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Re: address spaces in kernel

Fawad Lateef wrote:

On 9/3/05, Rahul Iyer <idlisambar@xxxxxxxxx> wrote:


                         Paging
Segmentation
Virtual Address ------------> Linear Address -------------------------->
Physical Address




I know this, its clearly mentioned in the Intel System Programming
Manual !!! but I havn't seen any linear address related thing in
kernel .... can you point me towards it ??? b/c AFAIK kernel uses
virtual adresses not linear and I havn't found any difference b/w them
or might I still not aware of it :(



Hi Fawad,
Linux doesn't really use segmentation. But x86 *requires* you to use it. IIRC, Linux defines all segments as the 4G of memory. What i mean is that each segment maps all of the 4G. Because of this, there is a 1 to 1 correspondence between Linear and Physical addresses.
thanks
Rahul


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