Re: [PATCH 2/3] x86: real mode support: get EDD info

[Keir Fraser <keir@xensource.com>]

On 2/3/07 11:26, "Jan Beulich" <jbeulich@novell.com> wrote:

> Possible, but especially on x86-64 undesirable in my opinion.

It's certainly more of a pain to make the mode switch, but not impossible by
any means.

> Also, I'll want
> the base real mode stuff in anyway (regardless of EDD/EDID) in order to
> be able to set up a VESA frame buffer mode for the console. This clearly
> should be done by Xen in order to ensure it knows how to access the
> console in case it is allowed access past dom0 creation.

Oh yes, we definitely want the mode-switching code in Xen. No doubt about
that. The question is whether we pull in the EDD/EDID stuff as well. The
fact that the data format is BIOS-defined does make the current approach
plausible if not particularly tasteful architecturally speaking (but what
BIOS stuff is? :-).

 -- Keir