MdeModulePkg/Universal/StatusCodeHandler/RuntimeDxe/MemoryStatusCodeWorker.c

/** @file
  Runtime memory status code worker.

  Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
  (C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR>
  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include "StatusCodeHandlerRuntimeDxe.h"

RUNTIME_MEMORY_STATUSCODE_HEADER  *mRtMemoryStatusCodeTable;

/**
  Initialize runtime memory status code table as initialization for runtime memory status code worker

  @retval EFI_SUCCESS  Runtime memory status code table successfully initialized.
  @retval others       Errors from gBS->InstallConfigurationTable().

**/
EFI_STATUS
RtMemoryStatusCodeInitializeWorker (
  VOID
  )
{
  EFI_STATUS                        Status;

  //
  // Allocate runtime memory status code pool.
  //
  mRtMemoryStatusCodeTable = AllocateRuntimePool (
                               sizeof (RUNTIME_MEMORY_STATUSCODE_HEADER) +
                               PcdGet16 (PcdStatusCodeMemorySize) * 1024
                               );
  ASSERT (mRtMemoryStatusCodeTable != NULL);

  mRtMemoryStatusCodeTable->RecordIndex      = 0;
  mRtMemoryStatusCodeTable->NumberOfRecords  = 0;
  mRtMemoryStatusCodeTable->MaxRecordsNumber = 
    (PcdGet16 (PcdStatusCodeMemorySize) * 1024) / sizeof (MEMORY_STATUSCODE_RECORD);
  Status = gBS->InstallConfigurationTable (&gMemoryStatusCodeRecordGuid, mRtMemoryStatusCodeTable);

  return Status;
}


/**
  Report status code into runtime memory. If the runtime pool is full, roll back to the 
  first record and overwrite it.

  @param  CodeType                Indicates the type of status code being reported.
  @param  Value                   Describes the current status of a hardware or software entity.
                                  This included information about the class and subclass that is used to
                                  classify the entity as well as an operation.
  @param  Instance                The enumeration of a hardware or software entity within
                                  the system. Valid instance numbers start with 1.
  @param  CallerId                This optional parameter may be used to identify the caller.
                                  This parameter allows the status code driver to apply different rules to
                                  different callers.
  @param  Data                    This optional parameter may be used to pass additional data.

  @retval EFI_SUCCESS             Status code successfully recorded in runtime memory status code table.

**/
EFI_STATUS
EFIAPI
RtMemoryStatusCodeReportWorker (
  IN EFI_STATUS_CODE_TYPE               CodeType,
  IN EFI_STATUS_CODE_VALUE              Value,
  IN UINT32                             Instance,
  IN EFI_GUID                           *CallerId,
  IN EFI_STATUS_CODE_DATA               *Data OPTIONAL
  )
{
  MEMORY_STATUSCODE_RECORD              *Record;

  //
  // Locate current record buffer.
  //
  Record = (MEMORY_STATUSCODE_RECORD *) (mRtMemoryStatusCodeTable + 1);
  Record = &Record[mRtMemoryStatusCodeTable->RecordIndex++];

  //
  // Save status code.
  //
  Record->CodeType = CodeType;
  Record->Value    = Value;
  Record->Instance = Instance;

  //
  // If record index equals to max record number, then wrap around record index to zero.
  //
  // The reader of status code should compare the number of records with max records number,
  // If it is equal to or larger than the max number, then the wrap-around had happened,
  // so the first record is pointed by record index.
  // If it is less then max number, index of the first record is zero.
  //
  mRtMemoryStatusCodeTable->NumberOfRecords++;
  if (mRtMemoryStatusCodeTable->RecordIndex == mRtMemoryStatusCodeTable->MaxRecordsNumber) {
    //
    // Wrap around record index.
    //
    mRtMemoryStatusCodeTable->RecordIndex = 0;
  }

  return EFI_SUCCESS;
}