OS3

Hobby bootable software suite for x86 (NOT x86_64) systems.

Building

This repository needs 2 separate compilers to function:

a generic C/C++ compiler for the "host" (whatever architecture that may be)
a i686-elf GCC/Binutils cross-compiler accessible in the path (i686-elf-gcc, i686-elf-objcopy, etc...)

It also needs mkfs.vfat (or newfs_msdod on macOS).

The build system is cmake.

First, generate the host utilities:

cmake -S host -B build/host
cmake --build build/host

Then, generate the bootable image:

cmake -S . -B build -DCMAKE_TOOLCHAIN_FILE=CMakeToolchain.txt
cmake --build build

The image might run (the main branch is not a stable one) via qemu and the following command:

qemu-system-i386 --hda build/kernel.img

In order of dependency:

Library for handling FAT32 file systems. Can be built for both kernel or host.

Common headers shared between host tools and kernel code.

A collection of host tools required to build the bootable image

Stands for "Master Boot Record". It's an assembly file designed to be bootable from MBR x86 systems. (EFI Incompatible).

Stage 1 bootloader. Written in C. Should initialize most required drivers (USB, Disks, ACPI, Video). Currently not done.

Disk image. It's built in multiple stages via various host tools.