Operating systems notes
I/O Hardware & Software Layers
How one read() call reaches a disk, a keyboard or a network card, and stays the same shape for all of them. Every section is a drawn page beside a clear written explanation, about 17 minutes in all.
- Chapter 26 of 37
- About 17 minutes
- 8 sections
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In this chapter
- Why I/O is genuinely hard
- Device controllers & their registers
- Talking to a device: polling
- Interrupts: let the device tell you
- DMA: moving bulk data without the CPU
- The I/O software layers
- Device drivers & the uniform interface
- Buffering, caching & why engineers care
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