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 -cdrom $USER.iso -hda $USER.img -gdb tcp::NNNN

	Explanation of parameters:
	-curses         use a text console (omit this to use default SDL/VNC console)
	-cdrom x.iso    connect a CD-ROM and insert CD with x.iso disk
	-hda x.img      connect a hard drive with x.img disk
	-gdb tcp::NNNN  listen for "remote" debugging connections on port NNNN

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

To connect a remote debugger to the running qemu VM:
	gdb ./kernel
	target remote localhost:1234