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 #ifdef CONFIG_X86_CMPXCHG64
18 #define ATOMIC64_ALTERNATIVE_(f, g) "call atomic64_" #g "_cx8"
20 #define ATOMIC64_ALTERNATIVE_(f, g) ALTERNATIVE("call atomic64_" #f "_386", "call atomic64_" #g "_cx8", X86_FEATURE_CX8)
23 #define ATOMIC64_ALTERNATIVE(f) ATOMIC64_ALTERNATIVE_(f, f)
26 * atomic64_cmpxchg - cmpxchg atomic64 variable
27 * @p: pointer to type atomic64_t
31 * Atomically sets @v to @n if it was equal to @o and returns
35 static inline long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n)
37 return cmpxchg64(&v->counter, o, n);
41 * atomic64_xchg - xchg atomic64 variable
42 * @v: pointer to type atomic64_t
45 * Atomically xchgs the value of @v to @n and returns
48 static inline long long atomic64_xchg(atomic64_t *v, long long n)
51 unsigned high = (unsigned)(n >> 32);
52 unsigned low = (unsigned)n;
53 asm volatile(ATOMIC64_ALTERNATIVE(xchg)
54 : "=A" (o), "+b" (low), "+c" (high)
62 * atomic64_set - set atomic64 variable
63 * @v: pointer to type atomic64_t
66 * Atomically sets the value of @v to @n.
68 static inline void atomic64_set(atomic64_t *v, long long i)
70 unsigned high = (unsigned)(i >> 32);
71 unsigned low = (unsigned)i;
72 asm volatile(ATOMIC64_ALTERNATIVE(set)
73 : "+b" (low), "+c" (high)
75 : "eax", "edx", "memory"
80 * atomic64_read - read atomic64 variable
81 * @v: pointer to type atomic64_t
83 * Atomically reads the value of @v and returns it.
85 static inline long long atomic64_read(atomic64_t *v)
88 asm volatile(ATOMIC64_ALTERNATIVE(read)
96 * atomic64_add_return - add and return
97 * @i: integer value to add
98 * @v: pointer to type atomic64_t
100 * Atomically adds @i to @v and returns @i + *@v
102 static inline long long atomic64_add_return(long long i, atomic64_t *v)
104 asm volatile(ATOMIC64_ALTERNATIVE(add_return)
112 * Other variants with different arithmetic operators:
114 static inline long long atomic64_sub_return(long long i, atomic64_t *v)
116 asm volatile(ATOMIC64_ALTERNATIVE(sub_return)
123 static inline long long atomic64_inc_return(atomic64_t *v)
126 asm volatile(ATOMIC64_ALTERNATIVE(inc_return)
134 static inline long long atomic64_dec_return(atomic64_t *v)
137 asm volatile(ATOMIC64_ALTERNATIVE(dec_return)
146 * atomic64_add - add integer to atomic64 variable
147 * @i: integer value to add
148 * @v: pointer to type atomic64_t
150 * Atomically adds @i to @v.
152 static inline long long atomic64_add(long long i, atomic64_t *v)
154 asm volatile(ATOMIC64_ALTERNATIVE_(add, add_return)
162 * atomic64_sub - subtract the atomic64 variable
163 * @i: integer value to subtract
164 * @v: pointer to type atomic64_t
166 * Atomically subtracts @i from @v.
168 static inline long long atomic64_sub(long long i, atomic64_t *v)
170 asm volatile(ATOMIC64_ALTERNATIVE_(sub, sub_return)
178 * atomic64_sub_and_test - subtract value from variable and test result
179 * @i: integer value to subtract
180 * @v: pointer to type atomic64_t
182 * Atomically subtracts @i from @v and returns
183 * true if the result is zero, or false for all
186 static inline int atomic64_sub_and_test(long long i, atomic64_t *v)
188 return atomic64_sub_return(i, v) == 0;
192 * atomic64_inc - increment atomic64 variable
193 * @v: pointer to type atomic64_t
195 * Atomically increments @v by 1.
197 static inline void atomic64_inc(atomic64_t *v)
199 asm volatile(ATOMIC64_ALTERNATIVE_(inc, inc_return)
201 : "memory", "eax", "ecx", "edx"
206 * atomic64_dec - decrement atomic64 variable
207 * @ptr: pointer to type atomic64_t
209 * Atomically decrements @ptr by 1.
211 static inline void atomic64_dec(atomic64_t *v)
213 asm volatile(ATOMIC64_ALTERNATIVE_(dec, dec_return)
215 : "memory", "eax", "ecx", "edx"
220 * atomic64_dec_and_test - decrement and test
221 * @v: pointer to type atomic64_t
223 * Atomically decrements @v by 1 and
224 * returns true if the result is 0, or false for all other
227 static inline int atomic64_dec_and_test(atomic64_t *v)
229 return atomic64_dec_return(v) == 0;
233 * atomic64_inc_and_test - increment and test
234 * @v: pointer to type atomic64_t
236 * Atomically increments @v by 1
237 * and returns true if the result is zero, or false for all
240 static inline int atomic64_inc_and_test(atomic64_t *v)
242 return atomic64_inc_return(v) == 0;
246 * atomic64_add_negative - add and test if negative
247 * @i: integer value to add
248 * @v: pointer to type atomic64_t
250 * Atomically adds @i to @v and returns true
251 * if the result is negative, or false when
252 * result is greater than or equal to zero.
254 static inline int atomic64_add_negative(long long i, atomic64_t *v)
256 return atomic64_add_return(i, v) < 0;
260 * atomic64_add_unless - add unless the number is a given value
261 * @v: pointer of type atomic64_t
262 * @a: the amount to add to v...
263 * @u: ...unless v is equal to u.
265 * Atomically adds @a to @v, so long as it was not @u.
266 * Returns non-zero if @v was not @u, and zero otherwise.
268 static inline int atomic64_add_unless(atomic64_t *v, long long a, long long u)
270 unsigned low = (unsigned)u;
271 unsigned high = (unsigned)(u >> 32);
272 asm volatile(ATOMIC64_ALTERNATIVE(add_unless) "\n\t"
273 : "+A" (a), "+c" (v), "+S" (low), "+D" (high)
279 static inline int atomic64_inc_not_zero(atomic64_t *v)
282 asm volatile(ATOMIC64_ALTERNATIVE(inc_not_zero)
285 : "ecx", "edx", "memory"
290 static inline long long atomic64_dec_if_positive(atomic64_t *v)
293 asm volatile(ATOMIC64_ALTERNATIVE(dec_if_positive)
301 #undef ATOMIC64_ALTERNATIVE
302 #undef ATOMIC64_ALTERNATIVE_
304 #endif /* _ASM_X86_ATOMIC64_32_H */