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Author	SHA1	Message	Date
Michael Chang	a03c1034f6	i386: fix TSC calibration using PIT Condition was accidentally reversed, so PIT calibration always failed when PIT was present and always succeeded when PIT was missing, but in the latter case resulted in absurdly fast clock. Reported and tested by Vitaly Kuznetsov <vkuznets@redhat.com>	2015-12-01 18:49:38 +03:00
Vladimir Serbinenko	d43a5ee651	tsc: Use alternative delay sources whenever appropriate. PIT isn't available on some of new hardware including Hyper-V. So use pmtimer for calibration. Moreover pmtimer calibration is faster, so use it on coreboor where booting time is important. Based on patch by Michael Chang.	2015-11-27 11:39:55 +01:00

Author

SHA1

Message

Date

Michael Chang

a03c1034f6

i386: fix TSC calibration using PIT

Condition was accidentally reversed, so PIT calibration always failed
when PIT was present and always succeeded when PIT was missing, but in
the latter case resulted in absurdly fast clock.

Reported and tested by Vitaly Kuznetsov <vkuznets@redhat.com>

2015-12-01 18:49:38 +03:00

Vladimir Serbinenko

d43a5ee651

tsc: Use alternative delay sources whenever appropriate.

PIT isn't available on some of new hardware including Hyper-V. So
use pmtimer for calibration. Moreover pmtimer calibration is faster, so
use it on coreboor where booting time is important.

Based on patch by Michael Chang.

2015-11-27 11:39:55 +01:00

2 commits