A Hole In My Head

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...

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...

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...

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...

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...

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...