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1da177e4 LT |
1 | #ifndef __ARCH_X86_64_ATOMIC__ |
2 | #define __ARCH_X86_64_ATOMIC__ | |
3 | ||
4 | #include <linux/config.h> | |
99f7b77d | 5 | #include <asm/types.h> |
1da177e4 LT |
6 | |
7 | /* atomic_t should be 32 bit signed type */ | |
8 | ||
9 | /* | |
10 | * Atomic operations that C can't guarantee us. Useful for | |
11 | * resource counting etc.. | |
12 | */ | |
13 | ||
14 | #ifdef CONFIG_SMP | |
15 | #define LOCK "lock ; " | |
16 | #else | |
17 | #define LOCK "" | |
18 | #endif | |
19 | ||
20 | /* | |
21 | * Make sure gcc doesn't try to be clever and move things around | |
22 | * on us. We need to use _exactly_ the address the user gave us, | |
23 | * not some alias that contains the same information. | |
24 | */ | |
25 | typedef struct { volatile int counter; } atomic_t; | |
26 | ||
27 | #define ATOMIC_INIT(i) { (i) } | |
28 | ||
29 | /** | |
30 | * atomic_read - read atomic variable | |
31 | * @v: pointer of type atomic_t | |
32 | * | |
33 | * Atomically reads the value of @v. | |
34 | */ | |
35 | #define atomic_read(v) ((v)->counter) | |
36 | ||
37 | /** | |
38 | * atomic_set - set atomic variable | |
39 | * @v: pointer of type atomic_t | |
40 | * @i: required value | |
41 | * | |
42 | * Atomically sets the value of @v to @i. | |
43 | */ | |
44 | #define atomic_set(v,i) (((v)->counter) = (i)) | |
45 | ||
46 | /** | |
47 | * atomic_add - add integer to atomic variable | |
48 | * @i: integer value to add | |
49 | * @v: pointer of type atomic_t | |
50 | * | |
51 | * Atomically adds @i to @v. | |
52 | */ | |
53 | static __inline__ void atomic_add(int i, atomic_t *v) | |
54 | { | |
55 | __asm__ __volatile__( | |
56 | LOCK "addl %1,%0" | |
57 | :"=m" (v->counter) | |
58 | :"ir" (i), "m" (v->counter)); | |
59 | } | |
60 | ||
61 | /** | |
62 | * atomic_sub - subtract the atomic variable | |
63 | * @i: integer value to subtract | |
64 | * @v: pointer of type atomic_t | |
65 | * | |
66 | * Atomically subtracts @i from @v. | |
67 | */ | |
68 | static __inline__ void atomic_sub(int i, atomic_t *v) | |
69 | { | |
70 | __asm__ __volatile__( | |
71 | LOCK "subl %1,%0" | |
72 | :"=m" (v->counter) | |
73 | :"ir" (i), "m" (v->counter)); | |
74 | } | |
75 | ||
76 | /** | |
77 | * atomic_sub_and_test - subtract value from variable and test result | |
78 | * @i: integer value to subtract | |
79 | * @v: pointer of type atomic_t | |
80 | * | |
81 | * Atomically subtracts @i from @v and returns | |
82 | * true if the result is zero, or false for all | |
83 | * other cases. | |
84 | */ | |
85 | static __inline__ int atomic_sub_and_test(int i, atomic_t *v) | |
86 | { | |
87 | unsigned char c; | |
88 | ||
89 | __asm__ __volatile__( | |
90 | LOCK "subl %2,%0; sete %1" | |
91 | :"=m" (v->counter), "=qm" (c) | |
92 | :"ir" (i), "m" (v->counter) : "memory"); | |
93 | return c; | |
94 | } | |
95 | ||
96 | /** | |
97 | * atomic_inc - increment atomic variable | |
98 | * @v: pointer of type atomic_t | |
99 | * | |
100 | * Atomically increments @v by 1. | |
101 | */ | |
102 | static __inline__ void atomic_inc(atomic_t *v) | |
103 | { | |
104 | __asm__ __volatile__( | |
105 | LOCK "incl %0" | |
106 | :"=m" (v->counter) | |
107 | :"m" (v->counter)); | |
108 | } | |
109 | ||
110 | /** | |
111 | * atomic_dec - decrement atomic variable | |
112 | * @v: pointer of type atomic_t | |
113 | * | |
114 | * Atomically decrements @v by 1. | |
115 | */ | |
116 | static __inline__ void atomic_dec(atomic_t *v) | |
117 | { | |
118 | __asm__ __volatile__( | |
119 | LOCK "decl %0" | |
120 | :"=m" (v->counter) | |
121 | :"m" (v->counter)); | |
122 | } | |
123 | ||
124 | /** | |
125 | * atomic_dec_and_test - decrement and test | |
126 | * @v: pointer of type atomic_t | |
127 | * | |
128 | * Atomically decrements @v by 1 and | |
129 | * returns true if the result is 0, or false for all other | |
130 | * cases. | |
131 | */ | |
132 | static __inline__ int atomic_dec_and_test(atomic_t *v) | |
133 | { | |
134 | unsigned char c; | |
135 | ||
136 | __asm__ __volatile__( | |
137 | LOCK "decl %0; sete %1" | |
138 | :"=m" (v->counter), "=qm" (c) | |
139 | :"m" (v->counter) : "memory"); | |
140 | return c != 0; | |
141 | } | |
142 | ||
143 | /** | |
144 | * atomic_inc_and_test - increment and test | |
145 | * @v: pointer of type atomic_t | |
146 | * | |
147 | * Atomically increments @v by 1 | |
148 | * and returns true if the result is zero, or false for all | |
149 | * other cases. | |
150 | */ | |
151 | static __inline__ int atomic_inc_and_test(atomic_t *v) | |
152 | { | |
153 | unsigned char c; | |
154 | ||
155 | __asm__ __volatile__( | |
156 | LOCK "incl %0; sete %1" | |
157 | :"=m" (v->counter), "=qm" (c) | |
158 | :"m" (v->counter) : "memory"); | |
159 | return c != 0; | |
160 | } | |
161 | ||
162 | /** | |
163 | * atomic_add_negative - add and test if negative | |
1da177e4 | 164 | * @i: integer value to add |
7c72aaf2 | 165 | * @v: pointer of type atomic_t |
1da177e4 LT |
166 | * |
167 | * Atomically adds @i to @v and returns true | |
168 | * if the result is negative, or false when | |
169 | * result is greater than or equal to zero. | |
170 | */ | |
171 | static __inline__ int atomic_add_negative(int i, atomic_t *v) | |
172 | { | |
173 | unsigned char c; | |
174 | ||
175 | __asm__ __volatile__( | |
176 | LOCK "addl %2,%0; sets %1" | |
177 | :"=m" (v->counter), "=qm" (c) | |
178 | :"ir" (i), "m" (v->counter) : "memory"); | |
179 | return c; | |
180 | } | |
181 | ||
7c72aaf2 HD |
182 | /** |
183 | * atomic_add_return - add and return | |
184 | * @i: integer value to add | |
185 | * @v: pointer of type atomic_t | |
186 | * | |
187 | * Atomically adds @i to @v and returns @i + @v | |
188 | */ | |
189 | static __inline__ int atomic_add_return(int i, atomic_t *v) | |
190 | { | |
191 | int __i = i; | |
192 | __asm__ __volatile__( | |
193 | LOCK "xaddl %0, %1;" | |
194 | :"=r"(i) | |
195 | :"m"(v->counter), "0"(i)); | |
196 | return i + __i; | |
197 | } | |
198 | ||
199 | static __inline__ int atomic_sub_return(int i, atomic_t *v) | |
200 | { | |
201 | return atomic_add_return(-i,v); | |
202 | } | |
203 | ||
204 | #define atomic_inc_return(v) (atomic_add_return(1,v)) | |
205 | #define atomic_dec_return(v) (atomic_sub_return(1,v)) | |
206 | ||
1da177e4 LT |
207 | /* An 64bit atomic type */ |
208 | ||
209 | typedef struct { volatile long counter; } atomic64_t; | |
210 | ||
211 | #define ATOMIC64_INIT(i) { (i) } | |
212 | ||
213 | /** | |
214 | * atomic64_read - read atomic64 variable | |
215 | * @v: pointer of type atomic64_t | |
216 | * | |
217 | * Atomically reads the value of @v. | |
218 | * Doesn't imply a read memory barrier. | |
219 | */ | |
220 | #define atomic64_read(v) ((v)->counter) | |
221 | ||
222 | /** | |
223 | * atomic64_set - set atomic64 variable | |
224 | * @v: pointer to type atomic64_t | |
225 | * @i: required value | |
226 | * | |
227 | * Atomically sets the value of @v to @i. | |
228 | */ | |
229 | #define atomic64_set(v,i) (((v)->counter) = (i)) | |
230 | ||
231 | /** | |
232 | * atomic64_add - add integer to atomic64 variable | |
233 | * @i: integer value to add | |
234 | * @v: pointer to type atomic64_t | |
235 | * | |
236 | * Atomically adds @i to @v. | |
237 | */ | |
238 | static __inline__ void atomic64_add(long i, atomic64_t *v) | |
239 | { | |
240 | __asm__ __volatile__( | |
241 | LOCK "addq %1,%0" | |
242 | :"=m" (v->counter) | |
243 | :"ir" (i), "m" (v->counter)); | |
244 | } | |
245 | ||
246 | /** | |
247 | * atomic64_sub - subtract the atomic64 variable | |
248 | * @i: integer value to subtract | |
249 | * @v: pointer to type atomic64_t | |
250 | * | |
251 | * Atomically subtracts @i from @v. | |
252 | */ | |
253 | static __inline__ void atomic64_sub(long i, atomic64_t *v) | |
254 | { | |
255 | __asm__ __volatile__( | |
256 | LOCK "subq %1,%0" | |
257 | :"=m" (v->counter) | |
258 | :"ir" (i), "m" (v->counter)); | |
259 | } | |
260 | ||
261 | /** | |
262 | * atomic64_sub_and_test - subtract value from variable and test result | |
263 | * @i: integer value to subtract | |
264 | * @v: pointer to type atomic64_t | |
265 | * | |
266 | * Atomically subtracts @i from @v and returns | |
267 | * true if the result is zero, or false for all | |
268 | * other cases. | |
269 | */ | |
270 | static __inline__ int atomic64_sub_and_test(long i, atomic64_t *v) | |
271 | { | |
272 | unsigned char c; | |
273 | ||
274 | __asm__ __volatile__( | |
275 | LOCK "subq %2,%0; sete %1" | |
276 | :"=m" (v->counter), "=qm" (c) | |
277 | :"ir" (i), "m" (v->counter) : "memory"); | |
278 | return c; | |
279 | } | |
280 | ||
281 | /** | |
282 | * atomic64_inc - increment atomic64 variable | |
283 | * @v: pointer to type atomic64_t | |
284 | * | |
285 | * Atomically increments @v by 1. | |
286 | */ | |
287 | static __inline__ void atomic64_inc(atomic64_t *v) | |
288 | { | |
289 | __asm__ __volatile__( | |
290 | LOCK "incq %0" | |
291 | :"=m" (v->counter) | |
292 | :"m" (v->counter)); | |
293 | } | |
294 | ||
295 | /** | |
296 | * atomic64_dec - decrement atomic64 variable | |
297 | * @v: pointer to type atomic64_t | |
298 | * | |
299 | * Atomically decrements @v by 1. | |
300 | */ | |
301 | static __inline__ void atomic64_dec(atomic64_t *v) | |
302 | { | |
303 | __asm__ __volatile__( | |
304 | LOCK "decq %0" | |
305 | :"=m" (v->counter) | |
306 | :"m" (v->counter)); | |
307 | } | |
308 | ||
309 | /** | |
310 | * atomic64_dec_and_test - decrement and test | |
311 | * @v: pointer to type atomic64_t | |
312 | * | |
313 | * Atomically decrements @v by 1 and | |
314 | * returns true if the result is 0, or false for all other | |
315 | * cases. | |
316 | */ | |
317 | static __inline__ int atomic64_dec_and_test(atomic64_t *v) | |
318 | { | |
319 | unsigned char c; | |
320 | ||
321 | __asm__ __volatile__( | |
322 | LOCK "decq %0; sete %1" | |
323 | :"=m" (v->counter), "=qm" (c) | |
324 | :"m" (v->counter) : "memory"); | |
325 | return c != 0; | |
326 | } | |
327 | ||
328 | /** | |
329 | * atomic64_inc_and_test - increment and test | |
330 | * @v: pointer to type atomic64_t | |
331 | * | |
332 | * Atomically increments @v by 1 | |
333 | * and returns true if the result is zero, or false for all | |
334 | * other cases. | |
335 | */ | |
336 | static __inline__ int atomic64_inc_and_test(atomic64_t *v) | |
337 | { | |
338 | unsigned char c; | |
339 | ||
340 | __asm__ __volatile__( | |
341 | LOCK "incq %0; sete %1" | |
342 | :"=m" (v->counter), "=qm" (c) | |
343 | :"m" (v->counter) : "memory"); | |
344 | return c != 0; | |
345 | } | |
346 | ||
347 | /** | |
348 | * atomic64_add_negative - add and test if negative | |
1da177e4 | 349 | * @i: integer value to add |
7c72aaf2 | 350 | * @v: pointer to type atomic64_t |
1da177e4 LT |
351 | * |
352 | * Atomically adds @i to @v and returns true | |
353 | * if the result is negative, or false when | |
354 | * result is greater than or equal to zero. | |
355 | */ | |
7c72aaf2 | 356 | static __inline__ int atomic64_add_negative(long i, atomic64_t *v) |
1da177e4 LT |
357 | { |
358 | unsigned char c; | |
359 | ||
360 | __asm__ __volatile__( | |
361 | LOCK "addq %2,%0; sets %1" | |
362 | :"=m" (v->counter), "=qm" (c) | |
363 | :"ir" (i), "m" (v->counter) : "memory"); | |
364 | return c; | |
365 | } | |
366 | ||
367 | /** | |
7c72aaf2 | 368 | * atomic64_add_return - add and return |
1da177e4 | 369 | * @i: integer value to add |
7c72aaf2 | 370 | * @v: pointer to type atomic64_t |
1da177e4 LT |
371 | * |
372 | * Atomically adds @i to @v and returns @i + @v | |
373 | */ | |
7c72aaf2 | 374 | static __inline__ long atomic64_add_return(long i, atomic64_t *v) |
1da177e4 | 375 | { |
7c72aaf2 | 376 | long __i = i; |
1da177e4 | 377 | __asm__ __volatile__( |
7c72aaf2 | 378 | LOCK "xaddq %0, %1;" |
1da177e4 LT |
379 | :"=r"(i) |
380 | :"m"(v->counter), "0"(i)); | |
381 | return i + __i; | |
382 | } | |
383 | ||
7c72aaf2 | 384 | static __inline__ long atomic64_sub_return(long i, atomic64_t *v) |
1da177e4 | 385 | { |
7c72aaf2 | 386 | return atomic64_add_return(-i,v); |
1da177e4 LT |
387 | } |
388 | ||
7c72aaf2 HD |
389 | #define atomic64_inc_return(v) (atomic64_add_return(1,v)) |
390 | #define atomic64_dec_return(v) (atomic64_sub_return(1,v)) | |
391 | ||
4a6dae6d | 392 | #define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new)) |
ffbf670f | 393 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
4a6dae6d | 394 | |
8426e1f6 NP |
395 | /** |
396 | * atomic_add_unless - add unless the number is a given value | |
397 | * @v: pointer of type atomic_t | |
398 | * @a: the amount to add to v... | |
399 | * @u: ...unless v is equal to u. | |
400 | * | |
401 | * Atomically adds @a to @v, so long as it was not @u. | |
402 | * Returns non-zero if @v was not @u, and zero otherwise. | |
403 | */ | |
404 | #define atomic_add_unless(v, a, u) \ | |
405 | ({ \ | |
406 | int c, old; \ | |
407 | c = atomic_read(v); \ | |
408 | while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \ | |
409 | c = old; \ | |
410 | c != (u); \ | |
411 | }) | |
412 | #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) | |
413 | ||
1da177e4 LT |
414 | /* These are x86-specific, used by some header files */ |
415 | #define atomic_clear_mask(mask, addr) \ | |
416 | __asm__ __volatile__(LOCK "andl %0,%1" \ | |
417 | : : "r" (~(mask)),"m" (*addr) : "memory") | |
418 | ||
419 | #define atomic_set_mask(mask, addr) \ | |
420 | __asm__ __volatile__(LOCK "orl %0,%1" \ | |
421 | : : "r" ((unsigned)mask),"m" (*(addr)) : "memory") | |
422 | ||
423 | /* Atomic operations are already serializing on x86 */ | |
424 | #define smp_mb__before_atomic_dec() barrier() | |
425 | #define smp_mb__after_atomic_dec() barrier() | |
426 | #define smp_mb__before_atomic_inc() barrier() | |
427 | #define smp_mb__after_atomic_inc() barrier() | |
428 | ||
715b49ef AC |
429 | /* ECC atomic, DMA, SMP and interrupt safe scrub function */ |
430 | ||
431 | static __inline__ void atomic_scrub(u32 *virt_addr, u32 size) | |
432 | { | |
433 | u32 i; | |
434 | for (i = 0; i < size / 4; i++, virt_addr++) | |
435 | /* Very carefully read and write to memory atomically | |
436 | * so we are interrupt, DMA and SMP safe. | |
437 | */ | |
438 | __asm__ __volatile__("lock; addl $0, %0"::"m"(*virt_addr)); | |
439 | } | |
440 | ||
d3cb4871 | 441 | #include <asm-generic/atomic.h> |
1da177e4 | 442 | #endif |