Re: [ToDo] Real Mode Support

[Izik Eidus <izike-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

On Wed, 2008-02-06 at 13:07 +0100, Guillaume Thouvenin wrote:
> On Wed, 06 Feb 2008 10:52:54 +0200
> Izik Eidus <izike-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote:
> > 
> > i am not expert for the emulator area, but as far as i remember:
> > 
> > virtual 8086 have some checks related to segments (the big mode
> > problem), it mean that for some addresses it wont be able to execute
> > anything, you will just get vmexit right away, therefor you need a full
> > functional emulator that will handle everything there.
> 
> Oh thanks,  I remember now. The problem seems to be with the descriptor
> cache register. In protected mode and also in virtual mode the
> descriptor cache register is fully loaded each time a segment register
> is loaded. It's not the case in real mode. So every program that uses
> this "feature" (the big real mode) will not work under vm8086.
> Thus we need to remove the usage of the virtual mode and instead we
> need to fully emulate the real mode in order to be "big real mode"
> compliant.
> 
> Does somebody know if there are already some patches or some other stuff
> about big real mode support?

i think that there used to be talks about this before long time ago,
i dont know what the state is (i hard to belive anyone is working on it
right now), but to be sure we will have to wait to avi.

>  
> Regards,
> Guillaume


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