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Linux Kernel Programming Part 2 - Char Device Drivers and Kernel Synchronization

You're reading from   Linux Kernel Programming Part 2 - Char Device Drivers and Kernel Synchronization Create user-kernel interfaces, work with peripheral I/O, and handle hardware interrupts

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Product type Paperback
Published in Mar 2021
Publisher Packt
ISBN-13 9781801079518
Length 452 pages
Edition 1st Edition
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Author (1):
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Kaiwan N. Billimoria Kaiwan N. Billimoria
Author Profile Icon Kaiwan N. Billimoria
Kaiwan N. Billimoria
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Table of Contents (11) Chapters Close

Preface 1. Section 1: Character Device Driver Basics
2. Writing a Simple misc Character Device Driver FREE CHAPTER 3. User-Kernel Communication Pathways 4. Working with Hardware I/O Memory 5. Handling Hardware Interrupts 6. Working with Kernel Timers, Threads, and Workqueues 7. Section 2: Delving Deeper
8. Kernel Synchronization - Part 1 9. Kernel Synchronization - Part 2 10. Other Books You May Enjoy

Summary

Congratulations! This chapter has been long but worthwhile. You will have learned a lot regarding how to work with hardware interrupts. We started by briefly looking at how the OS handles interrupts before learning how you, as a driver author, must work with them. To do so you learned how to, via several methods, allocate IRQ lines (and free them) and implement the hardware interrupt routine. Here, several limitations and caveats, essentially boiling down to the fact that it's an atomic activity, were discussed. The hows and whys of the "threaded interrupt" model were then covered; it's often regarded as the modern recommended way to handle interrupts. After that, we understood and learned how to work with hardirqs/softirqs and top/bottom halves. Finally, we covered, in typical FAQ style, information which taught you about load balancing interrupts, IRQ stacks, and how to employ some useful frameworks and tools that can measure interrupt metrics and latencies...

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