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/** @file
Microcode Definitions.
Microcode Definitions based on contents of the
Intel(R) 64 and IA-32 Architectures Software Developer's Manual
Volume 3A, Section 9.11 Microcode Definitions
Copyright (c) 2016 - 2019, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@par Specification Reference:
Intel(R) 64 and IA-32 Architectures Software Developer's Manual, Volume 3A,
June 2016, Chapter 9 Processor Management and Initialization, Section 9-11.
**/
#ifndef __INTEL_MICROCODE_H__
#define __INTEL_MICROCODE_H__
///
/// CPU Microcode Date in BCD format
///
typedef union {
struct {
UINT32 Year : 16;
UINT32 Day : 8;
UINT32 Month : 8;
} Bits;
UINT32 Uint32;
} CPU_MICROCODE_DATE;
///
/// CPU Microcode Processor Signature format
///
typedef union {
struct {
UINT32 Stepping : 4;
UINT32 Model : 4;
UINT32 Family : 4;
UINT32 Type : 2;
UINT32 Reserved1 : 2;
UINT32 ExtendedModel : 4;
UINT32 ExtendedFamily : 8;
UINT32 Reserved2 : 4;
} Bits;
UINT32 Uint32;
} CPU_MICROCODE_PROCESSOR_SIGNATURE;
#pragma pack (1)
///
/// Microcode Update Format definition
///
typedef struct {
///
/// Version number of the update header
///
UINT32 HeaderVersion;
///
/// Unique version number for the update, the basis for the update
/// signature provided by the processor to indicate the current update
/// functioning within the processor. Used by the BIOS to authenticate
/// the update and verify that the processor loads successfully. The
/// value in this field cannot be used for processor stepping identification
/// alone. This is a signed 32-bit number.
///
UINT32 UpdateRevision;
///
/// Date of the update creation in binary format: mmddyyyy (e.g.
/// 07/18/98 is 07181998H).
///
CPU_MICROCODE_DATE Date;
///
/// Extended family, extended model, type, family, model, and stepping
/// of processor that requires this particular update revision (e.g.,
/// 00000650H). Each microcode update is designed specifically for a
/// given extended family, extended model, type, family, model, and
/// stepping of the processor.
/// The BIOS uses the processor signature field in conjunction with the
/// CPUID instruction to determine whether or not an update is
/// appropriate to load on a processor. The information encoded within
/// this field exactly corresponds to the bit representations returned by
/// the CPUID instruction.
///
CPU_MICROCODE_PROCESSOR_SIGNATURE ProcessorSignature;
///
/// Checksum of Update Data and Header. Used to verify the integrity of
/// the update header and data. Checksum is correct when the
/// summation of all the DWORDs (including the extended Processor
/// Signature Table) that comprise the microcode update result in
/// 00000000H.
///
UINT32 Checksum;
///
/// Version number of the loader program needed to correctly load this
/// update. The initial version is 00000001H
///
UINT32 LoaderRevision;
///
/// Platform type information is encoded in the lower 8 bits of this 4-
/// byte field. Each bit represents a particular platform type for a given
/// CPUID. The BIOS uses the processor flags field in conjunction with
/// the platform Id bits in MSR (17H) to determine whether or not an
/// update is appropriate to load on a processor. Multiple bits may be set
/// representing support for multiple platform IDs.
///
UINT32 ProcessorFlags;
///
/// Specifies the size of the encrypted data in bytes, and must be a
/// multiple of DWORDs. If this value is 00000000H, then the microcode
/// update encrypted data is 2000 bytes (or 500 DWORDs).
///
UINT32 DataSize;
///
/// Specifies the total size of the microcode update in bytes. It is the
/// summation of the header size, the encrypted data size and the size of
/// the optional extended signature table. This value is always a multiple
/// of 1024.
///
UINT32 TotalSize;
///
/// Reserved fields for future expansion.
///
UINT8 Reserved[12];
} CPU_MICROCODE_HEADER;
///
/// Extended Signature Table Header Field Definitions
///
typedef struct {
///
/// Specifies the number of extended signature structures (Processor
/// Signature[n], processor flags[n] and checksum[n]) that exist in this
/// microcode update
///
UINT32 ExtendedSignatureCount;
///
/// Checksum of update extended processor signature table. Used to
/// verify the integrity of the extended processor signature table.
/// Checksum is correct when the summation of the DWORDs that
/// comprise the extended processor signature table results in
/// 00000000H.
///
UINT32 ExtendedChecksum;
///
/// Reserved fields.
///
UINT8 Reserved[12];
} CPU_MICROCODE_EXTENDED_TABLE_HEADER;
///
/// Extended Signature Table Field Definitions
///
typedef struct {
///
/// Extended family, extended model, type, family, model, and stepping
/// of processor that requires this particular update revision (e.g.,
/// 00000650H). Each microcode update is designed specifically for a
/// given extended family, extended model, type, family, model, and
/// stepping of the processor.
/// The BIOS uses the processor signature field in conjunction with the
/// CPUID instruction to determine whether or not an update is
/// appropriate to load on a processor. The information encoded within
/// this field exactly corresponds to the bit representations returned by
/// the CPUID instruction.
///
CPU_MICROCODE_PROCESSOR_SIGNATURE ProcessorSignature;
///
/// Platform type information is encoded in the lower 8 bits of this 4-
/// byte field. Each bit represents a particular platform type for a given
/// CPUID. The BIOS uses the processor flags field in conjunction with
/// the platform Id bits in MSR (17H) to determine whether or not an
/// update is appropriate to load on a processor. Multiple bits may be set
/// representing support for multiple platform IDs.
///
UINT32 ProcessorFlag;
///
/// Used by utility software to decompose a microcode update into
/// multiple microcode updates where each of the new updates is
/// constructed without the optional Extended Processor Signature
/// Table.
/// To calculate the Checksum, substitute the Primary Processor
/// Signature entry and the Processor Flags entry with the
/// corresponding Extended Patch entry. Delete the Extended Processor
/// Signature Table entries. The Checksum is correct when the
/// summation of all DWORDs that comprise the created Extended
/// Processor Patch results in 00000000H.
///
UINT32 Checksum;
} CPU_MICROCODE_EXTENDED_TABLE;
#pragma pack ()
#endif
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