1 files changed, 63 insertions, 0 deletions
diff --git a/MdeModulePkg/Include/Protocol/VariableLock.h b/MdeModulePkg/Include/Protocol/VariableLock.h
new file mode 100644
index 0000000000..a2a73bc161
--- /dev/null
+++ b/MdeModulePkg/Include/Protocol/VariableLock.h
@@ -0,0 +1,63 @@
+/** @file
+  Variable Lock Protocol is related to EDK II-specific implementation of variables
+  and intended for use as a means to mark a variable read-only after the event
+  EFI_END_OF_DXE_EVENT_GUID is signaled.
+
+  Copyright (c) 2013, Intel Corporation. All rights reserved.<BR>
+  This program and the accompanying materials                          
+  are licensed and made available under the terms and conditions of the BSD License         
+  which accompanies this distribution.  The full text of the license may be found at        
+  http://opensource.org/licenses/bsd-license.php                                            
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             
+
+**/
+
+#ifndef __VARIABLE_LOCK_H__
+#define __VARIABLE_LOCK_H__
+
+#define EDKII_VARIABLE_LOCK_PROTOCOL_GUID \
+  { \
+    0xcd3d0a05, 0x9e24, 0x437c, { 0xa8, 0x91, 0x1e, 0xe0, 0x53, 0xdb, 0x76, 0x38 } \
+  }
+
+typedef struct _EDKII_VARIABLE_LOCK_PROTOCOL  EDKII_VARIABLE_LOCK_PROTOCOL;
+
+/**
+  Mark a variable that will become read-only after leaving the DXE phase of execution.
+  Write request coming from SMM environment through EFI_SMM_VARIABLE_PROTOCOL is allowed.
+
+  @param[in] This          The EDKII_VARIABLE_LOCK_PROTOCOL instance.
+  @param[in] VariableName  A pointer to the variable name that will be made read-only subsequently.
+  @param[in] VendorGuid    A pointer to the vendor GUID that will be made read-only subsequently.
+
+  @retval EFI_SUCCESS           The variable specified by the VariableName and the VendorGuid was marked
+                                as pending to be read-only.
+  @retval EFI_INVALID_PARAMETER VariableName or VendorGuid is NULL.
+                                Or VariableName is an empty string.
+  @retval EFI_ACCESS_DENIED     EFI_END_OF_DXE_EVENT_GROUP_GUID or EFI_EVENT_GROUP_READY_TO_BOOT has
+                                already been signaled.
+  @retval EFI_OUT_OF_RESOURCES  There is not enough resource to hold the lock request.
+**/
+typedef
+EFI_STATUS
+(EFIAPI * EDKII_VARIABLE_LOCK_PROTOCOL_REQUEST_TO_LOCK) (
+  IN CONST EDKII_VARIABLE_LOCK_PROTOCOL *This,
+  IN       CHAR16                       *VariableName,
+  IN       EFI_GUID                     *VendorGuid
+  );
+
+///
+/// Variable Lock Protocol is related to EDK II-specific implementation of variables
+/// and intended for use as a means to mark a variable read-only after the event
+/// EFI_END_OF_DXE_EVENT_GUID is signaled.
+///
+struct _EDKII_VARIABLE_LOCK_PROTOCOL {
+  EDKII_VARIABLE_LOCK_PROTOCOL_REQUEST_TO_LOCK RequestToLock;
+};
+
+extern EFI_GUID gEdkiiVariableLockProtocolGuid;
+
+#endif  
+