[src/trunk]: src/sys/arch/x86/include Don't mask out CPUID_FXSR. If not set, ...

[bouyer <bouyer%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/22f2a2914aad
branches:  trunk
changeset: 777731:22f2a2914aad
user:      bouyer <bouyer%NetBSD.org@localhost>
date:      Fri Mar 02 16:41:00 2012 +0000

description:
Don't mask out CPUID_FXSR. If not set, the kernel won't handle SSE and SSE2
registers on context switches; leading to data corruption when running
binaries using these instructions (like e.g. binaries built with a
-mcpu newer than pentium 4, which enables theses instruction in gcc).

diffstat:

 sys/arch/x86/include/specialreg.h |  4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diffs (18 lines):

diff -r 827a189572c2 -r 22f2a2914aad sys/arch/x86/include/specialreg.h
--- a/sys/arch/x86/include/specialreg.h Fri Mar 02 16:39:26 2012 +0000
+++ b/sys/arch/x86/include/specialreg.h Fri Mar 02 16:41:00 2012 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: specialreg.h,v 1.55 2011/12/15 09:38:21 abs Exp $      */
+/*     $NetBSD: specialreg.h,v 1.56 2012/03/02 16:41:00 bouyer Exp $   */
 
 /*-
  * Copyright (c) 1991 The Regents of the University of California.
@@ -307,7 +307,7 @@
 /* Blacklists of CPUID flags - used to mask certain features */
 #ifdef XEN
 /* Not on Xen */
-#define CPUID_FEAT_BLACKLIST    (CPUID_PGE|CPUID_PSE|CPUID_MTRR|CPUID_FXSR)
+#define CPUID_FEAT_BLACKLIST    (CPUID_PGE|CPUID_PSE|CPUID_MTRR)
 #else
 #define CPUID_FEAT_BLACKLIST    0
 #endif /* XEN */