Re: [ros-dev] csrss.exe and VDM ?

[Robert Köpferl]

What-o-ever.
In some way I like the cluttered way ntvdm is implemented. Looking 
forward on coming PC hardware and back to old DOSware and forward to 
processor portability, I'd vote for DOSbox* as ROS's dos-box.
CPUs get faster and faster and evolution is going away from ia32 (With 
vx86-mode). Thus a solely software implemented DOS-Box is more 
appropriate, now.
Can we fix this theme somewhere?  Steven? Jason?

*DOSbox = Freedos+bochs(win32)

Alex Ionescu wrote:
>   Filip Navara wrote:
>  
> > >   + 16-bit
> > > virtual DOS machine (VDM)
> > >     
> >
> >  CSRSS is involved here, but the main VDM process is NTVDM.exe which
> >  executes Win16/DOS programs and uses special kernel calls
> >  (NtVdmControl or how is it called). The emulated devices are
> >  handled by special device drivers (see DDK for details, there's
> >  special section about VDD drivers and DDK Graphics Drivers section
> >  has some info about VDM graphics handling)
> >
> >   
> >
> > >   Is in the csrss.exe (from ReactOS) the VDM
> > > process inluded?
> > >     
> >
> >  No.
> >
> >   
> >
> > >   I read in the old forum that someone spoke about
> > > an DOS/win16
> > >  subsystem.
> > >  Should the DOS (virtual maschine) be a part of the csrss.exe?
> > >     
> >
> >  See above.
> >
> >   
> >
> >   
> >  
>  
>  Just to add some information, CSRSS is quite more involved then Filip 
>  would make it seem :). Although NtVdmControl is used for hardware kernel 
>  calls, almost all the 1) Console and 2) VDM Emulation is passed back 
>  through CSRSS. CSRSS is the one who executes the loops to get the newest 
>  emulated commands to do, and who handles all the I/O.
>  
>  Best regards,
>  Alex Ionescu
>  
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