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Your USB mouse moving ...
... generates an interrupt
... is detected by polling
If polling detects movement, interrupts are generated
Polling after an interrupt
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Direct memory access (DMA) writes ...
... into a process' virtual memory, defined by address and size
... into physical memory, defined by address and size
... into arbitrary physical memory, as chosen by the DMA controller
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What causes most system crashes today?
The OS, in particular Windows
Bad device drivers
User applications
Faulty hardware
Viruses and/or the NSA!
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