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Linux Kernel Programming

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

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Product type Paperback
Published in Mar 2021
Publisher Packt
ISBN-13 9781789953435
Length 754 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 (19) Chapters Close

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 18. Other Books You May Enjoy

Booting our VM via the GNU GRUB bootloader

Now our guest VM (using the Oracle VirtualBox hypervisor) is about to come up; once its (emulated) BIOS routines are done, the GNU GRUB bootloader screen shows up first. This happens because we quite intentionally changed the GRUB_HIDDEN_TIMEOUT_QUIET GRUB configuration directive to the value of false. See the following screenshot (Figure 3.3). The particular styling seen in the screenshot is how it's customized to appear by the Ubuntu distro:

Figure 3.3 – The GRUB2 bootloader – paused on system startup

Now let's go straight into booting our VM:

  1. Press any keyboard key (besides Enter) to ensure the default kernel is not booted once the timeout (recall, we set it to 3 seconds) expires.
  2. If not already there, scroll to the Advanced options for Ubuntu menu, highlighting it, and press Enter.
  3. Now you'll see a menu similar, but likely not identical, to the following screenshot (Figure 3.4). For...
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