From mboxrd@z Thu Jan 1 00:00:00 1970 From: subingangadharan@gmail.com (subin gangadharan) Date: Tue, 19 Jun 2012 02:23:28 -0700 Subject: identity mapped paging In-Reply-To: References: Message-ID: To: kernelnewbies@lists.kernelnewbies.org List-Id: kernelnewbies.lists.kernelnewbies.org 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 > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies at kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > -- With Regards Subin Gangadharan I am not afraid and I am also not afraid of being afraid.