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diff --git a/SecurityPkg/Library/TcgStorageOpalLib/TcgStorageOpalLibInternal.h b/SecurityPkg/Library/TcgStorageOpalLib/TcgStorageOpalLibInternal.h
new file mode 100644
index 0000000000..cd16c51c3b
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+++ b/SecurityPkg/Library/TcgStorageOpalLib/TcgStorageOpalLibInternal.h
@@ -0,0 +1,98 @@
+/** @file
+  Internal functions for Opal Core library.
+
+Copyright (c) 2018, 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 _OPAL_INTERNAL_H_
+#define _OPAL_INTERNAL_H_
+
+#include <Library/TcgStorageOpalLib.h>
+
+
+/**
+
+  The function retrieves the MSID from the device specified
+
+  @param[in]  AdminSpSession              OPAL_SESSION with OPAL_UID_ADMIN_SP as OPAL_ADMIN_SP_ANYBODY_AUTHORITY
+  @param[out] ActiveDataRemovalMechanism  Active Data Removal Mechanism that the device will use for Revert/RevertSP calls.
+
+**/
+TCG_RESULT
+EFIAPI
+OpalPyrite2GetActiveDataRemovalMechanism (
+  OPAL_SESSION    *AdminSpSession,
+  UINT8           *ActiveDataRemovalMechanism
+  );
+
+/**
+
+  Get the support attribute info.
+
+  @param[in]      Session             OPAL_SESSION with OPAL_UID_LOCKING_SP to retrieve info.
+  @param[in]      FeatureCode         The feature code user request.
+  @param[in, out] DataSize            The data size.
+  @param[out]     Data                The data buffer used to save the feature descriptor.
+
+**/
+TCG_RESULT
+OpalGetFeatureDescriptor (
+  IN     OPAL_SESSION              *Session,
+  IN     UINT16                    FeatureCode,
+  IN OUT UINTN                     *DataSize,
+  OUT    VOID                      *Data
+  );
+
+/**
+  Get revert timeout value.
+
+  @param[in]      Session                       The session info for one opal device.
+
+**/
+UINT32
+GetRevertTimeOut (
+  IN OPAL_SESSION                *Session
+  );
+
+/**
+
+  Reverts device using Admin SP Revert method.
+
+  @param[in]  AdminSpSession      OPAL_SESSION with OPAL_UID_ADMIN_SP as OPAL_ADMIN_SP_PSID_AUTHORITY to perform PSID revert.
+  @param[in]  EstimateTimeCost    Input the timeout value.
+
+**/
+TCG_RESULT
+OpalPyrite2PsidRevert(
+  OPAL_SESSION              *AdminSpSession,
+  UINT32                    EstimateTimeCost
+  );
+
+/**
+
+  The function calls the Admin SP RevertSP method on the Locking SP.  If KeepUserData is True, then the optional parameter
+  to keep the user Data is set to True, otherwise the optional parameter is not provided.
+
+  @param[in]      LockingSpSession    OPAL_SESSION with OPAL_UID_LOCKING_SP as OPAL_LOCKING_SP_ADMIN1_AUTHORITY to revertSP
+  @param[in]      KeepUserData        Specifies whether or not to keep user Data when performing RevertSP action. True = keeps user Data.
+  @param[in/out]  MethodStatus        Method status of last action performed.  If action succeeded, it should be TCG_METHOD_STATUS_CODE_SUCCESS.
+  @param[in]      EstimateTimeCost    Input the timeout value.
+
+**/
+TCG_RESULT
+OpalPyrite2AdminRevert(
+  OPAL_SESSION    *LockingSpSession,
+  BOOLEAN         KeepUserData,
+  UINT8           *MethodStatus,
+  UINT32          EstimateTimeCost
+  );
+
+#endif // _OPAL_CORE_H_