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110 lines
4.6 KiB
C
Executable File
110 lines
4.6 KiB
C
Executable File
/* fit.h
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Copyright (c) 2015, Nikolaj Schlej. All rights reserved.
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHWARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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*/
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#ifndef FIT_H
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#define FIT_H
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#include "basetypes.h"
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#include "ubytearray.h"
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// Make sure we use right packing rules
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#pragma pack(push, 1)
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// Memory address of a pointer to FIT, 40h back from the end of flash chip
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#define FIT_POINTER_OFFSET 0x40
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// Entry types
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#define FIT_TYPE_HEADER 0x00
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#define FIT_TYPE_MICROCODE 0x01
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#define FIT_TYPE_BIOS_AC_MODULE 0x02
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#define FIT_TYPE_BIOS_INIT_MODULE 0x07
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#define FIT_TYPE_TPM_POLICY 0x08
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#define FIT_TYPE_BIOS_POLICY_DATA 0x09
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#define FIT_TYPE_TXT_CONF_POLICY 0x0A
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#define FIT_TYPE_AC_KEY_MANIFEST 0x0B
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#define FIT_TYPE_AC_BOOT_POLICY 0x0C
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#define FIT_TYPE_EMPTY 0x7F
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#define FIT_HEADER_VERSION 0x0100
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#define FIT_MICROCODE_VERSION 0x0100
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const UByteArray FIT_SIGNATURE
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("\x5F\x46\x49\x54\x5F\x20\x20\x20", 8);
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typedef struct FIT_ENTRY_ {
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UINT64 Address;
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UINT32 Size : 24;
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UINT32 : 8;
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UINT16 Version;
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UINT8 Type : 7;
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UINT8 CsFlag : 1;
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UINT8 Checksum;
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} FIT_ENTRY;
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typedef struct {
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UINT16 IndexRegisterAddress;
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UINT16 DataRegisterAddress;
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UINT8 AccessWidth;
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UINT8 BitPosition;
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UINT16 Index;
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} FIT_ENTRY_VERSION_0_CONFIG_POLICY;
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// This scructure is described in Section 9.11.1 of the Intel Software Developer manual Volume 3A Part 1
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typedef struct INTEL_MICROCODE_HEADER_ {
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UINT32 HeaderVersion; // 0x00000001
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UINT32 UpdateRevision;
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UINT16 DateYear; // BCD
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UINT8 DateDay; // BCD
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UINT8 DateMonth; // BCD
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UINT32 ProcessorSignature;
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UINT32 Checksum; // Checksum of Update Data and Header. Used to verify the integrity of the update header and data.
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// Checksum is correct when the summation of all the DWORDs (including the extended Processor Signature Table)
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// that comprise the microcode update result in 00000000H.
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UINT32 LoaderRevision; // 0x00000001
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UINT8 ProcessorFlags;
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UINT8 ProcessorFlagsReserved[3]; // Zeroes
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UINT32 DataSize; // Specifies the size of the encrypted data in bytes, and must be a multiple of DWORDs.
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// If this value is 00000000H, then the microcode update encrypted data is 2000 bytes (or 500 DWORDs).
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// Sane values are less than 0x1000000
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UINT32 TotalSize; // Specifies the total size of the microcode update in bytes.
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// It is the summation of the header size, the encrypted data size and the size of the optional extended signature table.
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// This value is always a multiple of 1024 according to the spec, but Intel already breached it several times.
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// Sane values are less than 0x1000000
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UINT8 Reserved[12]; // Zeroes
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} INTEL_MICROCODE_HEADER;
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#define INTEL_MICROCODE_REAL_DATA_SIZE_ON_ZERO 2000
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typedef struct INTEL_MICROCODE_EXTENDED_HEADER_ {
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UINT32 EntryCount;
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UINT32 Checksum; // Checksum of extended processor signature table.
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// Used to verify the integrity of the extended processor signature table.
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// Checksum is correct when the summation of the DWORDs that comprise the extended processor signature table results in 00000000H.
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UINT8 Reserved[12];
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// INTEL_MICROCODE_EXTENDED_HEADER_ENTRY Entries[EntryCount];
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} INTEL_MICROCODE_EXTENDED_HEADER;
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typedef struct INTEL_MICROCODE_EXTENDED_HEADER_ENTRY_ {
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UINT32 ProcessorSignature;
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UINT32 ProcessorFlags;
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UINT32 Checksum; // To calculate the Checksum, substitute the Primary Processor Signature entry and the Processor Flags entry with the corresponding Extended Patch entry.
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// Delete the Extended Processor Signature Table entries.
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// Checksum is correct when the summation of all DWORDs that comprise the created Extended Processor Patch results in 00000000H.
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} INTEL_MICROCODE_EXTENDED_HEADER_ENTRY;
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#define INTEL_MICROCODE_HEADER_VERSION_1 0x00000001
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#pragma pack(pop)
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#endif // FIT_H
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