cornell education

Question

Which of the following should NOT be allowed in user mode? (more than one may be correct)

a) Disable all interrupts.
b) Read the time-of-day clock
c) Set the time-of-day clock
d) Perform a trap
e) TSL (test-and-set instruction used for synchronization)

Comments

https://cs.nyu.edu/courses/spring00/G22.2250-001/homeworks/solutions/hw1.html

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ok mam ,and what about option d and e ?