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/** @file
This library defines some routines that are generic for IA32 family CPU.
The library routines are UEFI specification compliant.
Copyright (c) 2020, AMD Inc. All rights reserved.<BR>
Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Register/Intel/Cpuid.h>
#include <Register/Amd/Cpuid.h>
#include <Library/BaseLib.h>
#include <Library/UefiCpuLib.h>
/**
Determine if the standard CPU signature is "AuthenticAMD".
@retval TRUE The CPU signature matches.
@retval FALSE The CPU signature does not match.
**/
BOOLEAN
EFIAPI
StandardSignatureIsAuthenticAMD (
VOID
)
{
UINT32 RegEbx;
UINT32 RegEcx;
UINT32 RegEdx;
AsmCpuid (CPUID_SIGNATURE, NULL, &RegEbx, &RegEcx, &RegEdx);
return (RegEbx == CPUID_SIGNATURE_AUTHENTIC_AMD_EBX &&
RegEcx == CPUID_SIGNATURE_AUTHENTIC_AMD_ECX &&
RegEdx == CPUID_SIGNATURE_AUTHENTIC_AMD_EDX);
}
/**
Return the 32bit CPU family and model value.
@return CPUID[01h].EAX with Processor Type and Stepping ID cleared.
**/
UINT32
EFIAPI
GetCpuFamilyModel (
VOID
)
{
CPUID_VERSION_INFO_EAX Eax;
AsmCpuid (CPUID_VERSION_INFO, &Eax.Uint32, NULL, NULL, NULL);
//
// Mask other fields than Family and Model.
//
Eax.Bits.SteppingId = 0;
Eax.Bits.ProcessorType = 0;
Eax.Bits.Reserved1 = 0;
Eax.Bits.Reserved2 = 0;
return Eax.Uint32;
}
/**
Return the CPU stepping ID.
@return CPU stepping ID value in CPUID[01h].EAX.
**/
UINT8
EFIAPI
GetCpuSteppingId (
VOID
)
{
CPUID_VERSION_INFO_EAX Eax;
AsmCpuid (CPUID_VERSION_INFO, &Eax.Uint32, NULL, NULL, NULL);
return (UINT8) Eax.Bits.SteppingId;
}
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