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Neat, I didn't know that the MPU fault handler was complete enough to allow for restarts.
Now that the source is available, I took a look at what hubris does - it is not actually anything fancy, just a static list of up to 8 MPU regions per task [1].
It seems that leases aren't actually shared memory, but rather just grant permission for a memcpy-like syscall [2]. This is slightly better than plain message passing as the recipient gets to decide what memory it wants to access, but is still a memcpy.
[1] https://github.com/oxidecomputer/hubris/blob/8833cc1dcfdbf10...
[2] https://hubris.oxide.computer/reference/#_borrow_read_4
Speaking of interesting names, their control plane is called Omicron: https://github.com/oxidecomputer/omicron
We are gettig an increasing amount of interesting Rust operating system for different uses.
- Hubris for deep embedded
- Redox OS for Desktop/Server (https://www.redox-os.org/)
- Tock for embedded (https://www.tockos.org/)
- Xous for trusted devices (https://xobs.io/announcing-xous-the-betrusted-operating-syst...)
I assume there are more.
We also built a Rust framework called FerrOS (https://github.com/auxoncorp/ferros) atop the formally-verified seL4 microkernel.
It has a similar set of usage idioms to Hubris it looks like in terms of trying to setup as much as possible ahead of time to assemble what's kind of an application specific operating system where everything your use case needs is assembled at build-time as a bunch of communicating tasks running on seL4.
We recently added a concise little persistence interface that pulls in TicKV (https://docs.tockos.org/tickv/index.html) from the Tock project you referenced above, and some provisions are being added for some more dynamic task handling based on some asks from an automotive OEM.
Did you try https://github.com/ingydotnet/git-subrepo ? Looks like it vendors in other repositories, making submodules entirely transparent for consumers and still allowing sumbodule workflow for authors.