1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ALPHA_LOCAL_H
3#define _ALPHA_LOCAL_H
4
5#include <linux/percpu.h>
6#include <linux/atomic.h>
7
8typedef struct
9{
10	atomic_long_t a;
11} local_t;
12
13#define LOCAL_INIT(i)	{ ATOMIC_LONG_INIT(i) }
14#define local_read(l)	atomic_long_read(&(l)->a)
15#define local_set(l,i)	atomic_long_set(&(l)->a, (i))
16#define local_inc(l)	atomic_long_inc(&(l)->a)
17#define local_dec(l)	atomic_long_dec(&(l)->a)
18#define local_add(i,l)	atomic_long_add((i),(&(l)->a))
19#define local_sub(i,l)	atomic_long_sub((i),(&(l)->a))
20
21static __inline__ long local_add_return(long i, local_t * l)
22{
23	long temp, result;
24	__asm__ __volatile__(
25	"1:	ldq_l %0,%1\n"
26	"	addq %0,%3,%2\n"
27	"	addq %0,%3,%0\n"
28	"	stq_c %0,%1\n"
29	"	beq %0,2f\n"
30	".subsection 2\n"
31	"2:	br 1b\n"
32	".previous"
33	:"=&r" (temp), "=m" (l->a.counter), "=&r" (result)
34	:"Ir" (i), "m" (l->a.counter) : "memory");
35	return result;
36}
37
38static __inline__ long local_sub_return(long i, local_t * l)
39{
40	long temp, result;
41	__asm__ __volatile__(
42	"1:	ldq_l %0,%1\n"
43	"	subq %0,%3,%2\n"
44	"	subq %0,%3,%0\n"
45	"	stq_c %0,%1\n"
46	"	beq %0,2f\n"
47	".subsection 2\n"
48	"2:	br 1b\n"
49	".previous"
50	:"=&r" (temp), "=m" (l->a.counter), "=&r" (result)
51	:"Ir" (i), "m" (l->a.counter) : "memory");
52	return result;
53}
54
55static __inline__ long local_cmpxchg(local_t *l, long old, long new)
56{
57	return cmpxchg_local(&l->a.counter, old, new);
58}
59
60static __inline__ bool local_try_cmpxchg(local_t *l, long *old, long new)
61{
62	return try_cmpxchg_local(&l->a.counter, (s64 *)old, new);
63}
64
65#define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n)))
66
67/**
68 * local_add_unless - add unless the number is a given value
69 * @l: pointer of type local_t
70 * @a: the amount to add to l...
71 * @u: ...unless l is equal to u.
72 *
73 * Atomically adds @a to @l, so long as it was not @u.
74 * Returns non-zero if @l was not @u, and zero otherwise.
75 */
76#define local_add_unless(l, a, u)				\
77({								\
78	long c, old;						\
79	c = local_read(l);					\
80	for (;;) {						\
81		if (unlikely(c == (u)))				\
82			break;					\
83		old = local_cmpxchg((l), c, c + (a));	\
84		if (likely(old == c))				\
85			break;					\
86		c = old;					\
87	}							\
88	c != (u);						\
89})
90#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
91
92#define local_add_negative(a, l) (local_add_return((a), (l)) < 0)
93
94#define local_dec_return(l) local_sub_return(1,(l))
95
96#define local_inc_return(l) local_add_return(1,(l))
97
98#define local_sub_and_test(i,l) (local_sub_return((i), (l)) == 0)
99
100#define local_inc_and_test(l) (local_add_return(1, (l)) == 0)
101
102#define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
103
104/* Verify if faster than atomic ops */
105#define __local_inc(l)		((l)->a.counter++)
106#define __local_dec(l)		((l)->a.counter++)
107#define __local_add(i,l)	((l)->a.counter+=(i))
108#define __local_sub(i,l)	((l)->a.counter-=(i))
109
110#endif /* _ALPHA_LOCAL_H */
111