[Bug 197756] System stops booting with "ACPI APIC Table: <SECCSD LH43STAR>"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197756

--- Comment #10 from commit-hook at freebsd.org ---
A commit references this bug:

Author: jhb
Date: Wed Apr 15 16:52:36 UTC 2015
New revision: 281560
URL: https://svnweb.freebsd.org/changeset/base/281560

Log:
  MFC 278325,280866:
  Revert the IPI startup sequence to match what is described in the
  Intel Multiprocessor Specification v1.4.  The Intel SDM claims that

  278325:
  Revert the IPI startup sequence to match what is described in the
  Intel Multiprocessor Specification v1.4.  The Intel SDM claims that
  the INIT IPIs here are invalid, but other systems follow the MP
  spec instead.

  While here, fix the IPI wait routine to accept a timeout in microseconds
  instead of a raw spin count, and don't spin forever during AP startup.
  Instead, panic if a STARTUP IPI is not delivered after 20 us.

  280866:
  Wait 100 microseconds for a local APIC to dispatch each startup-related IPI
  rather than 20.  The MP 1.4 specification states in Appendix B.2:

    "A period of 20 microseconds should be sufficient for IPI dispatch to
     complete under normal operating conditions".

  (Note that this appears to be separate from the 10 millisecond (INIT) and
  200 microsecond (STARTUP) waits after the IPIs are dispatched.)  The
  Intel SDM is silent on this issue as far as I can tell.

  At least some hardware requires 60 microseconds as noted in the PR, so
  bump this to 100 to be on the safe side.

  PR:        196542, 197756

Changes:
_U  stable/10/
  stable/10/sys/amd64/amd64/mp_machdep.c
  stable/10/sys/i386/i386/mp_machdep.c
  stable/10/sys/x86/x86/local_apic.c

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