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diff --git a/ArmPlatformPkg/PeilessSec/PeilessSec.h b/ArmPlatformPkg/PeilessSec/PeilessSec.h
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+++ b/ArmPlatformPkg/PeilessSec/PeilessSec.h
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+/** @file
+
+  Copyright (c) 2011 - 2020, Arm Limited. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef PEILESSSEC_H_
+#define PEILESSSEC_H_
+
+#include <PiPei.h>
+
+#include <Library/ArmLib.h>
+#include <Library/ArmPlatformLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/CacheMaintenanceLib.h>
+#include <Library/DebugAgentLib.h>
+#include <Library/DebugLib.h>
+#include <Library/HobLib.h>
+#include <Library/PerformanceLib.h>
+#include <Library/PrePiHobListPointerLib.h>
+#include <Library/PrePiLib.h>
+#include <Library/PrintLib.h>
+#include <Library/SerialPortLib.h>
+#include <Library/TimerLib.h>
+
+#include <Ppi/ArmMpCoreInfo.h>
+#include <Ppi/GuidedSectionExtraction.h>
+#include <Ppi/SecPerformance.h>
+
+extern UINT64  mSystemMemoryEnd;
+
+/**
+  Entrypoint of the memory PEIM driver.
+
+  @param[in]  UefiMemoryBase  The base of the PI/UEFI memory region
+  @param[in[  UefiMemorySize  The size of the PI/UEFI memory region
+
+  @return  Whether the memory PEIM driver executed successfully
+**/
+EFI_STATUS
+EFIAPI
+MemoryPeim (
+  IN EFI_PHYSICAL_ADDRESS  UefiMemoryBase,
+  IN UINT64                UefiMemorySize
+  );
+
+/**
+  Entrypoint of platform PEIM driver.
+
+  @return  Whether the platform PEIM driver executed successfully
+**/
+EFI_STATUS
+EFIAPI
+PlatformPeim (
+  VOID
+  );
+
+/**
+  Populate and install the memory type information HOB.
+**/
+VOID
+BuildMemoryTypeInformationHob (
+  VOID
+  );
+
+/**
+  Architecture specific initialization routine.
+**/
+VOID
+ArchInitialize (
+  VOID
+  );
+
+#endif /* PEILESSSEC_H_ */