LegacyOS is an operating system meant to run on old systems. Eventually, this project aims to be a complete operating system, with drivers, userland, system calls, and generally everything that a user expects to find.
Special thanks to the OSDev wiki for having nice tutorials and documentation and providing a good reference for implementing some libc functions!
Currently, the only supported architecture is x86. This operating system is meant for 32-bit BIOS systems. 64-bit BIOS will also work, but LegacyOS does not make use of 64-bit capabilities (or at least not yet), so it's basically the same thing. UEFI will boot, but there will be no video output, as the video driver is designed with VGA memory in mind, which does not exist in UEFI computers. However, what you can do to make this work on UEFI computers is boot in Legacy mode (this setting can be changed inside the UEFI firmware, but it is most likely already turned on from the factory).
- Video driver
- PS/2 keyboard support
- RTC reading
- RTC writing
- Storage/filesystem(s)
- Make proper use of Multiboot
- Shell (in progress)
- Memory management
More soon...
LegacyOS uses shell scripts and makefiles to create its
bootable image. Specifically, all you need to do is
run the generateISO.sh script to build the OS and
create the image, and then optionally qemu.sh to run it
within the QEMU emulator. All you need is clang,make
and nasm for building, and grub-mkrescue along with
its dependencies (notably xorriso and GNU mtools) to create the image.
LegacyOS is licensed under the MIT license. This permits using this code with pretty much no limitation. See LICENSE for details.