VMA of processes and CPU registers

[Prabhu nath]

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 at 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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