This repository contains the source code for a hobbyist 32-bit monolithic kernel inspired by several UNIX like operating systems. Nothing too significant this project at this time.
My main goal with this project is simply to develop self-hosted UNIX clone for my own benefit. I would like to minimize the use of third party software as much as possible, however, there are a few exceptions, most notability the use of newlib for the C library as well as GRUB for the bootloader.
Compiling this requires a custom GCC capable of targeting this kernel. Patching GCC and dealing with GNU autocruft is a long and tedious process. I've done my best to attempt to automate as much of this as possible. I first recommend this be built from a Centos 7 environment. You can use something like docker or podman on GNU/Linux systems or WSL on Windows (See CentWSL to get a Centos 7 image for WSL).
Once in a Centos 7 environment, install the pre-requisites by running:
yum install -y gcc gcc-c++ vim git wget m4 perl-Data-Dumper patch gmp-devel mpfr-devel libmpc-devel make nasm grub2 xorriso
Then, to build, simply run make toolchain userland-libraries userland kernel iso. An ISO image should be created in build/os.iso
| Path | Description |
|---|---|
| /bin | Core userland utilities found in /bin |
| /build | Houses toolchain and temporary files required for build process |
| /sbin | Source for userland binaries installed in /sbin |
| /sys | Source for the kernel itself |
| /sys/dev | Kernel device implementations |
| /sys/fs | Kernel filesystem implementations |
| /sys/kern | Core kernel components |
| /sys/net | Kernel network protocol implementations |
| /sys/i686 | i686 architecture dependent source |
| /sys/i686/dev | i686 device implementations |
| /sys/i686/kern | i686 kernel components |
| /usr.lib | Usermode libraries |
| /usr.libexec | Source for userland binaries installed in /usr/libexec |