Add stub for System Service Descriptor Table accessor routine

xtoskrnl/ke/sysserv.cc

@@ -0,0 +1,25 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtoskrnl/ke/sysserv.cc
+ * DESCRIPTION:     System Services Descriptor Table
+ * DEVELOPERS:      Aiken Harris <harraiken91@gmail.com>
+ */
+
+#include <xtos.hh>
+
+
+/**
+ * Retrieves a pointer to the System Services Descriptor Table.
+ *
+ * @return This routine returns a pointer to the system services descriptor table.
+ *
+ * @since XT 1.0
+ */
+XTAPI
+PKSERVICE_DESCRIPTOR_TABLE
+KE::SystemServices::GetSystemServicesDescriptorTable(VOID)
+{
+    /* Return NULLPTR as the system services table is not yet implemented */
+    return NULLPTR;
+}