On 11/15/06, Bithika Khargharia <bithika@xxxxxxxxx> wrote:
Hi,
1. Given the PFN, how do I obtain the base physical address for the PFN.
I use
'pfn <<12'.
Is this correct?
Yes 'pfn << PAGE_SHIFT' gives physical-base-address although its
better to use page_to_phys macro
2. Does the kernel generate PFN serailly from 0 to TOTAL_PHYS or are there
breaks in between?
Yes serially for x86 from 0UL but might contain some starting offset
according to some architectures. Take a look at page_to_phys macro
(http://lxr.free-electrons.com/source/include/asm-i386/io.h#101) and
__page_to_pfn macro
(http://lxr.free-electrons.com/source/include/asm-generic/memory_model.h#032)
--
Fawad Lateef
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