This project includes a submodule for linux and mkroot.
Scripts will be provided for automatically compiling linux,
making a basic initramfs via mkroot,
compiling basic kernel modules,
and running them in an emulated system via QEMU.
# NOTE: this will clone linux which takes forever
git clone --recursive https://github.com/ntegan/hello_modules
bash make.sh
This will first build the linux kernel,
should see output similar to this when done
Don't see a kernel, attempting to make it
linux makedefconfig with PID: 59685
Elapsed Time: 0 min 3 secs
*** Default configuration is based on 'x86_64_defconfig'
building linux kernel with PID: 60010
Elapsed Time: 19 min 7 secss
GZIP arch/x86/boot/compressed/vmlinux.bin.gz
This is where kernel modules will be built.
They will then be placed inside of the initramfs
for access in the minimal system.
TODO:
This will then build a minimal rootfs/initramfs,
should see output similar to this when done
Don't see a root/initramfs, making
making initramfs/rootfs PID: 127189
Elapsed Time: 0 min 49 secs
Trying libraries: crypt m
making the root archive
6152 blocks
Ubuntu (and other distributions) provide an archive of their base rootfs
check here
There is now a bootable linux system with
kernel: linux/arch/$(uname -m)/boot/bzImage
initramfs: mkroot/output/host/root.cpio.gz
Run with
bash runqemu.sh
Modules should be in the home directory of the rootfs,
Type exit when done.
/ # cd
/home # ls
hello.ko
/home # insmod hello.ko
[ 13.296718] hello, world
/home #