Implement HlClearInterruptFlag() and HlSetInterruptFlag() intrinsic routines

xtoskrnl/hl/amd64/cpufunc.c

@@ -9,6 +9,20 @@
 #include "xtkmapi.h"
 
 
+/**
+ * Instructs the processor to clear the interrupt flag.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTCDECL
+VOID
+HlClearInterruptFlag()
+{
+    asm volatile("cli");
+}
+
 /**
  * Retrieves a various amount of information about the CPU.
  *
@@ -176,6 +190,20 @@ HlReadControlRegister(IN USHORT ControlRegister)
     return Value;
 }
 
+/**
+ * Instructs the processor to set the interrupt flag.
+ *
+ * @return This routine does not return any value.
+ *
+ * @since XT 1.0
+ */
+XTCDECL
+VOID
+HlSetInterruptFlag()
+{
+    asm volatile("sti");
+}
+
 /**
  * Writes a value to the specified CPU control register.
  *