[Bug 231291] 12-ALPHA4 does not boot on i386 after r338360

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231291

--- Comment #8 from commit-hook at freebsd.org ---
A commit references this bug:

Author: jhb
Date: Mon Sep 17 17:18:54 UTC 2018
New revision: 338725
URL: https://svnweb.freebsd.org/changeset/base/338725

Log:
  Fix a regression in r338360 when booting an x86 machine without APIC.

  The atpic_register_sources callback tries to avoid registering interrupt
  sources that would collide with an I/O APIC.  However, the previous
  implementation was failing to register IRQs 8-15 since the slave PIC
  saw valid IRQs from the master and assumed an I/O APIC was present.  To
  fix, go back to registering all 8259A interrupt sources in one loop when
  the master's register_sources method is invoked.

  PR:           231291
  Approved by:  re (kib)
  MFC after:    1 month

Changes:
  head/sys/x86/isa/atpic.c

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