identity mapped paging

Hi Vaibhav,

identity mappings no longer useful.According to this article
http://geezer.osdevbrasil.net/osd/mem/index.htm#identity?- "The page table
entries used to identity-map kernel memory can be deleted once paging and
virtual addresses are enabled." Can somebody please explain?

I don't have a good idea on this. But my guess is, these entries has
to there to enable MMU. Because after enabling it you are still in the
same address space. Basically kernel needs an x to x
translation(identity mapping) before kernel do the jump to the virtual
space (0xc000 0000), after that  those entries are not needed any
more.

Will wait for our kernel experts comments.

Thanks
Vaibhav Jain

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Subin Gangadharan

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