Re: [ToDo] Real Mode Support

[Guillaume Thouvenin <guillaume.thouvenin-Z51IpKcfGtLk1uMJSBkQmQ@public.gmane.org>]

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?
 
Regards,
Guillaume

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