Hi,
I’m using MmProbeAndLockPages on an Mdl built for a user mode buffer.
And after examining the DDK-DOCU again I found the following in the
MmProbeAndLockPages documentation:
Callers of MmProbeAndLockPages must be running at IRQL < DISPATCH_LEVEL for
pageable addresses, or at IRQL <= DISPATCH_LEVEL for nonpageable addresses.
As my address is from a user mode application, it is pageable, so I must
not call this MmProbeAndLockPages(…), but where should I call it then?
Do I need to call it in a worker-thread/ workitem and wait for it to be
completed?
Best Regards
Michael
Well that won’t help, as you can’t wait at DISPATCH_LEVEL. You need to call
MmProbeAndLockPages when you first encounter the IRP, in your DispatchIoctl
routine, when you should be at PASSIVE_LEVEL. Also, your earlier code
sniglet appeared to be calling both MmProbeAndLockPages and
MmMapLockedPages, why is that? MmProbeAndLockPages ought to be sufficient by
itself.
-----Original Message-----
From: xxxxx@sonydadc.com [mailto:xxxxx@sonydadc.com]
Sent: Friday, May 02, 2003 10:56 AM
To: NT Developers Interest List
Subject: [ntdev] MmProbeAndLockPages - Proble.
Hi,
I’m using MmProbeAndLockPages on an Mdl built for a user mode
buffer. And after examining the DDK-DOCU again I found the
following in the MmProbeAndLockPages documentation:
> Callers of MmProbeAndLockPages must be running at IRQL <
> DISPATCH_LEVEL for pageable addresses, or at IRQL <=
> DISPATCH_LEVEL for nonpageable addresses.
As my address is from a user mode application, it is
pageable, so I must not call this MmProbeAndLockPages(…),
but where should I call it then? Do I need to call it in a
worker-thread/ workitem and wait for it to be completed?
Best Regards
Michael
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