LXR linux/arch/x86/boot/compressed/string.c

   1#include "../string.c"
   2
   3#ifdef CONFIG_X86_32
   4void *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
  18void *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
  33void *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}
  42