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 * 10__inline_memcpy(void * to, const void * from, size_t n) 11{ 12unsigned long d0, d1, d2; 13__asm__ __volatile__( 14 "rep ; movsl\n\t" 15 "testb $2,%b4\n\t" 16 "je 1f\n\t" 17 "movsw\n" 18 "1:\ttestb $1,%b4\n\t" 19 "je 2f\n\t" 20 "movsb\n" 21 "2:" 22 : "=&c" (d0), "=&D" (d1), "=&S" (d2) 23 :"0" (n/4), "q" (n),"1" ((long) to),"2" ((long) from) 24 : "memory"); 25return (to); 26} 27 28/* Even with __builtin_ the compiler may decide to use the out of line 29 function. */ 30 31#define __HAVE_ARCH_MEMCPY 1 32extern void *__memcpy(void *to, const void *from, size_t len); 33#define memcpy(dst,src,len) \ 34 ({ size_t __len = (len); \ 35 void *__ret; \ 36 if (__builtin_constant_p(len) && __len >= 64) \ 37 __ret = __memcpy((dst),(src),__len); \ 38 else \ 39 __ret = __builtin_memcpy((dst),(src),__len); \ 40 __ret; }) 41 42 43#define __HAVE_ARCH_MEMSET 44void *memset(void *s, int c, size_t n); 45 46#define __HAVE_ARCH_MEMMOVE 47void * memmove(void * dest,const void *src,size_t count); 48 49int memcmp(const void * cs,const void * ct,size_t count); 50size_t strlen(const char * s); 51char *strcpy(char * dest,const char *src); 52char *strcat(char * dest, const char * src); 53int strcmp(const char * cs,const char * ct); 54 55#endif /* __KERNEL__ */ 56 57#endif 58