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

["Martin Husemann" <martin%netbsd.org@localhost>]

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.