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Linux/arch/x86/include/asm/atomic64_32.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _ASM_X86_ATOMIC64_32_H
  3 #define _ASM_X86_ATOMIC64_32_H
  4 
  5 #include <linux/compiler.h>
  6 #include <linux/types.h>
  7 //#include <asm/cmpxchg.h>
  8 
  9 /* An 64bit atomic type */
 10 
 11 typedef struct {
 12         u64 __aligned(8) counter;
 13 } atomic64_t;
 14 
 15 #define ATOMIC64_INIT(val)      { (val) }
 16 
 17 #define __ATOMIC64_DECL(sym) void atomic64_##sym(atomic64_t *, ...)
 18 #ifndef ATOMIC64_EXPORT
 19 #define ATOMIC64_DECL_ONE __ATOMIC64_DECL
 20 #else
 21 #define ATOMIC64_DECL_ONE(sym) __ATOMIC64_DECL(sym); \
 22         ATOMIC64_EXPORT(atomic64_##sym)
 23 #endif
 24 
 25 #ifdef CONFIG_X86_CMPXCHG64
 26 #define __alternative_atomic64(f, g, out, in...) \
 27         asm volatile("call %P[func]" \
 28                      : out : [func] "i" (atomic64_##g##_cx8), ## in)
 29 
 30 #define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8)
 31 #else
 32 #define __alternative_atomic64(f, g, out, in...) \
 33         alternative_call(atomic64_##f##_386, atomic64_##g##_cx8, \
 34                          X86_FEATURE_CX8, ASM_OUTPUT2(out), ## in)
 35 
 36 #define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8); \
 37         ATOMIC64_DECL_ONE(sym##_386)
 38 
 39 ATOMIC64_DECL_ONE(add_386);
 40 ATOMIC64_DECL_ONE(sub_386);
 41 ATOMIC64_DECL_ONE(inc_386);
 42 ATOMIC64_DECL_ONE(dec_386);
 43 #endif
 44 
 45 #define alternative_atomic64(f, out, in...) \
 46         __alternative_atomic64(f, f, ASM_OUTPUT2(out), ## in)
 47 
 48 ATOMIC64_DECL(read);
 49 ATOMIC64_DECL(set);
 50 ATOMIC64_DECL(xchg);
 51 ATOMIC64_DECL(add_return);
 52 ATOMIC64_DECL(sub_return);
 53 ATOMIC64_DECL(inc_return);
 54 ATOMIC64_DECL(dec_return);
 55 ATOMIC64_DECL(dec_if_positive);
 56 ATOMIC64_DECL(inc_not_zero);
 57 ATOMIC64_DECL(add_unless);
 58 
 59 #undef ATOMIC64_DECL
 60 #undef ATOMIC64_DECL_ONE
 61 #undef __ATOMIC64_DECL
 62 #undef ATOMIC64_EXPORT
 63 
 64 /**
 65  * atomic64_cmpxchg - cmpxchg atomic64 variable
 66  * @v: pointer to type atomic64_t
 67  * @o: expected value
 68  * @n: new value
 69  *
 70  * Atomically sets @v to @n if it was equal to @o and returns
 71  * the old value.
 72  */
 73 
 74 static inline long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n)
 75 {
 76         return cmpxchg64(&v->counter, o, n);
 77 }
 78 
 79 /**
 80  * atomic64_xchg - xchg atomic64 variable
 81  * @v: pointer to type atomic64_t
 82  * @n: value to assign
 83  *
 84  * Atomically xchgs the value of @v to @n and returns
 85  * the old value.
 86  */
 87 static inline long long atomic64_xchg(atomic64_t *v, long long n)
 88 {
 89         long long o;
 90         unsigned high = (unsigned)(n >> 32);
 91         unsigned low = (unsigned)n;
 92         alternative_atomic64(xchg, "=&A" (o),
 93                              "S" (v), "b" (low), "c" (high)
 94                              : "memory");
 95         return o;
 96 }
 97 
 98 /**
 99  * atomic64_set - set atomic64 variable
100  * @v: pointer to type atomic64_t
101  * @i: value to assign
102  *
103  * Atomically sets the value of @v to @n.
104  */
105 static inline void atomic64_set(atomic64_t *v, long long i)
106 {
107         unsigned high = (unsigned)(i >> 32);
108         unsigned low = (unsigned)i;
109         alternative_atomic64(set, /* no output */,
110                              "S" (v), "b" (low), "c" (high)
111                              : "eax", "edx", "memory");
112 }
113 
114 /**
115  * atomic64_read - read atomic64 variable
116  * @v: pointer to type atomic64_t
117  *
118  * Atomically reads the value of @v and returns it.
119  */
120 static inline long long atomic64_read(const atomic64_t *v)
121 {
122         long long r;
123         alternative_atomic64(read, "=&A" (r), "c" (v) : "memory");
124         return r;
125  }
126 
127 /**
128  * atomic64_add_return - add and return
129  * @i: integer value to add
130  * @v: pointer to type atomic64_t
131  *
132  * Atomically adds @i to @v and returns @i + *@v
133  */
134 static inline long long atomic64_add_return(long long i, atomic64_t *v)
135 {
136         alternative_atomic64(add_return,
137                              ASM_OUTPUT2("+A" (i), "+c" (v)),
138                              ASM_NO_INPUT_CLOBBER("memory"));
139         return i;
140 }
141 
142 /*
143  * Other variants with different arithmetic operators:
144  */
145 static inline long long atomic64_sub_return(long long i, atomic64_t *v)
146 {
147         alternative_atomic64(sub_return,
148                              ASM_OUTPUT2("+A" (i), "+c" (v)),
149                              ASM_NO_INPUT_CLOBBER("memory"));
150         return i;
151 }
152 
153 static inline long long atomic64_inc_return(atomic64_t *v)
154 {
155         long long a;
156         alternative_atomic64(inc_return, "=&A" (a),
157                              "S" (v) : "memory", "ecx");
158         return a;
159 }
160 
161 static inline long long atomic64_dec_return(atomic64_t *v)
162 {
163         long long a;
164         alternative_atomic64(dec_return, "=&A" (a),
165                              "S" (v) : "memory", "ecx");
166         return a;
167 }
168 
169 /**
170  * atomic64_add - add integer to atomic64 variable
171  * @i: integer value to add
172  * @v: pointer to type atomic64_t
173  *
174  * Atomically adds @i to @v.
175  */
176 static inline long long atomic64_add(long long i, atomic64_t *v)
177 {
178         __alternative_atomic64(add, add_return,
179                                ASM_OUTPUT2("+A" (i), "+c" (v)),
180                                ASM_NO_INPUT_CLOBBER("memory"));
181         return i;
182 }
183 
184 /**
185  * atomic64_sub - subtract the atomic64 variable
186  * @i: integer value to subtract
187  * @v: pointer to type atomic64_t
188  *
189  * Atomically subtracts @i from @v.
190  */
191 static inline long long atomic64_sub(long long i, atomic64_t *v)
192 {
193         __alternative_atomic64(sub, sub_return,
194                                ASM_OUTPUT2("+A" (i), "+c" (v)),
195                                ASM_NO_INPUT_CLOBBER("memory"));
196         return i;
197 }
198 
199 /**
200  * atomic64_sub_and_test - subtract value from variable and test result
201  * @i: integer value to subtract
202  * @v: pointer to type atomic64_t
203  *
204  * Atomically subtracts @i from @v and returns
205  * true if the result is zero, or false for all
206  * other cases.
207  */
208 static inline int atomic64_sub_and_test(long long i, atomic64_t *v)
209 {
210         return atomic64_sub_return(i, v) == 0;
211 }
212 
213 /**
214  * atomic64_inc - increment atomic64 variable
215  * @v: pointer to type atomic64_t
216  *
217  * Atomically increments @v by 1.
218  */
219 static inline void atomic64_inc(atomic64_t *v)
220 {
221         __alternative_atomic64(inc, inc_return, /* no output */,
222                                "S" (v) : "memory", "eax", "ecx", "edx");
223 }
224 
225 /**
226  * atomic64_dec - decrement atomic64 variable
227  * @v: pointer to type atomic64_t
228  *
229  * Atomically decrements @v by 1.
230  */
231 static inline void atomic64_dec(atomic64_t *v)
232 {
233         __alternative_atomic64(dec, dec_return, /* no output */,
234                                "S" (v) : "memory", "eax", "ecx", "edx");
235 }
236 
237 /**
238  * atomic64_dec_and_test - decrement and test
239  * @v: pointer to type atomic64_t
240  *
241  * Atomically decrements @v by 1 and
242  * returns true if the result is 0, or false for all other
243  * cases.
244  */
245 static inline int atomic64_dec_and_test(atomic64_t *v)
246 {
247         return atomic64_dec_return(v) == 0;
248 }
249 
250 /**
251  * atomic64_inc_and_test - increment and test
252  * @v: pointer to type atomic64_t
253  *
254  * Atomically increments @v by 1
255  * and returns true if the result is zero, or false for all
256  * other cases.
257  */
258 static inline int atomic64_inc_and_test(atomic64_t *v)
259 {
260         return atomic64_inc_return(v) == 0;
261 }
262 
263 /**
264  * atomic64_add_negative - add and test if negative
265  * @i: integer value to add
266  * @v: pointer to type atomic64_t
267  *
268  * Atomically adds @i to @v and returns true
269  * if the result is negative, or false when
270  * result is greater than or equal to zero.
271  */
272 static inline int atomic64_add_negative(long long i, atomic64_t *v)
273 {
274         return atomic64_add_return(i, v) < 0;
275 }
276 
277 /**
278  * atomic64_add_unless - add unless the number is a given value
279  * @v: pointer of type atomic64_t
280  * @a: the amount to add to v...
281  * @u: ...unless v is equal to u.
282  *
283  * Atomically adds @a to @v, so long as it was not @u.
284  * Returns non-zero if the add was done, zero otherwise.
285  */
286 static inline int atomic64_add_unless(atomic64_t *v, long long a, long long u)
287 {
288         unsigned low = (unsigned)u;
289         unsigned high = (unsigned)(u >> 32);
290         alternative_atomic64(add_unless,
291                              ASM_OUTPUT2("+A" (a), "+c" (low), "+D" (high)),
292                              "S" (v) : "memory");
293         return (int)a;
294 }
295 
296 
297 static inline int atomic64_inc_not_zero(atomic64_t *v)
298 {
299         int r;
300         alternative_atomic64(inc_not_zero, "=&a" (r),
301                              "S" (v) : "ecx", "edx", "memory");
302         return r;
303 }
304 
305 static inline long long atomic64_dec_if_positive(atomic64_t *v)
306 {
307         long long r;
308         alternative_atomic64(dec_if_positive, "=&A" (r),
309                              "S" (v) : "ecx", "memory");
310         return r;
311 }
312 
313 #undef alternative_atomic64
314 #undef __alternative_atomic64
315 
316 static inline void atomic64_and(long long i, atomic64_t *v)
317 {
318         long long old, c = 0;
319 
320         while ((old = atomic64_cmpxchg(v, c, c & i)) != c)
321                 c = old;
322 }
323 
324 static inline long long atomic64_fetch_and(long long i, atomic64_t *v)
325 {
326         long long old, c = 0;
327 
328         while ((old = atomic64_cmpxchg(v, c, c & i)) != c)
329                 c = old;
330 
331         return old;
332 }
333 
334 static inline void atomic64_or(long long i, atomic64_t *v)
335 {
336         long long old, c = 0;
337 
338         while ((old = atomic64_cmpxchg(v, c, c | i)) != c)
339                 c = old;
340 }
341 
342 static inline long long atomic64_fetch_or(long long i, atomic64_t *v)
343 {
344         long long old, c = 0;
345 
346         while ((old = atomic64_cmpxchg(v, c, c | i)) != c)
347                 c = old;
348 
349         return old;
350 }
351 
352 static inline void atomic64_xor(long long i, atomic64_t *v)
353 {
354         long long old, c = 0;
355 
356         while ((old = atomic64_cmpxchg(v, c, c ^ i)) != c)
357                 c = old;
358 }
359 
360 static inline long long atomic64_fetch_xor(long long i, atomic64_t *v)
361 {
362         long long old, c = 0;
363 
364         while ((old = atomic64_cmpxchg(v, c, c ^ i)) != c)
365                 c = old;
366 
367         return old;
368 }
369 
370 static inline long long atomic64_fetch_add(long long i, atomic64_t *v)
371 {
372         long long old, c = 0;
373 
374         while ((old = atomic64_cmpxchg(v, c, c + i)) != c)
375                 c = old;
376 
377         return old;
378 }
379 
380 #define atomic64_fetch_sub(i, v)        atomic64_fetch_add(-(i), (v))
381 
382 #endif /* _ASM_X86_ATOMIC64_32_H */
383 

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