Is IDT is different for different process?

marathi...@gmail.com

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Feb 2, 2021, 12:27:22 AM2/2/21

to noc21-cs4...@nptel.iitm.ac.in

Hi,

I have a question about what is happening in this video at 00:25:19 -

http://www.youtube.com/watch?v=xbEksyB1kBc#t=1519s.

if it is different for different process then can 2 process have different IST for a unique interrupt right? which may cause problems. If it is unique for all process then why do we need IDTR when can use specific memory area to store IDT like in case of arm all ISR addresses are stored at starting location.

Thanks!

Reference Key - Key('StudentQuestionEntity', 5545663197609984, namespace='ns_noc21_cs44')

Parth Dhar

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Mar 24, 2021, 8:02:43 PM3/24/21

to Discussion forum for Operating System, marathi...@gmail.com

Yes, else IDTs would also be switched on a context-switch.

Having the IDT reside anywhere in memory and not at a hardcoded address is an x86 design choice. It allows for more flexibility.

Gireesh Marathi

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Mar 24, 2021, 10:04:41 PM3/24/21

to Parth Dhar, Discussion forum for Operating System

Ok, thanks for the clarification.

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