On Monday 25 Apr 2011 2:25:10 pm Prabhu nath wrote:
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 <mindentropy@gmail.com> 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.
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In the segmented memory model the memory appears as segments. In this model the program issues a logical address which comprises of a segment:offset address. The offset selects a byte in the segment. The segmentation unit converts it to a linear address. If the paging unit is enabled the linear address passes through the paging unit for further translation. Also please do not top post :)