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