MdeModulePkg: StatusCodeHandler: StatusCodeHandler driver in StandaloneMm

This change added support of StandaloneMm for StatusCodeHandler. It
adds a new instance of StatusCodeHandler of MM_STANDALONE type, and
abstracts the driver entrypoint into separate files, replaced gSmst with
gMmst, and switched to MM version of RscHandlerProtocol.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Dandan Bi <dandan.bi@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Jiewen Yao <jiewen.yao@intel.com>

Signed-off-by: Kun Qin <kun.q@outlook.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>

MdeModulePkg/Universal/StatusCodeHandler/Smm/StatusCodeHandlerMm.c

@@ -0,0 +1,79 @@
+/** @file
+  Status Code Handler Driver which produces general handlers and hook them
+  onto the MM status code router.
+
+  Copyright (c) 2009 - 2020, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "StatusCodeHandlerMm.h"
+
+EFI_MM_RSC_HANDLER_PROTOCOL   *mRscHandlerProtocol       = NULL;
+
+
+/**
+  Dispatch initialization request to sub status code devices based on
+  customized feature flags.
+
+**/
+VOID
+InitializationDispatcherWorker (
+  VOID
+  )
+{
+  EFI_STATUS                        Status;
+
+  //
+  // If enable UseSerial, then initialize serial port.
+  // if enable UseRuntimeMemory, then initialize runtime memory status code worker.
+  //
+  if (PcdGetBool (PcdStatusCodeUseSerial)) {
+    //
+    // Call Serial Port Lib API to initialize serial port.
+    //
+    Status = SerialPortInitialize ();
+    ASSERT_EFI_ERROR (Status);
+  }
+  if (PcdGetBool (PcdStatusCodeUseMemory)) {
+    Status = MemoryStatusCodeInitializeWorker ();
+    ASSERT_EFI_ERROR (Status);
+  }
+}
+
+/**
+  Entry point of Common MM Status Code Driver.
+
+  This function is the entry point of MM Status Code Driver.
+
+  @retval EFI_SUCCESS       The entry point is executed successfully.
+
+**/
+EFI_STATUS
+StatusCodeHandlerCommonEntry (
+  VOID
+  )
+{
+  EFI_STATUS                Status;
+
+  Status = gMmst->MmLocateProtocol (
+                    &gEfiMmRscHandlerProtocolGuid,
+                    NULL,
+                    (VOID **) &mRscHandlerProtocol
+                    );
+  ASSERT_EFI_ERROR (Status);
+
+  //
+  // Dispatch initialization request to supported devices
+  //
+  InitializationDispatcherWorker ();
+
+  if (PcdGetBool (PcdStatusCodeUseSerial)) {
+    mRscHandlerProtocol->Register (SerialStatusCodeReportWorker);
+  }
+  if (PcdGetBool (PcdStatusCodeUseMemory)) {
+    mRscHandlerProtocol->Register (MemoryStatusCodeReportWorker);
+  }
+
+  return EFI_SUCCESS;
+}