1" (mask) | ||
269 | : "a15", "memory" | ||
270 | ); | ||
271 | } | ||
272 | |||
273 | static inline void atomic_set_mask(unsigned int mask, atomic_t *v) | ||
274 | { | ||
275 | unsigned int vval; | ||
276 | |||
277 | __asm__ __volatile__( | ||
278 | "rsil a15,"__stringify(LOCKLEVEL)"\n\t" | ||
279 | "l32i %0, %2, 0 \n\t" | ||
280 | "or %0, %0, %1 \n\t" | ||
281 | "s32i %0, %2, 0 \n\t" | ||
282 | "wsr a15, "__stringify(PS)" \n\t" | ||
283 | "rsync \n" | ||
284 | : "=&a" (vval) | ||
285 | : "a" (mask), "a" (v) | ||
286 | : "a15", "memory" | ||
287 | ); | ||
288 | } | ||
289 | |||
290 | /* Atomic operations are already serializing */ | ||
291 | #define smp_mb__before_atomic_dec() barrier() | ||
292 | #define smp_mb__after_atomic_dec() barrier() | ||
293 | #define smp_mb__before_atomic_inc() barrier() | ||
294 | #define smp_mb__after_atomic_inc() barrier() | ||
295 | |||
296 | #include <asm-generic/atomic.h> | ||
297 | #endif /* __KERNEL__ */ | ||
298 | |||
299 | #endif /* _XTENSA_ATOMIC_H */ | ||
300 | |||