http://ift.tt/eA8V8J
When the kernel is needed, the program makes a system call, the processor switches to kernel mode and enters the kernel. When it is done, the CPU is told to switch back to user mode, reenter the process. Think of the kernel as God sitting on a cloud, looking down on Earth. It's there but no one on Earth ...
from Google Alert - CPU processor http://ift.tt/2A8bckl
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