arch/x86/boot/compressed/string.c

   1 #include "../string.c"
   2
   3 #ifdef CONFIG_X86_32
   4 void *memcpy(void *dest, const void *src, size_t n)
   5 {
   6         int d0, d1, d2;
   7         asm volatile(
   8                 "rep ; movsl\n\t"
   9                 "movl %4,%%ecx\n\t"
  10                 "rep ; movsb\n\t"
  11                 : "=&c" (d0), "=&D" (d1), "=&S" (d2)
  12                 : "0" (n >> 2), "g" (n & 3), "1" (dest), "2" (src)
  13                 : "memory");
  14
  15         return dest;
  16 }
  17 #else
  18 void *memcpy(void *dest, const void *src, size_t n)
  19 {
  20         long d0, d1, d2;
  21         asm volatile(
  22                 "rep ; movsq\n\t"
  23                 "movq %4,%%rcx\n\t"
  24                 "rep ; movsb\n\t"
  25                 : "=&c" (d0), "=&D" (d1), "=&S" (d2)
  26                 : "0" (n >> 3), "g" (n & 7), "1" (dest), "2" (src)
  27                 : "memory");
  28
  29         return dest;
  30 }
  31 #endif
  32
  33 void *memset(void *s, int c, size_t n)
  34 {
  35         int i;
  36         char *ss = s;
  37
  38         for (i = 0; i < n; i++)
  39                 ss[i] = c;
  40         return s;
  41 }