Accessing physical address from user space through mmaped dev/mem

C code to get physical address from user space through mmap, without any kernel crash(if you are patient enough and read the rest of the readme :).

How to run successfully

See the credits.

Credit

I just wrapped out things together to demonstrate. Guys in this stackoverflow question actually explained everything well.

Reference

https://lwn.net/Articles/267427/

http://lxr.free-electrons.com/source/arch/x86/mm/pat.c#L703