1#ifndef _ALPHA_LOCAL_H 2#define _ALPHA_LOCAL_H 3 4#include <linux/percpu.h> 5#include <linux/atomic.h> 6 7typedef struct 8{ 9 atomic_long_t a; 10} local_t; 11 12#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) } 13#define local_read(l) atomic_long_read(&(l)->a) 14#define local_set(l,i) atomic_long_set(&(l)->a, (i)) 15#define local_inc(l) atomic_long_inc(&(l)->a) 16#define local_dec(l) atomic_long_dec(&(l)->a) 17#define local_add(i,l) atomic_long_add((i),(&(l)->a)) 18#define local_sub(i,l) atomic_long_sub((i),(&(l)->a)) 19 20static __inline__ long local_add_return(long i, local_t * l) 21{ 22 long temp, result; 23 __asm__ __volatile__( 24 "1: ldq_l %0,%1\n" 25 " addq %0,%3,%2\n" 26 " addq %0,%3,%0\n" 27 " stq_c %0,%1\n" 28 " beq %0,2f\n" 29 ".subsection 2\n" 30 "2: br 1b\n" 31 ".previous" 32 :"=&r" (temp), "=m" (l->a.counter), "=&r" (result) 33 :"Ir" (i), "m" (l->a.counter) : "memory"); 34 return result; 35} 36 37static __inline__ long local_sub_return(long i, local_t * l) 38{ 39 long temp, result; 40 __asm__ __volatile__( 41 "1: ldq_l %0,%1\n" 42 " subq %0,%3,%2\n" 43 " subq %0,%3,%0\n" 44 " stq_c %0,%1\n" 45 " beq %0,2f\n" 46 ".subsection 2\n" 47 "2: br 1b\n" 48 ".previous" 49 :"=&r" (temp), "=m" (l->a.counter), "=&r" (result) 50 :"Ir" (i), "m" (l->a.counter) : "memory"); 51 return result; 52} 53 54#define local_cmpxchg(l, o, n) \ 55 (cmpxchg_local(&((l)->a.counter), (o), (n))) 56#define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n))) 57 58/** 59 * local_add_unless - add unless the number is a given value 60 * @l: pointer of type local_t 61 * @a: the amount to add to l... 62 * @u: ...unless l is equal to u. 63 * 64 * Atomically adds @a to @l, so long as it was not @u. 65 * Returns non-zero if @l was not @u, and zero otherwise. 66 */ 67#define local_add_unless(l, a, u) \ 68({ \ 69 long c, old; \ 70 c = local_read(l); \ 71 for (;;) { \ 72 if (unlikely(c == (u))) \ 73 break; \ 74 old = local_cmpxchg((l), c, c + (a)); \ 75 if (likely(old == c)) \ 76 break; \ 77 c = old; \ 78 } \ 79 c != (u); \ 80}) 81#define local_inc_not_zero(l) local_add_unless((l), 1, 0) 82 83#define local_add_negative(a, l) (local_add_return((a), (l)) < 0) 84 85#define local_dec_return(l) local_sub_return(1,(l)) 86 87#define local_inc_return(l) local_add_return(1,(l)) 88 89#define local_sub_and_test(i,l) (local_sub_return((i), (l)) == 0) 90 91#define local_inc_and_test(l) (local_add_return(1, (l)) == 0) 92 93#define local_dec_and_test(l) (local_sub_return(1, (l)) == 0) 94 95/* Verify if faster than atomic ops */ 96#define __local_inc(l) ((l)->a.counter++) 97#define __local_dec(l) ((l)->a.counter++) 98#define __local_add(i,l) ((l)->a.counter+=(i)) 99#define __local_sub(i,l) ((l)->a.counter-=(i)) 100 101#endif /* _ALPHA_LOCAL_H */ 102