Pileus Git - ~andy/linux/blob - 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                 if ((dest + n) < src)
  29                          return memcpy(dest, src, n);
  30                 else
  31                         __asm__ __volatile__(
  32                                 "rep\n\t"
  33                                 "movsb\n\t"
  34                                 : "=&c" (d0), "=&S" (d1), "=&D" (d2)
  35                                 :"0" (n),
  36                                  "1" (src),
  37                                  "2" (dest)
  38                                 :"memory");
  39         } else {
  40                 if((src + n) < dest)
  41                         return memcpy(dest, src, n);
  42                 else
  43                         __asm__ __volatile__(
  44                                 "std\n\t"
  45                                 "rep\n\t"
  46                                 "movsb\n\t"
  47                                 "cld"
  48                                 : "=&c" (d0), "=&S" (d1), "=&D" (d2)
  49                                 :"0" (n),
  50                                  "1" (n-1+src),
  51                                  "2" (n-1+dest)
  52                                 :"memory");
  53         }
  54
  55         return dest;
  56 }
  57 EXPORT_SYMBOL(memmove);