Beyond BIOS: Developing with the Unified Extensible Firmware Interface

Contents
Acknowledgements
Preface
Chapter 1 – Introduction
	Terminology
	Short History of EFI
	EFI Becomes UEFI—The UEFI Forum
	PIWG and USWG
	Platform Trust/Security
	Embedded Systems: The New Challenge
		How the Boot Process Differs between a Normal Boot and an Optimized/Embedded Boot
	Summary
Chapter 2 – Basic UEFI Architecture
	Objects Managed by UEFI-based Firmware
	UEFI System Table
	Handle Database
	Protocols
		Working with Protocols
		Multiple Protocol Instances
		Tag GUID
	UEFI Images
		Applications
		OS Loader
		Drivers
	Events and Task Priority Levels
	Summary
Chapter 3 – UEFI Driver Model
	Why a Driver Model Prior to OS Booting?
	Driver Initialization
	Host Bus Controllers
	Device Drivers
	Bus Drivers
	Platform Components
	Hot Plug Events
		Pseudo Code
		Device Driver
		Bus Driver that Creates All of Its Child Handles on the First Call to Start()
		Bus Driver that Is Able to Create All or One of Its Child Handles on Each Call to Start():
	Additional Innovations
		Security
		Manageability
		Networking
	Summary
Chapter 4 – Protocols You Should Know
	EFI OS Loaders
	Device Path and Image Information of the OS Loader
	Accessing Files in the Device Path of the OS Loader
	Finding the OS Partition
	Getting the Current System Configuration
	Getting the Current Memory Map
	Getting Environment Variables
	Transitioning to an OS Kernel
	Summary
Chapter 5 – UEFI Runtime
	Isn’t There Only One Kind of Memory?
	How Are Runtime Services Exposed?
	Time Services
		Why Abstract Time?
		Get Time
		Set Time
		Get Wakeup Time
		Set Wakeup Time
	Virtual Memory Services
		Set Virtual Address Map
		ConvertPointer
	Variable Services
		GetVariable
		GetNextVariableName
		SetVariable
	Miscellaneous Services
		Reset System
		Get Next High Monotonic Count
		UpdateCapsule
		QueryCapsuleCapabilities
	Summary
Chapter 6 – UEFI Console Services
	Simple Text Input Protocol
	Simple Text Input Ex Protocol
	Simple Text Output Protocol
	Remote Console Support
	Console Splitter
	Network Consoles
	Summary
Chapter 7 – Different Types of Platforms
	Summary
Chapter 8 – DXE Basics: Core, Dispatching, and Drivers
	DXE Core
		Hand-Off Block (HOB) List
		DXE Architectural Protocols
		EFI System Table
		EFI Boot Services Table
		EFI Runtime Services Table
		DXE Services Table
	Global Coherency Domain Services
		GCD Memory Resources
		GCD I/O Resources
	DXE Dispatcher
		The a priori File
		Dependency Grammar
	DXE Drivers
	Boot Device Selection (BDS) Phase
		Console Devices
		Boot Devices
		Boot Services Terminate
	Summary
Chapter 9 – Some Common UEFI and PI Functions
	Architectural Protocol Examples
		CPU Architectural Protocol
		Real Time Clock Architectural Protocol
		Timer Architectural Protocol
		Reset Architectural Protocol
		Boot Device Selection Architectural Protocol
		Variable Architectural Protocol
		Watchdog Timer Architectural Protocol
	PCI Protocols
		PCI Host Bridge Resource Allocation Protocol
		PCI Root Bridge I/O
		PCI I/O
	Block I/O
	Disk I/O
	Simple File System
		EFI File Protocol
	Configuration Infrastructure
	Using the Configuration Infrastructure
	Driver Model Interactions
	Provisioning the Platform
	Summary
Chapter 10 – Platform Security and Trust
	Trust Overview
	Trusted Platform Module (TPM) and Measured Boot
		What Is a Trusted Building Block (TBB)?
		What Is the Point of Measurements?
	UEFI Secure Boot
		UEFI Executable Verification
	UEFI Networking
	UEFI User Identification (UID)
	Hardware Evolution: SRTM-to-DRTM
	Platform Manufacturer
	Vulnerability Classification
	Roots of Trust/Guards
	Summary
Chapter 11 – Boot Device Selection
	Firmware Boot Manager
		Related Definitions
	Globally-Defined Variables
	Default Behavior for Boot Option Variables
	Boot Mechanisms
		Boot via Simple File Protocol
		Boot via LOAD_FILE Protocol
	Summary
Chapter 12 – Boot Flows
	Defined Boot Modes
	Priority of Boot Paths
	Reset Boot Paths
		Intel® Itanium® Processor Reset
		Non-Power-On Resets
	Normal Boot Paths
		Basic G0-to-S0 and S0 Variation Boot Paths
		S-State Boot Paths
	Recovery Paths
		Discovery
		General Recovery Architecture
	Special Boot Path Topics
		Special Boot Paths
		Special Intel Itanium® Architecture Boot Paths
		Intel Itanium® Architecture Access to the Boot Firmware Volume
	Architectural Boot Mode PPIs
	Recovery
		Discovery
	Summary
Chapter 13 – Pre-EFI Initialization (PEI)
	Scope
	Rationale
		Overview
	Phase Prerequisites
		Temporary RAM
		Boot Firmware Volume
		Security Primitives
	Concepts
		PEI Foundation
		Pre-EFI Initialization Modules (PEIMs)
		PEI Services
		PEIM-to-PEIM Interfaces (PPIs)
		Simple Heap
		Hand-Off Blocks (HOBs)
	Operation
		Dependency Expressions
		Verification/Authentication
		PEIM Execution
		Memory Discovery
		Intel® Itanium® Processor MP Considerations
		Recovery
		S3 Resume
		The “Terse Executable” and Cache-as-RAM
		Example System
	Summary
Chapter 14 – Putting It All Together—Firmware Emulation
	Virtual Platform
		Emulation Firmware Phases
	Hardware Pass-Through
	Summary
Chapter 15 – Reducing Platform Boot Times
	Proof of Concept
	Marketing Requirements
		What Are the Design Goals?
		Platform Policy
		What Are the Supported OS Targets?
		Do We Have to Support Legacy Operating Systems?
		Do We Have to Support Legacy Option ROMs?
		Are We Required to Display an OEM Splash Screen?
		What Type of Boot Media Is Supported?
		What Is the BIOS Recovery/Update Strategy?
		When Processing Things Early
		Is There a Need for Pre-OS User Interaction?
	Additional Details
		Adjusting the BIOS to Avoid Unnecessary Drivers
		What Is the Boot Target?
		Steps Taken in a Normal and Optimized Boot
		Loading a Boot Target
		Organizing the Flash Effectively
		Minimize the Files Needed
	Summary
		The Primary Adjustments
		Suggested Next Steps
Chapter 16 – Embedded Boot Solution
	CE Device Landscape
	CE Device Boot Challenges
	In-Vehicle Infotainment
	Other Embedded Platforms
	Generic Requirements
	Boot Strategies
	Power Management
	Boot Storage Devices
	Security
	Manageability
	Summary
Chapter 17 – Manageability
	Overall Management Framework
		Dynamic In-Band
		Out-of-Band
		Distributed Management Task Force (DMTF)
	UEFI Error Format Standardization
		UEFI Error Format Overview
		Error Record Types
	Windows Hardware Error Architecture and the Role of UEFI
	Technology Intercepts: UEFI, IPMI, Intel® AMT, WS-MAN
		Intelligent Platform Management Interface (IPMI)
		Intel® Active Management Technology (Intel AMT)
		Web Services Management Protocol (WS-MAN)
		Other Industry Initiatives
	The UEFI/IPMI/Intel® AMT/WS-MAN Bridge
		IPMI Error Records to UEFI
		UEFI Error Records to IPMI
		Intel® AMT and IPMI
		Future Work
	Configuration Namespace
		Namespace Entries
		Summary
Appendix A – Data Types
Appendix B – Status Codes
Index