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| n | Virtually all
OS code gets executed within the |
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| context of a
user process |
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| n | On Interrupts,
Traps, System calls: the CPU |
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| switch to
kernel mode to execute OS routine |
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| within the
context of user process (mode switch) |
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| n | Control passes
to process switching functions |
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| (outside
processes) only when needed |
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