arch/i386/lib/memcpy.c

   1 #include <linux/config.h>
   2 #include <linux/string.h>
   3 #include <linux/module.h>
   4
   5 #undef memcpy
   6 #undef memset
   7
   8 void *memcpy(void *to, const void *from, size_t n)
   9 {
  10 #ifdef CONFIG_X86_USE_3DNOW
  11         return __memcpy3d(to, from, n);
  12 #else
  13         return __memcpy(to, from, n);
  14 #endif
  15 }
  16 EXPORT_SYMBOL(memcpy);
  17
  18 void *memset(void *s, int c, size_t count)
  19 {
  20         return __memset(s, c, count);
  21 }
  22 EXPORT_SYMBOL(memset);
  23
  24 void *memmove(void *dest, const void *src, size_t n)
  25 {
  26         int d0, d1, d2;
  27
  28         if (dest < src) {
  29                 memcpy(dest,src,n);
  30         } else {
  31                 __asm__ __volatile__(
  32                         "std\n\t"
  33                         "rep\n\t"
  34                         "movsb\n\t"
  35                         "cld"
  36                         : "=&c" (d0), "=&S" (d1), "=&D" (d2)
  37                         :"0" (n),
  38                          "1" (n-1+(const char *)src),
  39                          "2" (n-1+(char *)dest)
  40                         :"memory");
  41         }
  42         return dest;
  43 }
  44 EXPORT_SYMBOL(memmove);