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You're reading from Linux Kernel Programming A comprehensive guide to kernel internals, writing kernel modules, and kernel synchronization

Product type Paperback

Published in Mar 2021

Publisher Packt

ISBN-13 9781789953435

Length 754 pages

Edition 1st Edition

Languages

Tools

Linux

Concepts

System Administration

Author (1):

Kaiwan N. Billimoria

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Table of Contents (19) Chapters

Preface

1. Section 1: The Basics

2. Kernel Workspace Setup FREE CHAPTER

3. Building the 5.x Linux Kernel from Source - Part 1

4. Building the 5.x Linux Kernel from Source - Part 2

5. Writing Your First Kernel Module - LKMs Part 1

6. Writing Your First Kernel Module - LKMs Part 2

7. Section 2: Understanding and Working with the Kernel

8. Kernel Internals Essentials - Processes and Threads

9. Memory Management Internals - Essentials

10. Kernel Memory Allocation for Module Authors - Part 1

11. Kernel Memory Allocation for Module Authors - Part 2

12. The CPU Scheduler - Part 1

13. The CPU Scheduler - Part 2

14. Section 3: Delving Deeper

15. Kernel Synchronization - Part 1

16. Kernel Synchronization - Part 2

17. About Packt

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Viewing the kernel segment on a Raspberry Pi via dmesg

Before jumping into and analyzing the code for such a kernel module, the fact is that something pretty similar to what we're attempting here – printing the location and size of various interesting regions within the kernel segment/VAS – is already performed at early boot on the popular Raspberry Pi (ARM) Linux kernel. In the following snippet, we show the relevant output from the kernel log when the Raspberry Pi 3 B+ (running the stock (default) 32-bit Raspberry Pi OS) boots:

rpi $ uname -r
4.19.97-v7+
rpi $ journalctl -b -k
[...]
Apr 02 14:32:48 raspberrypi kernel: Virtual kernel memory layout:
                       vector  : 0xffff0000 - 0xffff1000   (   4 kB)
                       fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
                       vmalloc : 0xbb800000 - 0xff800000   (1088 MB)
                       lowmem  : 0x80000000 - 0xbb400000   ( 948 MB)
                       modules : 0x7f000000 - 0x80000000...

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Authors (1)

Kaiwan N. Billimoria

Kaiwan N. Billimoria taught himself BASIC programming on his dad's IBM PC back in 1983. He was programming in C and Assembly on DOS until he discovered the joys of Unix, and by around 1997, Linux! Kaiwan has worked on many aspects of the Linux system programming stack, including Bash scripting, system programming in C, kernel internals, device drivers, and embedded Linux work. He has actively worked on several commercial/FOSS projects. His contributions include drivers to the mainline Linux OS and many smaller projects hosted on GitHub. His Linux passion feeds well into his passion for teaching these topics to engineers, which he has done for well over two decades now. He's also the author of Hands-On System Programming with Linux, Linux Kernel Programming (and its Part 2 book) and Linux Kernel Debugging. It doesn't hurt that he is a recreational ultrarunner too.

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