Setup env

On NixOS:

• Ensure Linux Kernel is the same as you configuration. Otherwise, change linux_dev variable with you kernel variant and change flake.lock nixpkgs with your version.
• Use direnv allow or nix develop to setup shell.

On other distros:

1. With Nix env, .envrc, change line by use flake .#other

2. Without Nix env, you need to setup LINUX_MODULES_FOLDER to linux modules folder of your distro (ex: /lib/modules/$(uname -r)) in your shell (bashrc)

make : targets list

• all : Compiling kernel
• clean : Cleaning build folder

All subfolder is configured to use LINUX_MODULES_FOLDER env variable set by flake develop

How test module

Step 1: Load module

sudo insmod [module_name].ko

Warning: Can fail if secure boot is enabled

Step 2: Check logs

sudo dmesg | tail

Step 3: Unload module

sudo rmmod [module_name].ko

Usefull links

• https://www.kernel.org/doc/html/latest/
• https://elixir.bootlin.com/linux/v6.13/source/

Notes

1. Find required headers files

nix shell nixpkgs#bear
cd 01_basic_module/
bear --append --output ../.vscode/compile_commands.json -- make -C $LINUX_MODULES_FOLDER/build M=$PWD modules

Search -I args and -D args