eficpuversion.c

来自「EFI BIOS是Intel提出的下一代的BIOS标准。这里上传的Edk源代码是」· C语言 代码 · 共 74 行

/*++

Copyright (c) 2004 - 2006, Intel Corporation                                                         
All rights reserved. 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.             

Module Name:

  EfiCpuVersion.c
  
Abstract:
  
  Provide cpu version extract considering extended family & model ID.
--*/

#include "CpuIA32.h"

VOID
EfiCpuVersion (
  IN  OUT UINT16  *FamilyId,    OPTIONAL
  IN  OUT UINT8   *Model,       OPTIONAL
  IN  OUT UINT8   *SteppingId,  OPTIONAL
  IN  OUT UINT8   *Processor    OPTIONAL
  )
/*++

Routine Description:
  Extract CPU detail version infomation

Arguments:
  FamilyId   - FamilyId, including ExtendedFamilyId
  Model      - Model, including ExtendedModel
  SteppingId - SteppingId
  Processor  - Processor

--*/
{
  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 |= (Register.RegEax >> 12) & 0xF0;
      }
    }
  
    if (FamilyId != NULL) {
      *FamilyId = TempFamilyId;
      if (TempFamilyId == 0xF) {
        *FamilyId = *FamilyId + (UINT16) ((Register.RegEax >> 20) & 0xFF);
      }
    }
  } 
}