Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef _X86_64_STRING_H_
2#define _X86_64_STRING_H_
3
4#ifdef __KERNEL__
5
6/* Written 2002 by Andi Kleen */
7
8/* Only used for special circumstances. Stolen from i386/string.h */
9static __always_inline void *__inline_memcpy(void *to, const void *from, size_t n)
10{
11 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;
24}
25
26/* Even with __builtin_ the compiler may decide to use the out of line
27 function. */
28
29#define __HAVE_ARCH_MEMCPY 1
30#if (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4
31extern void *memcpy(void *to, const void *from, size_t len);
32#else
33extern 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})
44#endif
45
46#define __HAVE_ARCH_MEMSET
47void *memset(void *s, int c, size_t n);
48
49#define __HAVE_ARCH_MEMMOVE
50void *memmove(void *dest, const void *src, size_t count);
51
52int 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);
57
58#endif /* __KERNEL__ */
59
60#endif