ZONE_HIGHMEM query

[Vivek Kutal]

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."
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/