Ariel OS: An Embedded Rust Operating System for Networked Sensors & Multi-Core Microcontrollers

Large swaths of low-level system software building blocks originally implemented in $\mathrm{C} / \mathrm{C}++$ are currently being swapped for equivalent rewrites in Rust, a relatively more secure and dependable programming language. So far, however, no embedded OS in Rust supports multicore preemptive scheduling on microcontrollers. In this paper, we thus fill this gap with a new operating system: Ariel OS. We describe its design, we provide the source code of its implementation, and we perform microbenchmarks on the main 32-bit microcontroller architectures: ARM Cortex-M, RISC-V and Espressif Xtensa. We show how our scheduler takes advantage of several cores, while incurring only small overhead on single-core hardware. As such, Ariel OS provides a convenient embedded software platform for small networked devices, for both research and industry practitioners.