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[HAL:APIC] Fix HalSetTimeIncrement

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Fix calculation of clock rate. Previously it would go above the maximum, causing issues with KeUpdateSystemTime.
This commit is contained in:
Timo Kreuzer
2024-05-02 13:21:13 +03:00
parent e8b88cf879
commit 365c2c1ce3
1 changed files with 6 additions and 5 deletions
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11
hal/halx86/apic/rtctimer.c
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@@ -31,7 +31,7 @@ static BOOLEAN HalpSetClockRate;
static UCHAR HalpNextClockRate;
/*!
\brief Converts the CMOS RTC rate into the time increment in 100ns intervals.
\brief Converts the CMOS RTC rate into the time increment in 0.1ns intervals.
Rate Frequency Interval (ms) Precise increment (0.1ns)
------------------------------------------------------
@@ -222,14 +222,15 @@ NTAPI
HalSetTimeIncrement(IN ULONG Increment)
{
UCHAR Rate;
ULONG CurrentIncrement;
ULONG NextIncrement;
/* Lookup largest value below given Increment */
for (Rate = RtcMinimumClockRate; Rate <= RtcMaximumClockRate; Rate++)
for (Rate = RtcMinimumClockRate; Rate < RtcMaximumClockRate; Rate++)
{
/* Check if this is the largest rate possible */
CurrentIncrement = RtcClockRateToPreciseIncrement(Rate + 1) / 1000;
if (Increment > CurrentIncrement) break;
NextIncrement = RtcClockRateToPreciseIncrement(Rate + 1) / 1000;
if (NextIncrement > Increment)
break;
}
/* Set the rate and tell HAL we want to change it */