Need help understanding memory models, cpu modes and address translation

[Kaustubh Ashtekar]

On Sat, Jul 16, 2011 at 8:34 AM, Vaibhav Jain <vjoss197 at gmail.com> wrote:
>
> Hi,
>
> Actually I have read that book. But when i started reading other books such as those on assembly
> they had these concpets of Real Mode , Protected Mode , Flat Memory model, Segmented Memory model which are specific to intel 32-bit architecture
> and which has got me highly confused. So I am looking for references that explain these concepts in depth.


What I suggest is. You should download a datasheet for Intel 8086,
designed by Intel in late 1970's.  Read espacially the memory
organization part. This will give you some basic understanding of read
mode and segmentation stuff and how it all started. The current
processor manuals are too complex to start with.

Link:
http://datasheets.chipdb.org/Intel/x86/808x/datashts/8086/




>
> Thanks
> Vaibhav Jain
>
>
> On Thu, Jul 14, 2011 at 9:26 PM, Kaustubh Ashtekar <ksashtekar at gmail.com> wrote:
>>
>> I think you should first read the book
>> Operating System Concepts by  Silberschatz Galvin.
>> It is a general book on OS concepts and will help you gain understanding of these concepts.
>> -Kaustubh
>> On Thu, Jul 14, 2011 at 1:17 AM, Vaibhav Jain <vjoss197 at gmail.com> wrote:
>>>
>>> Hi,
>>>
>>> Thanks a lot for the resources! I just had a cursory look at them and could see that they explain virtual memory and
>>> address translation in depth. Just wanted to ask if they explain the concepts Memory models (flat, segmented ) and cpu modes (real,protected) equally well. I am more confused about
>>> these concepts.
>>>
>>> Thanks
>>> Vaibhav Jain
>>>
>>> On Wed, Jul 13, 2011 at 10:40 AM, Anuz Pratap Singh Tomar <chambilkethakur at gmail.com> wrote:
>>>>
>>>>
>>>> On Wed, Jul 13, 2011 at 6:29 PM, Jeff Haran <jharan at bytemobile.com> wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> From: kernelnewbies-bounces at kernelnewbies.org [mailto:kernelnewbies-bounces at kernelnewbies.org] On Behalf Of Vaibhav Jain
>>>>> Sent: Wednesday, July 13, 2011 1:38 AM
>>>>> To: Daniel Baluta
>>>>> Cc: kernelnewbies at kernelnewbies.org
>>>>> Subject: Re: Need help understanding memory models,cpu modes and address translation
>>>>>
>>>>>
>>>>>
>>>>> Hi,
>>>>>
>>>>> Thanks for the link.I really appreciate but I need something more basic and something that
>>>>> explains these concepts from a broader perspective and not in the context of a
>>>>> particular cpu architecture.Please send me more such links if you come across any.
>>>>>
>>>>> Thanks
>>>>> Vaibhav Jain
>>>>>
>>>>> On Wed, Jul 13, 2011 at 1:14 AM, Daniel Baluta <daniel.baluta at gmail.com> wrote:
>>>>>
>>>>> Hi,
>>>>>
>>>>> > I am eager to understand the basics of Memory models  (flat, segmented etc)
>>>>> > , CPU modes (real,protected)
>>>>> > and address translation (physical to logical etc.) and how all of them work
>>>>> > together. I am very confused
>>>>> > about this and would really appreciate if someone could provide good
>>>>> > references to these topics.
>>>>>
>>>>> You may find useful information inside i366 Programmers Manual.
>>>>> Anyhow, reading materials is the first step in understanding these
>>>>> concepts. You will have to actually  read/write/debug pieces of code
>>>>> related to them.
>>>>>
>>>>> thanks,
>>>>> Daniel.
>>>>>
>>>>> [1] pdos.csail.mit.edu/6.828/2010/readings/i386.pdf
>>>>>
>>>>>
>>>>>
>>>>> You might want to try “Understanding the Linux Virtual Memory Manager” by Mel Gorman. It’s freely available on the web.
>>>>>
>>>>>
>>>>>
>>>>> It’s Linux specific, but since Linux needs to run on a multitude of different processors with different memory management hardware, the approach it takes to doing so in inherently broad.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>> A lot of basic concepts can be learnt from JIm Turley's book on 8086
>>>> Other book is modern operating systems by Tanenbaum which explains everything in much detail with  code snippets.
>>>>
>>>>
>>>
>>>
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>>
>