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10 Cards in this Set
- Front
- Back
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What does the core of the CPU contain? |
Control Unit, ALU, Generic registers, PC, Stack Pointer, Program Status Word (CCR), Cache memory. |
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What are the two processor modes? |
Kernel/User. |
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What mode does the OS run in? |
Kernel. |
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How can a program enter kernel mode? |
Software trap (interrupt intended to initiate a context switch). |
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What functions are usually forbidden in user mode? |
I/O and memory functions. |
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What do I/O devices consist of? |
The device itself, and a controller (with registers). |
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What talks to an I/O device controller? |
Device driver. |
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Why bother having an OS? |
Each application would be responsible for running the computer! |
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Where does the OS exist? |
On top of the hardware, below application programs. |
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What mode does the Kernel run in? Why? |
kernel mode (supervisor mode) to protect it from tampering. |
