Re: [Xen-devel] real-mode switch

[Keir Fraser <keir@xxxxxxxxxxxxx>]

Because it's just not supported. You can't load real-mode segment values
unless you are actually *in* real mode. Or vm86 mode.

 -- Keir

On 6/6/07 14:45, "Jayant Mangalampalli" <Jayant_Mangalampalli@xxxxxxxxxxx>
wrote:

> I tried doing this in xen domain itself, but I see the system reboots on
> itself as soon as data segment registers are loaded with "real mode
> compatible" values. Any idea why this might be happening? I am unable to
> retrieve the logs ...
> 
> Thanks
> Jayant
> 
> -----Original Message-----
> From: Keir Fraser [mailto:keir@xxxxxxxxxxxxx]
> Sent: Wednesday, June 06, 2007 4:17 PM
> To: Jayant Mangalampalli; Jan Beulich
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] real-mode switch
> 
> 
> 
> 
> On 6/6/07 11:32, "Jayant Mangalampalli"
> <Jayant_Mangalampalli@xxxxxxxxxxx>
> wrote:
> 
>> The problem traces back to setting appropriate vesa mode after xen
>> initialization is done. For that we need an ability to get into real
>> mode briefly and we can set the mode back to 'protected' after the
> vesa
>> driver setting is done.
> 
> This is in progress. We'll set the vesa mode on entry to Xen however;
> not
> after Xen has booted.
> 
>  -- Keir
> 
> 
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> Xen-devel@xxxxxxxxxxxxxxxxxxx
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