/** @file
  Provide Cpu version extract considering extended family & model ID.

  Copyright (c) 2004 - 2016, 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
  which 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.

**/

#include <Library/CpuIA32.h>


/**
  Extract CPU detail version infomation

  @param[in, out] FamilyId         FamilyId, including ExtendedFamilyId
  @param[in, out] Model            Model, including ExtendedModel
  @param[in, out] SteppingId       SteppingId
  @param[in, out] Processor        Processor

**/
VOID
EFIAPI
EfiCpuVersion (
  IN  OUT UINT16  *FamilyId,    OPTIONAL
  IN  OUT UINT8   *Model,       OPTIONAL
  IN  OUT UINT8   *SteppingId,  OPTIONAL
  IN  OUT UINT8   *Processor    OPTIONAL
  )
{
  EFI_CPUID_REGISTER  Register;
  UINT8               TempFamilyId;

  EfiCpuid (EFI_CPUID_VERSION_INFO, &Register);

  if (SteppingId != NULL) {
    *SteppingId = (UINT8) (Register.RegEax & 0xF);
  }

  if (Processor != NULL) {
    *Processor = (UINT8) ((Register.RegEax >> 12) & 0x3);
  }

  if (Model != NULL || FamilyId != NULL) {
    TempFamilyId = (UINT8) ((Register.RegEax >> 8) & 0xF);

    if (Model != NULL) {
      *Model = (UINT8) ((Register.RegEax >> 4) & 0xF);
      if (TempFamilyId == 0x6 || TempFamilyId == 0xF) {
        *Model = (UINT8) (*Model  | ((Register.RegEax >> 12) & 0xF0));
      }
    }

    if (FamilyId != NULL) {
      *FamilyId = TempFamilyId;
      if (TempFamilyId == 0xF) {
        *FamilyId = (UINT8 ) (*FamilyId + (UINT16) ((Register.RegEax >> 20) & 0xFF));
      }
    }
  }
}