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March 2007 - Posts

Filtering HID collections and setting I/O flags

Over the past 3 years or so, I have been casually referring to KMDF as the ultimate driver compat layer. Just like Windows has an application compatibility layer which shields applications from OS changes, KMDF provides the same type of compatibility Read More...
Posted Monday, March 26, 2007 5:19 PM by doronh | 4 Comments
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Changes to !poreqlist

I posted about !poaction and !poreqlist about a year ago. I tend to use these extensions whenever I am debugging a power related issue in the framework. A few months ago, I ran !poreqlist and got the following output 0: kd> !poreqlist All active Power Read More...
Posted Friday, March 23, 2007 11:47 AM by doronh | 0 Comments
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More Vista remove lock (remlock) changes

First, a correction to my previous remlock post , where I said that you must still compile your driver as chk before you can see the benefits of the driver verifier's new remlock checking functionality. You don't need a chk version of your driver! The Read More...
Posted Thursday, March 22, 2007 10:40 AM by doronh | 0 Comments
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Supporting query interface in KMDF

In my last post I talked about bidirectional interfaces which can have both input and output parameters. KMDF supports both unidirectional and bidirectional interfaces. As is the case with many KMDF APIs and behaviors, we allow you to implement the easy Read More...
Posted Monday, March 12, 2007 11:25 AM by doronh | 0 Comments
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INTERFACEs can contain both input and output parameters…and not just function pointers

When you look at the documentation for an INTERFACE and IRP_MN_QUERY_INTERFACE , it mentions that the INTERFACE structure is the input provided to the interface provider (set the by the driver querying for the interface) and the remainder of the interface Read More...
Posted Tuesday, March 06, 2007 10:01 PM by doronh | 5 Comments
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Power relationships in a bus driver

A small but important rule in WDM is that while a PDO is in D0, the parent must be in D0 as well. A very simple statement that can cause a lot of trouble ;). What I have seen is that very few WDM drivers enforce this rule (while KMDF does implement this Read More...
Posted Friday, March 02, 2007 5:28 PM by doronh | 1 Comments
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