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 <linux/compiler.h>
12 #include <asm/synch.h>
13 #include <asm/asm-compat.h>
15 #define ATOMIC_INIT(i) { (i) }
17 #define atomic_read(v) ((v)->counter)
18 #define atomic_set(v,i) (((v)->counter) = (i))
20 static __inline__
void atomic_add(int a
, atomic_t
*v
)
25 "1: lwarx %0,0,%3 # atomic_add\n\
30 : "=&r" (t
), "+m" (v
->counter
)
31 : "r" (a
), "r" (&v
->counter
)
35 static __inline__
int atomic_add_return(int a
, atomic_t
*v
)
41 "1: lwarx %0,0,%2 # atomic_add_return\n\
48 : "r" (a
), "r" (&v
->counter
)
54 #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
56 static __inline__
void atomic_sub(int a
, atomic_t
*v
)
61 "1: lwarx %0,0,%3 # atomic_sub\n\
66 : "=&r" (t
), "+m" (v
->counter
)
67 : "r" (a
), "r" (&v
->counter
)
71 static __inline__
int atomic_sub_return(int a
, atomic_t
*v
)
77 "1: lwarx %0,0,%2 # atomic_sub_return\n\
84 : "r" (a
), "r" (&v
->counter
)
90 static __inline__
void atomic_inc(atomic_t
*v
)
95 "1: lwarx %0,0,%2 # atomic_inc\n\
100 : "=&r" (t
), "+m" (v
->counter
)
105 static __inline__
int atomic_inc_return(atomic_t
*v
)
109 __asm__
__volatile__(
111 "1: lwarx %0,0,%1 # atomic_inc_return\n\
125 * atomic_inc_and_test - increment and test
126 * @v: pointer of type atomic_t
128 * Atomically increments @v by 1
129 * and returns true if the result is zero, or false for all
132 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
134 static __inline__
void atomic_dec(atomic_t
*v
)
138 __asm__
__volatile__(
139 "1: lwarx %0,0,%2 # atomic_dec\n\
144 : "=&r" (t
), "+m" (v
->counter
)
149 static __inline__
int atomic_dec_return(atomic_t
*v
)
153 __asm__
__volatile__(
155 "1: lwarx %0,0,%1 # atomic_dec_return\n\
168 #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
169 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
172 * atomic_add_unless - add unless the number is a given value
173 * @v: pointer of type atomic_t
174 * @a: the amount to add to v...
175 * @u: ...unless v is equal to u.
177 * Atomically adds @a to @v, so long as it was not @u.
178 * Returns non-zero if @v was not @u, and zero otherwise.
180 static __inline__
int atomic_add_unless(atomic_t
*v
, int a
, int u
)
184 __asm__
__volatile__ (
186 "1: lwarx %0,0,%1 # atomic_add_unless\n\
197 : "r" (&v
->counter
), "r" (a
), "r" (u
)
203 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
205 #define atomic_sub_and_test(a, v) (atomic_sub_return((a), (v)) == 0)
206 #define atomic_dec_and_test(v) (atomic_dec_return((v)) == 0)
209 * Atomically test *v and decrement if it is greater than 0.
210 * The function returns the old value of *v minus 1, even if
211 * the atomic variable, v, was not decremented.
213 static __inline__
int atomic_dec_if_positive(atomic_t
*v
)
217 __asm__
__volatile__(
219 "1: lwarx %0,0,%1 # atomic_dec_if_positive\n\
235 #define smp_mb__before_atomic_dec() smp_mb()
236 #define smp_mb__after_atomic_dec() smp_mb()
237 #define smp_mb__before_atomic_inc() smp_mb()
238 #define smp_mb__after_atomic_inc() smp_mb()
242 typedef struct { volatile long counter
; } atomic64_t
;
244 #define ATOMIC64_INIT(i) { (i) }
246 #define atomic64_read(v) ((v)->counter)
247 #define atomic64_set(v,i) (((v)->counter) = (i))
249 static __inline__
void atomic64_add(long a
, atomic64_t
*v
)
253 __asm__
__volatile__(
254 "1: ldarx %0,0,%3 # atomic64_add\n\
258 : "=&r" (t
), "+m" (v
->counter
)
259 : "r" (a
), "r" (&v
->counter
)
263 static __inline__
long atomic64_add_return(long a
, atomic64_t
*v
)
267 __asm__
__volatile__(
269 "1: ldarx %0,0,%2 # atomic64_add_return\n\
275 : "r" (a
), "r" (&v
->counter
)
281 #define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)
283 static __inline__
void atomic64_sub(long a
, atomic64_t
*v
)
287 __asm__
__volatile__(
288 "1: ldarx %0,0,%3 # atomic64_sub\n\
292 : "=&r" (t
), "+m" (v
->counter
)
293 : "r" (a
), "r" (&v
->counter
)
297 static __inline__
long atomic64_sub_return(long a
, atomic64_t
*v
)
301 __asm__
__volatile__(
303 "1: ldarx %0,0,%2 # atomic64_sub_return\n\
309 : "r" (a
), "r" (&v
->counter
)
315 static __inline__
void atomic64_inc(atomic64_t
*v
)
319 __asm__
__volatile__(
320 "1: ldarx %0,0,%2 # atomic64_inc\n\
324 : "=&r" (t
), "+m" (v
->counter
)
329 static __inline__
long atomic64_inc_return(atomic64_t
*v
)
333 __asm__
__volatile__(
335 "1: ldarx %0,0,%1 # atomic64_inc_return\n\
348 * atomic64_inc_and_test - increment and test
349 * @v: pointer of type atomic64_t
351 * Atomically increments @v by 1
352 * and returns true if the result is zero, or false for all
355 #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
357 static __inline__
void atomic64_dec(atomic64_t
*v
)
361 __asm__
__volatile__(
362 "1: ldarx %0,0,%2 # atomic64_dec\n\
366 : "=&r" (t
), "+m" (v
->counter
)
371 static __inline__
long atomic64_dec_return(atomic64_t
*v
)
375 __asm__
__volatile__(
377 "1: ldarx %0,0,%1 # atomic64_dec_return\n\
389 #define atomic64_sub_and_test(a, v) (atomic64_sub_return((a), (v)) == 0)
390 #define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0)
393 * Atomically test *v and decrement if it is greater than 0.
394 * The function returns the old value of *v minus 1.
396 static __inline__
long atomic64_dec_if_positive(atomic64_t
*v
)
400 __asm__
__volatile__(
402 "1: ldarx %0,0,%1 # atomic64_dec_if_positive\n\
416 #endif /* __powerpc64__ */
418 #include <asm-generic/atomic.h>
419 #endif /* __KERNEL__ */
420 #endif /* _ASM_POWERPC_ATOMIC_H_ */
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