1 files changed, 41 insertions, 0 deletions
diff --git a/EmbeddedPkg/Library/NvVarStoreFormattedLib/NvVarStoreFormattedLib.c b/EmbeddedPkg/Library/NvVarStoreFormattedLib/NvVarStoreFormattedLib.c
new file mode 100644
index 0000000000..001e47cfe8
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+++ b/EmbeddedPkg/Library/NvVarStoreFormattedLib/NvVarStoreFormattedLib.c
@@ -0,0 +1,41 @@
+/** @file
+  A hook-in library for:
+  - MdeModulePkg/Universal/Variable/Pei/VariablePei.inf
+  - MdeModulePkg/Universal/Variable/RuntimeDxe/VariableRuntimeDxe.inf
+  - MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmm.inf
+
+  Plugging this library instance into one of the above modules makes that
+  variable service backend wait for another platform module to dynamically
+  initialize or verify EFI_FIRMWARE_VOLUME_HEADER and VARIABLE_STORE_HEADER in
+  the non-volatile variable store FVB device. The initialization / verification
+  is signaled by installing gEdkiiNvVarStoreFormattedGuid into the
+  phase-matching PPI or protocol database, with a NULL interface. (Note that
+  installing gEdkiiNvVarStoreFormattedGuid into either the DXE or the MM
+  protocol database will unblock VariableSmm -- refer to EFI_SECTION_MM_DEPEX
+  in the PI spec.)
+
+  Copyright (C) 2018, Red Hat, Inc.
+
+  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.
+**/
+
+#include <Base.h>
+
+RETURN_STATUS
+EFIAPI
+NvVarStoreFormattedInitialize (
+  VOID
+  )
+{
+  //
+  // Do nothing, just imbue VariablePei / VariableRuntimeDxe / VariableSmm with
+  // a PPI or protocol dependency on EDKII_NV_VAR_STORE_FORMATTED_GUID.
+  //
+  return RETURN_SUCCESS;
+}