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| author | salmonik <salmonik@tuta.io> | 2026-08-01 17:38:57 +0200 |
|---|---|---|
| committer | salmonik <salmonik@tuta.io> | 2026-08-01 17:38:57 +0200 |
| commit | 8f05ea44f69cb796e7b1f581ba1b8045c98d615b (patch) | |
| tree | 3049f0a5fc33dd08f94af0e6493c588b2a4818b9 /.gitmodules | |
| parent | CONTEXT.md: versioning policy (a.b.c — overhaul/feature/fix) (diff) | |
| download | rs-dos-8f05ea44f69cb796e7b1f581ba1b8045c98d615b.tar.gz rs-dos-8f05ea44f69cb796e7b1f581ba1b8045c98d615b.zip | |
rsnix: preemptive kernel tasks (ADR 0003) — sched, IST fault stacks, 176-byte frames
- sched: 16-slot static table, shell=task 0, idle=task 1, spawn with
guard page + 8 KiB stack, RR on the 100 Hz tick, int 0x60 yield,
sleep_ms, lazy reap, jobs/bg/sleep/kill shell commands
- gdt: own GDT mirroring UEFI selectors + TSS with IST1/IST2
(guard-page overflows die gracefully instead of triple-faulting)
- interrupts: isr_dispatch returns next frame in rax; IntFrame grows
rsp/ss fields — QEMU's 64-bit iretq always pops all five slots from
a 176-byte frame, so synthetic task frames must carry rsp=top+ss
(a 160-byte frame made the first iretq pop rsp/ss from the unmapped
page beyond the frame)
- panic handler: task panics abort the task, shell keeps running
- main: sched::init moved after page allocator + adopted tables
(the idle's stack+guard need both; it was silently not spawning)
Diffstat (limited to '')
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