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PR/53420 CVS commit: [netbsd-8] src/sys/arch/x86

The following reply was made to PR kern/53420; it has been noted by GNATS.

From: "Martin Husemann" <>
Subject: PR/53420 CVS commit: [netbsd-8] src/sys/arch/x86
Date: Fri, 13 Jul 2018 15:51:28 +0000

 Module Name:	src
 Committed By:	martin
 Date:		Fri Jul 13 15:51:28 UTC 2018
 Modified Files:
 	src/sys/arch/x86/include [netbsd-8]: specialreg.h
 	src/sys/arch/x86/x86 [netbsd-8]: identcpu.c
 Log Message:
 Pull up following revision(s) (requested by maya in ticket #912):
 	sys/arch/x86/x86/identcpu.c: revision 1.79
 	sys/arch/x86/include/specialreg.h: revision 1.127
 Disable MWAIT/MONITOR on Apollo Lake CPUs to workaround APL30 errata.
 We use MWAIT/MONITOR to hatch secondary CPUs. The errata means that
 the wakeup may not happen, so SMP boot fails.
 Use wrmsr to disable it in hardware too, for extra paranoia.
 PR port-amd64/53420,
 also reported on netbsd-users by joern clausen and ssartor.
 To generate a diff of this commit:
 cvs rdiff -u -r1.98.2.5 -r1.98.2.6 src/sys/arch/x86/include/specialreg.h
 cvs rdiff -u -r1.55.2.4 -r1.55.2.5 src/sys/arch/x86/x86/identcpu.c
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

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