UefiCpuPkg/PiSmmCpuDxeSmm: Add PiCpuStandaloneMmEntry for MM

This patch adds the PiCpuStandaloneMmEntry for MM, which is
the module Entry Point of the CPU StandaloneMm driver.

In the Entry Point:
1. Init the mIsStandaloneMm flag
2. Call PiSmmCpuEntryCommon
3. Init SmiCommandPort
4. Install the SMM Configuration Protocol.

Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Dun Tan <dun.tan@intel.com>
Cc: Hongbin1 Zhang <hongbin1.zhang@intel.com>
Cc: Wei6 Xu <wei6.xu@intel.com>
Cc: Yuanhao Xie <yuanhao.xie@intel.com>

UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuStandaloneMm.c

@@ -135,3 +135,49 @@ GetMpInformationFromMpServices (
 
   return NULL;
 }
+
+/**
+  The module Entry Point of the CPU StandaloneMm driver.
+
+  @param  ImageHandle    The firmware allocated handle for the EFI image.
+  @param  SystemTable    A pointer to the MM System Table.
+
+  @retval EFI_SUCCESS    The entry point is executed successfully.
+  @retval Other          Some error occurs when executing this entry point.
+
+**/
+EFI_STATUS
+EFIAPI
+PiCpuStandaloneMmEntry (
+  IN EFI_HANDLE           ImageHandle,
+  IN EFI_MM_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_STATUS  Status;
+
+  Status =  PiSmmCpuEntryCommon ();
+
+  ASSERT_EFI_ERROR (Status);
+
+  if (FeaturePcdGet (PcdCpuSmmProfileEnable)) {
+    //
+    // Get Software SMI
+    //
+    GetSmiCommandPort ();
+  }
+
+  //
+  // Install the SMM Configuration Protocol onto a new handle on the handle database.
+  // The entire SMM Configuration Protocol is allocated from SMRAM, so only a pointer
+  // to an SMRAM address will be present in the handle database
+  //
+  Status = gMmst->MmInstallProtocolInterface (
+                    &gSmmCpuPrivate->SmmCpuHandle,
+                    &gEfiSmmConfigurationProtocolGuid,
+                    EFI_NATIVE_INTERFACE,
+                    &gSmmCpuPrivate->SmmConfiguration
+                    );
+  ASSERT_EFI_ERROR (Status);
+
+  return Status;
+}