From: Eric Lange <nospam AT thisaddress DOT please>
Newsgroups: comp.os.msdos.djgpp,comp.lang.asm.x86
Subject: Re: Getting the V86 mode TSS
Date: Thu, 10 Jul 1997 12:09:13 -0700
Organization: E-mu Systems, Inc.
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Message-ID: <33C53359.193@thisaddress.please>
References: <33C26CF7 DOT 5B7 AT emu DOT com> <5q0rqu$ns3$1 AT hermes DOT louisville DOT edu>
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Thanks for the reply.  Is this the only way?  I was hoping to avoid
server-specific mechanisms, as I would like this to work with all VCPI
servers.  The only thing I can figure to do is to create my own V86
session and hook all VCPI functions.  Ugh.

Does EMS provide any way of getting at this info?  I know the TSS is
sitting somewhere below 1MB, but where?!!  Aaaarrrrggghhhh!

Eric

George C. Lindauer wrote:
> 
> Eric Lange (ericl AT emu DOT com) wrote:
> 
> There is a back door to EMM386 that allows you to hook input/output to
> ports.  The callback runs in 286 PMODE. if you are lucky enough to be
> in a ring 0 code seg (I don't know if that is the case) you might be
> able to just trigger one of these callbacks and use STR directly.
> 
> David
> : I have a situation in which I would like to know the linear address of
> : my DOS V86 session's TSS.  Is there a VCPI compliant way that I can find
> : this out?
> :
> : I figure that if I can switch into protected mode, I can simply do:
> :
> :       sgdt    [gdt_buffer]
> :       str     [task_register]
> :
> : and the value of task_register will index into gdt_buffer, which will
> : give me the information that I need.
> :
> : However, when a VCPI server is loaded (which is why I'm in V86 mode to
> : begin with), I have to use the VCPI interface to switch to PM.  But, it
> : wants me to assign a _new_ GDT and _new_ TR, basically disallowing me
> : from getting the information I want.
> :
> : Is there a way around this?  Basically, I want to load a TSR that has
> : access to the TSS of running real mode DOS programs.
> :
> : Any help would be ... well ... helpful.
> :
> : Thanks,
> : Eric Lange

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