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Re: [Xen-devel] beginnings of allowing more than the basic 80x25 VGAscre

To: Gerd Knorr <kraxel@xxxxxxx>
Subject: Re: [Xen-devel] beginnings of allowing more than the basic 80x25 VGAscreen resolution
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Tue, 5 Jul 2005 14:07:16 +0100
Cc: "Ling, Xiaofeng" <xiaofeng.ling@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Jan Beulich <JBeulich@xxxxxxxxxx>
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On 5 Jul 2005, at 13:58, Gerd Knorr wrote:

IIRC there are some fields in the multiboot info header for that kind
of stuff, so grub could setup that and pass on the info to xen (and
xen in turn to the dom0 kernel?).

multiboot kernels are started in 32-bit protected mode by the boot
loader, i.e. xen has (unlike linux) no 16-bit startup code.  Thus
doing 16-bit BIOS calls once xen is running is a bit difficuilt ...

GRUB has code for switching back into real mode to do bios calls. We could take that, plus video.S, and put them in Xen. Then add an info structure for passing video info up to domain0. It's pretty ugly, but I think there is no nice solution here. Would we also need vesa/vga driver code from Linux for setting up font data in some graphics modes?

 -- Keir

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