Fix the ticker frequency

ProjectSerenity / firefly

[WIP] Firefly is a research OS inspired by Linux and Plan 9.

BSD 3-Clause "New" or "Revised" License

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Fix the ticker frequency #7

Closed SlyMarbo closed 3 years ago

SlyMarbo commented 3 years ago

The ticker doesn't seem to be quite right yet. At 512 Hz the uptime counter is slightly too quick, while higher frequencies tick increasingly slowly. Presumably the maths in time::set_ticker_frequency is slightly off, but it seems to emulate both of the following guides correctly:

https://wiki.osdev.org/Programmable_Interval_Timer
http://kernelx.weebly.com/programmable-interval-timer.html

SlyMarbo commented 3 years ago

Closed by the rewrite to Go. May re-emerge later on.