KernelTrap has an good article explaining the details of HIGHMEM - http://kerneltrap.org/node/2450
Parag
> Hello Everyone ,
> All books that I have read say that the concept of ZONE_HIGHMEM is
> introduced because some architectures cannot directly map memory
> beyond 896MB (x86).
>
> My question is What is direct mapping(does it mean, same virtual
> address and physical address) and why cant a architecture directly map
> a particular region in the memory?
>
>
>
> --
> Thanks and Regards
> Vivek Kutal
> http://vivekkutal.blogspot.com
>
> "Live as if you were to die tomorrow. Learn as if you were
> to live forever."
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