[Bug 196542] System stops booting with "ACPI APIC Table: <INTEL DENLOW>"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196542

--- Comment #25 from commit-hook at freebsd.org ---
A commit references this bug:

Author: jhb
Date: Fri Feb  6 18:20:01 UTC 2015
New revision: 278325
URL: https://svnweb.freebsd.org/changeset/base/278325

Log:
  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.

  PR:        196542
  Differential Revision:    https://reviews.freebsd.org/D1719
  MFC after:    2 weeks

Changes:
  head/sys/amd64/amd64/mp_machdep.c
  head/sys/i386/i386/mp_machdep.c
  head/sys/x86/x86/local_apic.c

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