a new system call added to the kernel

the call is intended for x86_64 build
caller should cousult the corresponding syscall table
rather than the unistd.h file for call number
made a mirror of the ext2 filesystem

two patches for kernel v3.14.15
apply either 0400 or 0401 is sufficient
0498 was modified for correcting some errors from its original source
0403 runs a total test
added a file contains basic instructions