MdeModulePkg: Minor update to the Data parameter for PEI GetVariable()

[mirror_edk2.git] / MdeModulePkg / Universal / Variable / Pei / Variable.h

diff --git a/MdeModulePkg/Universal/Variable/Pei/Variable.h b/MdeModulePkg/Universal/Variable/Pei/Variable.h
index 580d69fb42c539666c67e4a25f0d8576267c9bff..9e47ccf5ee3de0ffcd1e3bd267add64b593f2333 100644 (file)
--- a/MdeModulePkg/Universal/Variable/Pei/Variable.h
+++ b/MdeModulePkg/Universal/Variable/Pei/Variable.h
@@ -2,7 +2,7 @@
   The internal header file includes the common header files, defines\r
   internal structure and functions used by PeiVariable module.\r
 \r
-Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>\r
+Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>\r
 This program and the accompanying materials\r
 are licensed and made available under the terms and conditions of the BSD License\r
 which accompanies this distribution.  The full text of the license may be found at\r
@@ -87,9 +87,10 @@ PeimInitializeVariableServices (
   @param  DataSize              On entry, points to the size in bytes of the Data buffer.\r
                                 On return, points to the size of the data returned in Data.\r
   @param  Data                  Points to the buffer which will hold the returned variable value.\r
+                                May be NULL with a zero DataSize in order to determine the size of the buffer needed.\r
 \r
   @retval EFI_SUCCESS           The variable was read successfully.\r
-  @retval EFI_NOT_FOUND         The variable could not be found.\r
+  @retval EFI_NOT_FOUND         The variable was not found.\r
   @retval EFI_BUFFER_TOO_SMALL  The DataSize is too small for the resulting data.\r
                                 DataSize is updated with the size required for\r
                                 the specified variable.\r
@@ -105,7 +106,7 @@ PeiGetVariable (
   IN CONST  EFI_GUID                        *VariableGuid,\r
   OUT       UINT32                          *Attributes,\r
   IN OUT    UINTN                           *DataSize,\r
-  OUT       VOID                            *Data\r
+  OUT       VOID                            *Data OPTIONAL\r
   );\r
 \r
 /**\r