Physical->Virtual Memory Mapping

NTDEV
1

Hi,
I need to map a 64K block of physical memory (corresponding to BIOS region)
into virtual memory and look-up certain structures in it. Can anyone suggest
me a method to map the physical into virtual memory in NT driver?

Thank you,
Regards,
Ajith

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2

U can open \Device\PhysicalMemory and map a section of it in ur address
space
Hope it helps

pash

----- Original Message -----
From: “Ajith JayaMohan”
To: “NT Developers Interest List”
Sent: Friday, July 14, 2000 5:43 AM
Subject: [ntdev] Physical->Virtual Memory Mapping

> Hi,
> I need to map a 64K block of physical memory (corresponding to BIOS
region)
> into virtual memory and look-up certain structures in it. Can anyone
suggest
> me a method to map the physical into virtual memory in NT driver?
>
> Thank you,
> Regards,
> Ajith
> ________________________________________________________________________
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3

> I need to map a 64K block of physical memory (corresponding

to BIOS region)
into virtual memory and look-up certain structures in it. Can
anyone suggest
me a method to map the physical into virtual memory in NT driver?

Try “MmMapIoSpace()”.

PVOID
MmMapIoSpace(
IN PHYSICAL_ADDRESS PhysicalAddress,
IN ULONG NumberOfBytes,
IN MEMORY_CACHING_TYPE CacheEnable
);

MmMapIoSpace maps the given physical address range to nonpaged system space.

Patrick Klos
Network Software Engineer
NuMega Lab / Compuware Corporation

4

> me a method to map the physical into virtual memory in NT driver?

HalTranslateBusAddress + MmMapIoSpace

Max

5

Hi,
I tried both the approaches - using ZwMapViewofSection and MmMapIoSpace() -
both work fine.

Thank you,
ajith

Try “MmMapIoSpace()”.

PVOID
MmMapIoSpace(
IN PHYSICAL_ADDRESS PhysicalAddress,
IN ULONG NumberOfBytes,
IN MEMORY_CACHING_TYPE CacheEnable
);

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