Comment by Jagat

I am a graduate student, currently working on building a x86_64 unix like preemptive kernel from scratch, as part of a course. Most of the OS dev guides and books focus on 32 bit arch and I haven't found a single guide so far that is based on 64 bit arch. Since this this guide seems to be in its inception, I hope someone (hopefully me) will send a pull request for a 64 bit tutorial.

Building an OS has been in my bucket list for long and it has been one heck of an experience so far.

Here are some good step-by-step OS-from-scratch programming guides

http://jamesmolloy.co.uk/tutorial_html/index.html

http://www.osdever.net/bkerndev/Docs/title.htm

http://www.ijack.org.uk/

http://www.brokenthorn.com/Resources/OSDevIndex.html

http://viralpatel.net/taj/operating-system-tutorial.php

and here's a good wiki for reference

http://wiki.osdev.org/Expanded_Main_Page