1 #ifndef _ASM_POWERPC_ATOMIC_H_
2 #define _ASM_POWERPC_ATOMIC_H_
5 * PowerPC atomic operations
8 typedef struct { volatile int counter; } atomic_t;
11 #include <asm/synch.h>
12 #include <asm/asm-compat.h>
14 #define ATOMIC_INIT(i) { (i) }
16 #define atomic_read(v) ((v)->counter)
17 #define atomic_set(v,i) (((v)->counter) = (i))
19 static __inline__ void atomic_add(int a, atomic_t *v)
24 "1: lwarx %0,0,%3 # atomic_add\n\
29 : "=&r" (t), "=m" (v->counter)
30 : "r" (a), "r" (&v->counter), "m" (v->counter)
34 static __inline__ int atomic_add_return(int a, atomic_t *v)
40 "1: lwarx %0,0,%2 # atomic_add_return\n\
47 : "r" (a), "r" (&v->counter)
53 #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
55 static __inline__ void atomic_sub(int a, atomic_t *v)
60 "1: lwarx %0,0,%3 # atomic_sub\n\
65 : "=&r" (t), "=m" (v->counter)
66 : "r" (a), "r" (&v->counter), "m" (v->counter)
70 static __inline__ int atomic_sub_return(int a, atomic_t *v)
76 "1: lwarx %0,0,%2 # atomic_sub_return\n\
83 : "r" (a), "r" (&v->counter)
89 static __inline__ void atomic_inc(atomic_t *v)
94 "1: lwarx %0,0,%2 # atomic_inc\n\
99 : "=&r" (t), "=m" (v->counter)
100 : "r" (&v->counter), "m" (v->counter)
104 static __inline__ int atomic_inc_return(atomic_t *v)
108 __asm__ __volatile__(
110 "1: lwarx %0,0,%1 # atomic_inc_return\n\
124 * atomic_inc_and_test - increment and test
125 * @v: pointer of type atomic_t
127 * Atomically increments @v by 1
128 * and returns true if the result is zero, or false for all
131 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
133 static __inline__ void atomic_dec(atomic_t *v)
137 __asm__ __volatile__(
138 "1: lwarx %0,0,%2 # atomic_dec\n\
143 : "=&r" (t), "=m" (v->counter)
144 : "r" (&v->counter), "m" (v->counter)
148 static __inline__ int atomic_dec_return(atomic_t *v)
152 __asm__ __volatile__(
154 "1: lwarx %0,0,%1 # atomic_dec_return\n\
167 #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
170 * atomic_add_unless - add unless the number is a given value
171 * @v: pointer of type atomic_t
172 * @a: the amount to add to v...
173 * @u: ...unless v is equal to u.
175 * Atomically adds @a to @v, so long as it was not @u.
176 * Returns non-zero if @v was not @u, and zero otherwise.
178 #define atomic_add_unless(v, a, u) \
181 c = atomic_read(v); \
183 if (unlikely(c == (u))) \
185 old = atomic_cmpxchg((v), c, c + (a)); \
186 if (likely(old == c)) \
192 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
194 #define atomic_sub_and_test(a, v) (atomic_sub_return((a), (v)) == 0)
195 #define atomic_dec_and_test(v) (atomic_dec_return((v)) == 0)
198 * Atomically test *v and decrement if it is greater than 0.
199 * The function returns the old value of *v minus 1.
201 static __inline__ int atomic_dec_if_positive(atomic_t *v)
205 __asm__ __volatile__(
207 "1: lwarx %0,0,%1 # atomic_dec_if_positive\n\
222 #define smp_mb__before_atomic_dec() smp_mb()
223 #define smp_mb__after_atomic_dec() smp_mb()
224 #define smp_mb__before_atomic_inc() smp_mb()
225 #define smp_mb__after_atomic_inc() smp_mb()
229 typedef struct { volatile long counter; } atomic64_t;
231 #define ATOMIC64_INIT(i) { (i) }
233 #define atomic64_read(v) ((v)->counter)
234 #define atomic64_set(v,i) (((v)->counter) = (i))
236 static __inline__ void atomic64_add(long a, atomic64_t *v)
240 __asm__ __volatile__(
241 "1: ldarx %0,0,%3 # atomic64_add\n\
245 : "=&r" (t), "=m" (v->counter)
246 : "r" (a), "r" (&v->counter), "m" (v->counter)
250 static __inline__ long atomic64_add_return(long a, atomic64_t *v)
254 __asm__ __volatile__(
256 "1: ldarx %0,0,%2 # atomic64_add_return\n\
262 : "r" (a), "r" (&v->counter)
268 #define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)
270 static __inline__ void atomic64_sub(long a, atomic64_t *v)
274 __asm__ __volatile__(
275 "1: ldarx %0,0,%3 # atomic64_sub\n\
279 : "=&r" (t), "=m" (v->counter)
280 : "r" (a), "r" (&v->counter), "m" (v->counter)
284 static __inline__ long atomic64_sub_return(long a, atomic64_t *v)
288 __asm__ __volatile__(
290 "1: ldarx %0,0,%2 # atomic64_sub_return\n\
296 : "r" (a), "r" (&v->counter)
302 static __inline__ void atomic64_inc(atomic64_t *v)
306 __asm__ __volatile__(
307 "1: ldarx %0,0,%2 # atomic64_inc\n\
311 : "=&r" (t), "=m" (v->counter)
312 : "r" (&v->counter), "m" (v->counter)
316 static __inline__ long atomic64_inc_return(atomic64_t *v)
320 __asm__ __volatile__(
322 "1: ldarx %0,0,%1 # atomic64_inc_return\n\
335 * atomic64_inc_and_test - increment and test
336 * @v: pointer of type atomic64_t
338 * Atomically increments @v by 1
339 * and returns true if the result is zero, or false for all
342 #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
344 static __inline__ void atomic64_dec(atomic64_t *v)
348 __asm__ __volatile__(
349 "1: ldarx %0,0,%2 # atomic64_dec\n\
353 : "=&r" (t), "=m" (v->counter)
354 : "r" (&v->counter), "m" (v->counter)
358 static __inline__ long atomic64_dec_return(atomic64_t *v)
362 __asm__ __volatile__(
364 "1: ldarx %0,0,%1 # atomic64_dec_return\n\
376 #define atomic64_sub_and_test(a, v) (atomic64_sub_return((a), (v)) == 0)
377 #define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0)
380 * Atomically test *v and decrement if it is greater than 0.
381 * The function returns the old value of *v minus 1.
383 static __inline__ long atomic64_dec_if_positive(atomic64_t *v)
387 __asm__ __volatile__(
389 "1: ldarx %0,0,%1 # atomic64_dec_if_positive\n\
403 #endif /* __powerpc64__ */
405 #include <asm-generic/atomic.h>
406 #endif /* __KERNEL__ */
407 #endif /* _ASM_POWERPC_ATOMIC_H_ */