Messages in this thread | | | Date | Tue, 17 Nov 2015 15:21:35 +0000 | Subject | read physical address space | From | alan hopes <> |
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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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