x86,aarch64,arm

Ciro Santilli 67a7414f8c bak		8 tahun lalu
buildroot @ 083c0735e9	338756a029 bak	8 tahun lalu
host	690284a3bf Userland test programs	8 tahun lalu
kernel_module	67a7414f8c bak	8 tahun lalu
rootfs_overlay	ad077d3943 Workqueue works! QEMU CLI mode with -n for panic	8 tahun lalu
.gitignore	d45ceace5d 0	8 tahun lalu
.gitmodules	338756a029 bak	8 tahun lalu
README.md	9370512176 delay attempt 2	8 tahun lalu
bibliography.md	bf3bb0cb18 fops read returns some data, busybox config frag for stat, bibliography start	8 tahun lalu
build.md	8eb878c24e update	8 tahun lalu
busybox_config_fragment	bf3bb0cb18 fops read returns some data, busybox config frag for stat, bibliography start	8 tahun lalu
introduction.md	d45ceace5d 0	8 tahun lalu
kernel_config_fragment	0279ae3bad Better name for config fragment	8 tahun lalu
kmod.md	d45ceace5d 0	8 tahun lalu
run	9370512176 delay attempt 2	8 tahun lalu

Linux Kernel Module Cheat

Run one command, get into QEMU Buildroot BusyBox with several minimal Linux kernel 4.9 module example tutorials. Tested in Ubuntu 14.04.

Usage:

./run

First build will take a while (GCC, Linux kernel).

QEMU opens up, and you can run:

insmod /hello.ko
insmod /hello2.ko
rmmod hello
rmmod hello2

Each module comes from a C file under kernel_module/. For module usage do:

head *. use Buildroot's default kernel version, you can confirm it after build with:

grep BR2_LINUX_KERNEL_VERSION buildroot/.config

We use printk a lot, and it shows on the QEMU terminal by default. If that annoys you (e.g. you want to see stdout separately), do:

dmesg -n 1

When your kernel starts crashing, get the full trace with:

./run -n