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1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_STRING_64_H
3 #define _ASM_X86_STRING_64_H
4 
5 #ifdef __KERNEL__
6 #include <linux/jump_label.h>
7 
8 /* Written 2002 by Andi Kleen */
9 
10 /* Even with __builtin_ the compiler may decide to use the out of line
11    function. */
12 
13 #define __HAVE_ARCH_MEMCPY 1
14 extern void *memcpy(void *to, const void *from, size_t len);
15 extern void *__memcpy(void *to, const void *from, size_t len);
16 
17 #define __HAVE_ARCH_MEMSET
18 void *memset(void *s, int c, size_t n);
19 void *__memset(void *s, int c, size_t n);
20 
21 #define __HAVE_ARCH_MEMSET16
memset16(uint16_t * s,uint16_t v,size_t n)22 static inline void *memset16(uint16_t *s, uint16_t v, size_t n)
23 {
24 	long d0, d1;
25 	asm volatile("rep\n\t"
26 		     "stosw"
27 		     : "=&c" (d0), "=&D" (d1)
28 		     : "a" (v), "1" (s), "0" (n)
29 		     : "memory");
30 	return s;
31 }
32 
33 #define __HAVE_ARCH_MEMSET32
memset32(uint32_t * s,uint32_t v,size_t n)34 static inline void *memset32(uint32_t *s, uint32_t v, size_t n)
35 {
36 	long d0, d1;
37 	asm volatile("rep\n\t"
38 		     "stosl"
39 		     : "=&c" (d0), "=&D" (d1)
40 		     : "a" (v), "1" (s), "0" (n)
41 		     : "memory");
42 	return s;
43 }
44 
45 #define __HAVE_ARCH_MEMSET64
memset64(uint64_t * s,uint64_t v,size_t n)46 static inline void *memset64(uint64_t *s, uint64_t v, size_t n)
47 {
48 	long d0, d1;
49 	asm volatile("rep\n\t"
50 		     "stosq"
51 		     : "=&c" (d0), "=&D" (d1)
52 		     : "a" (v), "1" (s), "0" (n)
53 		     : "memory");
54 	return s;
55 }
56 
57 #define __HAVE_ARCH_MEMMOVE
58 void *memmove(void *dest, const void *src, size_t count);
59 void *__memmove(void *dest, const void *src, size_t count);
60 
61 int memcmp(const void *cs, const void *ct, size_t count);
62 size_t strlen(const char *s);
63 char *strcpy(char *dest, const char *src);
64 char *strcat(char *dest, const char *src);
65 int strcmp(const char *cs, const char *ct);
66 
67 #if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
68 
69 /*
70  * For files that not instrumented (e.g. mm/slub.c) we
71  * should use not instrumented version of mem* functions.
72  */
73 
74 #undef memcpy
75 #define memcpy(dst, src, len) __memcpy(dst, src, len)
76 #define memmove(dst, src, len) __memmove(dst, src, len)
77 #define memset(s, c, n) __memset(s, c, n)
78 
79 #ifndef __NO_FORTIFY
80 #define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */
81 #endif
82 
83 #endif
84 
85 #ifdef CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE
86 #define __HAVE_ARCH_MEMCPY_FLUSHCACHE 1
87 void __memcpy_flushcache(void *dst, const void *src, size_t cnt);
memcpy_flushcache(void * dst,const void * src,size_t cnt)88 static __always_inline void memcpy_flushcache(void *dst, const void *src, size_t cnt)
89 {
90 	if (__builtin_constant_p(cnt)) {
91 		switch (cnt) {
92 			case 4:
93 				asm ("movntil %1, %0" : "=m"(*(u32 *)dst) : "r"(*(u32 *)src));
94 				return;
95 			case 8:
96 				asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src));
97 				return;
98 			case 16:
99 				asm ("movntiq %1, %0" : "=m"(*(u64 *)dst) : "r"(*(u64 *)src));
100 				asm ("movntiq %1, %0" : "=m"(*(u64 *)(dst + 8)) : "r"(*(u64 *)(src + 8)));
101 				return;
102 		}
103 	}
104 	__memcpy_flushcache(dst, src, cnt);
105 }
106 #endif
107 
108 #endif /* __KERNEL__ */
109 
110 #endif /* _ASM_X86_STRING_64_H */
111