CVS commit: src/sys/arch

["Jaromir Dolecek" <jdolecek%netbsd.org@localhost>]

Module Name:    src
Committed By:   jdolecek
Date:           Tue Jun 19 19:50:19 UTC 2018

Modified Files:
        src/sys/arch/x86/include: fpu.h
        src/sys/arch/x86/x86: cpu.c fpu.c identcpu.c
        src/sys/arch/xen/x86: cpu.c

Log Message:
fix FPU initialization on Xen to allow e.g. AVX when supported by hardware;
only use XSAVE when the the CPUID OSXSAVE bit is set, as this seems to be
reliable indication

tested with Xen 4.2.6 DOM0/DOMU on Intel CPU, without and with no-xsave flag,
so should work also on those AMD CPUs, which have XSAVE disabled by default;
also tested with Xen DOM0 4.8.3

fixes PR kern/50332 by Torbjorn Granlund; sorry it took three years to address

XXX pullup netbsd-8


To generate a diff of this commit:
cvs rdiff -u -r1.9 -r1.10 src/sys/arch/x86/include/fpu.h
cvs rdiff -u -r1.155 -r1.156 src/sys/arch/x86/x86/cpu.c
cvs rdiff -u -r1.39 -r1.40 src/sys/arch/x86/x86/fpu.c
cvs rdiff -u -r1.72 -r1.73 src/sys/arch/x86/x86/identcpu.c
cvs rdiff -u -r1.117 -r1.118 src/sys/arch/xen/x86/cpu.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.