1#ifndef _ASM_X86_STRING_64_H 2#define _ASM_X86_STRING_64_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#ifndef CONFIG_KMEMCHECK 31#if (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4 32extern void *memcpy(void *to, const void *from, size_t len); 33#else 34extern void *__memcpy(void *to, const void *from, size_t len); 35#define memcpy(dst, src, len) \ 36({ \ 37 size_t __len = (len); \ 38 void *__ret; \ 39 if (__builtin_constant_p(len) && __len >= 64) \ 40 __ret = __memcpy((dst), (src), __len); \ 41 else \ 42 __ret = __builtin_memcpy((dst), (src), __len); \ 43 __ret; \ 44}) 45#endif 46#else 47/* 48 * kmemcheck becomes very happy if we use the REP instructions unconditionally, 49 * because it means that we know both memory operands in advance. 50 */ 51#define memcpy(dst, src, len) __inline_memcpy((dst), (src), (len)) 52#endif 53 54#define __HAVE_ARCH_MEMSET 55void *memset(void *s, int c, size_t n); 56 57#define __HAVE_ARCH_MEMMOVE 58void *memmove(void *dest, const void *src, size_t count); 59 60int memcmp(const void *cs, const void *ct, size_t count); 61size_t strlen(const char *s); 62char *strcpy(char *dest, const char *src); 63char *strcat(char *dest, const char *src); 64int strcmp(const char *cs, const char *ct); 65 66#endif /* __KERNEL__ */ 67 68#endif /* _ASM_X86_STRING_64_H */ 69