Why do system calls generally take more time than simple procedure calls? Explain why you would generally expect differences in system call vs. procedure call overhead between different types of processors. What events cause the CPU to switch from User Mode to Kernel Mode? Describe each such event. What events cause the CPU to switch from Kernel Mode to User Mode? Describe each such event. Why do system calls generally take more time than simple procedure calls? Explain why you would generally expect differences in system call vs. procedure call overhead between different types of processors. What events cause the CPU to switch from User Mode to Kernel Mode? Describe each such event. What events cause the CPU to switch from Kernel Mode to User Mode? Describe each such event