Xen - Source?

[Andreas <andreas2@logic.univie.ac.at>]

Hallo everybody!

Xen is distributed with Debian (main)

Seems the source-package doesn't contain the code of the hypervisor.
Also /lib/modules/2.6....-686/kernel/arch/xen/i386/mm/hypervisor.c is not
included.

Installing it (make), it downloads the binary of the hypervisor!
"Cloning http://xenbits.xensource.com/linux-2.6.18-xen.hg "     # (downloading)

So where do I find the source of the xen-Hypervisor (running below the
linux-kernel)? - Or: why could it be distributed with Debian?

thanks a lot,
Andrew