Vlv2TbltDevicePkg/PlatformCpuInfoDxe/PlatformCpuInfoDxe.c

   1 /** @file
   2
   3   Copyright (c) 2004  - 2014, Intel Corporation. All rights reserved.<BR>
   4
   5   This program and the accompanying materials are licensed and made available under
   6   the terms and conditions of the BSD License that accompanies this distribution.
   7   The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php.
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13
  14 Module Name:
  15
  16   PlatformCpuInfoDxe.c
  17
  18 Abstract:
  19   Platform Cpu Info driver to public platform related HOB data
  20
  21 --*/
  22
  23 #include "PlatformCpuInfoDxe.h"
  24
  25 CHAR16    EfiPlatformCpuInfoVariable[] = L"PlatformCpuInfo";
  26
  27 EFI_STATUS
  28 EFIAPI
  29 PlatformCpuInfoInit (
  30   IN EFI_HANDLE                         ImageHandle,
  31   IN EFI_SYSTEM_TABLE                   *SystemTable
  32   )
  33 {
  34   EFI_STATUS                  Status;
  35   EFI_PLATFORM_CPU_INFO       *PlatformCpuInfoPtr;
  36   EFI_PEI_HOB_POINTERS        GuidHob;
  37
  38   //
  39   // Get Platform Cpu Info HOB
  40   //
  41   GuidHob.Raw = GetHobList ();
  42   while ((GuidHob.Raw = GetNextGuidHob (&gEfiPlatformCpuInfoGuid, GuidHob.Raw)) != NULL) {
  43     PlatformCpuInfoPtr = GET_GUID_HOB_DATA (GuidHob.Guid);
  44     GuidHob.Raw = GET_NEXT_HOB (GuidHob);
  45
  46       //
  47       // Write the Platform CPU Info to volatile memory for runtime purposes.
  48       // This must be done in its own driver because SetVariable protocol is dependent on chipset,
  49       // which is dependent on CpuIo, PlatformInfo, and Metronome.
  50       //
  51       Status = gRT->SetVariable(
  52                       EfiPlatformCpuInfoVariable,
  53                       &gEfiVlv2VariableGuid,
  54                       EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
  55                       sizeof(EFI_PLATFORM_CPU_INFO),
  56                       PlatformCpuInfoPtr
  57                       );
  58       if (EFI_ERROR(Status)) {
  59         return Status;
  60       }
  61   }
  62
  63    return EFI_SUCCESS;
  64 }
  65