how to make sure that a particular driver is loaded and device is initialized?

NTDEV
1

Hi all,

Let’s say I want to access hard drive or print anything onto display from my kernel driver? How to determine that a particular device is ready and I can work with it?
Is it enough to put my driver appropriately in the boot load groups?

Thank you,
Roman

2

Roman Kudinov wrote:

Hi all,

Let’s say I want to access hard drive or print anything onto display
from my kernel driver? How to determine that a particular device is
ready and I can work with it?
Is it enough to put my driver appropriately in the boot load groups?

Thank you,
Roman

Questions? First check the Kernel Driver FAQ at
http://www.osronline.com/article.cfm?id=256

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Put your driver in the system load group. This will save you from a lot
of trouble.
At least you can be sure that all ZwXXX functions for file handle works
fine.

I am not sure about printing.

Just remember that all file handle functions are for PASSIVE_LEVEL. So
if you use
any spin locks restore the IRQL at PASSIVE_LEVEL and then access any files.

Oh, file handles are valid only in the process that created them. So
forget about creating a file handle at driver load
and use it later on from dispatch I/O routines.

Thats all.
I hope i helped.

3

Yes, it is enough. You can also have a helper applet like a tray icon which will ping the driver with IOCTLs and show error boxes if the driver is not detected.

Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
xxxxx@storagecraft.com
http://www.storagecraft.com
----- Original Message -----
From: Roman Kudinov
Newsgroups: ntdev
To: Windows System Software Devs Interest List
Sent: Friday, August 12, 2005 8:04 PM
Subject: [ntdev] how to make sure that a particular driver is loaded and device is initialized?

Hi all,

Let’s say I want to access hard drive or print anything onto display from my kernel driver? How to determine that a particular device is ready and I can work with it?
Is it enough to put my driver appropriately in the boot load groups?

Thank you,
Roman

Questions? First check the Kernel Driver FAQ at http://www.osronline.com/article.cfm?id=256

You are currently subscribed to ntdev as: unknown lmsubst tag argument: ‘’
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