better sections for linux blog post

This commit is contained in:
Mahdi Dibaiee 2021-11-20 12:16:01 +00:00
parent 20ade0c6d6
commit 14b9f9fc4b

View File

@ -8,55 +8,61 @@ author: Mahdi
published: false published: false
--- ---
November 6th: I use a MacBook Pro (mid-2014) with macOS, so I need to have a virtual machine for running a linux system with my kernel. I will also be doing the coding on this linux virtual machine as building the kernel is easier in a linux system than macOS.
Create a virtual machine for Archlinux on my macOS using QEMU:
- [Download the Archlinux iso image](https://archlinux.org/download/) # Setting up the Virtual Machine (Archlinux)
- Create a qemu disk:
I create a virtual machine with Archlinux on my macOS using QEMU:
1. [Download the Archlinux iso image](https://archlinux.org/download/)
2. Create a qemu disk:
{% highlight bash %} {% highlight bash %}
qemu-img create disk.img 15G qemu-img create disk.img 15G
{% endhighlight %} {% endhighlight %}
- Start the machine and [install Archlinux](https://wiki.archlinux.org/title/Installation_guide) 3. Start the machine and [install Archlinux](https://wiki.archlinux.org/title/Installation_guide)
{% highlight bash %} {% highlight bash %}
qemu-system-x86_64 -cdrom archlinux-2021.11.01-x86_64.iso -boot order=d -drive format=raw,file=disk.img -m 8G qemu-system-x86_64 -cdrom archlinux-2021.11.01-x86_64.iso -boot order=d -drive format=raw,file=disk.img -m 8G
{% endhighlight %} {% endhighlight %}
- Start the machine after installing (note I forward 2222 to 22 so I can SSH/SCP to the virtual machine. I also set 4 CPUs so I can use threads for faster builds in the VM) 4. Start the machine after installing (note I forward 2222 to 22 so I can SSH/SCP to the virtual machine. I also set 4 CPUs so I can use threads for faster builds in the VM)
{% highlight bash %} {% highlight bash %}
qemu-system-x86_64 -boot -drive format=raw,file=disk.img -m 8G -smp cpus=4 -net user,hostfwd=tcp::2222-:22 -net nic qemu-system-x86_64 -boot -drive format=raw,file=disk.img -m 8G -smp cpus=4 -net user,hostfwd=tcp::2222-:22 -net nic
{% endhighlight %} {% endhighlight %}
- Install dependencies: 5. Install dependencies for building the kernel:
{% highlight bash %} {% highlight bash %}
pacman -S gcc git make pacman -S gcc git make
{% endhighlight %} {% endhighlight %}
- Clone linux: 6. Clone linux:
{% highlight bash %} {% highlight bash %}
git clone git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git git clone git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
{% endhighlight %} {% endhighlight %}
- Install necessary dependencies 7. necessary dependencies
{% highlight bash %} {% highlight bash %}
pacman -S flex base-devel xmlto kmod inetutils bc libelf git cpio perl tar xz pacman -S flex base-devel xmlto kmod inetutils bc libelf git cpio perl tar xz
{% endhighlight %} {% endhighlight %}
- Copy configuration of archlinux (optional: also [use modprobed-db to remove unnecessary modules](https://wiki.archlinux.org/title/Kernel/Traditional_compilation#Default_Arch_configuration)) 8. Copy configuration of archlinux (optional: also [use modprobed-db to remove unnecessary modules](https://wiki.archlinux.org/title/Kernel/Traditional_compilation#Default_Arch_configuration))
{% highlight bash %} {% highlight bash %}
zcat /proc/config.gz > .config zcat /proc/config.gz > .config
{% endhighlight %} {% endhighlight %}
- Make! The `-j8` parameter specifies the number of threads to be used by the build. My CPU has 8 threads and so I use it all. 9. Make! The `-j8` parameter specifies the number of threads to be used by the build. My CPU has 8 threads and so I use it all.
{% highlight bash %} {% highlight bash %}
make -j8 make -j8
{% endhighlight %} {% endhighlight %}
- Install the newly built Kernel. I create this as a script file and run it after every build from the root of repository. 10. Install the newly built Kernel. I create this as a script file and run it after every build from the root of repository.
{% highlight bash %} {% highlight bash %}
make -j8 modules_install make -j8 modules_install
RELEASE=$(cat include/config/kernel.release) RELEASE=$(cat include/config/kernel.release)
cp -v arch/x86_64/boot/bzImage /boot/vmlinuz-linux${RELEASE} cp -v arch/x86_64/boot/bzImage /boot/vmlinuz-linux${RELEASE}
mkinitcpio -k $RELEASE -g /boot/initramfs-linux${RELEASE}.img mkinitcpio -k $RELEASE -g /boot/initramfs-linux${RELEASE}.img
mkinitcpio -k $RELEASE -s autodetect -g /boot/initramfs-linux-fallback${RELEASE}.img mkinitcpio -k $RELEASE -s autodetect -g /boot/initramfs-linux-fallback${RELEASE}.img
{% endhighlight %}
- Run grub-mkconfig to add a menu option for this new kernel
{% highlight bash %}
grub-mkconfig -o /boot/grub/grub.cfg grub-mkconfig -o /boot/grub/grub.cfg
{% endhighlight %} {% endhighlight %}
- Reboot and choose the new kernel (might be under "Advanced" in the bootloader) - Reboot and choose the new kernel (might be under "Advanced" in the bootloader)
- Setup your environment for development. Mine consists of setting up tmux so I can have multiple terminals and neovim.
# Development Environment
Setup your environment for development. Mine consists of setting up tmux so I can have multiple terminals and neovim.
In the guest machine:
{% highlight bash %} {% highlight bash %}
pacman -S neovim openssh tmux pacman -S neovim openssh tmux
echo '[[ -z "$TMUX" ]] && exec tmux' >> /etc/profile echo '[[ -z "$TMUX" ]] && exec tmux' >> /etc/profile
@ -69,7 +75,7 @@ scp -P 2222 ~/.tmux.conf root@localhost:/root
scp -r -P 2222 ~/.config/nvim root@localhost:/root/.config/ scp -r -P 2222 ~/.config/nvim root@localhost:/root/.config/
{% endhighlight %} {% endhighlight %}
# Debugging Logs # Debugging
There is a `pr_debug` function used over the code, in order to enable those logs in `dmesg` for a specific module, you can do this: There is a `pr_debug` function used over the code, in order to enable those logs in `dmesg` for a specific module, you can do this:
{% highlight bash %} {% highlight bash %}