[Bug 240475] [PATCH]: Add support for CPUID 0x16 in tsc_freq_cpuid() (TSC clock)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240475

--- Comment #9 from commit-hook at freebsd.org ---
A commit references this bug:

Author: kib
Date: Wed Sep 25 13:36:56 UTC 2019
New revision: 352684
URL: https://svnweb.freebsd.org/changeset/base/352684

Log:
  x86: Fall back to leaf 0x16 if TSC frequency is obtained by CPUID and
  leaf 0x15 is not functional.

  This should improve automatic TSC frequency determination on
  Skylake/Kabylake/... families, where 0x15 exists but does not provide
  all necessary information.  SDM contains relatively strong wording
  against such uses of 0x16, but Intel does not give us any other way to
  obtain the frequency. Linux did the same in the commit
  604dc9170f2435d27da5039a3efd757dceadc684.

  Based on submission by:       Neel Chauhan <neel at neelc.org>
  PR:   240475
  Reviewed by:  markj
  Sponsored by: The FreeBSD Foundation
  MFC after:    1 week
  Differential revision:        https://reviews.freebsd.org/D21777

Changes:
  head/sys/x86/x86/tsc.c

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