taos

This project is the result of following Philipp Oppermann's series of tutorials in building a small operating system kernel targeting x86-64, along with some minor modifications and additions.

The OS so far features:

• VGA output
• unit and integration tests
• CPU exception handling
• Keyboard hardware interrupt handling
• Virtual memory using paging
• Heap allocation with a choice of three different allocation techniques. Default is fixed-size block allocation
• Cooperative multitasking using async/await, using custom task Executor and Wakers

Setup

Install qemu-system-x86_64.

Use rustup to install Rust nightly. The rust-toolchain file specifies that Rust nightly will be used.

Running

cargo run will launch the OS inside of QEMU. It's pretty bare-bones at the moment, the only visible result will be the outputting keyboard input to the VGA display. Under the hood keyboard strokes are added to a queue by a hardware interrupt handler and asynchronously written to VGA memory.

cargo test will run all tests.

TODO

• add a small file system that persists across restarts of the OS
• add a basic shell
• add some VGA convenience functions to be used in a shell (e.g. clear/reset)