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Question

Which of the following should be allowed only in kernel mode?

1.Changing mapping from virtual to physical address.

2.Mask and unmask interrupts.

3.Disabling all interrupts.

4.Reading status of processor.

5.Reading time of day

(a)1,2 and 3                                                                                         (b) 1,2,4 and 5

(c) 2,3 and 5                                                                                        (d) All of the above

Answer 1

I think option A as 1,2,3 require privileged instructions thus switching to Kernel Mode.

Comments

@soumya

 

Any reference link or document to verify the answer?

 

Thanks

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@ soumya  .please provide any reference

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Please refer to second paragraph.