Re: [Qemu-devel] qemu and OS/2

[Fabrice Bellard]

Greg Alexander wrote:
> Fabrice Bellard wrote:
>
> > Hi,
> >
> > Can you try the CVS ? I made a specific VGA fix for the OS/2 install 
> > (you can see the OS/2 & IBM logo), but there are still problems after.
> >
> > If OS/2 does not rely on segment limit checks or weird FPU exceptions, 
> > then there is a chance that QEMU can launch it soon.
>
>
> If I remember correctly, at least the early versions of OS/2 DID rely on 
> segment limit checks.  This allowed it to do multitaking on 286 
> processors, and a lot of that mechanism was still used in the 386 code.

It is possible and easy to add full segment limit and right checks in 
QEMU with a runtime selectable option. It would impact mostly 16 bit 
code and the slowdown would be small: because QEMU is a dynamic 
translator, some tests can be done at translation time.

Unfortunately it is not yet on the top on my TODO list :-(

Fabrice.