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7232311e MD |
1 | #ifndef _ARCH_MIPS_LOCAL_H |
2 | #define _ARCH_MIPS_LOCAL_H | |
1da177e4 | 3 | |
1da177e4 | 4 | #include <linux/percpu.h> |
7232311e | 5 | #include <linux/bitops.h> |
1da177e4 | 6 | #include <asm/atomic.h> |
fef74705 | 7 | #include <asm/cmpxchg.h> |
7232311e | 8 | #include <asm/war.h> |
1da177e4 | 9 | |
7232311e MD |
10 | typedef struct |
11 | { | |
12 | atomic_long_t a; | |
13 | } local_t; | |
1da177e4 | 14 | |
7232311e | 15 | #define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) } |
1da177e4 | 16 | |
7232311e MD |
17 | #define local_read(l) atomic_long_read(&(l)->a) |
18 | #define local_set(l,i) atomic_long_set(&(l)->a, (i)) | |
1da177e4 | 19 | |
7232311e MD |
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) | |
1da177e4 | 24 | |
7232311e MD |
25 | /* |
26 | * Same as above, but return the result value | |
27 | */ | |
28 | static __inline__ long local_add_return(long i, local_t * l) | |
29 | { | |
30 | unsigned long result; | |
31 | ||
32 | if (cpu_has_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 (cpu_has_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; | |
1da177e4 | 62 | |
7232311e MD |
63 | local_irq_save(flags); |
64 | result = l->a.counter; | |
65 | result += i; | |
66 | l->a.counter = result; | |
67 | local_irq_restore(flags); | |
68 | } | |
1da177e4 | 69 | |
7232311e MD |
70 | return result; |
71 | } | |
1da177e4 | 72 | |
7232311e MD |
73 | static __inline__ long local_sub_return(long i, local_t * l) |
74 | { | |
75 | unsigned long result; | |
1da177e4 | 76 | |
7232311e MD |
77 | if (cpu_has_llsc && R10000_LLSC_WAR) { |
78 | unsigned long temp; | |
1da177e4 | 79 | |
7232311e MD |
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 (cpu_has_llsc) { | |
92 | unsigned long temp; | |
1da177e4 | 93 | |
7232311e MD |
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 | } | |
1da177e4 | 117 | |
7232311e MD |
118 | #define local_cmpxchg(l, o, n) \ |
119 | ((long)cmpxchg_local(&((l)->a.counter), (o), (n))) | |
120 | #define local_xchg(l, n) (xchg_local(&((l)->a.counter),(n))) | |
121 | ||
122 | /** | |
123 | * local_add_unless - add unless the number is a given value | |
124 | * @l: pointer of type local_t | |
125 | * @a: the amount to add to l... | |
126 | * @u: ...unless l is equal to u. | |
127 | * | |
128 | * Atomically adds @a to @l, so long as it was not @u. | |
129 | * Returns non-zero if @l was not @u, and zero otherwise. | |
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 | /* | |
145 | * local_sub_and_test - subtract value from variable and test result | |
146 | * @i: integer value to subtract | |
147 | * @l: pointer of type local_t | |
148 | * | |
149 | * Atomically subtracts @i from @l and returns | |
150 | * true if the result is zero, or false for all | |
151 | * other cases. | |
152 | */ | |
153 | #define local_sub_and_test(i,l) (local_sub_return((i), (l)) == 0) | |
154 | ||
155 | /* | |
156 | * local_inc_and_test - increment and test | |
157 | * @l: pointer of type local_t | |
158 | * | |
159 | * Atomically increments @l by 1 | |
160 | * and returns true if the result is zero, or false for all | |
161 | * other cases. | |
162 | */ | |
163 | #define local_inc_and_test(l) (local_inc_return(l) == 0) | |
164 | ||
165 | /* | |
166 | * local_dec_and_test - decrement by 1 and test | |
167 | * @l: pointer of type local_t | |
168 | * | |
169 | * Atomically decrements @l by 1 and | |
170 | * returns true if the result is 0, or false for all other | |
171 | * cases. | |
172 | */ | |
173 | #define local_dec_and_test(l) (local_sub_return(1, (l)) == 0) | |
174 | ||
7232311e MD |
175 | /* |
176 | * local_add_negative - add and test if negative | |
177 | * @l: pointer of type local_t | |
178 | * @i: integer value to add | |
179 | * | |
180 | * Atomically adds @i to @l and returns true | |
181 | * if the result is negative, or false when | |
182 | * result is greater than or equal to zero. | |
183 | */ | |
184 | #define local_add_negative(i,l) (local_add_return(i, (l)) < 0) | |
185 | ||
186 | /* Use these for per-cpu local_t variables: on some archs they are | |
1da177e4 LT |
187 | * much more efficient than these naive implementations. Note they take |
188 | * a variable, not an address. | |
189 | */ | |
1da177e4 | 190 | |
7232311e MD |
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 | /* Need to disable preemption for the cpu local counters otherwise we could | |
197 | still access a variable of a previous CPU in a non atomic way. */ | |
198 | #define cpu_local_wrap_v(l) \ | |
199 | ({ local_t res__; \ | |
200 | preempt_disable(); \ | |
201 | res__ = (l); \ | |
202 | preempt_enable(); \ | |
203 | res__; }) | |
204 | #define cpu_local_wrap(l) \ | |
205 | ({ preempt_disable(); \ | |
206 | l; \ | |
207 | preempt_enable(); }) \ | |
208 | ||
209 | #define cpu_local_read(l) cpu_local_wrap_v(local_read(&__get_cpu_var(l))) | |
210 | #define cpu_local_set(l, i) cpu_local_wrap(local_set(&__get_cpu_var(l), (i))) | |
211 | #define cpu_local_inc(l) cpu_local_wrap(local_inc(&__get_cpu_var(l))) | |
212 | #define cpu_local_dec(l) cpu_local_wrap(local_dec(&__get_cpu_var(l))) | |
213 | #define cpu_local_add(i, l) cpu_local_wrap(local_add((i), &__get_cpu_var(l))) | |
214 | #define cpu_local_sub(i, l) cpu_local_wrap(local_sub((i), &__get_cpu_var(l))) | |
1da177e4 | 215 | |
7232311e MD |
216 | #define __cpu_local_inc(l) cpu_local_inc(l) |
217 | #define __cpu_local_dec(l) cpu_local_dec(l) | |
218 | #define __cpu_local_add(i, l) cpu_local_add((i), (l)) | |
219 | #define __cpu_local_sub(i, l) cpu_local_sub((i), (l)) | |
1da177e4 | 220 | |
7232311e | 221 | #endif /* _ARCH_MIPS_LOCAL_H */ |