1 #ifndef _ASM_X86_ATOMIC64_32_H
2 #define _ASM_X86_ATOMIC64_32_H
4 #include <linux/compiler.h>
5 #include <linux/types.h>
6 #include <asm/processor.h>
7 //#include <asm/cmpxchg.h>
9 /* An 64bit atomic type */
12 u64
__aligned(8) counter
;
15 #define ATOMIC64_INIT(val) { (val) }
17 #define __ATOMIC64_DECL(sym) void atomic64_##sym(atomic64_t *, ...)
18 #ifndef ATOMIC64_EXPORT
19 #define ATOMIC64_DECL_ONE __ATOMIC64_DECL
21 #define ATOMIC64_DECL_ONE(sym) __ATOMIC64_DECL(sym); \
22 ATOMIC64_EXPORT(atomic64_##sym)
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)
30 #define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8)
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)
36 #define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8); \
37 ATOMIC64_DECL_ONE(sym##_386)
39 ATOMIC64_DECL_ONE(add_386
);
40 ATOMIC64_DECL_ONE(sub_386
);
41 ATOMIC64_DECL_ONE(inc_386
);
42 ATOMIC64_DECL_ONE(dec_386
);
45 #define alternative_atomic64(f, out, in...) \
46 __alternative_atomic64(f, f, ASM_OUTPUT2(out), ## in)
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
);
60 #undef ATOMIC64_DECL_ONE
61 #undef __ATOMIC64_DECL
62 #undef ATOMIC64_EXPORT
65 * atomic64_cmpxchg - cmpxchg atomic64 variable
66 * @p: pointer to type atomic64_t
70 * Atomically sets @v to @n if it was equal to @o and returns
74 static inline long long atomic64_cmpxchg(atomic64_t
*v
, long long o
, long long n
)
76 return cmpxchg64(&v
->counter
, o
, n
);
80 * atomic64_xchg - xchg atomic64 variable
81 * @v: pointer to type atomic64_t
84 * Atomically xchgs the value of @v to @n and returns
87 static inline long long atomic64_xchg(atomic64_t
*v
, long long n
)
90 unsigned high
= (unsigned)(n
>> 32);
91 unsigned low
= (unsigned)n
;
92 alternative_atomic64(xchg
, "=&A" (o
),
93 "S" (v
), "b" (low
), "c" (high
)
99 * atomic64_set - set atomic64 variable
100 * @v: pointer to type atomic64_t
101 * @n: value to assign
103 * Atomically sets the value of @v to @n.
105 static inline void atomic64_set(atomic64_t
*v
, long long i
)
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");
115 * atomic64_read - read atomic64 variable
116 * @v: pointer to type atomic64_t
118 * Atomically reads the value of @v and returns it.
120 static inline long long atomic64_read(const atomic64_t
*v
)
123 alternative_atomic64(read
, "=&A" (r
), "c" (v
) : "memory");
128 * atomic64_add_return - add and return
129 * @i: integer value to add
130 * @v: pointer to type atomic64_t
132 * Atomically adds @i to @v and returns @i + *@v
134 static inline long long atomic64_add_return(long long i
, atomic64_t
*v
)
136 alternative_atomic64(add_return
,
137 ASM_OUTPUT2("+A" (i
), "+c" (v
)),
138 ASM_NO_INPUT_CLOBBER("memory"));
143 * Other variants with different arithmetic operators:
145 static inline long long atomic64_sub_return(long long i
, atomic64_t
*v
)
147 alternative_atomic64(sub_return
,
148 ASM_OUTPUT2("+A" (i
), "+c" (v
)),
149 ASM_NO_INPUT_CLOBBER("memory"));
153 static inline long long atomic64_inc_return(atomic64_t
*v
)
156 alternative_atomic64(inc_return
, "=&A" (a
),
157 "S" (v
) : "memory", "ecx");
161 static inline long long atomic64_dec_return(atomic64_t
*v
)
164 alternative_atomic64(dec_return
, "=&A" (a
),
165 "S" (v
) : "memory", "ecx");
170 * atomic64_add - add integer to atomic64 variable
171 * @i: integer value to add
172 * @v: pointer to type atomic64_t
174 * Atomically adds @i to @v.
176 static inline long long atomic64_add(long long i
, atomic64_t
*v
)
178 __alternative_atomic64(add
, add_return
,
179 ASM_OUTPUT2("+A" (i
), "+c" (v
)),
180 ASM_NO_INPUT_CLOBBER("memory"));
185 * atomic64_sub - subtract the atomic64 variable
186 * @i: integer value to subtract
187 * @v: pointer to type atomic64_t
189 * Atomically subtracts @i from @v.
191 static inline long long atomic64_sub(long long i
, atomic64_t
*v
)
193 __alternative_atomic64(sub
, sub_return
,
194 ASM_OUTPUT2("+A" (i
), "+c" (v
)),
195 ASM_NO_INPUT_CLOBBER("memory"));
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
204 * Atomically subtracts @i from @v and returns
205 * true if the result is zero, or false for all
208 static inline int atomic64_sub_and_test(long long i
, atomic64_t
*v
)
210 return atomic64_sub_return(i
, v
) == 0;
214 * atomic64_inc - increment atomic64 variable
215 * @v: pointer to type atomic64_t
217 * Atomically increments @v by 1.
219 static inline void atomic64_inc(atomic64_t
*v
)
221 __alternative_atomic64(inc
, inc_return
, /* no output */,
222 "S" (v
) : "memory", "eax", "ecx", "edx");
226 * atomic64_dec - decrement atomic64 variable
227 * @ptr: pointer to type atomic64_t
229 * Atomically decrements @ptr by 1.
231 static inline void atomic64_dec(atomic64_t
*v
)
233 __alternative_atomic64(dec
, dec_return
, /* no output */,
234 "S" (v
) : "memory", "eax", "ecx", "edx");
238 * atomic64_dec_and_test - decrement and test
239 * @v: pointer to type atomic64_t
241 * Atomically decrements @v by 1 and
242 * returns true if the result is 0, or false for all other
245 static inline int atomic64_dec_and_test(atomic64_t
*v
)
247 return atomic64_dec_return(v
) == 0;
251 * atomic64_inc_and_test - increment and test
252 * @v: pointer to type atomic64_t
254 * Atomically increments @v by 1
255 * and returns true if the result is zero, or false for all
258 static inline int atomic64_inc_and_test(atomic64_t
*v
)
260 return atomic64_inc_return(v
) == 0;
264 * atomic64_add_negative - add and test if negative
265 * @i: integer value to add
266 * @v: pointer to type atomic64_t
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.
272 static inline int atomic64_add_negative(long long i
, atomic64_t
*v
)
274 return atomic64_add_return(i
, v
) < 0;
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.
283 * Atomically adds @a to @v, so long as it was not @u.
284 * Returns non-zero if the add was done, zero otherwise.
286 static inline int atomic64_add_unless(atomic64_t
*v
, long long a
, long long u
)
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
)),
297 static inline int atomic64_inc_not_zero(atomic64_t
*v
)
300 alternative_atomic64(inc_not_zero
, "=&a" (r
),
301 "S" (v
) : "ecx", "edx", "memory");
305 static inline long long atomic64_dec_if_positive(atomic64_t
*v
)
308 alternative_atomic64(dec_if_positive
, "=&A" (r
),
309 "S" (v
) : "ecx", "memory");
313 #undef alternative_atomic64
314 #undef __alternative_atomic64
316 #endif /* _ASM_X86_ATOMIC64_32_H */
This page took 0.058572 seconds and 6 git commands to generate.