RE: Walking all the physical memory in an x86 system

[Hanson, Jonathan M]

-----Original Message-----
From: linux-kernel-owner@xxxxxxxxxxxxxxx
[mailto:linux-kernel-owner@xxxxxxxxxxxxxxx] On Behalf Of Jan Engelhardt
Sent: Tuesday, November 30, 2004 9:10 AM
To: Hanson, Jonathan M
Cc: linux-kernel@xxxxxxxxxxxxxxx
Subject: RE: Walking all the physical memory in an x86 system

>>dd_rescue /dev/mem copyofmem
>
>I'm not sure what dd_rescue is as I've never heard of
>it. However, I don't think such an operation can be done from userspace
>because I need the physical addresses of memory not the virtual ones.

/dev/mem *is* physical.

[Jon M. Hanson] I can read /dev/mem from a userspace application as root
with no problems and print out what it sees. However, things are not so
simple from a kernel module as I just can't call open() and read() on
/dev/mem because no such functions are exported from the kernel. Is
there a way to read the contents of /dev/mem from a kernel module?


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