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#assembly
3 posts
Technical · 9 min
The first wall
Ring 3, a syscall gate, and the two bits that turn 'the kernel is the only program' into 'the kernel runs code it doesn't trust.' The first time in this project that the hardware, not my kernel's goodwill, holds code back.
Read Technical · 9 min
Multiple things at once, sort of
I gave my from-scratch kernel a timer and its first scheduler. Two tasks take turns on one CPU — first politely, then by force — and the preemption step turned out to be a concurrency trap wearing a simple mechanism's face.
Read Technical · 4 min
Teaching It to Fail Gracefully
Milestone 4 of my from-scratch Rust kernel: the IDT and exception handling — where the machine stops silently rebooting on a mistake and starts telling me what went wrong. The whole thing lives or dies on assembly and Rust agreeing about the shape of the stack.
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