From mboxrd@z Thu Jan 1 00:00:00 1970 From: gprabhunath@gmail.com (Prabhu nath) Date: Mon, 25 Apr 2011 14:25:10 +0530 Subject: VMA of processes and CPU registers In-Reply-To: <201104202133.39612.mindentropy@gmail.com> References: <201104202133.39612.mindentropy@gmail.com> Message-ID: To: kernelnewbies@lists.kernelnewbies.org List-Id: kernelnewbies.lists.kernelnewbies.org I understand about Linear virtual address and Physical address. How is the logical address generated ? Can you please explain. Thanks, Prabhu On Wed, Apr 20, 2011 at 9:33 PM, mindentropy wrote: > On Wednesday 20 Apr 2011 4:31:08 pm limp wrote: > > Thanks a lot Dace and Vladimir for your replies. > > > > First of all, I forgot to mention that I am talking for x86 architecture. > > > > > The CPU registers will contain the virtual addresses. Each and every > > > time that the CPU tries to access a virtual memory location, then the > > > address will be translated by the MMU into a physical address. > > > > So, AFAIU the translation to physical memory takes place *only* when the > > ALU of the processor has to do some operation which has memory operands > > (in this case the CPU needs to deal with the *real* addresses) but not > > prior to that. > > > > The address translation happens in the following way: > > Logical Addr-->|Segmentation Unit|-->Linear Addr -->|Paging unit|--> > Physical > Addr. > > If the paging unit is not setup then the linear addr is the physical addr. > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies at kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20110425/f2f04843/attachment.html