LXR linux/include/asm-x86/string

   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
  32#if (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4
  33extern void *memcpy(void *to, const void *from, size_t len);
  34#else
  35extern void *__memcpy(void *to, const void *from, size_t len); 
  36#define memcpy(dst,src,len) \
  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#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
  61