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)
{
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