Which are the three different ways the cpu can go from user mode to kernel mode?
1 answer:
- Fault (e.g. a page fault or some other exception caused by executing an instruction)
- Interrupt (e.g. a keyboard interrupt or I/O finishing)
- Trap (e.g. a system call)
<h3>How do I switch from user mode to kernel mode?</h3>
- The mode bit is set to 0 in the kernel mode. It is changed from 0 to 1 when switching from kernel mode to user mode.
- In the above image, the user process executes in the user mode until it gets a system call.
- Then a system trap is generated and the mode bit is set to zero.
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I think A and then C. Hope I helped.
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