[PATCH v4 19/20] UefiCpuPkg: CpuIo2Smm: Support of CpuIo driver under StandaloneMm

["Kun Qin" <kun.q@outlook.com>]

This change adds a new CpuIo driver instance for MM_STANDALONE type. The
new driver entrypoint is implemented in a separate file to match the
interface definition of MM_STANDALONE modules.

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: Kun Qin <kun.q@outlook.com>
---

Notes:
    v4:
    - Break SMM instance abstraction and file renaming into a separate
    patch [Ray]
    
    v3:
    - Revert file name change of "CpuIo2Smm" for review and git history
    concern [Laszlo]
    - Break driver entrypoint into separate patch [Laszlo]
    
    v2:
    - Removed "EFIAPI" for internal functions.

 UefiCpuPkg/CpuIo2Smm/CpuIo2StandaloneMm.c   | 32 ++++++++++++++
 UefiCpuPkg/CpuIo2Smm/CpuIo2StandaloneMm.inf | 45 ++++++++++++++++++++
 UefiCpuPkg/UefiCpuPkg.dsc                   |  5 +++
 3 files changed, 82 insertions(+)

diff --git a/UefiCpuPkg/CpuIo2Smm/CpuIo2StandaloneMm.c b/UefiCpuPkg/CpuIo2Smm/CpuIo2StandaloneMm.c
new file mode 100644
index 000000000000..9cff4b7166db
--- /dev/null
+++ b/UefiCpuPkg/CpuIo2Smm/CpuIo2StandaloneMm.c
@@ -0,0 +1,32 @@
+/** @file
+  Produces the SMM CPU I/O Protocol.
+
+Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
+Copyright (c) Microsoft Corporation.
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <PiMm.h>
+
+#include "CpuIo2Mm.h"
+
+/**
+  The module Entry Point for Standalone MM CpuIoProtocol driver
+
+  @param[in] ImageHandle  The firmware allocated handle for the EFI image.
+  @param[in] SystemTable  A pointer to the EFI System Table.
+
+  @retval EFI_SUCCESS  The entry point is executed successfully.
+  @retval Other        Some error occurs when executing this entry point.
+
+**/
+EFI_STATUS
+EFIAPI
+StandaloneMmCpuIo2Initialize (
+  IN EFI_HANDLE           ImageHandle,
+  IN EFI_MM_SYSTEM_TABLE  *SystemTable
+  )
+{
+  return CommonCpuIo2Initialize ();
+}
diff --git a/UefiCpuPkg/CpuIo2Smm/CpuIo2StandaloneMm.inf b/UefiCpuPkg/CpuIo2Smm/CpuIo2StandaloneMm.inf
new file mode 100644
index 000000000000..ec37a9d9198a
--- /dev/null
+++ b/UefiCpuPkg/CpuIo2Smm/CpuIo2StandaloneMm.inf
@@ -0,0 +1,45 @@
+## @file
+#  Produces the SMM CPU I/O 2 Protocol by using the services of the I/O Library.
+#
+#  Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) Microsoft Corporation.
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = CpuIo2StandaloneMm
+  FILE_GUID                      = E3121A26-BB1C-4A18-8E23-2EA3F0412248
+  MODULE_TYPE                    = MM_STANDALONE
+  VERSION_STRING                 = 1.0
+  PI_SPECIFICATION_VERSION       = 0x00010032
+  ENTRY_POINT                    = StandaloneMmCpuIo2Initialize
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64
+#
+
+[Sources]
+  CpuIo2StandaloneMm.c
+  CpuIo2Mm.c
+  CpuIo2Mm.h
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  StandaloneMmDriverEntryPoint
+  BaseLib
+  DebugLib
+  IoLib
+  MmServicesTableLib
+  BaseMemoryLib
+
+[Protocols]
+  gEfiSmmCpuIo2ProtocolGuid                   ## PRODUCES
+
+[Depex]
+  TRUE
diff --git a/UefiCpuPkg/UefiCpuPkg.dsc b/UefiCpuPkg/UefiCpuPkg.dsc
index c3c27afff88e..9128cef076dd 100644
--- a/UefiCpuPkg/UefiCpuPkg.dsc
+++ b/UefiCpuPkg/UefiCpuPkg.dsc
@@ -38,6 +38,7 @@ [LibraryClasses]
   UefiRuntimeServicesTableLib|MdePkg/Library/UefiRuntimeServicesTableLib/UefiRuntimeServicesTableLib.inf
   UefiBootServicesTableLib|MdePkg/Library/UefiBootServicesTableLib/UefiBootServicesTableLib.inf
   UefiDriverEntryPoint|MdePkg/Library/UefiDriverEntryPoint/UefiDriverEntryPoint.inf
+  StandaloneMmDriverEntryPoint|MdePkg/Library/StandaloneMmDriverEntryPoint/StandaloneMmDriverEntryPoint.inf
   DxeServicesTableLib|MdePkg/Library/DxeServicesTableLib/DxeServicesTableLib.inf
   PeimEntryPoint|MdePkg/Library/PeimEntryPoint/PeimEntryPoint.inf
   PeiServicesLib|MdePkg/Library/PeiServicesLib/PeiServicesLib.inf
@@ -96,6 +97,9 @@ [LibraryClasses.common.DXE_SMM_DRIVER]
   HobLib|MdePkg/Library/DxeHobLib/DxeHobLib.inf
   CpuExceptionHandlerLib|UefiCpuPkg/Library/CpuExceptionHandlerLib/SmmCpuExceptionHandlerLib.inf
 
+[LibraryClasses.common.MM_STANDALONE]
+  MmServicesTableLib|MdePkg/Library/StandaloneMmServicesTableLib/StandaloneMmServicesTableLib.inf
+
 [LibraryClasses.common.UEFI_APPLICATION]
   UefiApplicationEntryPoint|MdePkg/Library/UefiApplicationEntryPoint/UefiApplicationEntryPoint.inf
   MemoryAllocationLib|MdePkg/Library/UefiMemoryAllocationLib/UefiMemoryAllocationLib.inf
@@ -126,6 +130,7 @@ [Components.IA32, Components.X64]
       NULL|UefiCpuPkg/Library/CpuCommonFeaturesLib/CpuCommonFeaturesLib.inf
   }
   UefiCpuPkg/CpuIo2Smm/CpuIo2Smm.inf
+  UefiCpuPkg/CpuIo2Smm/CpuIo2StandaloneMm.inf
   UefiCpuPkg/CpuMpPei/CpuMpPei.inf
   UefiCpuPkg/CpuS3DataDxe/CpuS3DataDxe.inf
   UefiCpuPkg/Library/BaseUefiCpuLib/BaseUefiCpuLib.inf
-- 
2.30.0.windows.1