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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 | |
2291059c PK |
20 | #define atomic_read(v) ACCESS_ONCE((v)->counter) |
21 | #define atomic64_read(v) ACCESS_ONCE((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 | ||
b93c7b8c PZ |
32 | #define ATOMIC_OP(op) \ |
33 | static __inline__ void atomic_##op(int i, atomic_t * v) \ | |
34 | { \ | |
35 | unsigned long temp; \ | |
36 | __asm__ __volatile__( \ | |
37 | "1: ldl_l %0,%1\n" \ | |
38 | " " #op "l %0,%2,%0\n" \ | |
39 | " stl_c %0,%1\n" \ | |
40 | " beq %0,2f\n" \ | |
41 | ".subsection 2\n" \ | |
42 | "2: br 1b\n" \ | |
43 | ".previous" \ | |
44 | :"=&r" (temp), "=m" (v->counter) \ | |
45 | :"Ir" (i), "m" (v->counter)); \ | |
46 | } \ | |
47 | ||
48 | #define ATOMIC_OP_RETURN(op) \ | |
49 | static inline int atomic_##op##_return(int i, atomic_t *v) \ | |
50 | { \ | |
51 | long temp, result; \ | |
52 | smp_mb(); \ | |
53 | __asm__ __volatile__( \ | |
54 | "1: ldl_l %0,%1\n" \ | |
55 | " " #op "l %0,%3,%2\n" \ | |
56 | " " #op "l %0,%3,%0\n" \ | |
57 | " stl_c %0,%1\n" \ | |
58 | " beq %0,2f\n" \ | |
59 | ".subsection 2\n" \ | |
60 | "2: br 1b\n" \ | |
61 | ".previous" \ | |
62 | :"=&r" (temp), "=m" (v->counter), "=&r" (result) \ | |
63 | :"Ir" (i), "m" (v->counter) : "memory"); \ | |
64 | smp_mb(); \ | |
65 | return result; \ | |
1da177e4 LT |
66 | } |
67 | ||
b93c7b8c PZ |
68 | #define ATOMIC64_OP(op) \ |
69 | static __inline__ void atomic64_##op(long i, atomic64_t * v) \ | |
70 | { \ | |
71 | unsigned long temp; \ | |
72 | __asm__ __volatile__( \ | |
73 | "1: ldq_l %0,%1\n" \ | |
74 | " " #op "q %0,%2,%0\n" \ | |
75 | " stq_c %0,%1\n" \ | |
76 | " beq %0,2f\n" \ | |
77 | ".subsection 2\n" \ | |
78 | "2: br 1b\n" \ | |
79 | ".previous" \ | |
80 | :"=&r" (temp), "=m" (v->counter) \ | |
81 | :"Ir" (i), "m" (v->counter)); \ | |
82 | } \ | |
83 | ||
84 | #define ATOMIC64_OP_RETURN(op) \ | |
85 | static __inline__ long atomic64_##op##_return(long i, atomic64_t * v) \ | |
86 | { \ | |
87 | long temp, result; \ | |
88 | smp_mb(); \ | |
89 | __asm__ __volatile__( \ | |
90 | "1: ldq_l %0,%1\n" \ | |
91 | " " #op "q %0,%3,%2\n" \ | |
92 | " " #op "q %0,%3,%0\n" \ | |
93 | " stq_c %0,%1\n" \ | |
94 | " beq %0,2f\n" \ | |
95 | ".subsection 2\n" \ | |
96 | "2: br 1b\n" \ | |
97 | ".previous" \ | |
98 | :"=&r" (temp), "=m" (v->counter), "=&r" (result) \ | |
99 | :"Ir" (i), "m" (v->counter) : "memory"); \ | |
100 | smp_mb(); \ | |
101 | return result; \ | |
1da177e4 LT |
102 | } |
103 | ||
b93c7b8c PZ |
104 | #define ATOMIC_OPS(opg) \ |
105 | ATOMIC_OP(opg) \ | |
106 | ATOMIC_OP_RETURN(opg) \ | |
107 | ATOMIC64_OP(opg) \ | |
108 | ATOMIC64_OP_RETURN(opg) | |
1da177e4 | 109 | |
b93c7b8c PZ |
110 | ATOMIC_OPS(add) |
111 | ATOMIC_OPS(sub) | |
1da177e4 | 112 | |
b93c7b8c PZ |
113 | #undef ATOMIC_OPS |
114 | #undef ATOMIC64_OP_RETURN | |
115 | #undef ATOMIC64_OP | |
116 | #undef ATOMIC_OP_RETURN | |
117 | #undef ATOMIC_OP | |
1da177e4 | 118 | |
e96e6994 MD |
119 | #define atomic64_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new)) |
120 | #define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) | |
121 | ||
122 | #define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new)) | |
ffbf670f | 123 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
4a6dae6d | 124 | |
e96e6994 | 125 | /** |
f24219b4 | 126 | * __atomic_add_unless - add unless the number is a given value |
e96e6994 MD |
127 | * @v: pointer of type atomic_t |
128 | * @a: the amount to add to v... | |
129 | * @u: ...unless v is equal to u. | |
130 | * | |
131 | * Atomically adds @a to @v, so long as it was not @u. | |
f24219b4 | 132 | * Returns the old value of @v. |
e96e6994 | 133 | */ |
f24219b4 | 134 | static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u) |
2856f5e3 | 135 | { |
6da75397 RH |
136 | int c, new, old; |
137 | smp_mb(); | |
138 | __asm__ __volatile__( | |
139 | "1: ldl_l %[old],%[mem]\n" | |
140 | " cmpeq %[old],%[u],%[c]\n" | |
141 | " addl %[old],%[a],%[new]\n" | |
142 | " bne %[c],2f\n" | |
143 | " stl_c %[new],%[mem]\n" | |
144 | " beq %[new],3f\n" | |
145 | "2:\n" | |
146 | ".subsection 2\n" | |
147 | "3: br 1b\n" | |
148 | ".previous" | |
149 | : [old] "=&r"(old), [new] "=&r"(new), [c] "=&r"(c) | |
150 | : [mem] "m"(*v), [a] "rI"(a), [u] "rI"((long)u) | |
151 | : "memory"); | |
152 | smp_mb(); | |
153 | return old; | |
2856f5e3 MD |
154 | } |
155 | ||
8426e1f6 | 156 | |
e96e6994 MD |
157 | /** |
158 | * atomic64_add_unless - add unless the number is a given value | |
159 | * @v: pointer of type atomic64_t | |
160 | * @a: the amount to add to v... | |
161 | * @u: ...unless v is equal to u. | |
162 | * | |
163 | * Atomically adds @a to @v, so long as it was not @u. | |
6da75397 | 164 | * Returns true iff @v was not @u. |
e96e6994 | 165 | */ |
2856f5e3 MD |
166 | static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u) |
167 | { | |
6da75397 RH |
168 | long c, tmp; |
169 | smp_mb(); | |
170 | __asm__ __volatile__( | |
171 | "1: ldq_l %[tmp],%[mem]\n" | |
172 | " cmpeq %[tmp],%[u],%[c]\n" | |
173 | " addq %[tmp],%[a],%[tmp]\n" | |
174 | " bne %[c],2f\n" | |
175 | " stq_c %[tmp],%[mem]\n" | |
176 | " beq %[tmp],3f\n" | |
177 | "2:\n" | |
178 | ".subsection 2\n" | |
179 | "3: br 1b\n" | |
180 | ".previous" | |
181 | : [tmp] "=&r"(tmp), [c] "=&r"(c) | |
182 | : [mem] "m"(*v), [a] "rI"(a), [u] "rI"(u) | |
183 | : "memory"); | |
184 | smp_mb(); | |
185 | return !c; | |
2856f5e3 MD |
186 | } |
187 | ||
748a76b5 RH |
188 | /* |
189 | * atomic64_dec_if_positive - decrement by 1 if old value positive | |
190 | * @v: pointer of type atomic_t | |
191 | * | |
192 | * The function returns the old value of *v minus 1, even if | |
193 | * the atomic variable, v, was not decremented. | |
194 | */ | |
195 | static inline long atomic64_dec_if_positive(atomic64_t *v) | |
196 | { | |
197 | long old, tmp; | |
198 | smp_mb(); | |
199 | __asm__ __volatile__( | |
200 | "1: ldq_l %[old],%[mem]\n" | |
201 | " subq %[old],1,%[tmp]\n" | |
202 | " ble %[old],2f\n" | |
203 | " stq_c %[tmp],%[mem]\n" | |
204 | " beq %[tmp],3f\n" | |
205 | "2:\n" | |
206 | ".subsection 2\n" | |
207 | "3: br 1b\n" | |
208 | ".previous" | |
209 | : [old] "=&r"(old), [tmp] "=&r"(tmp) | |
210 | : [mem] "m"(*v) | |
211 | : "memory"); | |
212 | smp_mb(); | |
213 | return old - 1; | |
214 | } | |
215 | ||
e96e6994 MD |
216 | #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) |
217 | ||
7c72aaf2 HD |
218 | #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) |
219 | #define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0) | |
220 | ||
1da177e4 LT |
221 | #define atomic_dec_return(v) atomic_sub_return(1,(v)) |
222 | #define atomic64_dec_return(v) atomic64_sub_return(1,(v)) | |
223 | ||
224 | #define atomic_inc_return(v) atomic_add_return(1,(v)) | |
225 | #define atomic64_inc_return(v) atomic64_add_return(1,(v)) | |
226 | ||
227 | #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) | |
228 | #define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0) | |
229 | ||
230 | #define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0) | |
7c72aaf2 HD |
231 | #define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0) |
232 | ||
1da177e4 LT |
233 | #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) |
234 | #define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0) | |
235 | ||
236 | #define atomic_inc(v) atomic_add(1,(v)) | |
237 | #define atomic64_inc(v) atomic64_add(1,(v)) | |
238 | ||
239 | #define atomic_dec(v) atomic_sub(1,(v)) | |
240 | #define atomic64_dec(v) atomic64_sub(1,(v)) | |
241 | ||
1da177e4 | 242 | #endif /* _ALPHA_ATOMIC_H */ |