1 #ifndef _ASM_X86_ATOMIC64_32_H
2 #define _ASM_X86_ATOMIC64_32_H
3
4 #include <linux/compiler.h>
5 #include <linux/types.h>
6 //#include <asm/cmpxchg.h>
7
8 /* An 64bit atomic type */
9
10 typedef struct {
11 u64 __aligned(8) counter;
12 } atomic64_t;
13
14 #define ATOMIC64_INIT(val) { (val) }
15
16 #define __ATOMIC64_DECL(sym) void atomic64_##sym(atomic64_t *, ...)
17 #ifndef ATOMIC64_EXPORT
18 #define ATOMIC64_DECL_ONE __ATOMIC64_DECL
19 #else
20 #define ATOMIC64_DECL_ONE(sym) __ATOMIC64_DECL(sym); \
21 ATOMIC64_EXPORT(atomic64_##sym)
22 #endif
23
24 #ifdef CONFIG_X86_CMPXCHG64
25 #define __alternative_atomic64(f, g, out, in...) \
26 asm volatile("call %P[func]" \
27 : out : [func] "i" (atomic64_##g##_cx8), ## in)
28
29 #define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8)
30 #else
31 #define __alternative_atomic64(f, g, out, in...) \
32 alternative_call(atomic64_##f##_386, atomic64_##g##_cx8, \
33 X86_FEATURE_CX8, ASM_OUTPUT2(out), ## in)
34
35 #define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8); \
36 ATOMIC64_DECL_ONE(sym##_386)
37
38 ATOMIC64_DECL_ONE(add_386);
39 ATOMIC64_DECL_ONE(sub_386);
40 ATOMIC64_DECL_ONE(inc_386);
41 ATOMIC64_DECL_ONE(dec_386);
42 #endif
43
44 #define alternative_atomic64(f, out, in...) \
45 __alternative_atomic64(f, f, ASM_OUTPUT2(out), ## in)
46
47 ATOMIC64_DECL(read);
48 ATOMIC64_DECL(set);
49 ATOMIC64_DECL(xchg);
50 ATOMIC64_DECL(add_return);
51 ATOMIC64_DECL(sub_return);
52 ATOMIC64_DECL(inc_return);
53 ATOMIC64_DECL(dec_return);
54 ATOMIC64_DECL(dec_if_positive);
55 ATOMIC64_DECL(inc_not_zero);
56 ATOMIC64_DECL(add_unless);
57
58 #undef ATOMIC64_DECL
59 #undef ATOMIC64_DECL_ONE
60 #undef __ATOMIC64_DECL
61 #undef ATOMIC64_EXPORT
62
63 /**
64 * atomic64_cmpxchg - cmpxchg atomic64 variable
65 * @v: pointer to type atomic64_t
66 * @o: expected value
67 * @n: new value
68 *
69 * Atomically sets @v to @n if it was equal to @o and returns
70 * the old value.
71 */
72
atomic64_cmpxchg(atomic64_t * v,long long o,long long n)73 static inline long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n)
74 {
75 return cmpxchg64(&v->counter, o, n);
76 }
77
78 /**
79 * atomic64_xchg - xchg atomic64 variable
80 * @v: pointer to type atomic64_t
81 * @n: value to assign
82 *
83 * Atomically xchgs the value of @v to @n and returns
84 * the old value.
85 */
atomic64_xchg(atomic64_t * v,long long n)86 static inline long long atomic64_xchg(atomic64_t *v, long long n)
87 {
88 long long o;
89 unsigned high = (unsigned)(n >> 32);
90 unsigned low = (unsigned)n;
91 alternative_atomic64(xchg, "=&A" (o),
92 "S" (v), "b" (low), "c" (high)
93 : "memory");
94 return o;
95 }
96
97 /**
98 * atomic64_set - set atomic64 variable
99 * @v: pointer to type atomic64_t
100 * @i: value to assign
101 *
102 * Atomically sets the value of @v to @n.
103 */
atomic64_set(atomic64_t * v,long long i)104 static inline void atomic64_set(atomic64_t *v, long long i)
105 {
106 unsigned high = (unsigned)(i >> 32);
107 unsigned low = (unsigned)i;
108 alternative_atomic64(set, /* no output */,
109 "S" (v), "b" (low), "c" (high)
110 : "eax", "edx", "memory");
111 }
112
113 /**
114 * atomic64_read - read atomic64 variable
115 * @v: pointer to type atomic64_t
116 *
117 * Atomically reads the value of @v and returns it.
118 */
atomic64_read(const atomic64_t * v)119 static inline long long atomic64_read(const atomic64_t *v)
120 {
121 long long r;
122 alternative_atomic64(read, "=&A" (r), "c" (v) : "memory");
123 return r;
124 }
125
126 /**
127 * atomic64_add_return - add and return
128 * @i: integer value to add
129 * @v: pointer to type atomic64_t
130 *
131 * Atomically adds @i to @v and returns @i + *@v
132 */
atomic64_add_return(long long i,atomic64_t * v)133 static inline long long atomic64_add_return(long long i, atomic64_t *v)
134 {
135 alternative_atomic64(add_return,
136 ASM_OUTPUT2("+A" (i), "+c" (v)),
137 ASM_NO_INPUT_CLOBBER("memory"));
138 return i;
139 }
140
141 /*
142 * Other variants with different arithmetic operators:
143 */
atomic64_sub_return(long long i,atomic64_t * v)144 static inline long long atomic64_sub_return(long long i, atomic64_t *v)
145 {
146 alternative_atomic64(sub_return,
147 ASM_OUTPUT2("+A" (i), "+c" (v)),
148 ASM_NO_INPUT_CLOBBER("memory"));
149 return i;
150 }
151
atomic64_inc_return(atomic64_t * v)152 static inline long long atomic64_inc_return(atomic64_t *v)
153 {
154 long long a;
155 alternative_atomic64(inc_return, "=&A" (a),
156 "S" (v) : "memory", "ecx");
157 return a;
158 }
159
atomic64_dec_return(atomic64_t * v)160 static inline long long atomic64_dec_return(atomic64_t *v)
161 {
162 long long a;
163 alternative_atomic64(dec_return, "=&A" (a),
164 "S" (v) : "memory", "ecx");
165 return a;
166 }
167
168 /**
169 * atomic64_add - add integer to atomic64 variable
170 * @i: integer value to add
171 * @v: pointer to type atomic64_t
172 *
173 * Atomically adds @i to @v.
174 */
atomic64_add(long long i,atomic64_t * v)175 static inline long long atomic64_add(long long i, atomic64_t *v)
176 {
177 __alternative_atomic64(add, add_return,
178 ASM_OUTPUT2("+A" (i), "+c" (v)),
179 ASM_NO_INPUT_CLOBBER("memory"));
180 return i;
181 }
182
183 /**
184 * atomic64_sub - subtract the atomic64 variable
185 * @i: integer value to subtract
186 * @v: pointer to type atomic64_t
187 *
188 * Atomically subtracts @i from @v.
189 */
atomic64_sub(long long i,atomic64_t * v)190 static inline long long atomic64_sub(long long i, atomic64_t *v)
191 {
192 __alternative_atomic64(sub, sub_return,
193 ASM_OUTPUT2("+A" (i), "+c" (v)),
194 ASM_NO_INPUT_CLOBBER("memory"));
195 return i;
196 }
197
198 /**
199 * atomic64_sub_and_test - subtract value from variable and test result
200 * @i: integer value to subtract
201 * @v: pointer to type atomic64_t
202 *
203 * Atomically subtracts @i from @v and returns
204 * true if the result is zero, or false for all
205 * other cases.
206 */
atomic64_sub_and_test(long long i,atomic64_t * v)207 static inline int atomic64_sub_and_test(long long i, atomic64_t *v)
208 {
209 return atomic64_sub_return(i, v) == 0;
210 }
211
212 /**
213 * atomic64_inc - increment atomic64 variable
214 * @v: pointer to type atomic64_t
215 *
216 * Atomically increments @v by 1.
217 */
atomic64_inc(atomic64_t * v)218 static inline void atomic64_inc(atomic64_t *v)
219 {
220 __alternative_atomic64(inc, inc_return, /* no output */,
221 "S" (v) : "memory", "eax", "ecx", "edx");
222 }
223
224 /**
225 * atomic64_dec - decrement atomic64 variable
226 * @v: pointer to type atomic64_t
227 *
228 * Atomically decrements @v by 1.
229 */
atomic64_dec(atomic64_t * v)230 static inline void atomic64_dec(atomic64_t *v)
231 {
232 __alternative_atomic64(dec, dec_return, /* no output */,
233 "S" (v) : "memory", "eax", "ecx", "edx");
234 }
235
236 /**
237 * atomic64_dec_and_test - decrement and test
238 * @v: pointer to type atomic64_t
239 *
240 * Atomically decrements @v by 1 and
241 * returns true if the result is 0, or false for all other
242 * cases.
243 */
atomic64_dec_and_test(atomic64_t * v)244 static inline int atomic64_dec_and_test(atomic64_t *v)
245 {
246 return atomic64_dec_return(v) == 0;
247 }
248
249 /**
250 * atomic64_inc_and_test - increment and test
251 * @v: pointer to type atomic64_t
252 *
253 * Atomically increments @v by 1
254 * and returns true if the result is zero, or false for all
255 * other cases.
256 */
atomic64_inc_and_test(atomic64_t * v)257 static inline int atomic64_inc_and_test(atomic64_t *v)
258 {
259 return atomic64_inc_return(v) == 0;
260 }
261
262 /**
263 * atomic64_add_negative - add and test if negative
264 * @i: integer value to add
265 * @v: pointer to type atomic64_t
266 *
267 * Atomically adds @i to @v and returns true
268 * if the result is negative, or false when
269 * result is greater than or equal to zero.
270 */
atomic64_add_negative(long long i,atomic64_t * v)271 static inline int atomic64_add_negative(long long i, atomic64_t *v)
272 {
273 return atomic64_add_return(i, v) < 0;
274 }
275
276 /**
277 * atomic64_add_unless - add unless the number is a given value
278 * @v: pointer of type atomic64_t
279 * @a: the amount to add to v...
280 * @u: ...unless v is equal to u.
281 *
282 * Atomically adds @a to @v, so long as it was not @u.
283 * Returns non-zero if the add was done, zero otherwise.
284 */
atomic64_add_unless(atomic64_t * v,long long a,long long u)285 static inline int atomic64_add_unless(atomic64_t *v, long long a, long long u)
286 {
287 unsigned low = (unsigned)u;
288 unsigned high = (unsigned)(u >> 32);
289 alternative_atomic64(add_unless,
290 ASM_OUTPUT2("+A" (a), "+c" (low), "+D" (high)),
291 "S" (v) : "memory");
292 return (int)a;
293 }
294
295
atomic64_inc_not_zero(atomic64_t * v)296 static inline int atomic64_inc_not_zero(atomic64_t *v)
297 {
298 int r;
299 alternative_atomic64(inc_not_zero, "=&a" (r),
300 "S" (v) : "ecx", "edx", "memory");
301 return r;
302 }
303
atomic64_dec_if_positive(atomic64_t * v)304 static inline long long atomic64_dec_if_positive(atomic64_t *v)
305 {
306 long long r;
307 alternative_atomic64(dec_if_positive, "=&A" (r),
308 "S" (v) : "ecx", "memory");
309 return r;
310 }
311
312 #undef alternative_atomic64
313 #undef __alternative_atomic64
314
315 #define ATOMIC64_OP(op, c_op) \
316 static inline void atomic64_##op(long long i, atomic64_t *v) \
317 { \
318 long long old, c = 0; \
319 while ((old = atomic64_cmpxchg(v, c, c c_op i)) != c) \
320 c = old; \
321 }
322
323 ATOMIC64_OP(and, &)
324 ATOMIC64_OP(or, |)
325 ATOMIC64_OP(xor, ^)
326
327 #undef ATOMIC64_OP
328
329 #endif /* _ASM_X86_ATOMIC64_32_H */
330