Which of the subsequent instructions should be privileged, Operating System

Q. Which of the subsequent instructions should be privileged?

a) Read the clock

b) Clear memory

c) Set value of timer

d) Issue a trap instruction

e) Turn off interrupts

f) Modify entries in device-status table

g) Switch from user to kernel mode

h) Access I/O device

Answer: The following operations require to be privileged: clear memory, Set value of timer, turn off interrupts and modify entries in device-status table and access I/O device. The rest are able to be performed in user mode.

Posted Date: 7/27/2013 2:08:07 AM | Location : United States







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