1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_ATOMIC64_32_H
3 #define _ASM_X86_ATOMIC64_32_H
5 #include <linux/compiler.h>
6 #include <linux/types.h>
7 //#include <asm/cmpxchg.h>
9 /* An 64bit atomic type */
12 s64 __aligned(8) counter;
15 #define ATOMIC64_INIT(val) { (val) }
17 #define __ATOMIC64_DECL(sym) void atomic64_##sym(atomic64_t *, ...)
18 #ifndef ATOMIC64_EXPORT
19 #define ATOMIC64_DECL_ONE __ATOMIC64_DECL
21 #define ATOMIC64_DECL_ONE(sym) __ATOMIC64_DECL(sym); \
22 ATOMIC64_EXPORT(atomic64_##sym)
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)
30 #define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8)
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)
36 #define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8); \
37 ATOMIC64_DECL_ONE(sym##_386)
39 ATOMIC64_DECL_ONE(add_386);
40 ATOMIC64_DECL_ONE(sub_386);
41 ATOMIC64_DECL_ONE(inc_386);
42 ATOMIC64_DECL_ONE(dec_386);
45 #define alternative_atomic64(f, out, in...) \
46 __alternative_atomic64(f, f, ASM_OUTPUT2(out), ## in)
51 ATOMIC64_DECL(add_return);
52 ATOMIC64_DECL(sub_return);
53 ATOMIC64_DECL(inc_return);
54 ATOMIC64_DECL(dec_return);
55 ATOMIC64_DECL(dec_if_positive);
56 ATOMIC64_DECL(inc_not_zero);
57 ATOMIC64_DECL(add_unless);
60 #undef ATOMIC64_DECL_ONE
61 #undef __ATOMIC64_DECL
62 #undef ATOMIC64_EXPORT
65 * arch_atomic64_cmpxchg - cmpxchg atomic64 variable
66 * @v: pointer to type atomic64_t
70 * Atomically sets @v to @n if it was equal to @o and returns
74 static inline s64 arch_atomic64_cmpxchg(atomic64_t *v, s64 o, s64 n)
76 return arch_cmpxchg64(&v->counter, o, n);
80 * arch_atomic64_xchg - xchg atomic64 variable
81 * @v: pointer to type atomic64_t
84 * Atomically xchgs the value of @v to @n and returns
87 static inline s64 arch_atomic64_xchg(atomic64_t *v, s64 n)
90 unsigned high = (unsigned)(n >> 32);
91 unsigned low = (unsigned)n;
92 alternative_atomic64(xchg, "=&A" (o),
93 "S" (v), "b" (low), "c" (high)
99 * arch_atomic64_set - set atomic64 variable
100 * @v: pointer to type atomic64_t
101 * @i: value to assign
103 * Atomically sets the value of @v to @n.
105 static inline void arch_atomic64_set(atomic64_t *v, s64 i)
107 unsigned high = (unsigned)(i >> 32);
108 unsigned low = (unsigned)i;
109 alternative_atomic64(set, /* no output */,
110 "S" (v), "b" (low), "c" (high)
111 : "eax", "edx", "memory");
115 * arch_atomic64_read - read atomic64 variable
116 * @v: pointer to type atomic64_t
118 * Atomically reads the value of @v and returns it.
120 static inline s64 arch_atomic64_read(const atomic64_t *v)
123 alternative_atomic64(read, "=&A" (r), "c" (v) : "memory");
128 * arch_atomic64_add_return - add and return
129 * @i: integer value to add
130 * @v: pointer to type atomic64_t
132 * Atomically adds @i to @v and returns @i + *@v
134 static inline s64 arch_atomic64_add_return(s64 i, atomic64_t *v)
136 alternative_atomic64(add_return,
137 ASM_OUTPUT2("+A" (i), "+c" (v)),
138 ASM_NO_INPUT_CLOBBER("memory"));
143 * Other variants with different arithmetic operators:
145 static inline s64 arch_atomic64_sub_return(s64 i, atomic64_t *v)
147 alternative_atomic64(sub_return,
148 ASM_OUTPUT2("+A" (i), "+c" (v)),
149 ASM_NO_INPUT_CLOBBER("memory"));
153 static inline s64 arch_atomic64_inc_return(atomic64_t *v)
156 alternative_atomic64(inc_return, "=&A" (a),
157 "S" (v) : "memory", "ecx");
160 #define arch_atomic64_inc_return arch_atomic64_inc_return
162 static inline s64 arch_atomic64_dec_return(atomic64_t *v)
165 alternative_atomic64(dec_return, "=&A" (a),
166 "S" (v) : "memory", "ecx");
169 #define arch_atomic64_dec_return arch_atomic64_dec_return
172 * arch_atomic64_add - add integer to atomic64 variable
173 * @i: integer value to add
174 * @v: pointer to type atomic64_t
176 * Atomically adds @i to @v.
178 static inline s64 arch_atomic64_add(s64 i, atomic64_t *v)
180 __alternative_atomic64(add, add_return,
181 ASM_OUTPUT2("+A" (i), "+c" (v)),
182 ASM_NO_INPUT_CLOBBER("memory"));
187 * arch_atomic64_sub - subtract the atomic64 variable
188 * @i: integer value to subtract
189 * @v: pointer to type atomic64_t
191 * Atomically subtracts @i from @v.
193 static inline s64 arch_atomic64_sub(s64 i, atomic64_t *v)
195 __alternative_atomic64(sub, sub_return,
196 ASM_OUTPUT2("+A" (i), "+c" (v)),
197 ASM_NO_INPUT_CLOBBER("memory"));
202 * arch_atomic64_inc - increment atomic64 variable
203 * @v: pointer to type atomic64_t
205 * Atomically increments @v by 1.
207 static inline void arch_atomic64_inc(atomic64_t *v)
209 __alternative_atomic64(inc, inc_return, /* no output */,
210 "S" (v) : "memory", "eax", "ecx", "edx");
212 #define arch_atomic64_inc arch_atomic64_inc
215 * arch_atomic64_dec - decrement atomic64 variable
216 * @v: pointer to type atomic64_t
218 * Atomically decrements @v by 1.
220 static inline void arch_atomic64_dec(atomic64_t *v)
222 __alternative_atomic64(dec, dec_return, /* no output */,
223 "S" (v) : "memory", "eax", "ecx", "edx");
225 #define arch_atomic64_dec arch_atomic64_dec
228 * arch_atomic64_add_unless - add unless the number is a given value
229 * @v: pointer of type atomic64_t
230 * @a: the amount to add to v...
231 * @u: ...unless v is equal to u.
233 * Atomically adds @a to @v, so long as it was not @u.
234 * Returns non-zero if the add was done, zero otherwise.
236 static inline int arch_atomic64_add_unless(atomic64_t *v, s64 a, s64 u)
238 unsigned low = (unsigned)u;
239 unsigned high = (unsigned)(u >> 32);
240 alternative_atomic64(add_unless,
241 ASM_OUTPUT2("+A" (a), "+c" (low), "+D" (high)),
246 static inline int arch_atomic64_inc_not_zero(atomic64_t *v)
249 alternative_atomic64(inc_not_zero, "=&a" (r),
250 "S" (v) : "ecx", "edx", "memory");
253 #define arch_atomic64_inc_not_zero arch_atomic64_inc_not_zero
255 static inline s64 arch_atomic64_dec_if_positive(atomic64_t *v)
258 alternative_atomic64(dec_if_positive, "=&A" (r),
259 "S" (v) : "ecx", "memory");
262 #define arch_atomic64_dec_if_positive arch_atomic64_dec_if_positive
264 #undef alternative_atomic64
265 #undef __alternative_atomic64
267 static inline void arch_atomic64_and(s64 i, atomic64_t *v)
271 while ((old = arch_atomic64_cmpxchg(v, c, c & i)) != c)
275 static inline s64 arch_atomic64_fetch_and(s64 i, atomic64_t *v)
279 while ((old = arch_atomic64_cmpxchg(v, c, c & i)) != c)
285 static inline void arch_atomic64_or(s64 i, atomic64_t *v)
289 while ((old = arch_atomic64_cmpxchg(v, c, c | i)) != c)
293 static inline s64 arch_atomic64_fetch_or(s64 i, atomic64_t *v)
297 while ((old = arch_atomic64_cmpxchg(v, c, c | i)) != c)
303 static inline void arch_atomic64_xor(s64 i, atomic64_t *v)
307 while ((old = arch_atomic64_cmpxchg(v, c, c ^ i)) != c)
311 static inline s64 arch_atomic64_fetch_xor(s64 i, atomic64_t *v)
315 while ((old = arch_atomic64_cmpxchg(v, c, c ^ i)) != c)
321 static inline s64 arch_atomic64_fetch_add(s64 i, atomic64_t *v)
325 while ((old = arch_atomic64_cmpxchg(v, c, c + i)) != c)
331 #define arch_atomic64_fetch_sub(i, v) arch_atomic64_fetch_add(-(i), (v))
333 #endif /* _ASM_X86_ATOMIC64_32_H */