peek()ing a location

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1 total messages Started by Alex S. Waterman Wed, 11 Nov 1992 07:19

#1459

Author: Alex S. Waterman
Date: Wed, 11 Nov 1992 07:19

19 lines
1378 bytes

All,
	I have implemented a device driver in SunOS 4.1.1 that communicates
with a 68040 on the VME backplane.  In some circumstances I would like to
use a _guarded_ access mechanism to check the memory directly on the board. 
Guarded in the sense that if I reference it it won't dump the kernel.  The
68040 is occasionally locking the VME bus and I would like to sense this
without the kernel dumping.
(the memory has been mapped in, etc.  I can access it most of the time.)

	The peek() routine is perfect for this but the Sun manual says to only
use it in the probe() routine.  I would like to use it in my strategy() 
routine.  Is there any known reason why I can't?  No reason is given.
	If I can't use peek(), is there another way to accomplish this?  


	Thanks for your help.

 - Alex Waterman
   Alex@virginia.edu

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