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Making a PNP BIOS Call

gnewman
gnewman asked
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Last Modified: 2013-12-03
I'd like to make a call to the Plug-N-Play BIOS in Win95 and am not clear on a few things.

1. The PNP docs say you are supposed to make a FAR call to the entry point specified in the $PNP block, and that you should find the block by probing memory.  Is it true that you access the PNP BIOS with a call, rather than a software interrupt?

2. Is there an OS call you can make to get this entry point instead of probing for the $PNP block?  Perhaps by calling the Win95 Configuration Manager?

3. The PNP spec talks about making 32-bit protected calls to the PNP BIOS, but isn't clear on whether that's possible from Win95.  Is it possible to make a FAR call to a low memory address from a Win32 app?
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Commented:
Adjusted points to 200
1.
it's possible to do it only in dos environment(far calls)
(no virtual memoryzing)
so you just farcall to that address.(it's in C000 segm of bios)
and there are no standards of using INT's for PnP.
2.
 in win's there should be but only internal for detection of PnP
 so there is only possible to make virtual calls to device drivers of PnP devices.
3.nope. (in win32 you just make:
                 call i/o_device_handler
           and win will know what to do)
  in win you don't have physical acces to mem(imagine rewriting
      win kernel patch (how speedy it'll be:) )


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