MdeModulePkg/Universal/StatusCodeHandler/RuntimeDxe/MemoryStatusCodeWorker.c

/** @file
  Runtime memory status code worker.

  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
  (C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#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;
}