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/** @file
Copyright (c) 2004 - 2014, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
Module Name:
EfiCpuVersion.c
Abstract:
Provide cpu version extract considering extended family & model ID.
--*/
#include <Library/CpuIA32.h>
/**
Extract CPU detail version infomation
@param FamilyId FamilyId, including ExtendedFamilyId
@param Model Model, including ExtendedModel
@param SteppingId SteppingId
@param 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));
}
}
}
}
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