dosemu and ubuntu 14

dosemu and ubuntu 14

[Tom]

Excuse for my english

With the first installation of Ubuntu 14.04, dosemu work fine (foxpro under
dosemu work fine!)
Linux  3.13.0-27-generic #50-Ubuntu

But now, 10 june 2014, after I've update the system
Linux  3.13.0-29-generic #53-Ubuntu SMP Wed Jun 4 21:00:20 UTC
2014 x86_64 x86_64 x86_64 GNU/Linux

foxpro under dosemu don't work with this error:
"
Phar Lap err 35: The 386 chip is currently executing
in virtual 8086 mode under the control of another program.  You must turn
off this other program in order to use 386|DOS-Extender to run in
protected mode
"

What's the problem?

Thanks

Tom

Re: dosemu and ubuntu 14

[Stas Sergeev]

10.06.2014 16:24, Tom пишет:
> Excuse for my english
>
> With the first installation of Ubuntu 14.04, dosemu work fine (foxpro under
> dosemu work fine!)
> Linux  3.13.0-27-generic #50-Ubuntu
>
> But now, 10 june 2014, after I've update the system
> Linux  3.13.0-29-generic #53-Ubuntu SMP Wed Jun 4 21:00:20 UTC
> 2014 x86_64 x86_64 x86_64 GNU/Linux
>
> foxpro under dosemu don't work with this error:
> "
> Phar Lap err 35: The 386 chip is currently executing
> in virtual 8086 mode under the control of another program.  You must turn
> off this other program in order to use 386|DOS-Extender to run in
> protected mode
> "
>
> What's the problem?
3.14 linux kernel has dropped the DPMI support for x86_64.
Yours is 3.13.0-29 - my guess is that it had backported
that behaviour from 3.14.
Your previous 3.13.0-27 was likely i686 (32bit), where the
DPMI support is still possible. Or it didn't have the aforementioned
backport.

So, to run foxpro, you either need old kernel or 32bit system.
Kernel developers seem to no longer consider dosemu users
as their target audience.
3.15 kernel will probably have a work-around to that problem
because wine was also affected (wine users are regarded much
better, it seems :)
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Re: dosemu and ubuntu 14

[Andrew Bird]

Perhaps they backported this proc switch too. Perhaps it's worth checking if 
/proc/sys/abi/ldt16
exists?

From looking at the following for 3.12 perhaps they are going to cripple all 
the stable kernels for dosemu on 64 bit

http://www.spinics.net/lists/stable/msg48927.html

On Tuesday 10 June 2014 16:43:50 Stas Sergeev wrote:
> 10.06.2014 16:24, Tom пишет:
> > Excuse for my english
> > 
> > With the first installation of Ubuntu 14.04, dosemu work fine (foxpro
> > under
> > dosemu work fine!)
> > Linux  3.13.0-27-generic #50-Ubuntu
> > 
> > But now, 10 june 2014, after I've update the system
> > Linux  3.13.0-29-generic #53-Ubuntu SMP Wed Jun 4 21:00:20 UTC
> > 2014 x86_64 x86_64 x86_64 GNU/Linux
> > 
> > foxpro under dosemu don't work with this error:
> > "
> > Phar Lap err 35: The 386 chip is currently executing
> > in virtual 8086 mode under the control of another program.  You must turn
> > off this other program in order to use 386|DOS-Extender to run in
> > protected mode
> > "
> > 
> > What's the problem?
> 
> 3.14 linux kernel has dropped the DPMI support for x86_64.
> Yours is 3.13.0-29 - my guess is that it had backported
> that behaviour from 3.14.
> Your previous 3.13.0-27 was likely i686 (32bit), where the
> DPMI support is still possible. Or it didn't have the aforementioned
> backport.
> 
> So, to run foxpro, you either need old kernel or 32bit system.
> Kernel developers seem to no longer consider dosemu users
> as their target audience.
> 3.15 kernel will probably have a work-around to that problem
> because wine was also affected (wine users are regarded much
> better, it seems :)
> --
> To unsubscribe from this list: send the line "unsubscribe linux-msdos" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

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