drew
/
acadia
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases 1 Wiki Activity
Hobby Operating System
632 Commits 1 Branch 1 Tag 1.7 MiB
C++ 51.8%
Rust 35.1%
C 5.3%
Jinja 2.5%
Python 2.2%
Other 3.1%
Go to file
Drew Galbraith dc801786b1 [VFS] Move victoria falls to rust. (Breaks voyageurs) 
Move victoria falls to rust, which allows us to remove both the denali
and victoria falls C++ code. This disk driver appears to work properly
but has highlighted some instability in the voyageus xhci implementation
which now breaks.
 		2025-05-05 19:37:53 -07:00
lib Fix repeated message serialization in cpp yunq. 2025-02-01 14:08:35 -08:00
rust [VFS] Move victoria falls to rust. (Breaks voyageurs) 2025-05-05 19:37:53 -07:00
scripts [VFS] Move victoria falls to rust. (Breaks voyageurs) 2025-05-05 19:37:53 -07:00
sys [VFS] Move victoria falls to rust. (Breaks voyageurs) 2025-05-05 19:37:53 -07:00
sysroot [Voyageurs] Add a basic ps/2 keyboard driver. 2023-11-25 13:08:30 -08:00
toolchain Build GCC/Binutils toolchain in tree. (#1) 2023-06-15 18:39:14 -04:00
usr [Zion] Add a thread sleep call. 2023-12-07 00:20:03 -08:00
yunq [VFS] Move victoria falls to rust. (Breaks voyageurs) 2025-05-05 19:37:53 -07:00
zion [Zion] Don't try to set state on dying threads in cleanup. 2025-05-03 14:54:03 -07:00
.ccls Specify our target in .ccls 2023-06-16 23:15:41 -07:00
.clang-format Add a clang format spec 2023-05-17 20:30:15 -07:00
.gdbinit Add a kernel ELF module and load it in a new process. 2023-05-29 00:32:54 -07:00
.gitignore Add ccls cache to gitignore. 2025-05-03 14:48:42 -07:00
CMakeLists.txt Bump cmake version. 2025-05-03 14:44:55 -07:00
LICENSE Add LICENSE and README 2023-05-31 00:03:44 -07:00
README.md Update README. 2023-12-05 17:02:16 -08:00
RELEASES.md Draft 0.1.1 release notes added with work so far. 2024-01-11 20:53:31 -08:00
init-dbg.sh [Zion] Enable SSE instructions at the start of boot. 2023-11-20 16:40:07 -08:00

README.md

AcadiaOS

AcadiaOS is a hobby operating system I use to explore and learn about OS development.

It is built on top of a small capability-based microkernel that provides memory management, process scheduling, and hardware access.

Directory Structure

The subdirectories of the project are as follows:

  • zion: Contains kernel code as well as a couple headers that user space uses to interface with the kernel.
  • lib: Library code used by the kernel and user space.
  • sys: System services.
  • sysroot: Files that are copied to the root filesystem.
  • toolchain and scripts: Contain tooling for the cross-compile environment.
  • yunq: Contains the El Yunque IDL used for IPC between processes in userspace.

Where available, further documentation about each of these components can be found in the README fi les in each respective subdirectory.

Building AcadiaOS

Run ./scripts/build_toolchain.sh to build a gcc cross-compile toolchain for the project. This step may take a long time (~5 mins on my new laptop, ~45 mins on my 2013 laptop).

Run ./init-dbg.sh to initialize the CMake project.

Run ./scripts/qemu.sh to build and run AcadiaOS in a VM. I usually run this from the builddbg directory so it is easier to run ninja clean when necessary (for instance when updating yunq files).

System Dependencies

On arch linux I require the following packages to build this project:

base-devel limine dosfstools parted cmake ninja qemu-desktop qemu-system-x86

Boot Process

AcadiaOS uses the limine bootloader to enter into a 64-bit kernel in the negative 2GB address space (mcmodel kernel).

The Zion kernel then sets up interrupts, scheduling, and memory management before passing off control to the Yellowstone process.

The kernel passes capabilities to the Denali and VictoriaFalls binaries to the Yellowstone process to allow it to manage the rest of the boot process.

The Yellowstone, Denali, and VictoriaFalls processes are all passed at boot using limine modules, however any subsequent processes are loaded off disk.