BuildBasicKernel.md

Build Basic Kernel

Hello World

• MACROs
  • __init & __exit
  • module_init() & module_exit()
• Basic Makefile
• Install and Remove

Passing Command Line Arguments

• MACRO
  • module_param()
• Install and pass parameter from command line
• Licensing and module description
  • MODULE_LICENSE()
  • MODULE_DESCRIPTION()
  • MODULE_AUTHOR()

Export Symbol

A module wants to export a symbol (i.e. function or global variable)

• MACROs
  • EXPORT_SYMBOL()
  • EXPORT_SYMBOL_GPL() (only the kernrl who also uses GPL license can use the exported symbol)

A symbol must be exported at the global part of the code.