https://github.com/cs107e/cs107e.github.io
http://wiki.osdev.org/Calling_Conventions
http://wiki.osdev.org/Linker_Scripts
http://wiki.osdev.org/Printing_To_Screen
http://wiki.osdev.org/Exceptions#General_Protection_Fault
https://en.wikipedia.org/wiki/X86_calling_conventions
https://github.com/FlingOS/FlingOS
http://repo.or.cz/w/lightOS.git
https://littleosbook.github.io/
http://www.muppetlabs.com/~breadbox/software/tiny/teensy.html

http://x86.renejeschke.de/html/file_module_x86_id_139.html
http://retired.beyondlogic.org/serial/serial1.htm
https://pdos.csail.mit.edu/6.828/2014/reference.html