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TOMOYO Linux Cross Reference
Linux/arch/mips/include/asm/local.h

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  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/compiler.h>
  9 #include <asm/war.h>
 10 
 11 typedef struct
 12 {
 13         atomic_long_t a;
 14 } local_t;
 15 
 16 #define LOCAL_INIT(i)   { ATOMIC_LONG_INIT(i) }
 17 
 18 #define local_read(l)   atomic_long_read(&(l)->a)
 19 #define local_set(l, i) atomic_long_set(&(l)->a, (i))
 20 
 21 #define local_add(i, l) atomic_long_add((i), (&(l)->a))
 22 #define local_sub(i, l) atomic_long_sub((i), (&(l)->a))
 23 #define local_inc(l)    atomic_long_inc(&(l)->a)
 24 #define local_dec(l)    atomic_long_dec(&(l)->a)
 25 
 26 /*
 27  * Same as above, but return the result value
 28  */
 29 static __inline__ long local_add_return(long i, local_t * l)
 30 {
 31         unsigned long result;
 32 
 33         if (kernel_uses_llsc && R10000_LLSC_WAR) {
 34                 unsigned long temp;
 35 
 36                 __asm__ __volatile__(
 37                 "       .set    arch=r4000                              \n"
 38                 "1:"    __LL    "%1, %2         # local_add_return      \n"
 39                 "       addu    %0, %1, %3                              \n"
 40                         __SC    "%0, %2                                 \n"
 41                 "       beqzl   %0, 1b                                  \n"
 42                 "       addu    %0, %1, %3                              \n"
 43                 "       .set    mips0                                   \n"
 44                 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
 45                 : "Ir" (i), "m" (l->a.counter)
 46                 : "memory");
 47         } else if (kernel_uses_llsc) {
 48                 unsigned long temp;
 49 
 50                 __asm__ __volatile__(
 51                 "       .set    "MIPS_ISA_ARCH_LEVEL"                   \n"
 52                 "1:"    __LL    "%1, %2         # local_add_return      \n"
 53                 "       addu    %0, %1, %3                              \n"
 54                         __SC    "%0, %2                                 \n"
 55                 "       beqz    %0, 1b                                  \n"
 56                 "       addu    %0, %1, %3                              \n"
 57                 "       .set    mips0                                   \n"
 58                 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
 59                 : "Ir" (i), "m" (l->a.counter)
 60                 : "memory");
 61         } else {
 62                 unsigned long flags;
 63 
 64                 local_irq_save(flags);
 65                 result = l->a.counter;
 66                 result += i;
 67                 l->a.counter = result;
 68                 local_irq_restore(flags);
 69         }
 70 
 71         return result;
 72 }
 73 
 74 static __inline__ long local_sub_return(long i, local_t * l)
 75 {
 76         unsigned long result;
 77 
 78         if (kernel_uses_llsc && R10000_LLSC_WAR) {
 79                 unsigned long temp;
 80 
 81                 __asm__ __volatile__(
 82                 "       .set    arch=r4000                              \n"
 83                 "1:"    __LL    "%1, %2         # local_sub_return      \n"
 84                 "       subu    %0, %1, %3                              \n"
 85                         __SC    "%0, %2                                 \n"
 86                 "       beqzl   %0, 1b                                  \n"
 87                 "       subu    %0, %1, %3                              \n"
 88                 "       .set    mips0                                   \n"
 89                 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
 90                 : "Ir" (i), "m" (l->a.counter)
 91                 : "memory");
 92         } else if (kernel_uses_llsc) {
 93                 unsigned long temp;
 94 
 95                 __asm__ __volatile__(
 96                 "       .set    "MIPS_ISA_ARCH_LEVEL"                   \n"
 97                 "1:"    __LL    "%1, %2         # local_sub_return      \n"
 98                 "       subu    %0, %1, %3                              \n"
 99                         __SC    "%0, %2                                 \n"
100                 "       beqz    %0, 1b                                  \n"
101                 "       subu    %0, %1, %3                              \n"
102                 "       .set    mips0                                   \n"
103                 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
104                 : "Ir" (i), "m" (l->a.counter)
105                 : "memory");
106         } else {
107                 unsigned long flags;
108 
109                 local_irq_save(flags);
110                 result = l->a.counter;
111                 result -= i;
112                 l->a.counter = result;
113                 local_irq_restore(flags);
114         }
115 
116         return result;
117 }
118 
119 #define local_cmpxchg(l, o, n) \
120         ((long)cmpxchg_local(&((l)->a.counter), (o), (n)))
121 #define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n)))
122 
123 /**
124  * local_add_unless - add unless the number is a given value
125  * @l: pointer of type local_t
126  * @a: the amount to add to l...
127  * @u: ...unless l is equal to u.
128  *
129  * Atomically adds @a to @l, so long as it was not @u.
130  * Returns non-zero if @l was not @u, and zero otherwise.
131  */
132 #define local_add_unless(l, a, u)                               \
133 ({                                                              \
134         long c, old;                                            \
135         c = local_read(l);                                      \
136         while (c != (u) && (old = local_cmpxchg((l), c, c + (a))) != c) \
137                 c = old;                                        \
138         c != (u);                                               \
139 })
140 #define local_inc_not_zero(l) local_add_unless((l), 1, 0)
141 
142 #define local_dec_return(l) local_sub_return(1, (l))
143 #define local_inc_return(l) local_add_return(1, (l))
144 
145 /*
146  * local_sub_and_test - subtract value from variable and test result
147  * @i: integer value to subtract
148  * @l: pointer of type local_t
149  *
150  * Atomically subtracts @i from @l and returns
151  * true if the result is zero, or false for all
152  * other cases.
153  */
154 #define local_sub_and_test(i, l) (local_sub_return((i), (l)) == 0)
155 
156 /*
157  * local_inc_and_test - increment and test
158  * @l: pointer of type local_t
159  *
160  * Atomically increments @l by 1
161  * and returns true if the result is zero, or false for all
162  * other cases.
163  */
164 #define local_inc_and_test(l) (local_inc_return(l) == 0)
165 
166 /*
167  * local_dec_and_test - decrement by 1 and test
168  * @l: pointer of type local_t
169  *
170  * Atomically decrements @l by 1 and
171  * returns true if the result is 0, or false for all other
172  * cases.
173  */
174 #define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
175 
176 /*
177  * local_add_negative - add and test if negative
178  * @l: pointer of type local_t
179  * @i: integer value to add
180  *
181  * Atomically adds @i to @l and returns true
182  * if the result is negative, or false when
183  * result is greater than or equal to zero.
184  */
185 #define local_add_negative(i, l) (local_add_return(i, (l)) < 0)
186 
187 /* Use these for per-cpu local_t variables: on some archs they are
188  * much more efficient than these naive implementations.  Note they take
189  * a variable, not an address.
190  */
191 
192 #define __local_inc(l)          ((l)->a.counter++)
193 #define __local_dec(l)          ((l)->a.counter++)
194 #define __local_add(i, l)       ((l)->a.counter+=(i))
195 #define __local_sub(i, l)       ((l)->a.counter-=(i))
196 
197 #endif /* _ARCH_MIPS_LOCAL_H */
198 

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