Xen is passed the dom0 kernel and initrd via a reference in the /chosen
node of the device tree.

Each node has the form /chosen/modules/module@<N> and contains the following
properties:

- compatible

	Must be:

		"xen,<type>", "xen,multiboot-module"

	where <type> must be one of:

	- "linux-zimage" -- the dom0 kernel
	- "linux-initrd" -- the dom0 ramdisk

- reg

	Specifies the physical address of the module in RAM and the
	length of the module.

- bootargs (optional)

	Command line associated with this module