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ZealOS
The Zeal Operating System is a modernized fork of the 64-bit Temple Operating System, TempleOS.
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> What would you say that were most important aspects of re-implementing (subset of?) C++ runtime that must be appropriate for in-kernel usage?
Something that I messed up originally and we're now correcting incrementally is the handling of allocation failures. There are many places in a kernel where errors don't have a natural propagation path (IRQ handling for example), so operations that may fail (like allocation) must be avoided.
In general, heavy use of C++ features like templates and RAII has been very helpful for making kernel development productive.
> Where would I look in the source code to learn about SerenityOS paging algorithms, and virtual memory management in general?
You'll find the kernel memory management code in https://github.com/SerenityOS/serenity/tree/master/Kernel/Me...
Quick breakdown:
It's still maintained under the name ZealOS:
https://github.com/Zeal-Operating-System/ZealOS