[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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