1#ifndef _ARCH_MIPS_LOCAL_H
2#define _ARCH_MIPS_LOCAL_H
3
4#include <linux/percpu.h>
5#include <linux/bitops.h>
6#include <linux/atomic.h>
7#include <asm/cmpxchg.h>
8#include <asm/war.h>
9
10typedef struct
11{
12 atomic_long_t a;
13} local_t;
14
15#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
16
17#define local_read(l) atomic_long_read(&(l)->a)
18#define local_set(l, i) atomic_long_set(&(l)->a, (i))
19
20#define local_add(i, l) atomic_long_add((i), (&(l)->a))
21#define local_sub(i, l) atomic_long_sub((i), (&(l)->a))
22#define local_inc(l) atomic_long_inc(&(l)->a)
23#define local_dec(l) atomic_long_dec(&(l)->a)
24
25
26
27
28static __inline__ long local_add_return(long i, local_t * l)
29{
30 unsigned long result;
31
32 if (kernel_uses_llsc && R10000_LLSC_WAR) {
33 unsigned long temp;
34
35 __asm__ __volatile__(
36 " .set mips3 \n"
37 "1:" __LL "%1, %2 # local_add_return \n"
38 " addu %0, %1, %3 \n"
39 __SC "%0, %2 \n"
40 " beqzl %0, 1b \n"
41 " addu %0, %1, %3 \n"
42 " .set mips0 \n"
43 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
44 : "Ir" (i), "m" (l->a.counter)
45 : "memory");
46 } else if (kernel_uses_llsc) {
47 unsigned long temp;
48
49 __asm__ __volatile__(
50 " .set mips3 \n"
51 "1:" __LL "%1, %2 # local_add_return \n"
52 " addu %0, %1, %3 \n"
53 __SC "%0, %2 \n"
54 " beqz %0, 1b \n"
55 " addu %0, %1, %3 \n"
56 " .set mips0 \n"
57 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
58 : "Ir" (i), "m" (l->a.counter)
59 : "memory");
60 } else {
61 unsigned long flags;
62
63 local_irq_save(flags);
64 result = l->a.counter;
65 result += i;
66 l->a.counter = result;
67 local_irq_restore(flags);
68 }
69
70 return result;
71}
72
73static __inline__ long local_sub_return(long i, local_t * l)
74{
75 unsigned long result;
76
77 if (kernel_uses_llsc && R10000_LLSC_WAR) {
78 unsigned long temp;
79
80 __asm__ __volatile__(
81 " .set mips3 \n"
82 "1:" __LL "%1, %2 # local_sub_return \n"
83 " subu %0, %1, %3 \n"
84 __SC "%0, %2 \n"
85 " beqzl %0, 1b \n"
86 " subu %0, %1, %3 \n"
87 " .set mips0 \n"
88 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
89 : "Ir" (i), "m" (l->a.counter)
90 : "memory");
91 } else if (kernel_uses_llsc) {
92 unsigned long temp;
93
94 __asm__ __volatile__(
95 " .set mips3 \n"
96 "1:" __LL "%1, %2 # local_sub_return \n"
97 " subu %0, %1, %3 \n"
98 __SC "%0, %2 \n"
99 " beqz %0, 1b \n"
100 " subu %0, %1, %3 \n"
101 " .set mips0 \n"
102 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
103 : "Ir" (i), "m" (l->a.counter)
104 : "memory");
105 } else {
106 unsigned long flags;
107
108 local_irq_save(flags);
109 result = l->a.counter;
110 result -= i;
111 l->a.counter = result;
112 local_irq_restore(flags);
113 }
114
115 return result;
116}
117
118#define local_cmpxchg(l, o, n) \
119 ((long)cmpxchg_local(&((l)->a.counter), (o), (n)))
120#define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n)))
121
122
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127
128
129
130
131#define local_add_unless(l, a, u) \
132({ \
133 long c, old; \
134 c = local_read(l); \
135 while (c != (u) && (old = local_cmpxchg((l), c, c + (a))) != c) \
136 c = old; \
137 c != (u); \
138})
139#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
140
141#define local_dec_return(l) local_sub_return(1, (l))
142#define local_inc_return(l) local_add_return(1, (l))
143
144
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151
152
153#define local_sub_and_test(i, l) (local_sub_return((i), (l)) == 0)
154
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161
162
163#define local_inc_and_test(l) (local_inc_return(l) == 0)
164
165
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171
172
173#define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
174
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182
183
184#define local_add_negative(i, l) (local_add_return(i, (l)) < 0)
185
186
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188
189
190
191#define __local_inc(l) ((l)->a.counter++)
192#define __local_dec(l) ((l)->a.counter++)
193#define __local_add(i, l) ((l)->a.counter+=(i))
194#define __local_sub(i, l) ((l)->a.counter-=(i))
195
196#endif
197