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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _X86_64_STRING_H_
2#define _X86_64_STRING_H_
3
4#ifdef __KERNEL__
5
Joe Perches953b2f12008-03-23 01:03:34 -07006/* Written 2002 by Andi Kleen */
Linus Torvalds1da177e2005-04-16 15:20:36 -07007
Joe Perches953b2f12008-03-23 01:03:34 -07008/* Only used for special circumstances. Stolen from i386/string.h */
9static __always_inline void *__inline_memcpy(void *to, const void *from, size_t n)
Linus Torvalds1da177e2005-04-16 15:20:36 -070010{
Joe Perches953b2f12008-03-23 01:03:34 -070011 unsigned long d0, d1, d2;
12 asm volatile("rep ; movsl\n\t"
13 "testb $2,%b4\n\t"
14 "je 1f\n\t"
15 "movsw\n"
16 "1:\ttestb $1,%b4\n\t"
17 "je 2f\n\t"
18 "movsb\n"
19 "2:"
20 : "=&c" (d0), "=&D" (d1), "=&S" (d2)
21 : "0" (n / 4), "q" (n), "1" ((long)to), "2" ((long)from)
22 : "memory");
23 return to;
Linus Torvalds1da177e2005-04-16 15:20:36 -070024}
25
26/* Even with __builtin_ the compiler may decide to use the out of line
27 function. */
28
29#define __HAVE_ARCH_MEMCPY 1
Andi Kleenaac57f82007-07-21 17:09:58 +020030#if (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4
31extern void *memcpy(void *to, const void *from, size_t len);
32#else
Joe Perches953b2f12008-03-23 01:03:34 -070033extern void *__memcpy(void *to, const void *from, size_t len);
34#define memcpy(dst, src, len) \
35({ \
36 size_t __len = (len); \
37 void *__ret; \
38 if (__builtin_constant_p(len) && __len >= 64) \
39 __ret = __memcpy((dst), (src), __len); \
40 else \
41 __ret = __builtin_memcpy((dst), (src), __len); \
42 __ret; \
43})
Andi Kleenaac57f82007-07-21 17:09:58 +020044#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46#define __HAVE_ARCH_MEMSET
Andi Kleen6edfba12006-03-25 16:29:49 +010047void *memset(void *s, int c, size_t n);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49#define __HAVE_ARCH_MEMMOVE
Joe Perches953b2f12008-03-23 01:03:34 -070050void *memmove(void *dest, const void *src, size_t count);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Joe Perches953b2f12008-03-23 01:03:34 -070052int memcmp(const void *cs, const void *ct, size_t count);
53size_t strlen(const char *s);
54char *strcpy(char *dest, const char *src);
55char *strcat(char *dest, const char *src);
56int strcmp(const char *cs, const char *ct);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58#endif /* __KERNEL__ */
59
60#endif