diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
index 202e71990f..fe9b2a5f27 100644
--- a/UefiCpuPkg/UefiCpuPkg.dec
+++ b/UefiCpuPkg/UefiCpuPkg.dec
@@ -37,6 +37,11 @@
   ##  @libraryclass  Provides functions to manage the Local APIC on IA32 and X64 CPUs.
   ##
   LocalApicLib|Include/Library/LocalApicLib.h
+
+  ##  @libraryclass  Provides platform specific initialization functions in the SEC phase.
+  ##
+  PlatformSecLib|Include/Library/PlatformSecLib.h
+
   
 [Guids]
   gUefiCpuPkgTokenSpaceGuid      = { 0xac05bf33, 0x995a, 0x4ed4, { 0xaa, 0xb8, 0xef, 0x7a, 0xe8, 0xf, 0x5c, 0xb0 }}
@@ -62,6 +67,10 @@
   # @Prompt Configure stack size for Application Processor (AP)
   gUefiCpuPkgTokenSpaceGuid.PcdCpuApStackSize|0x8000|UINT32|0x00000003
 
+  ## Specifies stack size in the temporary RAM. 0 means half of TemporaryRamSize.
+  # @Prompt Stack size in the temporary RAM.
+  gUefiCpuPkgTokenSpaceGuid.PcdPeiTemporaryRamStackSize|0|UINT32|0x10001003
+
 [PcdsFixedAtBuild, PcdsPatchableInModule, PcdsDynamic, PcdsDynamicEx]
   ## Specifies timeout value in microseconds for the BSP to detect all APs for the first time.
   # @Prompt Timeout for the BSP to detect all APs for the first time.
diff --git a/UefiCpuPkg/UefiCpuPkg.dsc b/UefiCpuPkg/UefiCpuPkg.dsc
index a4117a2e85..68400e3cf8 100644
--- a/UefiCpuPkg/UefiCpuPkg.dsc
+++ b/UefiCpuPkg/UefiCpuPkg.dsc
@@ -54,8 +54,12 @@
   CpuExceptionHandlerLib|MdeModulePkg/Library/CpuExceptionHandlerLibNull/CpuExceptionHandlerLibNull.inf
   SynchronizationLib|MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf
   SmmMemLib|MdePkg/Library/SmmMemLib/SmmMemLib.inf
+  PeCoffGetEntryPointLib|MdePkg/Library/BasePeCoffGetEntryPointLib/BasePeCoffGetEntryPointLib.inf
+  PeCoffExtraActionLib|MdePkg/Library/BasePeCoffExtraActionLibNull/BasePeCoffExtraActionLibNull.inf
 
-
+[LibraryClasses.common.SEC]
+  PlatformSecLib|UefiCpuPkg/Library/PlatformSecLibNull/PlatformSecLibNull.inf
+  
 [LibraryClasses.common.PEIM]
   MemoryAllocationLib|MdePkg/Library/PeiMemoryAllocationLib/PeiMemoryAllocationLib.inf
   HobLib|MdePkg/Library/PeiHobLib/PeiHobLib.inf
@@ -96,7 +100,9 @@
   UefiCpuPkg/Library/CpuExceptionHandlerLib/SecPeiCpuExceptionHandlerLib.inf
   UefiCpuPkg/Library/CpuExceptionHandlerLib/DxeCpuExceptionHandlerLib.inf
   UefiCpuPkg/Library/CpuExceptionHandlerLib/SmmCpuExceptionHandlerLib.inf
+  UefiCpuPkg/Library/PlatformSecLibNull/PlatformSecLibNull.inf
   UefiCpuPkg/PiSmmCommunication/PiSmmCommunicationPei.inf
   UefiCpuPkg/PiSmmCommunication/PiSmmCommunicationSmm.inf
+  UefiCpuPkg/SecCore/SecCore.inf
   UefiCpuPkg/Universal/Acpi/S3Resume2Pei/S3Resume2Pei.inf
 
diff --git a/UefiCpuPkg/UefiCpuPkg.uni b/UefiCpuPkg/UefiCpuPkg.uni
index 2f2d20f7fd..4fe2faf981 100644
Binary files a/UefiCpuPkg/UefiCpuPkg.uni and b/UefiCpuPkg/UefiCpuPkg.uni differ