[Bug 224437] [PATCH] powerpc64: Fix cookie verification on boot

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224437

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: nwhitehorn
Date: Tue Dec 19 16:45:41 UTC 2017
New revision: 326981
URL: https://svnweb.freebsd.org/changeset/base/326981

Log:
  The highest-order bit of the bootloader cookie is 1, with the result that
  the 32-bit cookie can be sign-extended on its way out of the loader and
  through Open Firmware. If sign-extended, the in-kernel check of its value
  would fail on 64-bit systems, resulting in a mountroot prompt. Solve this
  by telling the kernel to ignore the high-order bits.

  PR:           kern/224437
  Submitted by: Gustavo Romero

Changes:
  head/sys/powerpc/booke/booke_machdep.c
  head/sys/powerpc/powerpc/machdep.c

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