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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Mon, 14 Aug 2017 11:20:54 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r322495 - head/sys/amd64/include
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Author: kib
Date: Mon Aug 14 11:20:54 2017
New Revision: 322495
URL: https://svnweb.freebsd.org/changeset/base/322495

Log:
  Add {rd,wr}{fs,gs}base C wrappers for instructions.
  
  Tested by:	pho (as part of the larger patch)
  Sponsored by:	The FreeBSD Foundation
  MFC after:	1 week

Modified:
  head/sys/amd64/include/cpufunc.h

Modified: head/sys/amd64/include/cpufunc.h
==============================================================================
--- head/sys/amd64/include/cpufunc.h	Mon Aug 14 11:20:10 2017	(r322494)
+++ head/sys/amd64/include/cpufunc.h	Mon Aug 14 11:20:54 2017	(r322495)
@@ -651,6 +651,38 @@ load_gs(u_short sel)
 }
 #endif
 
+static __inline uint64_t
+rdfsbase(void)
+{
+	uint64_t x;
+
+	__asm __volatile("rdfsbase %0" : "=r" (x));
+	return (x);
+}
+
+static __inline void
+wrfsbase(uint64_t x)
+{
+
+	__asm __volatile("wrfsbase %0" : : "r" (x));
+}
+
+static __inline uint64_t
+rdgsbase(void)
+{
+	uint64_t x;
+
+	__asm __volatile("rdgsbase %0" : "=r" (x));
+	return (x);
+}
+
+static __inline void
+wrgsbase(uint64_t x)
+{
+
+	__asm __volatile("wrgsbase %0" : : "r" (x));
+}
+
 static __inline void
 bare_lgdt(struct region_descriptor *addr)
 {