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Redox OS - an OS built entirely out of Rust
(www.redox-os.org)
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this post was submitted on 21 Dec 2023
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Kinda. Redox uses a microkernel architecture and tries to keep only the most important functionality in ring 0 while they push everything else in userspace. It's great.
So they actually rewrote The Hurd in Rust.
Many lessons were learned from the Hurd that has impacted ALL microkernel kernel and userspace designs, but it is ancient by today's standards.
Its more accurate to say they were "rewriting" MINIX, but I don't like the word "rewriting" as all of these systems are unique in their own way.