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A comment on Snowdrop OS – a homebrew operating system from scratch, in assembly language. Parent comment

Re:Snowdrop OS – a homebrew operating system from scratch, i... by Aaron2222 on Saturday January 25, 2025 @01:33AM (#42819911)
This is something the CHERI architecture[0] (an extension to ARM and RISC-V that implements a capability memory model) can allow this performantly with compiled code (without needing to context switch). This PhD dissertation from Cambridge[1] implements this for C/C++ under CheriBSD (their fork of FreeBSD that supports CHERI).

[0]: https://www.cl.cam.ac.uk/research/security/ctsrd/cheri/

[1]: https://www.cl.cam.ac.uk/techreports/UCAM-CL-TR-949.pdf

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Re:Snowdrop OS – a homebrew operating system from scratch, i... by honestSysAdmin on Saturday January 25, 2025 @03:11PM (#42824396)
illumos on RISC-V with CHERI would be the ultimate. There is another variant of RISC-V that is spectre immune. I have also recently heard of approaches at compile-time, such as RESPECTRE, that remove the spectre problem.
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