UefiCpuPkg/SmmCpuFeaturesLib: Move multi-instance function decl to header

FinishSmmCpuFeaturesInitializeProcessor() is a multi-instance
internal library function that is currently not declared in a
header file but embedded in "SmmCpuFeaturesLib.c".

This change cleans up the declaration moving it to a new header
file "CpuFeaturesLib.h" and removing the local declaration in
"SmmCpuFeaturesLib.c".

Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20210217213227.1277-2-mikuback@linux.microsoft.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
[lersek@redhat.com: replace the guard macro "_CPU_FEATURES_LIB_H_" with
 "CPU_FEATURES_LIB_H_", for fixing ECC 8003, per commit 6ffbb3581ab7]

UefiCpuPkg/Library/SmmCpuFeaturesLib/CpuFeaturesLib.h

@@ -0,0 +1,22 @@
+/** @file
+  Internal library function definitions.
+
+  Copyright (c) Microsoft Corporation.
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef CPU_FEATURES_LIB_H_
+#define CPU_FEATURES_LIB_H_
+
+/**
+  Internal worker function that is called to complete CPU initialization at the
+  end of SmmCpuFeaturesInitializeProcessor().
+
+**/
+VOID
+FinishSmmCpuFeaturesInitializeProcessor (
+  VOID
+  );
+
+#endif

UefiCpuPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.c

@@ -15,6 +15,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 #include <Library/DebugLib.h>
 #include <Register/Intel/Cpuid.h>
 #include <Register/Intel/SmramSaveStateMap.h>
+#include "CpuFeaturesLib.h"
 
 //
 // Machine Specific Registers (MSRs)
@@ -35,16 +36,6 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 #define SMM_FEATURES_LIB_IA32_MCA_CAP              0x17D
 #define   SMM_CODE_ACCESS_CHK_BIT                  BIT58
 
-/**
-  Internal worker function that is called to complete CPU initialization at the
-  end of SmmCpuFeaturesInitializeProcessor().
-
-**/
-VOID
-FinishSmmCpuFeaturesInitializeProcessor (
-  VOID
-  );
-
 //
 // Set default value to assume SMRR is not supported
 //

UefiCpuPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.inf

@@ -17,6 +17,7 @@
   CONSTRUCTOR                    = SmmCpuFeaturesLibConstructor
 
 [Sources]
+  CpuFeaturesLib.h
   SmmCpuFeaturesLib.c
   SmmCpuFeaturesLibNoStm.c
 

UefiCpuPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLibNoStm.c

@@ -9,6 +9,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 
 #include <PiSmm.h>
 #include <Library/SmmCpuFeaturesLib.h>
+#include "CpuFeaturesLib.h"
 
 /**
   Internal worker function that is called to complete CPU initialization at the

UefiCpuPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLibStm.inf

@@ -18,6 +18,7 @@
   CONSTRUCTOR                    = SmmCpuFeaturesLibStmConstructor
 
 [Sources]
+  CpuFeaturesLib.h
   SmmCpuFeaturesLib.c
   SmmStm.c
   SmmStm.h

UefiCpuPkg/Library/SmmCpuFeaturesLib/SmmStm.c

@@ -21,6 +21,7 @@
 
 #include <Protocol/MpService.h>
 
+#include "CpuFeaturesLib.h"
 #include "SmmStm.h"
 
 #define TXT_EVTYPE_BASE                  0x400