Firmware Interface Table

BIOS Specification

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ID 599500
Date 04/14/2023
Intel Confidential

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Document Table of Contents
Document Table of Contents
Legal Firmware Interface Table Introduction Summary of Key Requirements: FIT Pointer Firmware Interface Table
Legal
Firmware Interface Table Introduction
Summary of Key Requirements:
FIT Pointer
FIT Pointer FIT Pointer Rules
FIT Pointer Rules
Firmware Interface Table
Firmware Interface Table FIT Ordering Rules FIT Header (Type 0) Rules Microcode Update (Type 1) Rules Startup ACM (Type 2) Rules Diagnostic ACM (Type 3) Rules BIOS Startup Module (Type 7) Rules TPM Policy Record (Type 8) Rules BIOS Policy Data Record (Type 9) Rules Intel® TXT Policy Data Record (Type 0x0A) Rules Key Manifest Record (Type 0x0B) Rules Boot Policy Manifest (Type 0x0C) Rules Intel® CSE Secure Boot (Type 0x10) Rules Feature Policy Record (Type 0x2D) Rules
FIT Ordering Rules
FIT Header (Type 0) Rules
Microcode Update (Type 1) Rules
Startup ACM (Type 2) Rules
Diagnostic ACM (Type 3) Rules
BIOS Startup Module (Type 7) Rules
TPM Policy Record (Type 8) Rules
BIOS Policy Data Record (Type 9) Rules
Intel® TXT Policy Data Record (Type 0x0A) Rules
Key Manifest Record (Type 0x0B) Rules
Boot Policy Manifest (Type 0x0C) Rules
Intel® CSE Secure Boot (Type 0x10) Rules
Feature Policy Record (Type 0x2D) Rules
Legal
Firmware Interface Table Introduction
Summary of Key Requirements:
FIT Pointer
Firmware Interface Table

FIT Pointer

The processor locates the FIT by following the FIT Pointer, which is located at the fixed address 4 GB - 40h (i.e., 0FFFFFFC0h). The FIT pointer points to the first byte of the Header (type 0) entry in the FIT.

FIT Pointer Rules