1
2#ifndef _ARCH_MIPS_LOCAL_H
3#define _ARCH_MIPS_LOCAL_H
4
5#include <linux/percpu.h>
6#include <linux/bitops.h>
7#include <linux/atomic.h>
8#include <asm/cmpxchg.h>
9#include <asm/compiler.h>
10#include <asm/war.h>
11
12typedef struct
13{
14 atomic_long_t a;
15} local_t;
16
17#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
18
19#define local_read(l) atomic_long_read(&(l)->a)
20#define local_set(l, i) atomic_long_set(&(l)->a, (i))
21
22#define local_add(i, l) atomic_long_add((i), (&(l)->a))
23#define local_sub(i, l) atomic_long_sub((i), (&(l)->a))
24#define local_inc(l) atomic_long_inc(&(l)->a)
25#define local_dec(l) atomic_long_dec(&(l)->a)
26
27
28
29
30static __inline__ long local_add_return(long i, local_t * l)
31{
32 unsigned long result;
33
34 if (kernel_uses_llsc && IS_ENABLED(CONFIG_WAR_R10000_LLSC)) {
35 unsigned long temp;
36
37 __asm__ __volatile__(
38 " .set push \n"
39 " .set arch=r4000 \n"
40 __SYNC(full, loongson3_war) " \n"
41 "1:" __LL "%1, %2 # local_add_return \n"
42 " addu %0, %1, %3 \n"
43 __SC "%0, %2 \n"
44 " beqzl %0, 1b \n"
45 " addu %0, %1, %3 \n"
46 " .set pop \n"
47 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
48 : "Ir" (i), "m" (l->a.counter)
49 : "memory");
50 } else if (kernel_uses_llsc) {
51 unsigned long temp;
52
53 __asm__ __volatile__(
54 " .set push \n"
55 " .set "MIPS_ISA_ARCH_LEVEL" \n"
56 __SYNC(full, loongson3_war) " \n"
57 "1:" __LL "%1, %2 # local_add_return \n"
58 " addu %0, %1, %3 \n"
59 __SC "%0, %2 \n"
60 " beqz %0, 1b \n"
61 " addu %0, %1, %3 \n"
62 " .set pop \n"
63 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
64 : "Ir" (i), "m" (l->a.counter)
65 : "memory");
66 } else {
67 unsigned long flags;
68
69 local_irq_save(flags);
70 result = l->a.counter;
71 result += i;
72 l->a.counter = result;
73 local_irq_restore(flags);
74 }
75
76 return result;
77}
78
79static __inline__ long local_sub_return(long i, local_t * l)
80{
81 unsigned long result;
82
83 if (kernel_uses_llsc && IS_ENABLED(CONFIG_WAR_R10000_LLSC)) {
84 unsigned long temp;
85
86 __asm__ __volatile__(
87 " .set push \n"
88 " .set arch=r4000 \n"
89 __SYNC(full, loongson3_war) " \n"
90 "1:" __LL "%1, %2 # local_sub_return \n"
91 " subu %0, %1, %3 \n"
92 __SC "%0, %2 \n"
93 " beqzl %0, 1b \n"
94 " subu %0, %1, %3 \n"
95 " .set pop \n"
96 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
97 : "Ir" (i), "m" (l->a.counter)
98 : "memory");
99 } else if (kernel_uses_llsc) {
100 unsigned long temp;
101
102 __asm__ __volatile__(
103 " .set push \n"
104 " .set "MIPS_ISA_ARCH_LEVEL" \n"
105 __SYNC(full, loongson3_war) " \n"
106 "1:" __LL "%1, %2 # local_sub_return \n"
107 " subu %0, %1, %3 \n"
108 __SC "%0, %2 \n"
109 " beqz %0, 1b \n"
110 " subu %0, %1, %3 \n"
111 " .set pop \n"
112 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
113 : "Ir" (i), "m" (l->a.counter)
114 : "memory");
115 } else {
116 unsigned long flags;
117
118 local_irq_save(flags);
119 result = l->a.counter;
120 result -= i;
121 l->a.counter = result;
122 local_irq_restore(flags);
123 }
124
125 return result;
126}
127
128#define local_cmpxchg(l, o, n) \
129 ((long)cmpxchg_local(&((l)->a.counter), (o), (n)))
130#define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n)))
131
132
133
134
135
136
137
138
139
140
141#define local_add_unless(l, a, u) \
142({ \
143 long c, old; \
144 c = local_read(l); \
145 while (c != (u) && (old = local_cmpxchg((l), c, c + (a))) != c) \
146 c = old; \
147 c != (u); \
148})
149#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
150
151#define local_dec_return(l) local_sub_return(1, (l))
152#define local_inc_return(l) local_add_return(1, (l))
153
154
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160
161
162
163#define local_sub_and_test(i, l) (local_sub_return((i), (l)) == 0)
164
165
166
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168
169
170
171
172
173#define local_inc_and_test(l) (local_inc_return(l) == 0)
174
175
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178
179
180
181
182
183#define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
184
185
186
187
188
189
190
191
192
193
194#define local_add_negative(i, l) (local_add_return(i, (l)) < 0)
195
196
197
198
199
200
201#define __local_inc(l) ((l)->a.counter++)
202#define __local_dec(l) ((l)->a.counter++)
203#define __local_add(i, l) ((l)->a.counter+=(i))
204#define __local_sub(i, l) ((l)->a.counter-=(i))
205
206#endif
207