Vlv2TbltDevicePkg/Library/CpuIA32Lib/EfiCpuVersion.c

   1 /** @file
   2
   3   Copyright (c) 2004  - 2014, Intel Corporation. All rights reserved.<BR>
   4
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7
   8
   9 Module Name:
  10
  11
  12   EfiCpuVersion.c
  13
  14 Abstract:
  15
  16   Provide cpu version extract considering extended family & model ID.
  17 --*/
  18
  19 #include <Library/CpuIA32.h>
  20
  21 /**
  22   Extract CPU detail version infomation
  23
  24   @param  FamilyId    FamilyId, including ExtendedFamilyId
  25   @param  Model       Model, including ExtendedModel
  26   @param  SteppingId  SteppingId
  27   @param  Processor   Processor
  28
  29 **/
  30 VOID
  31 EFIAPI
  32 EfiCpuVersion (
  33   IN  OUT UINT16  *FamilyId,    OPTIONAL
  34   IN  OUT UINT8   *Model,       OPTIONAL
  35   IN  OUT UINT8   *SteppingId,  OPTIONAL
  36   IN  OUT UINT8   *Processor    OPTIONAL
  37   )
  38
  39 {
  40   EFI_CPUID_REGISTER Register;
  41   UINT8              TempFamilyId;
  42
  43   EfiCpuid (EFI_CPUID_VERSION_INFO, &Register);
  44
  45   if (SteppingId != NULL) {
  46     *SteppingId = (UINT8) (Register.RegEax & 0xF);
  47   }
  48
  49   if (Processor != NULL) {
  50     *Processor = (UINT8) ((Register.RegEax >> 12) & 0x3);
  51   }
  52
  53   if (Model != NULL || FamilyId != NULL) {
  54     TempFamilyId = (UINT8) ((Register.RegEax >> 8) & 0xF);
  55
  56     if (Model != NULL) {
  57       *Model = (UINT8) ((Register.RegEax >> 4) & 0xF);
  58       if (TempFamilyId == 0x6 || TempFamilyId == 0xF) {
  59         *Model = (UINT8) (*Model  | ((Register.RegEax >> 12) & 0xF0));
  60       }
  61     }
  62
  63     if (FamilyId != NULL) {
  64       *FamilyId = TempFamilyId;
  65       if (TempFamilyId == 0xF) {
  66         *FamilyId = (UINT8 ) (*FamilyId + (UINT16) ((Register.RegEax >> 20) & 0xFF));
  67       }
  68     }
  69   }
  70 }