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Linux Kernel Programming

You're reading from  Linux Kernel Programming

Product type Book
Published in Mar 2021
Publisher Packt
ISBN-13 9781789953435
Pages 754 pages
Edition 1st Edition
Languages
Author (1):
Kaiwan N. Billimoria Kaiwan N. Billimoria
Profile icon Kaiwan N. Billimoria
Toc

Table of Contents (19) Chapters close

Preface 1. Section 1: The Basics
2. Kernel Workspace Setup 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

Macros and variables describing the kernel segment layout

To write a kernel module that displays relevant kernel segment information, we need to know how exactly to interrogate the kernel with regard to these details. In this section, we will briefly describe a few key macros and variables within the kernel representing the memory of the kernel segment (on most architectures, in descending order by KVA):

  • The vector table is a common OS data structure – it's an array of function pointers (aka a switching or jump table). It is arch-specific: ARM-32 uses it to initialize its vectors such that when a processor exception or mode change (such as an interrupt, syscall, page fault, MMU abort, and so on) occurs, the processor knows what code to run:
Macro or variable
Interpretation
VECTORS_BASE Typically ARM-32 only; start KVA of a kernel vector table spanning 1 page
  • The fix map region is a range of compile-time special or reserved virtual addresses; they are employed...
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