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March 2008 - Posts

Using KeAcquireSpinLockAtDpcLevel is only a perf gain if you know you are DISPATCH_LEVEL

Well, that is certainly a long title ;). First, let us look at an approximate implementation of KeAcquireSpinLock and KeRaiseIrql (and yes I know that KeRaiseIrql is really a #define to KfRaiseIrql, but it is the same thing that happens in the end…) KIRQL Read More...
Posted Friday, March 28, 2008 3:42 PM by doronh | 0 Comments
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Inconceivableable

I have no idea who created the name for PNP_DEVICE_NOT_DISABLEABLE, but I probably have the same reaction as you ... "seriously? that is what they named?" I mean come on, I think it could have at least been named PNP_DEVICE_CANNOT_BE_DISABLED. I am sure Read More...
Posted Tuesday, March 18, 2008 4:55 PM by doronh | 0 Comments
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Once not disableable, forever not disableable

One interesting quirk about the PNP_DEVICE_NOT_DISABLEABLE state is that once it has been set and the PnP manager has processed it, the state is sticky.  By sticky I mean that even if you attempt to clear this bit on a subsequent IRP_MN_QUERY_PNP_DEVICE_STATE Read More...
Posted Tuesday, March 18, 2008 8:21 AM by doronh | 0 Comments
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Returning failure from DriverEntry

One thing that is easily overlooked about implementing DriverEntry is that upon return !NT_SUCCESS, DriverUnload is not called. I mentioned this anecdotally in a previous post , but it is worth expanding on. I was bit by this oversight when I was working Read More...
Posted Monday, March 17, 2008 4:56 PM by doronh | 0 Comments
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one of the books that started it all...

During my sophomore year at Cal Poly , I decided that I wanted to learn about threads, synchronization techniques and other topics associated modern operating systems. Windows 95 had made its debut (yes, it is not a modern OS, but I didn't know that at Read More...
Posted Wednesday, March 12, 2008 8:38 AM by doronh | 0 Comments
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Getting 64 bit Vista to open my Inbox the way I want it to

A bit over a year ago I had to figure out why my Mail key started behaving differently on Vista vs XP and wrote about how I fixed it.  Well, my dev box was so slow that I was able to employ enough sympathy that I got a new one.  While my old Read More...
Posted Tuesday, March 11, 2008 4:00 PM by doronh | 1 Comments
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