diff --git a/MdePkg/Include/Ipf/SalApi.h b/MdePkg/Include/Ipf/SalApi.h
index cbaf4ac41a..a9520c1b20 100644
--- a/MdePkg/Include/Ipf/SalApi.h
+++ b/MdePkg/Include/Ipf/SalApi.h
@@ -31,6 +31,20 @@ typedef UINTN EFI_SAL_STATUS;
 #define EFI_SAL_NO_INFORMATION        ((EFI_SAL_STATUS) - 5)
 #define EFI_SAL_NOT_ENOUGH_SCRATCH    ((EFI_SAL_STATUS) - 9)
 
+//
+//  Delivery Mode of IPF CPU.
+//
+typedef enum {
+  EFI_DELIVERY_MODE_INT,
+  EFI_DELIVERY_MODE_MPreserved1,
+  EFI_DELIVERY_MODE_PMI,
+  EFI_DELIVERY_MODE_MPreserved2,
+  EFI_DELIVERY_MODE_NMI,
+  EFI_DELIVERY_MODE_INIT,
+  EFI_DELIVERY_MODE_MPreserved3,
+  EFI_DELIVERY_MODE_ExtINT
+} EFI_DELIVERY_MODE;
+
 //
 //  Return values from SAL
 //