include/asm-x86/string_64.h

   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 */
   9 static __always_inline void *
  10 __inline_memcpy(void * to, const void * from, size_t n)
  11 {
  12 unsigned 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");
  25 return (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
  33 extern void *memcpy(void *to, const void *from, size_t len);
  34 #else
  35 extern 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
  47 void *memset(void *s, int c, size_t n);
  48
  49 #define __HAVE_ARCH_MEMMOVE
  50 void * memmove(void * dest,const void *src,size_t count);
  51
  52 int memcmp(const void * cs,const void * ct,size_t count);
  53 size_t strlen(const char * s);
  54 char *strcpy(char * dest,const char *src);
  55 char *strcat(char * dest, const char * src);
  56 int strcmp(const char * cs,const char * ct);
  57
  58 #endif /* __KERNEL__ */
  59
  60 #endif