* The provided Makefile:
  1) builds a kernel
  2) copies it into rootfs/boot/kernel/kernel
  3) creates an ISO CD image with the rootfs/ contents

* To boot the system in QEMU, run:
qemu-system-x86_64 -curses -drive id=boot,format=raw,file=$USER.img,if=none -drive id=data,format=raw,file=$USER-data.img,if=none -device ahci,id=ahci -device ide-drive,drive=boot,bus=ahci.0 -device ide-drive,drive=data,bus=ahci.1 -gdb tcp::9999

Explanation of parameters:
  -curses         use a text console (omit this to use default SDL/VNC console)
  -drive ...      connect a CD-ROM or hard drive with corresponding image
  -device ...     configure an AHCI controller for the boot and data disks
  -gdb tcp::9999  listen for "remote" debugging connections on port NNNN
  -S              wait for GDB to connect at startup
  -no-reboot      prevent reboot when OS crashes

* When using the -curses mode, switch to the qemu> console with ESC-2.

* To connect a remote debugger to the running qemu VM, from a different window:
gdb ./kernel

At the (gdb) prompt, connect with:
target remote localhost:9999
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Course page : https://compas.cs.stonybrook.edu/courses/cse506-operating-systems-fall-17/cse506-project-hints/

References:
http://wiki.osdev.org
http://www.brokenthorn.com/Resources/OSDevIndex.html
http://www.jamesmolloy.co.uk/tutorial_html/10.-User%20Mode.html
http://www.osdever.net/bkerndev/Docs/keyboard.htm
http://duartes.org/gustavo/blog/post/how-the-kernel-manages-your-memory/
http://duartes.org/gustavo/blog/post/anatomy-of-a-program-in-memory/