MmMapLockedPagesSpecifyCache in XP and Server2003

[ysht]

Hi,
I'm Yot and I'm writing a driver.

Here is my driver code:
===
DeviceExtension->SystemVirtualAddress = ExAllocatePool( NonPagedPool , Size6M );
DeviceExtension->Mdl = IoAllocateMdl( DeviceExtension->SystemVirtualAddress,
Size6M, FALSE, FALSE, NULL );
DeviceExtension->UserVirtualAddress = MmMapLockedPagesSpecifyCache(
DeviceExtension->Mdl,
UserMode, MmNonCached, NULL,
FALSE, NormalPagePriority);
---
After MmMapLockedPagesSpecifyCache returns the address of the mapped pages,
my application code accesses the address with it.
===

This code and my application code works well in WindowsXP
Professional Version 2002 SP3.
But in Windows Server 2003 R2 Standard Edition SP3,
MmMapLockedPagesSpecifyCache returns non-NULL value but my application code
can't access the address with it.

Therefore I use WindowsXP,but want to actually Windows Server 2003 now.

Can anyone provide suggestions ?
Any help or guidance would be appreciated.

Thanks!

[David Craig]

This newsgroup is for Win32 where it intersects the kernel. This is not a
device driver forum except for those few in the win32 arena. Sharing kernel
memory with a user mode program is a very difficult task to master and
usually leads to security holes unless the driver writer is very experienced
(10 years or more in kernel mode).

"ysht" <ysh...@gmail.com> wrote in message
news:urf62IAH...@TK2MSFTNGP06.phx.gbl...

[ysht]

David,thank you very much.

I'm sorry that I took wrong what I contributed to here because
I had had all of you help here before.

Yot.