Re: Dos App hangs with DPMI / PIC problem

anon permutation
2004-09-09T02:42:38Z

I have attached dosdebug to dosemu when it hangs, and I got the following:

System state: running in real mode while in DPMI
AX=0000 BX=800a CX=0000 DX=0003
SI=874c DI=023a SP=056c BP=c316
DS=c316 FS=0000 GS=0000 FL=3286
CS:IP=0522:0434
SS:SP=c316:05bc

0522:0434 53 push bx

What should I do? Thanks.

>From: Ryan Underwood <nemesis-lists@icequake.net>
>To: anon permutation <anonpermutation@hotmail.com>
>CC: linux-msdos@vger.kernel.org
>Subject: Re: Dos App hangs with DPMI / PIC problem
>Date: Wed, 8 Sep 2004 15:49:15 -0500
>
>
>On Wed, Sep 08, 2004 at 09:54:49AM +0000, anon permutation wrote:
> >
> >
> > I am wondering, since this hanging problem is related to dosemu's dpmi
> > implementation, is it possible for me to use another dpmi
>implementation?
> > Can I turn off dosemu's dpmi inside dosemu.conf and then run some other
> > dpmi inside autoexec.bat?
> >
> > Is this feasible? What other DPMI implementation is compatible with
>dosemu?
>
>No, that is not possible. DPMI server runs in protected mode, so it has
>to be part of dosemu and a server cannot be installed from the v86 task.
>It is the same reason why you can't use another 386 EMS manager under
>dosemu, because the EMS manager runs in protected mode in order to use
>the 386 paging unit.
>
>Also, usually DPMI servers that are not integrated into the EMS manager
>will use VCPI to enter protected mode, since the EMS manager is already
>running in protected mode and provides a VCPI interface in case another
>program wants protected mode. Using VCPI is unfortunately also
>impossible under dosemu, not a fault of dosemu but the fault/intent of
>VCPI design.
>
>--
>Ryan Underwood, <nemesis@icequake.net>
>-
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