HubrisOS Stories and Remarks

Hubris is a memory protected ROTS written in Rust by Oxide Computer. I enjoy using it commercially - especially with large ¹¹ Larger than 200kb! Absurdly large for a MCU. untrustworthy third party C libraries that are occasionally prone to Hardfaults (the microcontroller equivalent of segmentation faults).

• Unexpected gotchas porting the STM32G0B1
• Modifying HubrisOS for Battery Powered Products
• A shared flash filesystem with operations checked at compile time
• Custom Syscalls - Structuring to dodge open source disclosure requirements
• Speed costs of microkernels, and workarounds
• Space costs of memory protection on the Cortex-M0+, and workarounds
• Don’t try this at home: Bypassing IPC priority rules
• Serial IO, DMA, and sleep mode
• Why can’t we move println!(…) formatting routines into a shared task?
• Printing Hardfaults
• Running a C library compiled in gcc inside a HubrisOS task compiled in LLVM
• Meddling in other tasks affairs: The Factory Test Daemon