/* *  NOTE!!! memcpy(dest,src,n) assumes ds=es=normal data segment. This *  goes for all kernel functions (ds=es=kernel space, fs=local data, *  gs=null), as well as for all well-behaving user programs (ds=es= *  user data space). This is NOT a bug, as any user program that changes *  es deserves to die if it isn't careful. */#define memcpy(dest,src,n) ({ \void * _res = dest; \__asm__ ("cld;rep;movsb" \	::"D" ((long)(_res)),"S" ((long)(src)),"c" ((long) (n)) \	:"di","si","cx"); \_res; \})