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Kernel: Fix APIC timer calibration to be more accurate
We were calibrating it to 260 instead of 250 ticks per second (being off by one for the 1/10th second calibration time), resulting in ticks of only ~3.6 ms instead of ~4ms. This gets us closer to ~4ms, but because the APIC isn't nearly as precise as e.g. HPET, it will only be a best effort. Then, use the higher precision reference timer to more accurately calculate how many ticks we actually get each second. Also the frequency calculation was off, causing a "Frequency too slow" error with VMware. Fixes some problems observed in #5539
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7 changed files with 64 additions and 23 deletions
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@ -138,4 +138,14 @@ size_t HPETComparator::calculate_nearest_possible_frequency(size_t frequency) co
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return frequency;
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}
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u64 HPETComparator::current_raw() const
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{
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return HPET::the().read_main_counter();
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}
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u64 HPETComparator::raw_to_ns(u64 raw_delta) const
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{
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return HPET::the().raw_counter_ticks_to_ns(raw_delta);
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}
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}
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