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TauOS

An operating system principally targeting AArch64, the overall intention is to build something vaguely Unix-like that runs on a variety of consumer Arm hardware, as well as the QEMU virt machine.

In terms of architecture, although early. I intend to build the system as a hybrid/micro-kernel borrowing ideas from Minix, Linux and the BSDs.

High Level Features

  • Uses Linux Kernel Boot Protocol
  • Runtime kernel address patching (KASLR without the 'R')
  • Rudimentary device tree parsing
  • Higher-half kernel logical map derived from advertised memory in the device tree
  • Kernel page allocator, implemented using a buddy allocator
  • And a trivial PL011 UART driver ;)

Things I am working on

  • Kernel modules
    • To make the core kernel as generic as possible, board specific code is to be loaded dynamically from the initial ramdisk
    • To support this further, I may try to support conditional compilation s.t only a subset of modules are included

Building

Install the cross compiler toolchain and qemu with...

./bin/get-toolchain

# For RHEL derived distros
sudo dnf install qemu-system-aarch64 libguestfs

Build the kernel with...

# Generate the kernel compile time configuration for qemuvirt
make qemuvirt_config

# Build the kernel
make

Run the kernel with

make run

Other

I write about some of the ideas that I come across developing this operating system on my website, in the hopes that they are useful for others. I try to encapsulate a particular topic in a singular commit.

This is my 2nd attempt at building an operating system, if you are looking for a collection of code/drivers for the BCM2711, they can be found on this branch