edk2/EdkModulePkg/Universal/StatusCode/Dxe/RtMemoryStatusCodeWorker.c

/** @file
  Runtime memory status code worker in DXE.

Copyright (c) 2006, Intel Corporation. All rights reserved. 
This software and associated documentation (if any) is furnished
under a license and may only be used or copied in accordance
with the terms of the license. Except as permitted by such
license, no part of this software or documentation may be
reproduced, stored in a retrieval system, or transmitted in any
form or by any means without the express written consent of
Intel Corporation.

  Module Name:  RtMemoryStatusCodeWorker.c

**/

#include "DxeStatusCode.h"

/**
  Initialize runtime memory status code.
 
  @return  The function always return EFI_SUCCESS

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

  //
  // Allocate runtime memory status code pool.
  //
  RtMemoryStatusCodeTable = 
    (RUNTIME_MEMORY_STATUSCODE_HEADER *) AllocatePool (
                                           sizeof (RUNTIME_MEMORY_STATUSCODE_HEADER) + PcdGet16 (PcdStatusCodeRuntimeMemorySize) * 1024
                                           );

  ASSERT (NULL != RtMemoryStatusCodeTable);

  RtMemoryStatusCodeTable->RecordIndex                  = 0;
  RtMemoryStatusCodeTable->NumberOfRecords              = 0;
  RtMemoryStatusCodeTable->MaxRecordsNumber             = 
    (PcdGet16 (PcdStatusCodeRuntimeMemorySize) * 1024) / sizeof (MEMORY_STATUSCODE_RECORD);

  gDxeStatusCode.RtMemoryStatusCodeTable[PHYSICAL_MODE] = RtMemoryStatusCodeTable;
  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  RtMemoryStatusCodeTable      
                        Point to Runtime memory table header.

  @param  CodeType      Indicates the type of status code being reported.  Type EFI_STATUS_CODE_TYPE is defined in "Related Definitions<6E><73> below.
 
  @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.  For progress codes, the operation is the current activity. 
                        For error codes, it is the exception.  For debug codes, it is not defined at this time. 
                        Type EFI_STATUS_CODE_VALUE is defined in <EFBFBD><EFBFBD>Related Definitions<EFBFBD><EFBFBD> below.  
                        Specific values are discussed in the Intel? Platform Innovation Framework for EFI Status Code Specification.
 
  @param  Instance      The enumeration of a hardware or software entity within the system.  
                        A system may contain multiple entities that match a class/subclass pairing. 
                        The instance differentiates between them.  An instance of 0 indicates that instance information is unavailable, 
                        not meaningful, or not relevant.  Valid instance numbers start with 1.
 
  @return               The function always return EFI_SUCCESS.

**/
EFI_STATUS
RtMemoryStatusCodeReportWorker (
  RUNTIME_MEMORY_STATUSCODE_HEADER      *RtMemoryStatusCodeTable,
  IN EFI_STATUS_CODE_TYPE               CodeType,
  IN EFI_STATUS_CODE_VALUE              Value,
  IN UINT32                             Instance
  )
{
  MEMORY_STATUSCODE_RECORD              *Record;

  ASSERT (NULL != RtMemoryStatusCodeTable);

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

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

  //
  // Record total number of records, we compare the number with max records number,
  // if it is bigger than the max number, then the roll back had happened, the record index points to 
  // the first record. if it is less then max number, then the zero index is the first record.
  //
  RtMemoryStatusCodeTable->NumberOfRecords++;
  if (RtMemoryStatusCodeTable->RecordIndex == RtMemoryStatusCodeTable->MaxRecordsNumber) {
    //
    // Roll back record index.
    //
    RtMemoryStatusCodeTable->RecordIndex = 0;
  }


  return EFI_SUCCESS;
}