1 #ifndef _ALPHA_LOCAL_H
2 #define _ALPHA_LOCAL_H
3
4 #include <linux/percpu.h>
5 #include <linux/atomic.h>
6
7 typedef 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
local_add_return(long i,local_t * l)20 static __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
local_sub_return(long i,local_t * l)37 static __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