diff --git a/org/open_power/Common/Callout.metadata.yaml b/org/open_power/Common/Callout.metadata.yaml
new file mode 100644
index 0000000..00e2067
--- /dev/null
+++ b/org/open_power/Common/Callout.metadata.yaml
@@ -0,0 +1,4 @@
+- name: Procedure
+  meta:
+    - str: "PROCEDURE=%u"
+      type: uint32