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- #ifndef _ALPHA_LOCAL_H
- #define _ALPHA_LOCAL_H
- #include <linux/percpu.h>
- #include <linux/atomic.h>
- typedef struct
- {
- atomic_long_t a;
- } local_t;
- #define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
- #define local_read(l) atomic_long_read(&(l)->a)
- #define local_set(l,i) atomic_long_set(&(l)->a, (i))
- #define local_inc(l) atomic_long_inc(&(l)->a)
- #define local_dec(l) atomic_long_dec(&(l)->a)
- #define local_add(i,l) atomic_long_add((i),(&(l)->a))
- #define local_sub(i,l) atomic_long_sub((i),(&(l)->a))
- static __inline__ long local_add_return(long i, local_t * l)
- {
- long temp, result;
- __asm__ __volatile__(
- "1: ldq_l %0,%1\n"
- " addq %0,%3,%2\n"
- " addq %0,%3,%0\n"
- " stq_c %0,%1\n"
- " beq %0,2f\n"
- ".subsection 2\n"
- "2: br 1b\n"
- ".previous"
- :"=&r" (temp), "=m" (l->a.counter), "=&r" (result)
- :"Ir" (i), "m" (l->a.counter) : "memory");
- return result;
- }
- static __inline__ long local_sub_return(long i, local_t * l)
- {
- long temp, result;
- __asm__ __volatile__(
- "1: ldq_l %0,%1\n"
- " subq %0,%3,%2\n"
- " subq %0,%3,%0\n"
- " stq_c %0,%1\n"
- " beq %0,2f\n"
- ".subsection 2\n"
- "2: br 1b\n"
- ".previous"
- :"=&r" (temp), "=m" (l->a.counter), "=&r" (result)
- :"Ir" (i), "m" (l->a.counter) : "memory");
- return result;
- }
- #define local_cmpxchg(l, o, n) \
- (cmpxchg_local(&((l)->a.counter), (o), (n)))
- #define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n)))
- /**
- * local_add_unless - add unless the number is a given value
- * @l: pointer of type local_t
- * @a: the amount to add to l...
- * @u: ...unless l is equal to u.
- *
- * Atomically adds @a to @l, so long as it was not @u.
- * Returns non-zero if @l was not @u, and zero otherwise.
- */
- #define local_add_unless(l, a, u) \
- ({ \
- long c, old; \
- c = local_read(l); \
- for (;;) { \
- if (unlikely(c == (u))) \
- break; \
- old = local_cmpxchg((l), c, c + (a)); \
- if (likely(old == c)) \
- break; \
- c = old; \
- } \
- c != (u); \
- })
- #define local_inc_not_zero(l) local_add_unless((l), 1, 0)
- #define local_add_negative(a, l) (local_add_return((a), (l)) < 0)
- #define local_dec_return(l) local_sub_return(1,(l))
- #define local_inc_return(l) local_add_return(1,(l))
- #define local_sub_and_test(i,l) (local_sub_return((i), (l)) == 0)
- #define local_inc_and_test(l) (local_add_return(1, (l)) == 0)
- #define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
- /* Verify if faster than atomic ops */
- #define __local_inc(l) ((l)->a.counter++)
- #define __local_dec(l) ((l)->a.counter++)
- #define __local_add(i,l) ((l)->a.counter+=(i))
- #define __local_sub(i,l) ((l)->a.counter-=(i))
- #endif /* _ALPHA_LOCAL_H */
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