linux-kernel - read physical address space

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Message-ID: <CAHBu3sgHE-nR9PuEEMg_pLKovGfXFvu9CRDNtKx0kOApr+FfNw@mail.gmail.com>
Date:	Tue, 17 Nov 2015 15:21:35 +0000
From:	alan hopes <hopes.alan@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: read physical address space

Hi,

I am new to kernel and working on a college project.

I have kernel module which takes process ID. Based on the PID, I walk
its page tables and get to PTE for a particular VMA area.

I convert PTE to physical address (phy_addr) and now I want to read
from the that physical address.

I have made sure the page containing the physical address is mapped
but if I do printk (*phys_addr) , then kernel crashes.

I think I am missing some important concept here. Do I need another
driver to access physical space, may be a PCI driver as RAM being a
PCI device ?

Thanks
Alan
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