Give at least 2 reasons that modern operating systems switch from user to kernel mode to perform I/O operations, such as turning on a webcam or using a microphone. Provide 3 other examples of such I/O operations. For each example, describe the process for doing this in general terms. Are the reasons that you stated worth the overhead of switching from user mode to kernel mode, and then back to user mode? If you were to design an OS, what would you do differently?

Principles of Information Systems (MindTap Course List)
12th Edition
ISBN:9781285867168
Author:Ralph Stair, George Reynolds
Publisher:Ralph Stair, George Reynolds
Chapter4: Software: Systems And Application Software
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Give at least 2 reasons that modern operating systems switch from user to kernel mode to perform I/O operations, such as turning on a webcam or using a microphone. Provide 3 other examples of such I/O operations. For each example, describe the process for doing this in general terms. Are the reasons that you stated worth the overhead of switching from user mode to kernel mode, and then back to user mode? If you were to design an OS, what would you do differently? 

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