(free)dos under xen

(free)dos under xen

[James Harper]

I may have already asked this a while ago... would it be possible for
dos (free or ms) to run under xen, or does it have to be 'protected'
mode operating system?

And if dos worked, what are the chances of getting some of the 386
extender (dos4gw if I remember correctly) style games working? Or is
that precisely the thing that would need to be recompiled to work under
xen?

If only real mode dos could work, how easy would it be to modify the xen
scheduler to simulate a much slower machine?

Thanks

James


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Re: (free)dos under xen

[Jacob Gorm Hansen]

James Harper wrote:
> I may have already asked this a while ago... would it be possible for
> dos (free or ms) to run under xen, or does it have to be 'protected'
> mode operating system?
> 
> And if dos worked, what are the chances of getting some of the 386
> extender (dos4gw if I remember correctly) style games working? Or is
> that precisely the thing that would need to be recompiled to work under
> xen?
> 
> If only real mode dos could work, how easy would it be to modify the xen
> scheduler to simulate a much slower machine?
> 

hi,

if what you want is a slower machine, why not just use Bochs?

Jacob


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Re: (free)dos under xen

[Mark Williamson]

> if what you want is a slower machine, why not just use Bochs?

Or QEmu (which is very nice).

Cheers,
Mark


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xend and printf in libxc

[Grzegorz Milos]

Hi there!

I seem to have this problem of all the output (both stdout and stderr) of C 
part of xend (libxc) does not appear in the xend log (or on the console). Do 
you know what is the reason and how to change it?
Cheers
Gregor

-- 
Quidquid latine dictum sit, altum viditur --- Anon


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Re: (free)dos under xen

[Grzegorz Milos]

ok - it seems to be in the debug log. Ignore the previous email.
G
-- 
Quidquid latine dictum sit, altum viditur --- Anon


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Re: (free)dos under xen

[Travis Newman]

Just use dosbox. Very capable. I played Quake under it just to test it 
out (spent most of my time there playing Crystal Caves) or if you're 
looking for more than games, dosemu.

James Harper wrote:

>I may have already asked this a while ago... would it be possible for
>dos (free or ms) to run under xen, or does it have to be 'protected'
>mode operating system?
>
>And if dos worked, what are the chances of getting some of the 386
>extender (dos4gw if I remember correctly) style games working? Or is
>that precisely the thing that would need to be recompiled to work under
>xen?
>
>If only real mode dos could work, how easy would it be to modify the xen
>scheduler to simulate a much slower machine?
>
>Thanks
>
>James
>
>
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>SF email is sponsored by - The IT Product Guide
>Read honest & candid reviews on hundreds of IT Products from real users.
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>_______________________________________________
>Xen-devel mailing list
>Xen-devel@lists.sourceforge.net
>https://lists.sourceforge.net/lists/listinfo/xen-devel
>
>  
>



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RE: (free)dos under xen

[James Harper]

> 
> > if what you want is a slower machine, why not just use Bochs?
> 
> Or QEmu (which is very nice).
> 

A slower machine is just one possible feature. Doing it using a CPU
emulator would be a gross waste of CPU cycles imho.

One of the reasons for wanting a DOS domain (no need for artificial
slowness here) is for keeping a few legacy applications going without
having to keep them on their aging hardware, or wasting new hardware on
them.

All things considered, dosemu might be a better option.

thanks

James


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RE: (free)dos under xen

[Ian Pratt]

> I may have already asked this a while ago... would it be possible for
> dos (free or ms) to run under xen, or does it have to be 'protected'
> mode operating system?
> 
> And if dos worked, what are the chances of getting some of the 386
> extender (dos4gw if I remember correctly) style games working? Or is
> that precisely the thing that would need to be recompiled to 
> work under
> xen?
> 
> If only real mode dos could work, how easy would it be to 
> modify the xen
> scheduler to simulate a much slower machine?

Now that Xen supports vm86 mode, it probably wouldn't be a huge amount
of work to get dos or other 16 bit apps working. You'd have to think
through what to do about IO, though. Possibly hook into the emulation
stuff that's used for VMX guests.
Feel free :-)

Cheers,
Ian


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Re: (free)dos under xen

[Stephan Diestelhorst]

> > I may have already asked this a while ago... would it be possible for
> > dos (free or ms) to run under xen, or does it have to be 'protected'
> > mode operating system?
> >
> > And if dos worked, what are the chances of getting some of the 386
> > extender (dos4gw if I remember correctly) style games working? Or is
> > that precisely the thing that would need to be recompiled to
> > work under
> > xen?
> >
> > If only real mode dos could work, how easy would it be to
> > modify the xen
> > scheduler to simulate a much slower machine?
>
> Now that Xen supports vm86 mode, it probably wouldn't be a huge amount
> of work to get dos or other 16 bit apps working. You'd have to think
> through what to do about IO, though. Possibly hook into the emulation
> stuff that's used for VMX guests.
> Feel free :-)

As Ian suggests, it should work with vm86 enabled. You may wish to start with 
dosbox under linux in dom0, this ought to work. And it doesn't eat up cpu 
cycles like candy :)If you want to run a single DOS on Xen, you will 
definitely have to introduce some "abstraction" layer, similar to the one 
dosbox provides. dos4gw is an interesting beast, it tries different 
interfaces to switch itself into protected mode (DPMI is the one i recall). 
That might result in some neat lowlevel hacking ;) Again, dosbox is said to 
support dos4gw games to some extent, so have a look there!

Cheers,
  Stephan


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