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The Helios microkernel

Submitted by Roy Schestowitz on Monday 13th of June 2022 02:47:35 PM Filed under
OS

I’ve been working on a cool project lately that I’d like to introduce you to: the Helios microkernel. Helios is written in Hare and currently targets x86_64, and riscv64 and aarch64 are on the way. It’s very much a work-in-progress: don’t expect to pick this up and start building anything with it today.

Drawing some inspiration from seL4, Helios uses a capability-based design for isolation and security. The kernel offers primitives for allocating physical pages, mapping them into address spaces, and managing tasks, plus features like platform-specific I/O (e.g. reading and writing x86 ports). The entire system is written in Hare, plus some necessary assembly for the platform bits (e.g. configuring the GDT or IDT).

Things are still quite early, but I’m pretty excited about this project. I haven’t had this much fun hacking in some time Smile We have several kernel services working, including memory management and virtual address spaces, and I’ve written a couple of simple drivers in userspace (serial and BIOS VGA consoles). Next up is preemptive multi-tasking — we already have interrupts working reliably, including the PIT, so all that’s left for multi-tasking is to actually implement the context switch. I’d like to aim for an seL4-style single-stack system, though some finageling will be required to make that work.

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