Messages in this thread | | | Subject | RE: Walking all the physical memory in an x86 system | Date | Tue, 30 Nov 2004 14:16:22 -0700 | From | "Hanson, Jonathan M" <> |
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-----Original Message----- From: linux-kernel-owner@vger.kernel.org [mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of Jan Engelhardt Sent: Tuesday, November 30, 2004 9:10 AM To: Hanson, Jonathan M Cc: linux-kernel@vger.kernel.org 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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