Re: why choose 896MB to the start point of ZONE_HIGHMEM

From: H. Peter Anvin
Date: Wed Apr 07 2010 - 02:14:34 EST

On 04/06/2010 10:57 PM, Venkatram Tummala wrote:
> Just a note Chetan.
> We can't exactly say that we require "page table settings" to map that
> 896 MB of physical ram. It is an identity mapped segment (1-1 mapping).
> So, we dont require the "page tables". Virtual address will be equal to
> Physical Address + Page Offset. It is just an addition of offset

No, we still need page tables for the identity-mapped segment.


H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.

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