Messages in this thread | | | Date | Tue, 30 Nov 2004 16:26:52 -0500 (EST) | From | linux-os <> | Subject | RE: Walking all the physical memory in an x86 system |
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On Tue, 30 Nov 2004, Hanson, Jonathan M wrote:
> > > -----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? >
You just read it directly (hint ioremap) ......
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