release/src-rt-6.x.4708/linux/linux-2.6.36/arch/x86/lib/memcpy_32.c

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