audk/Vlv2TbltDevicePkg/PlatformInfoDxe/PlatformInfoDxe.c

/** @file

  Copyright (c) 2004  - 2014, Intel Corporation. All rights reserved.<BR>
                                                                                   
  This program and the accompanying materials are licensed and made available under
  the terms and conditions of the BSD License that 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.    
                                                                                   

Module Name:

  PlatformInfoDxe.c

Abstract:
  Platform Info driver to public platform related HOB data

--*/

#include "PlatformInfoDxe.h"

/**
  Entry point for the driver.

  This routine get the platform HOB data from PEI and publish
  as Platform Info variable that can be accessed during boot service and
  runtime.

  @param ImageHandle    Image Handle.
  @param SystemTable    EFI System Table.

  @retval Status        Function execution status.

**/
EFI_STATUS
EFIAPI
PlatformInfoInit (
  IN EFI_HANDLE                         ImageHandle,
  IN EFI_SYSTEM_TABLE                   *SystemTable
  )
{
  EFI_STATUS                  Status;
  EFI_PLATFORM_INFO_HOB       *PlatformInfoHobPtr;
  EFI_PEI_HOB_POINTERS        GuidHob;
  EFI_PLATFORM_INFO_HOB       TmpHob;
  UINTN                       VarSize;
  EFI_OS_SELECTION_HOB        *OsSlectionHobPtr;
  UINT8                       Selection;
  SYSTEM_CONFIGURATION        SystemConfiguration;
  UINT8                       *LpssDataHobPtr;
  UINT8                       *LpssDataVarPtr;
  UINTN                       i;

  VarSize = sizeof(SYSTEM_CONFIGURATION);
  Status = gRT->GetVariable(
                  NORMAL_SETUP_NAME,
                  &gEfiNormalSetupGuid,
                  NULL,
                  &VarSize,
                  &SystemConfiguration
                  );

  VarSize = sizeof(Selection);
  Status = gRT->GetVariable(
                  L"OsSelection",
                  &gOsSelectionVariableGuid,
                  NULL,
                  &VarSize,
                  &Selection
                  );

  if (EFI_ERROR(Status)) {
    Selection = SystemConfiguration.ReservedO;
    Status = gRT->SetVariable (
                    L"OsSelection",
                    &gOsSelectionVariableGuid,
                    EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE,
                    sizeof(Selection),
                    &Selection
                    );
  }

  GuidHob.Raw = GetHobList ();
  if (GuidHob.Raw != NULL) {
    if ((GuidHob.Raw = GetNextGuidHob (&gOsSelectionVariableGuid, GuidHob.Raw)) != NULL) {
      OsSlectionHobPtr = GET_GUID_HOB_DATA (GuidHob.Guid);

      if (OsSlectionHobPtr->OsSelectionChanged) {
        SystemConfiguration.ReservedO = OsSlectionHobPtr->OsSelection;

        //
        // Load Audio default configuration
        //
        SystemConfiguration.Lpe         = OsSlectionHobPtr->Lpe;
        SystemConfiguration.PchAzalia   = OsSlectionHobPtr->PchAzalia;

        //
        // Load LPSS and SCC default configurations
        //
        LpssDataHobPtr = &OsSlectionHobPtr->LpssData.LpssPciModeEnabled;
        LpssDataVarPtr = &SystemConfiguration.LpssPciModeEnabled;
        for (i = 0; i < sizeof(EFI_PLATFORM_LPSS_DATA); i++) {
          *LpssDataVarPtr = *LpssDataHobPtr;
          LpssDataVarPtr++;
          LpssDataHobPtr++;
        }

        SystemConfiguration.GOPEnable = TRUE;

        Status = gRT->SetVariable (
                        NORMAL_SETUP_NAME,
                        &gEfiNormalSetupGuid,
                        EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE,
                        sizeof(SYSTEM_CONFIGURATION),
                        &SystemConfiguration
                        );
        ASSERT_EFI_ERROR (Status);
      }
    }
  }

  GuidHob.Raw = GetHobList ();
  if (GuidHob.Raw == NULL) {
  	return EFI_NOT_FOUND;
  }

  if ((GuidHob.Raw = GetNextGuidHob (&gEfiPlatformInfoGuid, GuidHob.Raw)) != NULL) {
    PlatformInfoHobPtr = GET_GUID_HOB_DATA (GuidHob.Guid);
    VarSize = sizeof(EFI_PLATFORM_INFO_HOB);
    Status = gRT->GetVariable(
                    L"PlatformInfo",
                    &gEfiVlv2VariableGuid,
                    NULL,
                    &VarSize,
                    &TmpHob
                    );

    if (EFI_ERROR(Status) || CompareMem (&TmpHob, PlatformInfoHobPtr, VarSize)) {

      //
      // Write the Platform Info to volatile memory
      //
      Status = gRT->SetVariable(
                      L"PlatformInfo",
                      &gEfiVlv2VariableGuid,
                      EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE,
                      sizeof(EFI_PLATFORM_INFO_HOB),
                      PlatformInfoHobPtr
                      );
      if (EFI_ERROR(Status)) {
        return Status;
      }
    }
  }

  return EFI_SUCCESS;
}