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Linux/arch/alpha/include/asm/atomic.h

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  1 #ifndef _ALPHA_ATOMIC_H
  2 #define _ALPHA_ATOMIC_H
  3 
  4 #include <linux/types.h>
  5 #include <asm/barrier.h>
  6 #include <asm/cmpxchg.h>
  7 
  8 /*
  9  * Atomic operations that C can't guarantee us.  Useful for
 10  * resource counting etc...
 11  *
 12  * But use these as seldom as possible since they are much slower
 13  * than regular operations.
 14  */
 15 
 16 
 17 #define ATOMIC_INIT(i)          { (i) }
 18 #define ATOMIC64_INIT(i)        { (i) }
 19 
 20 #define atomic_read(v)          (*(volatile int *)&(v)->counter)
 21 #define atomic64_read(v)        (*(volatile long *)&(v)->counter)
 22 
 23 #define atomic_set(v,i)         ((v)->counter = (i))
 24 #define atomic64_set(v,i)       ((v)->counter = (i))
 25 
 26 /*
 27  * To get proper branch prediction for the main line, we must branch
 28  * forward to code at the end of this object's .text section, then
 29  * branch back to restart the operation.
 30  */
 31 
 32 static __inline__ void atomic_add(int i, atomic_t * v)
 33 {
 34         unsigned long temp;
 35         __asm__ __volatile__(
 36         "1:     ldl_l %0,%1\n"
 37         "       addl %0,%2,%0\n"
 38         "       stl_c %0,%1\n"
 39         "       beq %0,2f\n"
 40         ".subsection 2\n"
 41         "2:     br 1b\n"
 42         ".previous"
 43         :"=&r" (temp), "=m" (v->counter)
 44         :"Ir" (i), "m" (v->counter));
 45 }
 46 
 47 static __inline__ void atomic64_add(long i, atomic64_t * v)
 48 {
 49         unsigned long temp;
 50         __asm__ __volatile__(
 51         "1:     ldq_l %0,%1\n"
 52         "       addq %0,%2,%0\n"
 53         "       stq_c %0,%1\n"
 54         "       beq %0,2f\n"
 55         ".subsection 2\n"
 56         "2:     br 1b\n"
 57         ".previous"
 58         :"=&r" (temp), "=m" (v->counter)
 59         :"Ir" (i), "m" (v->counter));
 60 }
 61 
 62 static __inline__ void atomic_sub(int i, atomic_t * v)
 63 {
 64         unsigned long temp;
 65         __asm__ __volatile__(
 66         "1:     ldl_l %0,%1\n"
 67         "       subl %0,%2,%0\n"
 68         "       stl_c %0,%1\n"
 69         "       beq %0,2f\n"
 70         ".subsection 2\n"
 71         "2:     br 1b\n"
 72         ".previous"
 73         :"=&r" (temp), "=m" (v->counter)
 74         :"Ir" (i), "m" (v->counter));
 75 }
 76 
 77 static __inline__ void atomic64_sub(long i, atomic64_t * v)
 78 {
 79         unsigned long temp;
 80         __asm__ __volatile__(
 81         "1:     ldq_l %0,%1\n"
 82         "       subq %0,%2,%0\n"
 83         "       stq_c %0,%1\n"
 84         "       beq %0,2f\n"
 85         ".subsection 2\n"
 86         "2:     br 1b\n"
 87         ".previous"
 88         :"=&r" (temp), "=m" (v->counter)
 89         :"Ir" (i), "m" (v->counter));
 90 }
 91 
 92 
 93 /*
 94  * Same as above, but return the result value
 95  */
 96 static inline int atomic_add_return(int i, atomic_t *v)
 97 {
 98         long temp, result;
 99         smp_mb();
100         __asm__ __volatile__(
101         "1:     ldl_l %0,%1\n"
102         "       addl %0,%3,%2\n"
103         "       addl %0,%3,%0\n"
104         "       stl_c %0,%1\n"
105         "       beq %0,2f\n"
106         ".subsection 2\n"
107         "2:     br 1b\n"
108         ".previous"
109         :"=&r" (temp), "=m" (v->counter), "=&r" (result)
110         :"Ir" (i), "m" (v->counter) : "memory");
111         smp_mb();
112         return result;
113 }
114 
115 static __inline__ long atomic64_add_return(long i, atomic64_t * v)
116 {
117         long temp, result;
118         smp_mb();
119         __asm__ __volatile__(
120         "1:     ldq_l %0,%1\n"
121         "       addq %0,%3,%2\n"
122         "       addq %0,%3,%0\n"
123         "       stq_c %0,%1\n"
124         "       beq %0,2f\n"
125         ".subsection 2\n"
126         "2:     br 1b\n"
127         ".previous"
128         :"=&r" (temp), "=m" (v->counter), "=&r" (result)
129         :"Ir" (i), "m" (v->counter) : "memory");
130         smp_mb();
131         return result;
132 }
133 
134 static __inline__ long atomic_sub_return(int i, atomic_t * v)
135 {
136         long temp, result;
137         smp_mb();
138         __asm__ __volatile__(
139         "1:     ldl_l %0,%1\n"
140         "       subl %0,%3,%2\n"
141         "       subl %0,%3,%0\n"
142         "       stl_c %0,%1\n"
143         "       beq %0,2f\n"
144         ".subsection 2\n"
145         "2:     br 1b\n"
146         ".previous"
147         :"=&r" (temp), "=m" (v->counter), "=&r" (result)
148         :"Ir" (i), "m" (v->counter) : "memory");
149         smp_mb();
150         return result;
151 }
152 
153 static __inline__ long atomic64_sub_return(long i, atomic64_t * v)
154 {
155         long temp, result;
156         smp_mb();
157         __asm__ __volatile__(
158         "1:     ldq_l %0,%1\n"
159         "       subq %0,%3,%2\n"
160         "       subq %0,%3,%0\n"
161         "       stq_c %0,%1\n"
162         "       beq %0,2f\n"
163         ".subsection 2\n"
164         "2:     br 1b\n"
165         ".previous"
166         :"=&r" (temp), "=m" (v->counter), "=&r" (result)
167         :"Ir" (i), "m" (v->counter) : "memory");
168         smp_mb();
169         return result;
170 }
171 
172 #define atomic64_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
173 #define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
174 
175 #define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
176 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
177 
178 /**
179  * __atomic_add_unless - add unless the number is a given value
180  * @v: pointer of type atomic_t
181  * @a: the amount to add to v...
182  * @u: ...unless v is equal to u.
183  *
184  * Atomically adds @a to @v, so long as it was not @u.
185  * Returns the old value of @v.
186  */
187 static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
188 {
189         int c, new, old;
190         smp_mb();
191         __asm__ __volatile__(
192         "1:     ldl_l   %[old],%[mem]\n"
193         "       cmpeq   %[old],%[u],%[c]\n"
194         "       addl    %[old],%[a],%[new]\n"
195         "       bne     %[c],2f\n"
196         "       stl_c   %[new],%[mem]\n"
197         "       beq     %[new],3f\n"
198         "2:\n"
199         ".subsection 2\n"
200         "3:     br      1b\n"
201         ".previous"
202         : [old] "=&r"(old), [new] "=&r"(new), [c] "=&r"(c)
203         : [mem] "m"(*v), [a] "rI"(a), [u] "rI"((long)u)
204         : "memory");
205         smp_mb();
206         return old;
207 }
208 
209 
210 /**
211  * atomic64_add_unless - add unless the number is a given value
212  * @v: pointer of type atomic64_t
213  * @a: the amount to add to v...
214  * @u: ...unless v is equal to u.
215  *
216  * Atomically adds @a to @v, so long as it was not @u.
217  * Returns true iff @v was not @u.
218  */
219 static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
220 {
221         long c, tmp;
222         smp_mb();
223         __asm__ __volatile__(
224         "1:     ldq_l   %[tmp],%[mem]\n"
225         "       cmpeq   %[tmp],%[u],%[c]\n"
226         "       addq    %[tmp],%[a],%[tmp]\n"
227         "       bne     %[c],2f\n"
228         "       stq_c   %[tmp],%[mem]\n"
229         "       beq     %[tmp],3f\n"
230         "2:\n"
231         ".subsection 2\n"
232         "3:     br      1b\n"
233         ".previous"
234         : [tmp] "=&r"(tmp), [c] "=&r"(c)
235         : [mem] "m"(*v), [a] "rI"(a), [u] "rI"(u)
236         : "memory");
237         smp_mb();
238         return !c;
239 }
240 
241 /*
242  * atomic64_dec_if_positive - decrement by 1 if old value positive
243  * @v: pointer of type atomic_t
244  *
245  * The function returns the old value of *v minus 1, even if
246  * the atomic variable, v, was not decremented.
247  */
248 static inline long atomic64_dec_if_positive(atomic64_t *v)
249 {
250         long old, tmp;
251         smp_mb();
252         __asm__ __volatile__(
253         "1:     ldq_l   %[old],%[mem]\n"
254         "       subq    %[old],1,%[tmp]\n"
255         "       ble     %[old],2f\n"
256         "       stq_c   %[tmp],%[mem]\n"
257         "       beq     %[tmp],3f\n"
258         "2:\n"
259         ".subsection 2\n"
260         "3:     br      1b\n"
261         ".previous"
262         : [old] "=&r"(old), [tmp] "=&r"(tmp)
263         : [mem] "m"(*v)
264         : "memory");
265         smp_mb();
266         return old - 1;
267 }
268 
269 #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
270 
271 #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
272 #define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)
273 
274 #define atomic_dec_return(v) atomic_sub_return(1,(v))
275 #define atomic64_dec_return(v) atomic64_sub_return(1,(v))
276 
277 #define atomic_inc_return(v) atomic_add_return(1,(v))
278 #define atomic64_inc_return(v) atomic64_add_return(1,(v))
279 
280 #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
281 #define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0)
282 
283 #define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
284 #define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0)
285 
286 #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
287 #define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0)
288 
289 #define atomic_inc(v) atomic_add(1,(v))
290 #define atomic64_inc(v) atomic64_add(1,(v))
291 
292 #define atomic_dec(v) atomic_sub(1,(v))
293 #define atomic64_dec(v) atomic64_sub(1,(v))
294 
295 #define smp_mb__before_atomic_dec()     smp_mb()
296 #define smp_mb__after_atomic_dec()      smp_mb()
297 #define smp_mb__before_atomic_inc()     smp_mb()
298 #define smp_mb__after_atomic_inc()      smp_mb()
299 
300 #endif /* _ALPHA_ATOMIC_H */
301 

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