Enable FreeBSD/Xen Dom0 Support to FreeBSD EFI Loader [Week 3]

[Kristaps Čivkulis]

Hi,

Last week I
1) Loaded Xen kernel into memory and jumped (probably incorrectly) to
specified entry point to execute it. Unfortunately QEMU crashes after
few seconds after jumping to the entry point. I have to figure out
where could be a problem.
2) Read multiboot2 implementation of grub2
3) Improved code style
4) Tried to better understand ELF format (Xen kernel doesn't have all
the needed information in multiboot2 tags, so I have to read ELF
header)

I print RAM state just before jumping to entry point, and it seems
that I load Xen kernel correctly. I think the problem is in page
tables and register state after jumping to entry point.