Answer Posted / softy

There are 2 situations when Linux can switch from user Space
to Kernel Space:-

1) by doing System calls
2) When interrupt comes (to handle interrupt)
3) by executing 128 (0x80 ) instruction or doing sysenter

Linux can switch from kernel Space to User space:-
1) process in kernel mode is preempted.
2) After completion of Interrupt handler / System call
3) performing sysexit sys call

what are different ways the context switch happens from user to kernel space or vice-versa ?

2138

What are system calls used for process management in linux?

581

I would like to know whether Simado and Setu products are they EPBX or not ?

1926

Explain process management system calls in linux?

540