UefiCpuPkg/PiSmmCpuDxeSmm: Move common code into PiSmmCpuCommon.c

Move common code into PiSmmCpuCommon.c to facilitate common usage
in both SMM and MM. The PiSmmCpuCommon.h will be utilized for both
modes in subsequent patches.

No function impact.

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/PiSmmCpuCommon.h

@@ -1490,4 +1490,30 @@ SmmWriteProtectReadOnlyPage (
     } \
   } while (FALSE)
 
+/**
+  Extract NumberOfCpus, MaxNumberOfCpus and EFI_PROCESSOR_INFORMATION for all CPU from gEfiMpServiceProtocolGuid.
+
+  @param[out] NumberOfCpus           Pointer to NumberOfCpus.
+  @param[out] MaxNumberOfCpus        Pointer to MaxNumberOfCpus.
+
+  @retval ProcessorInfo              Pointer to EFI_PROCESSOR_INFORMATION buffer.
+**/
+EFI_PROCESSOR_INFORMATION *
+GetMpInformationFromMpServices (
+  OUT UINTN  *NumberOfCpus,
+  OUT UINTN  *MaxNumberOfCpus
+  );
+
+/**
+  The common Entry Point of the SMM CPU driver.
+
+  @retval EFI_SUCCESS    The common entry point is executed successfully.
+  @retval Other          Some error occurs when executing this entry point.
+
+**/
+EFI_STATUS
+PiSmmCpuEntryCommon (
+  VOID
+  );
+
 #endif

UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf

@@ -30,6 +30,7 @@
 
 [Sources]
   PiSmmCpuDxeSmm.c
+  PiSmmCpuCommon.c
   PiSmmCpuCommon.h
   MpService.c
   SyncTimer.c