1
2#ifndef _ASM_X86_ATOMIC64_32_H
3#define _ASM_X86_ATOMIC64_32_H
4
5#include <linux/compiler.h>
6#include <linux/types.h>
7
8
9
10
11typedef struct {
12 s64 __aligned(8) counter;
13} atomic64_t;
14
15#define ATOMIC64_INIT(val) { (val) }
16
17#define __ATOMIC64_DECL(sym) void atomic64_##sym(atomic64_t *, ...)
18#ifndef ATOMIC64_EXPORT
19#define ATOMIC64_DECL_ONE __ATOMIC64_DECL
20#else
21#define ATOMIC64_DECL_ONE(sym) __ATOMIC64_DECL(sym); \
22 ATOMIC64_EXPORT(atomic64_##sym)
23#endif
24
25#ifdef CONFIG_X86_CMPXCHG64
26#define __alternative_atomic64(f, g, out, in...) \
27 asm volatile("call %P[func]" \
28 : out : [func] "i" (atomic64_##g##_cx8), ## in)
29
30#define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8)
31#else
32#define __alternative_atomic64(f, g, out, in...) \
33 alternative_call(atomic64_##f##_386, atomic64_##g##_cx8, \
34 X86_FEATURE_CX8, ASM_OUTPUT2(out), ## in)
35
36#define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8); \
37 ATOMIC64_DECL_ONE(sym##_386)
38
39ATOMIC64_DECL_ONE(add_386);
40ATOMIC64_DECL_ONE(sub_386);
41ATOMIC64_DECL_ONE(inc_386);
42ATOMIC64_DECL_ONE(dec_386);
43#endif
44
45#define alternative_atomic64(f, out, in...) \
46 __alternative_atomic64(f, f, ASM_OUTPUT2(out), ## in)
47
48ATOMIC64_DECL(read);
49ATOMIC64_DECL(set);
50ATOMIC64_DECL(xchg);
51ATOMIC64_DECL(add_return);
52ATOMIC64_DECL(sub_return);
53ATOMIC64_DECL(inc_return);
54ATOMIC64_DECL(dec_return);
55ATOMIC64_DECL(dec_if_positive);
56ATOMIC64_DECL(inc_not_zero);
57ATOMIC64_DECL(add_unless);
58
59#undef ATOMIC64_DECL
60#undef ATOMIC64_DECL_ONE
61#undef __ATOMIC64_DECL
62#undef ATOMIC64_EXPORT
63
64
65
66
67
68
69
70
71
72
73
74static inline s64 arch_atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n)
75{
76 return arch_cmpxchg64(&v->counter, o, n);
77}
78#define arch_atomic64_cmpxchg arch_atomic64_cmpxchg
79
80
81
82
83
84
85
86
87
88static inline s64 arch_atomic64_xchg(atomic64_t *v, s64 n)
89{
90 s64 o;
91 unsigned high = (unsigned)(n >> 32);
92 unsigned low = (unsigned)n;
93 alternative_atomic64(xchg, "=&A" (o),
94 "S" (v), "b" (low), "c" (high)
95 : "memory");
96 return o;
97}
98#define arch_atomic64_xchg arch_atomic64_xchg
99
100
101
102
103
104
105
106
107static inline void arch_atomic64_set(atomic64_t *v, s64 i)
108{
109 unsigned high = (unsigned)(i >> 32);
110 unsigned low = (unsigned)i;
111 alternative_atomic64(set, ,
112 "S" (v), "b" (low), "c" (high)
113 : "eax", "edx", "memory");
114}
115
116
117
118
119
120
121
122static inline s64 arch_atomic64_read(const atomic64_t *v)
123{
124 s64 r;
125 alternative_atomic64(read, "=&A" (r), "c" (v) : "memory");
126 return r;
127}
128
129
130
131
132
133
134
135
136static inline s64 arch_atomic64_add_return(s64 i, atomic64_t *v)
137{
138 alternative_atomic64(add_return,
139 ASM_OUTPUT2("+A" (i), "+c" (v)),
140 ASM_NO_INPUT_CLOBBER("memory"));
141 return i;
142}
143#define arch_atomic64_add_return arch_atomic64_add_return
144
145
146
147
148static inline s64 arch_atomic64_sub_return(s64 i, atomic64_t *v)
149{
150 alternative_atomic64(sub_return,
151 ASM_OUTPUT2("+A" (i), "+c" (v)),
152 ASM_NO_INPUT_CLOBBER("memory"));
153 return i;
154}
155#define arch_atomic64_sub_return arch_atomic64_sub_return
156
157static inline s64 arch_atomic64_inc_return(atomic64_t *v)
158{
159 s64 a;
160 alternative_atomic64(inc_return, "=&A" (a),
161 "S" (v) : "memory", "ecx");
162 return a;
163}
164#define arch_atomic64_inc_return arch_atomic64_inc_return
165
166static inline s64 arch_atomic64_dec_return(atomic64_t *v)
167{
168 s64 a;
169 alternative_atomic64(dec_return, "=&A" (a),
170 "S" (v) : "memory", "ecx");
171 return a;
172}
173#define arch_atomic64_dec_return arch_atomic64_dec_return
174
175
176
177
178
179
180
181
182static inline s64 arch_atomic64_add(s64 i, atomic64_t *v)
183{
184 __alternative_atomic64(add, add_return,
185 ASM_OUTPUT2("+A" (i), "+c" (v)),
186 ASM_NO_INPUT_CLOBBER("memory"));
187 return i;
188}
189
190
191
192
193
194
195
196
197static inline s64 arch_atomic64_sub(s64 i, atomic64_t *v)
198{
199 __alternative_atomic64(sub, sub_return,
200 ASM_OUTPUT2("+A" (i), "+c" (v)),
201 ASM_NO_INPUT_CLOBBER("memory"));
202 return i;
203}
204
205
206
207
208
209
210
211static inline void arch_atomic64_inc(atomic64_t *v)
212{
213 __alternative_atomic64(inc, inc_return, ,
214 "S" (v) : "memory", "eax", "ecx", "edx");
215}
216#define arch_atomic64_inc arch_atomic64_inc
217
218
219
220
221
222
223
224static inline void arch_atomic64_dec(atomic64_t *v)
225{
226 __alternative_atomic64(dec, dec_return, ,
227 "S" (v) : "memory", "eax", "ecx", "edx");
228}
229#define arch_atomic64_dec arch_atomic64_dec
230
231
232
233
234
235
236
237
238
239
240static inline int arch_atomic64_add_unless(atomic64_t *v, s64 a, s64 u)
241{
242 unsigned low = (unsigned)u;
243 unsigned high = (unsigned)(u >> 32);
244 alternative_atomic64(add_unless,
245 ASM_OUTPUT2("+A" (a), "+c" (low), "+D" (high)),
246 "S" (v) : "memory");
247 return (int)a;
248}
249#define arch_atomic64_add_unless arch_atomic64_add_unless
250
251static inline int arch_atomic64_inc_not_zero(atomic64_t *v)
252{
253 int r;
254 alternative_atomic64(inc_not_zero, "=&a" (r),
255 "S" (v) : "ecx", "edx", "memory");
256 return r;
257}
258#define arch_atomic64_inc_not_zero arch_atomic64_inc_not_zero
259
260static inline s64 arch_atomic64_dec_if_positive(atomic64_t *v)
261{
262 s64 r;
263 alternative_atomic64(dec_if_positive, "=&A" (r),
264 "S" (v) : "ecx", "memory");
265 return r;
266}
267#define arch_atomic64_dec_if_positive arch_atomic64_dec_if_positive
268
269#undef alternative_atomic64
270#undef __alternative_atomic64
271
272static inline void arch_atomic64_and(s64 i, atomic64_t *v)
273{
274 s64 old, c = 0;
275
276 while ((old = arch_atomic64_cmpxchg(v, c, c & i)) != c)
277 c = old;
278}
279
280static inline s64 arch_atomic64_fetch_and(s64 i, atomic64_t *v)
281{
282 s64 old, c = 0;
283
284 while ((old = arch_atomic64_cmpxchg(v, c, c & i)) != c)
285 c = old;
286
287 return old;
288}
289#define arch_atomic64_fetch_and arch_atomic64_fetch_and
290
291static inline void arch_atomic64_or(s64 i, atomic64_t *v)
292{
293 s64 old, c = 0;
294
295 while ((old = arch_atomic64_cmpxchg(v, c, c | i)) != c)
296 c = old;
297}
298
299static inline s64 arch_atomic64_fetch_or(s64 i, atomic64_t *v)
300{
301 s64 old, c = 0;
302
303 while ((old = arch_atomic64_cmpxchg(v, c, c | i)) != c)
304 c = old;
305
306 return old;
307}
308#define arch_atomic64_fetch_or arch_atomic64_fetch_or
309
310static inline void arch_atomic64_xor(s64 i, atomic64_t *v)
311{
312 s64 old, c = 0;
313
314 while ((old = arch_atomic64_cmpxchg(v, c, c ^ i)) != c)
315 c = old;
316}
317
318static inline s64 arch_atomic64_fetch_xor(s64 i, atomic64_t *v)
319{
320 s64 old, c = 0;
321
322 while ((old = arch_atomic64_cmpxchg(v, c, c ^ i)) != c)
323 c = old;
324
325 return old;
326}
327#define arch_atomic64_fetch_xor arch_atomic64_fetch_xor
328
329static inline s64 arch_atomic64_fetch_add(s64 i, atomic64_t *v)
330{
331 s64 old, c = 0;
332
333 while ((old = arch_atomic64_cmpxchg(v, c, c + i)) != c)
334 c = old;
335
336 return old;
337}
338#define arch_atomic64_fetch_add arch_atomic64_fetch_add
339
340#define arch_atomic64_fetch_sub(i, v) arch_atomic64_fetch_add(-(i), (v))
341
342#endif
343