Question
Which of the following statements are true. Select all that apply. A. MAR register needs to be saved during context switch. B. A system uses
Which of the following statements are true. Select all that apply.
A. MAR register needs to be saved during context switch.
B. A system uses a timer register to store the current real-world time in the precision of a second. It is updated by the physical clock when the
time advances a second. This timer register needs to be saved during a context switch.
C. The user code of a root user can run in kernel mode due to its root privilege.
D. A root user can rewrite the OS to allow her program to switch to kernel mode to run her own user code (not the system trap functions).
E. A kernel trap does not require context switch even though the OS code, not the user code, is being executed.
F. The process control block (PCB) should have a pointer pointing to the list of all waiting processes.
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