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1#ifndef _ASM_X86_ATOMIC64_32_H
2#define _ASM_X86_ATOMIC64_32_H
3
4#include <linux/compiler.h>
5#include <linux/types.h>
6//#include <asm/cmpxchg.h>
7
8/* An 64bit atomic type */
9
10typedef struct {
11 u64 __aligned(8) counter;
12} atomic64_t;
13
14#define ATOMIC64_INIT(val) { (val) }
15
16#define __ATOMIC64_DECL(sym) void atomic64_##sym(atomic64_t *, ...)
17#ifndef ATOMIC64_EXPORT
18#define ATOMIC64_DECL_ONE __ATOMIC64_DECL
19#else
20#define ATOMIC64_DECL_ONE(sym) __ATOMIC64_DECL(sym); \
21 ATOMIC64_EXPORT(atomic64_##sym)
22#endif
23
24#ifdef CONFIG_X86_CMPXCHG64
25#define __alternative_atomic64(f, g, out, in...) \
26 asm volatile("call %P[func]" \
27 : out : [func] "i" (atomic64_##g##_cx8), ## in)
28
29#define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8)
30#else
31#define __alternative_atomic64(f, g, out, in...) \
32 alternative_call(atomic64_##f##_386, atomic64_##g##_cx8, \
33 X86_FEATURE_CX8, ASM_OUTPUT2(out), ## in)
34
35#define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8); \
36 ATOMIC64_DECL_ONE(sym##_386)
37
38ATOMIC64_DECL_ONE(add_386);
39ATOMIC64_DECL_ONE(sub_386);
40ATOMIC64_DECL_ONE(inc_386);
41ATOMIC64_DECL_ONE(dec_386);
42#endif
43
44#define alternative_atomic64(f, out, in...) \
45 __alternative_atomic64(f, f, ASM_OUTPUT2(out), ## in)
46
47ATOMIC64_DECL(read);
48ATOMIC64_DECL(set);
49ATOMIC64_DECL(xchg);
50ATOMIC64_DECL(add_return);
51ATOMIC64_DECL(sub_return);
52ATOMIC64_DECL(inc_return);
53ATOMIC64_DECL(dec_return);
54ATOMIC64_DECL(dec_if_positive);
55ATOMIC64_DECL(inc_not_zero);
56ATOMIC64_DECL(add_unless);
57
58#undef ATOMIC64_DECL
59#undef ATOMIC64_DECL_ONE
60#undef __ATOMIC64_DECL
61#undef ATOMIC64_EXPORT
62
63/**
64 * atomic64_cmpxchg - cmpxchg atomic64 variable
65 * @v: pointer to type atomic64_t
66 * @o: expected value
67 * @n: new value
68 *
69 * Atomically sets @v to @n if it was equal to @o and returns
70 * the old value.
71 */
72
73static inline long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n)
74{
75 return cmpxchg64(&v->counter, o, n);
76}
77
78/**
79 * atomic64_xchg - xchg atomic64 variable
80 * @v: pointer to type atomic64_t
81 * @n: value to assign
82 *
83 * Atomically xchgs the value of @v to @n and returns
84 * the old value.
85 */
86static inline long long atomic64_xchg(atomic64_t *v, long long n)
87{
88 long long o;
89 unsigned high = (unsigned)(n >> 32);
90 unsigned low = (unsigned)n;
91 alternative_atomic64(xchg, "=&A" (o),
92 "S" (v), "b" (low), "c" (high)
93 : "memory");
94 return o;
95}
96
97/**
98 * atomic64_set - set atomic64 variable
99 * @v: pointer to type atomic64_t
100 * @i: value to assign
101 *
102 * Atomically sets the value of @v to @n.
103 */
104static inline void atomic64_set(atomic64_t *v, long long i)
105{
106 unsigned high = (unsigned)(i >> 32);
107 unsigned low = (unsigned)i;
108 alternative_atomic64(set, /* no output */,
109 "S" (v), "b" (low), "c" (high)
110 : "eax", "edx", "memory");
111}
112
113/**
114 * atomic64_read - read atomic64 variable
115 * @v: pointer to type atomic64_t
116 *
117 * Atomically reads the value of @v and returns it.
118 */
119static inline long long atomic64_read(const atomic64_t *v)
120{
121 long long r;
122 alternative_atomic64(read, "=&A" (r), "c" (v) : "memory");
123 return r;
124 }
125
126/**
127 * atomic64_add_return - add and return
128 * @i: integer value to add
129 * @v: pointer to type atomic64_t
130 *
131 * Atomically adds @i to @v and returns @i + *@v
132 */
133static inline long long atomic64_add_return(long long i, atomic64_t *v)
134{
135 alternative_atomic64(add_return,
136 ASM_OUTPUT2("+A" (i), "+c" (v)),
137 ASM_NO_INPUT_CLOBBER("memory"));
138 return i;
139}
140
141/*
142 * Other variants with different arithmetic operators:
143 */
144static inline long long atomic64_sub_return(long long i, atomic64_t *v)
145{
146 alternative_atomic64(sub_return,
147 ASM_OUTPUT2("+A" (i), "+c" (v)),
148 ASM_NO_INPUT_CLOBBER("memory"));
149 return i;
150}
151
152static inline long long atomic64_inc_return(atomic64_t *v)
153{
154 long long a;
155 alternative_atomic64(inc_return, "=&A" (a),
156 "S" (v) : "memory", "ecx");
157 return a;
158}
159
160static inline long long atomic64_dec_return(atomic64_t *v)
161{
162 long long a;
163 alternative_atomic64(dec_return, "=&A" (a),
164 "S" (v) : "memory", "ecx");
165 return a;
166}
167
168/**
169 * atomic64_add - add integer to atomic64 variable
170 * @i: integer value to add
171 * @v: pointer to type atomic64_t
172 *
173 * Atomically adds @i to @v.
174 */
175static inline long long atomic64_add(long long i, atomic64_t *v)
176{
177 __alternative_atomic64(add, add_return,
178 ASM_OUTPUT2("+A" (i), "+c" (v)),
179 ASM_NO_INPUT_CLOBBER("memory"));
180 return i;
181}
182
183/**
184 * atomic64_sub - subtract the atomic64 variable
185 * @i: integer value to subtract
186 * @v: pointer to type atomic64_t
187 *
188 * Atomically subtracts @i from @v.
189 */
190static inline long long atomic64_sub(long long i, atomic64_t *v)
191{
192 __alternative_atomic64(sub, sub_return,
193 ASM_OUTPUT2("+A" (i), "+c" (v)),
194 ASM_NO_INPUT_CLOBBER("memory"));
195 return i;
196}
197
198/**
199 * atomic64_sub_and_test - subtract value from variable and test result
200 * @i: integer value to subtract
201 * @v: pointer to type atomic64_t
202 *
203 * Atomically subtracts @i from @v and returns
204 * true if the result is zero, or false for all
205 * other cases.
206 */
207static inline int atomic64_sub_and_test(long long i, atomic64_t *v)
208{
209 return atomic64_sub_return(i, v) == 0;
210}
211
212/**
213 * atomic64_inc - increment atomic64 variable
214 * @v: pointer to type atomic64_t
215 *
216 * Atomically increments @v by 1.
217 */
218static inline void atomic64_inc(atomic64_t *v)
219{
220 __alternative_atomic64(inc, inc_return, /* no output */,
221 "S" (v) : "memory", "eax", "ecx", "edx");
222}
223
224/**
225 * atomic64_dec - decrement atomic64 variable
226 * @v: pointer to type atomic64_t
227 *
228 * Atomically decrements @v by 1.
229 */
230static inline void atomic64_dec(atomic64_t *v)
231{
232 __alternative_atomic64(dec, dec_return, /* no output */,
233 "S" (v) : "memory", "eax", "ecx", "edx");
234}
235
236/**
237 * atomic64_dec_and_test - decrement and test
238 * @v: pointer to type atomic64_t
239 *
240 * Atomically decrements @v by 1 and
241 * returns true if the result is 0, or false for all other
242 * cases.
243 */
244static inline int atomic64_dec_and_test(atomic64_t *v)
245{
246 return atomic64_dec_return(v) == 0;
247}
248
249/**
250 * atomic64_inc_and_test - increment and test
251 * @v: pointer to type atomic64_t
252 *
253 * Atomically increments @v by 1
254 * and returns true if the result is zero, or false for all
255 * other cases.
256 */
257static inline int atomic64_inc_and_test(atomic64_t *v)
258{
259 return atomic64_inc_return(v) == 0;
260}
261
262/**
263 * atomic64_add_negative - add and test if negative
264 * @i: integer value to add
265 * @v: pointer to type atomic64_t
266 *
267 * Atomically adds @i to @v and returns true
268 * if the result is negative, or false when
269 * result is greater than or equal to zero.
270 */
271static inline int atomic64_add_negative(long long i, atomic64_t *v)
272{
273 return atomic64_add_return(i, v) < 0;
274}
275
276/**
277 * atomic64_add_unless - add unless the number is a given value
278 * @v: pointer of type atomic64_t
279 * @a: the amount to add to v...
280 * @u: ...unless v is equal to u.
281 *
282 * Atomically adds @a to @v, so long as it was not @u.
283 * Returns non-zero if the add was done, zero otherwise.
284 */
285static inline int atomic64_add_unless(atomic64_t *v, long long a, long long u)
286{
287 unsigned low = (unsigned)u;
288 unsigned high = (unsigned)(u >> 32);
289 alternative_atomic64(add_unless,
290 ASM_OUTPUT2("+A" (a), "+c" (low), "+D" (high)),
291 "S" (v) : "memory");
292 return (int)a;
293}
294
295
296static inline int atomic64_inc_not_zero(atomic64_t *v)
297{
298 int r;
299 alternative_atomic64(inc_not_zero, "=&a" (r),
300 "S" (v) : "ecx", "edx", "memory");
301 return r;
302}
303
304static inline long long atomic64_dec_if_positive(atomic64_t *v)
305{
306 long long r;
307 alternative_atomic64(dec_if_positive, "=&A" (r),
308 "S" (v) : "ecx", "memory");
309 return r;
310}
311
312#undef alternative_atomic64
313#undef __alternative_atomic64
314
315#define ATOMIC64_OP(op, c_op) \
316static inline void atomic64_##op(long long i, atomic64_t *v) \
317{ \
318 long long old, c = 0; \
319 while ((old = atomic64_cmpxchg(v, c, c c_op i)) != c) \
320 c = old; \
321}
322
323ATOMIC64_OP(and, &)
324ATOMIC64_OP(or, |)
325ATOMIC64_OP(xor, ^)
326
327#undef ATOMIC64_OP
328
329#endif /* _ASM_X86_ATOMIC64_32_H */
1/* SPDX-License-Identifier: GPL-2.0 */
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//#include <asm/cmpxchg.h>
8
9/* An 64bit atomic type */
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
64static __always_inline s64 arch_atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n)
65{
66 return arch_cmpxchg64(&v->counter, o, n);
67}
68#define arch_atomic64_cmpxchg arch_atomic64_cmpxchg
69
70static __always_inline s64 arch_atomic64_xchg(atomic64_t *v, s64 n)
71{
72 s64 o;
73 unsigned high = (unsigned)(n >> 32);
74 unsigned low = (unsigned)n;
75 alternative_atomic64(xchg, "=&A" (o),
76 "S" (v), "b" (low), "c" (high)
77 : "memory");
78 return o;
79}
80#define arch_atomic64_xchg arch_atomic64_xchg
81
82static __always_inline void arch_atomic64_set(atomic64_t *v, s64 i)
83{
84 unsigned high = (unsigned)(i >> 32);
85 unsigned low = (unsigned)i;
86 alternative_atomic64(set, /* no output */,
87 "S" (v), "b" (low), "c" (high)
88 : "eax", "edx", "memory");
89}
90
91static __always_inline s64 arch_atomic64_read(const atomic64_t *v)
92{
93 s64 r;
94 alternative_atomic64(read, "=&A" (r), "c" (v) : "memory");
95 return r;
96}
97
98static __always_inline s64 arch_atomic64_add_return(s64 i, atomic64_t *v)
99{
100 alternative_atomic64(add_return,
101 ASM_OUTPUT2("+A" (i), "+c" (v)),
102 ASM_NO_INPUT_CLOBBER("memory"));
103 return i;
104}
105#define arch_atomic64_add_return arch_atomic64_add_return
106
107static __always_inline s64 arch_atomic64_sub_return(s64 i, atomic64_t *v)
108{
109 alternative_atomic64(sub_return,
110 ASM_OUTPUT2("+A" (i), "+c" (v)),
111 ASM_NO_INPUT_CLOBBER("memory"));
112 return i;
113}
114#define arch_atomic64_sub_return arch_atomic64_sub_return
115
116static __always_inline s64 arch_atomic64_inc_return(atomic64_t *v)
117{
118 s64 a;
119 alternative_atomic64(inc_return, "=&A" (a),
120 "S" (v) : "memory", "ecx");
121 return a;
122}
123#define arch_atomic64_inc_return arch_atomic64_inc_return
124
125static __always_inline s64 arch_atomic64_dec_return(atomic64_t *v)
126{
127 s64 a;
128 alternative_atomic64(dec_return, "=&A" (a),
129 "S" (v) : "memory", "ecx");
130 return a;
131}
132#define arch_atomic64_dec_return arch_atomic64_dec_return
133
134static __always_inline s64 arch_atomic64_add(s64 i, atomic64_t *v)
135{
136 __alternative_atomic64(add, add_return,
137 ASM_OUTPUT2("+A" (i), "+c" (v)),
138 ASM_NO_INPUT_CLOBBER("memory"));
139 return i;
140}
141
142static __always_inline s64 arch_atomic64_sub(s64 i, atomic64_t *v)
143{
144 __alternative_atomic64(sub, sub_return,
145 ASM_OUTPUT2("+A" (i), "+c" (v)),
146 ASM_NO_INPUT_CLOBBER("memory"));
147 return i;
148}
149
150static __always_inline void arch_atomic64_inc(atomic64_t *v)
151{
152 __alternative_atomic64(inc, inc_return, /* no output */,
153 "S" (v) : "memory", "eax", "ecx", "edx");
154}
155#define arch_atomic64_inc arch_atomic64_inc
156
157static __always_inline void arch_atomic64_dec(atomic64_t *v)
158{
159 __alternative_atomic64(dec, dec_return, /* no output */,
160 "S" (v) : "memory", "eax", "ecx", "edx");
161}
162#define arch_atomic64_dec arch_atomic64_dec
163
164static __always_inline int arch_atomic64_add_unless(atomic64_t *v, s64 a, s64 u)
165{
166 unsigned low = (unsigned)u;
167 unsigned high = (unsigned)(u >> 32);
168 alternative_atomic64(add_unless,
169 ASM_OUTPUT2("+A" (a), "+c" (low), "+D" (high)),
170 "S" (v) : "memory");
171 return (int)a;
172}
173#define arch_atomic64_add_unless arch_atomic64_add_unless
174
175static __always_inline int arch_atomic64_inc_not_zero(atomic64_t *v)
176{
177 int r;
178 alternative_atomic64(inc_not_zero, "=&a" (r),
179 "S" (v) : "ecx", "edx", "memory");
180 return r;
181}
182#define arch_atomic64_inc_not_zero arch_atomic64_inc_not_zero
183
184static __always_inline s64 arch_atomic64_dec_if_positive(atomic64_t *v)
185{
186 s64 r;
187 alternative_atomic64(dec_if_positive, "=&A" (r),
188 "S" (v) : "ecx", "memory");
189 return r;
190}
191#define arch_atomic64_dec_if_positive arch_atomic64_dec_if_positive
192
193#undef alternative_atomic64
194#undef __alternative_atomic64
195
196static __always_inline void arch_atomic64_and(s64 i, atomic64_t *v)
197{
198 s64 old, c = 0;
199
200 while ((old = arch_atomic64_cmpxchg(v, c, c & i)) != c)
201 c = old;
202}
203
204static __always_inline s64 arch_atomic64_fetch_and(s64 i, atomic64_t *v)
205{
206 s64 old, c = 0;
207
208 while ((old = arch_atomic64_cmpxchg(v, c, c & i)) != c)
209 c = old;
210
211 return old;
212}
213#define arch_atomic64_fetch_and arch_atomic64_fetch_and
214
215static __always_inline void arch_atomic64_or(s64 i, atomic64_t *v)
216{
217 s64 old, c = 0;
218
219 while ((old = arch_atomic64_cmpxchg(v, c, c | i)) != c)
220 c = old;
221}
222
223static __always_inline s64 arch_atomic64_fetch_or(s64 i, atomic64_t *v)
224{
225 s64 old, c = 0;
226
227 while ((old = arch_atomic64_cmpxchg(v, c, c | i)) != c)
228 c = old;
229
230 return old;
231}
232#define arch_atomic64_fetch_or arch_atomic64_fetch_or
233
234static __always_inline void arch_atomic64_xor(s64 i, atomic64_t *v)
235{
236 s64 old, c = 0;
237
238 while ((old = arch_atomic64_cmpxchg(v, c, c ^ i)) != c)
239 c = old;
240}
241
242static __always_inline s64 arch_atomic64_fetch_xor(s64 i, atomic64_t *v)
243{
244 s64 old, c = 0;
245
246 while ((old = arch_atomic64_cmpxchg(v, c, c ^ i)) != c)
247 c = old;
248
249 return old;
250}
251#define arch_atomic64_fetch_xor arch_atomic64_fetch_xor
252
253static __always_inline s64 arch_atomic64_fetch_add(s64 i, atomic64_t *v)
254{
255 s64 old, c = 0;
256
257 while ((old = arch_atomic64_cmpxchg(v, c, c + i)) != c)
258 c = old;
259
260 return old;
261}
262#define arch_atomic64_fetch_add arch_atomic64_fetch_add
263
264#define arch_atomic64_fetch_sub(i, v) arch_atomic64_fetch_add(-(i), (v))
265
266#endif /* _ASM_X86_ATOMIC64_32_H */