Q: Finding IDT of another task in Windows 
Author Message
 Q: Finding IDT of another task in Windows

I recently wrote a protected mode memory viewer that uses the DPMI
provided by Windows in a DOS window (yes, I'm still a DOS programmer.
=)      ).  I noticed that, when I had the viewer going in multiple DOS
windows, each reported a different location of the Interrupt Descriptor
Table.  I looked in the Intel literature at the format of the TSS but
saw no blank for the IDT's address.

Where does Windows store the contents of the IDTR of each task?
Specifically, I'd like to find the "master" IDT -- presumably the one
that Windows uses.  If there is one, does it receive IRQs first?  I'd
assume it does because, for instance, many protected mode DOS games (ex.
DOOM) obviously don't chain the previous IRQ1 handler, yet Alt+TAB and
the Windows keys still work.

Thanks in advance for any help you can offer!
-- Derek

Sat, 07 Jul 2001 03:00:00 GMT  
 [ 1 post ] 

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