audk/IntelFrameworkModulePkg/Universal/StatusCode/RuntimeDxe/RtMemoryStatusCodeWorker.c

/** @file
  Runtime memory status code worker.

  Copyright (c) 2006 - 2009, Intel Corporation                                                         
  All rights reserved. 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 "StatusCodeRuntimeDxe.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.

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

  return EFI_SUCCESS;
}


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

**/
EFI_STATUS
RtMemoryStatusCodeReportWorker (
  IN EFI_STATUS_CODE_TYPE               CodeType,
  IN EFI_STATUS_CODE_VALUE              Value,
  IN UINT32                             Instance
  )
{
  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;
}