1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef _ALPHA_LOCAL_H
3*4882a593Smuzhiyun #define _ALPHA_LOCAL_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <linux/percpu.h>
6*4882a593Smuzhiyun #include <linux/atomic.h>
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun typedef struct
9*4882a593Smuzhiyun {
10*4882a593Smuzhiyun atomic_long_t a;
11*4882a593Smuzhiyun } local_t;
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
14*4882a593Smuzhiyun #define local_read(l) atomic_long_read(&(l)->a)
15*4882a593Smuzhiyun #define local_set(l,i) atomic_long_set(&(l)->a, (i))
16*4882a593Smuzhiyun #define local_inc(l) atomic_long_inc(&(l)->a)
17*4882a593Smuzhiyun #define local_dec(l) atomic_long_dec(&(l)->a)
18*4882a593Smuzhiyun #define local_add(i,l) atomic_long_add((i),(&(l)->a))
19*4882a593Smuzhiyun #define local_sub(i,l) atomic_long_sub((i),(&(l)->a))
20*4882a593Smuzhiyun
local_add_return(long i,local_t * l)21*4882a593Smuzhiyun static __inline__ long local_add_return(long i, local_t * l)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun long temp, result;
24*4882a593Smuzhiyun __asm__ __volatile__(
25*4882a593Smuzhiyun "1: ldq_l %0,%1\n"
26*4882a593Smuzhiyun " addq %0,%3,%2\n"
27*4882a593Smuzhiyun " addq %0,%3,%0\n"
28*4882a593Smuzhiyun " stq_c %0,%1\n"
29*4882a593Smuzhiyun " beq %0,2f\n"
30*4882a593Smuzhiyun ".subsection 2\n"
31*4882a593Smuzhiyun "2: br 1b\n"
32*4882a593Smuzhiyun ".previous"
33*4882a593Smuzhiyun :"=&r" (temp), "=m" (l->a.counter), "=&r" (result)
34*4882a593Smuzhiyun :"Ir" (i), "m" (l->a.counter) : "memory");
35*4882a593Smuzhiyun return result;
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
local_sub_return(long i,local_t * l)38*4882a593Smuzhiyun static __inline__ long local_sub_return(long i, local_t * l)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun long temp, result;
41*4882a593Smuzhiyun __asm__ __volatile__(
42*4882a593Smuzhiyun "1: ldq_l %0,%1\n"
43*4882a593Smuzhiyun " subq %0,%3,%2\n"
44*4882a593Smuzhiyun " subq %0,%3,%0\n"
45*4882a593Smuzhiyun " stq_c %0,%1\n"
46*4882a593Smuzhiyun " beq %0,2f\n"
47*4882a593Smuzhiyun ".subsection 2\n"
48*4882a593Smuzhiyun "2: br 1b\n"
49*4882a593Smuzhiyun ".previous"
50*4882a593Smuzhiyun :"=&r" (temp), "=m" (l->a.counter), "=&r" (result)
51*4882a593Smuzhiyun :"Ir" (i), "m" (l->a.counter) : "memory");
52*4882a593Smuzhiyun return result;
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun #define local_cmpxchg(l, o, n) \
56*4882a593Smuzhiyun (cmpxchg_local(&((l)->a.counter), (o), (n)))
57*4882a593Smuzhiyun #define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n)))
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun /**
60*4882a593Smuzhiyun * local_add_unless - add unless the number is a given value
61*4882a593Smuzhiyun * @l: pointer of type local_t
62*4882a593Smuzhiyun * @a: the amount to add to l...
63*4882a593Smuzhiyun * @u: ...unless l is equal to u.
64*4882a593Smuzhiyun *
65*4882a593Smuzhiyun * Atomically adds @a to @l, so long as it was not @u.
66*4882a593Smuzhiyun * Returns non-zero if @l was not @u, and zero otherwise.
67*4882a593Smuzhiyun */
68*4882a593Smuzhiyun #define local_add_unless(l, a, u) \
69*4882a593Smuzhiyun ({ \
70*4882a593Smuzhiyun long c, old; \
71*4882a593Smuzhiyun c = local_read(l); \
72*4882a593Smuzhiyun for (;;) { \
73*4882a593Smuzhiyun if (unlikely(c == (u))) \
74*4882a593Smuzhiyun break; \
75*4882a593Smuzhiyun old = local_cmpxchg((l), c, c + (a)); \
76*4882a593Smuzhiyun if (likely(old == c)) \
77*4882a593Smuzhiyun break; \
78*4882a593Smuzhiyun c = old; \
79*4882a593Smuzhiyun } \
80*4882a593Smuzhiyun c != (u); \
81*4882a593Smuzhiyun })
82*4882a593Smuzhiyun #define local_inc_not_zero(l) local_add_unless((l), 1, 0)
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun #define local_add_negative(a, l) (local_add_return((a), (l)) < 0)
85*4882a593Smuzhiyun
86*4882a593Smuzhiyun #define local_dec_return(l) local_sub_return(1,(l))
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun #define local_inc_return(l) local_add_return(1,(l))
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun #define local_sub_and_test(i,l) (local_sub_return((i), (l)) == 0)
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun #define local_inc_and_test(l) (local_add_return(1, (l)) == 0)
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun #define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun /* Verify if faster than atomic ops */
97*4882a593Smuzhiyun #define __local_inc(l) ((l)->a.counter++)
98*4882a593Smuzhiyun #define __local_dec(l) ((l)->a.counter++)
99*4882a593Smuzhiyun #define __local_add(i,l) ((l)->a.counter+=(i))
100*4882a593Smuzhiyun #define __local_sub(i,l) ((l)->a.counter-=(i))
101*4882a593Smuzhiyun
102*4882a593Smuzhiyun #endif /* _ALPHA_LOCAL_H */
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