jeremy/os-tutorial

tükrözi: https://github.com/cfenollosa/os-tutorial

Carlos 5aaabf189d lesson 20 finished: timer + keyboard		10 éve
..
kernel.c	5aaabf189d lesson 20 finished: timer + keyboard	10 éve
util.c	7797630a24 Lesson 20 step 1, the timer	10 éve
util.h	7797630a24 Lesson 20 step 1, the timer	10 éve