Two corrections

[Murali Krishnan]

1.  Minor:   In the page http://exposnitc.github.io/os_spec-files/overview.html

there is no description for "user" and "login". 

2.  Important:  There is one issue when the swapper is implemented.

There are several places where the return values of system calls are

placed in the stack.  Students tend to precalculate the value of Physical

SP and store in a register and place the return value to this location.

(There could be several cases - if some error condition is there, then

-1 could be returned etc.).

Now, if a process is swapped out and then swapped back, the stack page

could be relocated to a new physical page and the PhysicalSP value will

be different. 

We need to add a note somewhere about this fact. 

The issue was reported from IITPKD.

Murali

[Nikhil Sojan]

Sir, 

We will add them right after the exams. 

Nikhil

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[Murali Krishnan]

Another issue

Modules exceeding 7 are not getting loaded using xfs interface.

Murali

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[Nikhil Sojan]

Sir,  

The access control module for stage 28 is module 8. That is getting loaded to memory. 

I haven't checked any of the test modules though. 

Nikhil

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[Murali Krishnan]

Nikhil,

   Could you please check loading of Module 9,10 and 11 (testA, testB and testC) when you get time.  It isn't urgent.

Murali

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[Nikhil Sojan]

Okay sir. 

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[Nikhil Sojan]

Sir,

The NO_OF_MODULES constant was set to 8 in expos. XFS interface checks if the module number is less than this constant or not. We have changed it to 10 now. So, modules 9 and 10 can be loaded now.

Nikhil

[Nikhil Sojan]

Sorry changed it to 11.

[Karunakaran Murali Krishnan]

Nikhil,
Just check loading some module function and then trying to call to
that module function.
so that chances of future run-time errors aren't there.
Murali

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[Nikhil Sojan]

Sir, 

I'll check it latest by monday. 

Nikhil 

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[Nikhil Sojan]

sir,

module 9,10,11 will work only in nexsm. They are stored in disk blocks 518-522.

Nikhil