diff --git a/UefiCpuPkg/Include/Library/UefiCpuLib.h b/UefiCpuPkg/Include/Library/UefiCpuLib.h index 5326e72463..092c1d2116 100644 --- a/UefiCpuPkg/Include/Library/UefiCpuLib.h +++ b/UefiCpuPkg/Include/Library/UefiCpuLib.h @@ -4,7 +4,7 @@ This library class defines some routines that are generic for IA32 family CPU to be UEFI specification compliant. - Copyright (c) 2009, Intel Corporation. All rights reserved.
+ Copyright (c) 2009 - 2021, Intel Corporation. All rights reserved.
Copyright (c) 2020, AMD Inc. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent @@ -43,4 +43,25 @@ StandardSignatureIsAuthenticAMD ( VOID ); +/** + Return the 32bit CPU family and model value. + + @return CPUID[01h].EAX with Processor Type and Stepping ID cleared. +**/ +UINT32 +EFIAPI +GetCpuFamilyModel ( + VOID + ); + +/** + Return the CPU stepping ID. + @return CPU stepping ID value in CPUID[01h].EAX. +**/ +UINT8 +EFIAPI +GetCpuSteppingId ( + VOID + ); + #endif diff --git a/UefiCpuPkg/Library/BaseUefiCpuLib/BaseUefiCpuLib.c b/UefiCpuPkg/Library/BaseUefiCpuLib/BaseUefiCpuLib.c index c2cc3ff9a7..50891618c4 100644 --- a/UefiCpuPkg/Library/BaseUefiCpuLib/BaseUefiCpuLib.c +++ b/UefiCpuPkg/Library/BaseUefiCpuLib/BaseUefiCpuLib.c @@ -4,6 +4,7 @@ The library routines are UEFI specification compliant. Copyright (c) 2020, AMD Inc. All rights reserved.
+ Copyright (c) 2021, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent **/ @@ -36,3 +37,45 @@ StandardSignatureIsAuthenticAMD ( 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; +}