Vlv2TbltDevicePkg/Library/CpuIA32Lib/EfiCpuVersion.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
  17   EfiCpuVersion.c
  18
  19 Abstract:
  20
  21   Provide cpu version extract considering extended family & model ID.
  22 --*/
  23
  24 #include <Library/CpuIA32.h>
  25
  26 /**
  27   Extract CPU detail version infomation
  28
  29   @param  FamilyId    FamilyId, including ExtendedFamilyId
  30   @param  Model       Model, including ExtendedModel
  31   @param  SteppingId  SteppingId
  32   @param  Processor   Processor
  33
  34 **/
  35 VOID
  36 EFIAPI
  37 EfiCpuVersion (
  38   IN  OUT UINT16  *FamilyId,    OPTIONAL
  39   IN  OUT UINT8   *Model,       OPTIONAL
  40   IN  OUT UINT8   *SteppingId,  OPTIONAL
  41   IN  OUT UINT8   *Processor    OPTIONAL
  42   )
  43
  44 {
  45   EFI_CPUID_REGISTER Register;
  46   UINT8              TempFamilyId;
  47
  48   EfiCpuid (EFI_CPUID_VERSION_INFO, &Register);
  49
  50   if (SteppingId != NULL) {
  51     *SteppingId = (UINT8) (Register.RegEax & 0xF);
  52   }
  53
  54   if (Processor != NULL) {
  55     *Processor = (UINT8) ((Register.RegEax >> 12) & 0x3);
  56   }
  57
  58   if (Model != NULL || FamilyId != NULL) {
  59     TempFamilyId = (UINT8) ((Register.RegEax >> 8) & 0xF);
  60
  61     if (Model != NULL) {
  62       *Model = (UINT8) ((Register.RegEax >> 4) & 0xF);
  63       if (TempFamilyId == 0x6 || TempFamilyId == 0xF) {
  64         *Model = (UINT8) (*Model  | ((Register.RegEax >> 12) & 0xF0));
  65       }
  66     }
  67
  68     if (FamilyId != NULL) {
  69       *FamilyId = TempFamilyId;
  70       if (TempFamilyId == 0xF) {
  71         *FamilyId = (UINT8 ) (*FamilyId + (UINT16) ((Register.RegEax >> 20) & 0xFF));
  72       }
  73     }
  74   }
  75 }