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diff --git a/sys/amd64/include/cpufunc.h b/sys/amd64/include/cpufunc.h
--- a/sys/amd64/include/cpufunc.h
+++ b/sys/amd64/include/cpufunc.h
@@ -572,6 +572,15 @@
return (sel);
}
+static __inline u_short
+rcs(void)
+{
+ u_short sel;
+
+ __asm __volatile("movw %%cs,%0" : "=rm" (sel));
+ return (sel);
+}
+
static __inline void
load_ds(u_short sel)
{

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