1 #ifndef _ASM_POWERPC_ATOMIC_H_
2 #define _ASM_POWERPC_ATOMIC_H_
5 * PowerPC atomic operations
8 #include <linux/types.h>
11 #include <linux/compiler.h>
12 #include <asm/synch.h>
13 #include <asm/asm-compat.h>
14 #include <asm/system.h>
16 #define ATOMIC_INIT(i) { (i) }
18 static __inline__ int atomic_read(const atomic_t *v)
22 __asm__ __volatile__("lwz%U1%X1 %0,%1" : "=r"(t) : "m"(v->counter));
27 static __inline__ void atomic_set(atomic_t *v, int i)
29 __asm__ __volatile__("stw%U0%X0 %1,%0" : "=m"(v->counter) : "r"(i));
32 static __inline__ void atomic_add(int a, atomic_t *v)
37 "1: lwarx %0,0,%3 # atomic_add\n\
42 : "=&r" (t), "+m" (v->counter)
43 : "r" (a), "r" (&v->counter)
47 static __inline__ int atomic_add_return(int a, atomic_t *v)
52 PPC_ATOMIC_ENTRY_BARRIER
53 "1: lwarx %0,0,%2 # atomic_add_return\n\
58 PPC_ATOMIC_EXIT_BARRIER
60 : "r" (a), "r" (&v->counter)
66 #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
68 static __inline__ void atomic_sub(int a, atomic_t *v)
73 "1: lwarx %0,0,%3 # atomic_sub\n\
78 : "=&r" (t), "+m" (v->counter)
79 : "r" (a), "r" (&v->counter)
83 static __inline__ int atomic_sub_return(int a, atomic_t *v)
88 PPC_ATOMIC_ENTRY_BARRIER
89 "1: lwarx %0,0,%2 # atomic_sub_return\n\
94 PPC_ATOMIC_EXIT_BARRIER
96 : "r" (a), "r" (&v->counter)
102 static __inline__ void atomic_inc(atomic_t *v)
106 __asm__ __volatile__(
107 "1: lwarx %0,0,%2 # atomic_inc\n\
112 : "=&r" (t), "+m" (v->counter)
117 static __inline__ int atomic_inc_return(atomic_t *v)
121 __asm__ __volatile__(
122 PPC_ATOMIC_ENTRY_BARRIER
123 "1: lwarx %0,0,%1 # atomic_inc_return\n\
128 PPC_ATOMIC_EXIT_BARRIER
131 : "cc", "xer", "memory");
137 * atomic_inc_and_test - increment and test
138 * @v: pointer of type atomic_t
140 * Atomically increments @v by 1
141 * and returns true if the result is zero, or false for all
144 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
146 static __inline__ void atomic_dec(atomic_t *v)
150 __asm__ __volatile__(
151 "1: lwarx %0,0,%2 # atomic_dec\n\
156 : "=&r" (t), "+m" (v->counter)
161 static __inline__ int atomic_dec_return(atomic_t *v)
165 __asm__ __volatile__(
166 PPC_ATOMIC_ENTRY_BARRIER
167 "1: lwarx %0,0,%1 # atomic_dec_return\n\
172 PPC_ATOMIC_EXIT_BARRIER
175 : "cc", "xer", "memory");
180 #define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
181 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
184 * __atomic_add_unless - add unless the number is a given value
185 * @v: pointer of type atomic_t
186 * @a: the amount to add to v...
187 * @u: ...unless v is equal to u.
189 * Atomically adds @a to @v, so long as it was not @u.
190 * Returns the old value of @v.
192 static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
196 __asm__ __volatile__ (
197 PPC_ATOMIC_ENTRY_BARRIER
198 "1: lwarx %0,0,%1 # __atomic_add_unless\n\
205 PPC_ATOMIC_EXIT_BARRIER
209 : "r" (&v->counter), "r" (a), "r" (u)
216 #define atomic_sub_and_test(a, v) (atomic_sub_return((a), (v)) == 0)
217 #define atomic_dec_and_test(v) (atomic_dec_return((v)) == 0)
220 * Atomically test *v and decrement if it is greater than 0.
221 * The function returns the old value of *v minus 1, even if
222 * the atomic variable, v, was not decremented.
224 static __inline__ int atomic_dec_if_positive(atomic_t *v)
228 __asm__ __volatile__(
229 PPC_ATOMIC_ENTRY_BARRIER
230 "1: lwarx %0,0,%1 # atomic_dec_if_positive\n\
237 PPC_ATOMIC_EXIT_BARRIER
246 #define smp_mb__before_atomic_dec() smp_mb()
247 #define smp_mb__after_atomic_dec() smp_mb()
248 #define smp_mb__before_atomic_inc() smp_mb()
249 #define smp_mb__after_atomic_inc() smp_mb()
253 #define ATOMIC64_INIT(i) { (i) }
255 static __inline__ long atomic64_read(const atomic64_t *v)
259 __asm__ __volatile__("ld%U1%X1 %0,%1" : "=r"(t) : "m"(v->counter));
264 static __inline__ void atomic64_set(atomic64_t *v, long i)
266 __asm__ __volatile__("std%U0%X0 %1,%0" : "=m"(v->counter) : "r"(i));
269 static __inline__ void atomic64_add(long a, atomic64_t *v)
273 __asm__ __volatile__(
274 "1: ldarx %0,0,%3 # atomic64_add\n\
278 : "=&r" (t), "+m" (v->counter)
279 : "r" (a), "r" (&v->counter)
283 static __inline__ long atomic64_add_return(long a, atomic64_t *v)
287 __asm__ __volatile__(
288 PPC_ATOMIC_ENTRY_BARRIER
289 "1: ldarx %0,0,%2 # atomic64_add_return\n\
293 PPC_ATOMIC_EXIT_BARRIER
295 : "r" (a), "r" (&v->counter)
301 #define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)
303 static __inline__ void atomic64_sub(long a, atomic64_t *v)
307 __asm__ __volatile__(
308 "1: ldarx %0,0,%3 # atomic64_sub\n\
312 : "=&r" (t), "+m" (v->counter)
313 : "r" (a), "r" (&v->counter)
317 static __inline__ long atomic64_sub_return(long a, atomic64_t *v)
321 __asm__ __volatile__(
322 PPC_ATOMIC_ENTRY_BARRIER
323 "1: ldarx %0,0,%2 # atomic64_sub_return\n\
327 PPC_ATOMIC_EXIT_BARRIER
329 : "r" (a), "r" (&v->counter)
335 static __inline__ void atomic64_inc(atomic64_t *v)
339 __asm__ __volatile__(
340 "1: ldarx %0,0,%2 # atomic64_inc\n\
344 : "=&r" (t), "+m" (v->counter)
349 static __inline__ long atomic64_inc_return(atomic64_t *v)
353 __asm__ __volatile__(
354 PPC_ATOMIC_ENTRY_BARRIER
355 "1: ldarx %0,0,%1 # atomic64_inc_return\n\
359 PPC_ATOMIC_EXIT_BARRIER
362 : "cc", "xer", "memory");
368 * atomic64_inc_and_test - increment and test
369 * @v: pointer of type atomic64_t
371 * Atomically increments @v by 1
372 * and returns true if the result is zero, or false for all
375 #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
377 static __inline__ void atomic64_dec(atomic64_t *v)
381 __asm__ __volatile__(
382 "1: ldarx %0,0,%2 # atomic64_dec\n\
386 : "=&r" (t), "+m" (v->counter)
391 static __inline__ long atomic64_dec_return(atomic64_t *v)
395 __asm__ __volatile__(
396 PPC_ATOMIC_ENTRY_BARRIER
397 "1: ldarx %0,0,%1 # atomic64_dec_return\n\
401 PPC_ATOMIC_EXIT_BARRIER
404 : "cc", "xer", "memory");
409 #define atomic64_sub_and_test(a, v) (atomic64_sub_return((a), (v)) == 0)
410 #define atomic64_dec_and_test(v) (atomic64_dec_return((v)) == 0)
413 * Atomically test *v and decrement if it is greater than 0.
414 * The function returns the old value of *v minus 1.
416 static __inline__ long atomic64_dec_if_positive(atomic64_t *v)
420 __asm__ __volatile__(
421 PPC_ATOMIC_ENTRY_BARRIER
422 "1: ldarx %0,0,%1 # atomic64_dec_if_positive\n\
427 PPC_ATOMIC_EXIT_BARRIER
431 : "cc", "xer", "memory");
436 #define atomic64_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
437 #define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
440 * atomic64_add_unless - add unless the number is a given value
441 * @v: pointer of type atomic64_t
442 * @a: the amount to add to v...
443 * @u: ...unless v is equal to u.
445 * Atomically adds @a to @v, so long as it was not @u.
446 * Returns the old value of @v.
448 static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
452 __asm__ __volatile__ (
453 PPC_ATOMIC_ENTRY_BARRIER
454 "1: ldarx %0,0,%1 # __atomic_add_unless\n\
460 PPC_ATOMIC_EXIT_BARRIER
464 : "r" (&v->counter), "r" (a), "r" (u)
470 #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
472 #endif /* __powerpc64__ */
474 #endif /* __KERNEL__ */
475 #endif /* _ASM_POWERPC_ATOMIC_H_ */