Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #ifndef _ALPHA_ATOMIC_H |
2 | #define _ALPHA_ATOMIC_H | |
3 | ||
ea435467 | 4 | #include <linux/types.h> |
0db9ae4a | 5 | #include <asm/barrier.h> |
5ba840f9 | 6 | #include <asm/cmpxchg.h> |
0db9ae4a | 7 | |
1da177e4 LT |
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 | ||
67a806d9 MG |
17 | #define ATOMIC_INIT(i) { (i) } |
18 | #define ATOMIC64_INIT(i) { (i) } | |
1da177e4 | 19 | |
f3d46f9d AB |
20 | #define atomic_read(v) (*(volatile int *)&(v)->counter) |
21 | #define atomic64_read(v) (*(volatile long *)&(v)->counter) | |
1da177e4 LT |
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 | */ | |
26a6e661 | 96 | static inline int atomic_add_return(int i, atomic_t *v) |
1da177e4 LT |
97 | { |
98 | long temp, result; | |
d475f3f4 | 99 | smp_mb(); |
1da177e4 LT |
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" | |
1da177e4 LT |
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"); | |
d475f3f4 | 111 | smp_mb(); |
1da177e4 LT |
112 | return result; |
113 | } | |
114 | ||
1da177e4 LT |
115 | static __inline__ long atomic64_add_return(long i, atomic64_t * v) |
116 | { | |
117 | long temp, result; | |
d475f3f4 | 118 | smp_mb(); |
1da177e4 LT |
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" | |
1da177e4 LT |
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"); | |
d475f3f4 | 130 | smp_mb(); |
1da177e4 LT |
131 | return result; |
132 | } | |
133 | ||
134 | static __inline__ long atomic_sub_return(int i, atomic_t * v) | |
135 | { | |
136 | long temp, result; | |
d475f3f4 | 137 | smp_mb(); |
1da177e4 LT |
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" | |
1da177e4 LT |
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"); | |
d475f3f4 | 149 | smp_mb(); |
1da177e4 LT |
150 | return result; |
151 | } | |
152 | ||
153 | static __inline__ long atomic64_sub_return(long i, atomic64_t * v) | |
154 | { | |
155 | long temp, result; | |
d475f3f4 | 156 | smp_mb(); |
1da177e4 LT |
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" | |
1da177e4 LT |
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"); | |
d475f3f4 | 168 | smp_mb(); |
1da177e4 LT |
169 | return result; |
170 | } | |
171 | ||
e96e6994 MD |
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)) | |
ffbf670f | 176 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
4a6dae6d | 177 | |
e96e6994 | 178 | /** |
f24219b4 | 179 | * __atomic_add_unless - add unless the number is a given value |
e96e6994 MD |
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. | |
f24219b4 | 185 | * Returns the old value of @v. |
e96e6994 | 186 | */ |
f24219b4 | 187 | static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u) |
2856f5e3 | 188 | { |
6da75397 RH |
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; | |
2856f5e3 MD |
207 | } |
208 | ||
8426e1f6 | 209 | |
e96e6994 MD |
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. | |
6da75397 | 217 | * Returns true iff @v was not @u. |
e96e6994 | 218 | */ |
2856f5e3 MD |
219 | static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u) |
220 | { | |
6da75397 RH |
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; | |
2856f5e3 MD |
239 | } |
240 | ||
748a76b5 RH |
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 | ||
e96e6994 MD |
269 | #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) |
270 | ||
7c72aaf2 HD |
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 | ||
1da177e4 LT |
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) | |
7c72aaf2 HD |
284 | #define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0) |
285 | ||
1da177e4 LT |
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 */ |