Linux Kernel Init Process
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The document discusses the kernel initialization process, focusing on module initialization and the different initcall sections such as `init_setup` and `security_initcall`. It provides a detailed explanation of various demonstrations and examples related to the initialization in the context of Linux kernel version 3.2, along with pros and cons of using init calls. The document concludes with a summary of the findings and contact information for the author, Boaz Taitler.
Linux Kernel Init Process
- 1. Boaz Taitler KERNEL INIT PROCESS
- 3. On the menu • Module Init • Initcalls Sections • Init pages clean up • Run init process
- 5. The Magic - Sections Include/asm-generic/vmlinux.lds.h
- 6. Sections - example Symbol group 3 Symbol group 2 Symbol group 1 Symbol group 4
- 8. The gathering - Initcall
- 9. The gathering - Initcall
- 11. Example:
- 12. Let’s call ‘em! Init/main.c (v3.2)
- 17. Do it yourself: Result System.map
- 18. Cons / Pros: • Cons: • Require more memory • Architecture dependent • Pros: • Easy for maintenance • Generic Calls • Looks cool :D
- 19. When to use When you: • Need to add new calls • Don’t want to affect the function where you summon the calls • Want to iterate over functions.
- 20. Init examples:
- 22. Barebox
- 23. Conclusions 1. Init calls can be called __barebox_cmd 2. Summing 2 pictures result in a big picture
- 24. Finishing touches • Clean init pages • Run init process
- 25. Clear init pages
- 29. One last thing Run init process
- 31. Questions?
- 32. Thank you Contact: • Boaz taitler • boaztait@gmail.com