[src/trunk]: src/sys/arch/amd64 Introduce smap_enable()/smap_disable() functi...

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

details:   https://anonhg.NetBSD.org/src/rev/ae02c8ce3ef8
branches:  trunk
changeset: 946533:ae02c8ce3ef8
user:      bouyer <bouyer%NetBSD.org@localhost>
date:      Mon Nov 30 17:02:27 2020 +0000

description:
Introduce smap_enable()/smap_disable() functions, to be used from
C code.

diffstat:

 sys/arch/amd64/amd64/cpufunc.S   |  12 +++++++++++-
 sys/arch/amd64/include/cpufunc.h |   5 ++++-
 2 files changed, 15 insertions(+), 2 deletions(-)

diffs (37 lines):

diff -r 01f72484d6da -r ae02c8ce3ef8 sys/arch/amd64/amd64/cpufunc.S
--- a/sys/arch/amd64/amd64/cpufunc.S    Mon Nov 30 14:27:23 2020 +0000
+++ b/sys/arch/amd64/amd64/cpufunc.S    Mon Nov 30 17:02:27 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cpufunc.S,v 1.64 2020/07/19 07:35:08 maxv Exp $        */
+/*     $NetBSD: cpufunc.S,v 1.65 2020/11/30 17:02:27 bouyer Exp $      */
 
 /*
  * Copyright (c) 1998, 2007, 2008, 2020 The NetBSD Foundation, Inc.
@@ -167,6 +167,16 @@
 
 STRONG_ALIAS(x86_write_psl,x86_write_flags)
 
+ENTRY(smap_enable)
+       SMAP_ENABLE
+       ret
+END(smap_enable)
+
+ENTRY(smap_disable)
+       SMAP_DISABLE
+       ret
+END(smap_disable)
+
 /*
  * %rdi = name
  * %rsi = sel
diff -r 01f72484d6da -r ae02c8ce3ef8 sys/arch/amd64/include/cpufunc.h
--- a/sys/arch/amd64/include/cpufunc.h  Mon Nov 30 14:27:23 2020 +0000
+++ b/sys/arch/amd64/include/cpufunc.h  Mon Nov 30 17:02:27 2020 +0000
@@ -1,3 +1,6 @@
-/*     $NetBSD: cpufunc.h,v 1.19 2007/10/17 19:53:03 garbled Exp $     */
+/*     $NetBSD: cpufunc.h,v 1.20 2020/11/30 17:02:27 bouyer Exp $      */
 
 #include <x86/cpufunc.h>
+
+void smap_enable(void);
+void smap_disable(void);