uefi overview unified extensible firmware interface (uefi) framework uefi overview intel...
TRANSCRIPT
![Page 1: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/1.jpg)
Unified Extensible Firmware Interface (UEFI) Framework
UEFI Overview
Intel SSG/SSD/UEFI
![Page 2: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/2.jpg)
Legal DisclaimerINFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL PRODUCTS. NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. EXCEPT AS PROVIDED IN INTEL'S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, INTEL ASSUMES NO LIABILITY WHATSOEVER AND INTEL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY, RELATING TO SALE AND/OR USE OF INTEL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS OTHERWISE AGREED IN WRITING BY INTEL, THE INTEL PRODUCTS ARE NOT DESIGNED NOR INTENDED FOR ANY APPLICATION IN WHICH THE FAILURE OF THE INTEL PRODUCT COULD CREATE A SITUATION WHERE PERSONAL INJURY OR DEATH MAY OCCUR.
Intel may make changes to specifications and product descriptions at any time, without notice. Designers must not rely on the absence or characteristics of any features or instructions marked "reserved" or "undefined." Intel reserves these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them. The information here is subject to change without notice. Do not finalize a design with this information.
The products described in this document may contain design defects or errors known as errata which may cause the product to deviate from published specifications. Current characterized errata are available on request.
Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order.
Copies of documents which have an order number and are referenced in this document, or other Intel literature, may be obtained by calling 1-800-548-4725, or go to: http://www.intel.com/design/literature.htm
This document contains information on products in the design phase of development.
All products, computer systems, dates, and figures specified are preliminary based on current expectations, and are subject to change without notice.
Intel, Intel Atom, Intel Core, and the Intel logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States and other countries.
* Other names and brands may be claimed as the property of others.
Copyright © 2011, Intel Corporation. All rights reserved.
BLDK PRC Training 2011
![Page 3: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/3.jpg)
Agenda
BIOS Background
UEFI Overview
Platform Initialization (PI) Overview
![Page 4: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/4.jpg)
What’s Legacy BIOS• Basic Input - Output System for original IBM PC/XT and PC/AT• Originated in 1980s• Based on 8086 architecture• A group of clearly defined OS-independent interface for
hardware Int10 for Video service Int13 disk service Int16 keyboard service Int18 BIOS ROM loader Int19 bootstrap loader
• Availability of MS-DOS outside of IBM allowed applications to run equally
well across different brands of box "PC clones".
BIOS background
![Page 5: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/5.jpg)
EFI / UEFI History Timeline
200520001995 19901985
PCI Spec
Sp
ecifi
cati
on
sIm
ple
men
tati
on IBM 16 Bit
BIOS
Intel® Itanium® Platforms 64 bit develops
Intel® Itanium® Platforms 64 bit develops
EFI only way to boot Itanium® Platforms
EFI 1.02EFI
1.02
EFI DevKit(EDK)
Tianocore.org Open Source
EFI Sample Implementation 1.10.14.6x
Open Source EFI Developer Kit (EDK) http://www.tianocore.Sourceforge.netUEFI Specifications - http://www.uefi.org
PC Era1980s
framework1 0.9 Spec
framework1 0.9 Spec
EFI 1.10EFI
1.10
BIOS background
![Page 6: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/6.jpg)
UEFI Specification Timeline
201020092008 20072006
UEFI 2.0
PI 1.0
UEFI 2.1
PI 1.1
UEFI 2.3UEFI 2.2
EDK 1.01: UEFI 2.0
Shell 2.0
PI 1.2
Packaging 1.0
SCT UEFI 2.1
EDK 1.04: UEFI 2.1PI 1.0
Sp
ecifi
cati
on
sIm
ple
men
tati
on
http://uefi.org
Open Source
EDK 1.05: UEFI 2.1+PI 1.0
SCTPI 1.0
SCT UEFI 2.0
EDK II: UEFI 2.3+PI 1.2+
All products, dates, and programs are based on current expectations and subject to change without notice.
EDK II: UEFI 2.1+PI 1.0
BIOS background
UDK2010
![Page 7: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/7.jpg)
Agenda
BIOS Background
UEFI Overview
Platform Initialization (PI) Overview
![Page 8: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/8.jpg)
What is UEFI?
• Unified (EFI) / Extensible Firmware Interface (EFI)• UEFI is an interface specification• Abstracts BIOS from OS
–Decouples development• Compatible by design
–Evolution, not revolution• Modular and extensible
–OS-Neutral value add• Provide efficient Option ROM Replacement
–Common source for multiple CPU architectures• Complements existing interfaces
OSLoader
Hardware
BIOS
UEFI
Com
pati
bilit
y
*
UEFI Overview
![Page 9: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/9.jpg)
PLATFORM HARDWARE
PLATFORM SPECIFIC FIRMWARE
UEFI BOOT SERVICES UEFIRUNTIMESERVICES
UEFI OS LOADER
(OTHER)SMBIOS
ACPI
INTERFACESFROMOTHERREQUIREDSPECS
Mem
ory
Timer
DriverDriverUEFI or
PIDrivers
BootDevices
Protocols +Handlers
OPERATING SYSTEM
Legacy OS LOADER
Compatibility
UEFI API
MotherboardROM/FLASH Option
ROMOptionROM
OptionROM
UEFI Drivers UEFIDrivers UEFI OS
Loader
UEFI SYSTEMPARTITION
UEFIDrivers
OS PARTITION
Concept
*
UEFI Overview
![Page 10: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/10.jpg)
Unified EFI (UEFI) Forum – www.uefi.org
• Promoters– OEMs: Dell, HP, IBM, Lenovo– IBVs: AMI, Insyde, Phoenix– AMD, Apple, Intel, Microsoft
• UEFI Specification– EFI 1.10 specification contributed to the Forum by Intel and Microsoft
to be used as a starting draft– UEFI 2.0 - 2.3 specification released.– Forum will evolve, extend, and add any new functionality as required – Intel contributed EFI 1.10 SCT being used as starting base for UEFI
conformance tests (UEFI SCT 2.1 released 2008)
*
Purpose: Worldwide adoption and promotion of UEFI specifications.
UEFI Overview
![Page 11: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/11.jpg)
UEFI Membership
• Any entity wanting to implement the specification
Adopters:
• Corporations, groups or individuals wanting to participate in UEFI• Chance to join work groups and contribute to spec or test development• Early access to drafts and work in progress
Contributors:
• Board and Corporate Officers
Promoters:
UEFI Overview
![Page 12: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/12.jpg)
Boot device support
• Hard disk• Removable media– CD-ROM, DVD-ROM
• El Torito 1.0 “No emulation”
– Floppy, USB Storage, etc.• Network– PXE BIOS support specification (Wire for Management)– iSCSI
• Future media via extensibility methods
Full Device Support
Boot Support
![Page 13: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/13.jpg)
PartitionTable H
DR Partition 1
MBR
PartitionTable H
DR
0 1 n...
LBA0 LBA1 LBAn
Start partition
End partitionStart partition
Primary PartitionTable
Backup PartitionTable
0 1 n...
End partition
First useable block
Last useable block
See Section-5 UEFI 2.X Spec.
New Partition StructureBoot Support
![Page 14: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/14.jpg)
GPT Advantages over MBR Partition Table
• 64-bit Logical Block Addressing.• Supports unlimited number of partitions• Uses a primary and backup table for redundancy.• Uses version number and size fields for future expansion.• Uses CRC32 fields for improved data integrity.• Defines a GUID for uniquely identifying each partition.• Uses a GUID and attributes to define partition content type.• Each partition contains a 36 Unicode character human
readable name.• No magic code must execute as part of booting• Fixes the 2.2 Terabyte Problem
Boot Support
![Page 15: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/15.jpg)
UEFI Specification - Key Concepts
• Objects - manage system state, including I/O devices, memory, and events
• The UEFI System Table - data structure with data in-formation tables to interface with the systems
• Handle database and protocols - callable interfaces that are registered
• UEFI images - the executable content format • Events - the software can be signaled in response to
some other activity • Device paths - a data structure that describes the
hardware location of an entity
UEFI Terminology
![Page 16: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/16.jpg)
UEFI Data Structures - UEFI System TableEFI System
Table
EFI Runtime Services TableVariable Services
Real Time Clock ServicesReset Services
Status Code ServicesVirtual Memory ServicesEFI Boot Services Table
Task Priority Level ServicesMemory Services
Event and Timer ServicesProtocol Handler Services
Image ServicesDriver Support Services
Input ConsoleActive Consoles
Output ConsoleStandard Error Console
Version InformationEFI Specification Version
Firmware VendorFirmware Revision
Handle Database Protocol InterfaceProtocol InterfaceProtocol InterfaceProtocol InterfaceProtocol InterfaceProtocol Interface
Boot Service Data Structures Runtime Data Structures
UEFI Terminology
![Page 17: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/17.jpg)
GUID
• “Globally” Unique Identity–128-bit quantity defined by Wired for Management
WfM 2.0 specification **• Used to identify protocols–1:1 with interfaces
• Regulate extension mechanism–Documented in the spec–Added through drivers
Safe co-existence of 3rd party extensions** http://www.intel.com/design/archives/wfm/index.htm
UEFI Terminology
![Page 18: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/18.jpg)
Legacy BIOS vs UEFI
• UEFI• GUID1 UEFI Specification • GUID2 PI Specification• GUID3 ODM defined• GUID4 OEM defined• GUID5 IBV defined
Legacy BIOSINT 10hINT 13h
Chaining INT 16hINT 15h
?
Ralf Brown’s Interrupt List
GUID1GUID2 GUID3
GUID4
GUID5
UEFI
UEFI Means the Pieces all Fit and Work!
![Page 19: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/19.jpg)
Handles
• All protocols have a handle which is associated with the protocol• Every device and executable image in UEFI has
a handle protocol in the handle database• Every boot device must have a device path
protocol to describe it
UEFI Terminology
![Page 20: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/20.jpg)
Protocols (API)
GUID, Interface Structure, Services DEVICE_PATH, DEVICE_IO, BLOCK_IO, DISK_IO, FILE_SYSTEM,
SIMPLE_INPUT, SIMPLE_TEXT_OUTPUT, SERIAL_IO, PXE_BC, SIMPLE_NETWORK, LOAD_FILE, UNICODE_COLLATION
Handle
Function Ptr 1
Private Data
GUID
Function Ptr 2
. . .
Protocol Interface GUID 1
GUID 2
Function 1
Function 2
Access Device
orServices
Produced by Other UEFI
Drivers
BlkIo->ReadBlocks(BlkIo, …)
. . .
. . .
UEFI Terminology
![Page 21: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/21.jpg)
Handle Protocol Database
...
Handle
First Handle
GUID GUID
ProtocolInterface
InstanceData
ProtocolInterface
InstanceData
Handle
GUID
ProtocolInterface
InstanceData
Image HandleController HandleAttributes
...
Image HandleController HandleAttributes
Image HandleController HandleAttributes
Image HandleController HandleAttributes
Image HandleController HandleAttributes
...
GUID
ProtocolInterface
InstanceData
UEFI Terminology
![Page 22: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/22.jpg)
Device Path Protocol
• A data structure description of where a device is in the platform
• All boot devices, logical devices and images must be described by a device path
• 6 types of device paths:–Hardware–ACPI – UID/HID of device in AML–Messaging – i.e. LAN, Fiber Channel, ATAPI, SCSI, USB–Media – i.e. Hard Drive, Floppy or CD-ROM–EDD 3.0 boot device – see EDD 3.0 spec int13 48–End of hardware – marks end of device pathSee Section-9 UEFI 2.X Spec.
UEFI Terminology
![Page 23: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/23.jpg)
Acpi(PNP0A03,0) /Pci(1F|1) /Ata(Primary,Master) /HD(Part3, Sig010…) \EFI\Boot”/”OSLoader.efi”
An UEFI Device Path describes a boot target. Binary description of the physical location of a
specific target.
Why UEFI Device Path ? –
Acpi(PNP0A03,0) Acpi(PNP0A03,0) /Pci(1F|1) Acpi(PNP0A03,0) /Pci(1F|1) /Ata(Primary,Master)Acpi(PNP0A03,0) /Pci(1F|1) /Ata(Primary,Master) /HD(Part3, Sig010…) Acpi(PNP0A03,0) /Pci(1F|1) /Ata(Primary,Master) /HD(Part3, Sig010…) \EFI\Boot”/”OSLoader.efi”
Initialize PCI root Bridge
Initialize PCI Device
Initialize ATADevice
Initialize the Partition Driver
Initialize File System Driver
Launch O/SLoader
Connect PCI Root Bridge & Install OP ROM
Connect Consoles
Diagnostics/Shell
Boot
*
Boot
Seq
uenc
eUEFI Terminology
Note: Boot Sequence is part of the PI Spec.
![Page 24: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/24.jpg)
• Events and notifications– Polled devices, no
interrupts• Watchdog timer
– Elegant recovery• Memory allocation• Handle location – for
finding protocols• Image loading
– Drivers, applications, OS loader
RT Services are Minimal set to meet OSV needs
• Timer, Wakeup alarm– Allows system to wake up or
power on at a set time.
• Variables– Boot manager handshake
• System reset
Boot Services Runtime ServicesAvailable at both Boot time and Runtime
*
ExitB
ootS
ervi
ces(
)
UEFI Aware OS
![Page 25: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/25.jpg)
Typical System
CPU
PCI HostBus
USB
IDE
PCI-ISABridge
VGA
Keyboard
Mouse
FloppyDrive
HardDrive
CD-ROM
PCI Bus
USB Bus
ISA Bus
IDE Bus
Device ControllerBus Controller Other
ISAFDC
PCI-PCMCIA
See Section-2.5 UEFI 2.X Spec.
UEFI Driver Design
![Page 26: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/26.jpg)
Driver Initialization
• UEFI Driver Handoff State• Not Allowed to Touch Hardware Resources• Installs Driver Binding on Driver Image Handle
Installed in Driver InitializationImplemented by Driver Writer
Created by LoadImage()Driver Image Handle
EFI_DRIVER_BINDING
Registers Driver for Later Use
EFI_COMPONENT_NAME
UEFI Driver Design
![Page 27: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/27.jpg)
Driver Binding Protocol
Driver Image Handle
LOADED_IMAGE
DRIVER_BINDINGDRIVER_BINDING Supported() Start() Stop() Version
*
UEFI Driver Design
![Page 28: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/28.jpg)
IDE ATAPI disk drive
Block IOProtocol
Device PathProtocol
Disk IOProtocol
File SystemProtocol(FAT)
HD Handle
UEFI ATAPIDriver
Han
dle
Pro
toco
l()
ATAPI Device PathACPI(pnp0604,0)/PCI(0,1)/ ATA(primary, master)
UEF
I sy
stem
parti
tion
UEF
I boo
t ser
vice
s
Image Handle
Device PathProtocol
Example: UEFI ATAPI Driver StackUEFI Driver Design
![Page 29: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/29.jpg)
Agenda
BIOS Background
UEFI Overview
Platform Initialization (PI) Overview
![Page 30: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/30.jpg)
Technology not addressed by UEFI
• Memory Initialization• Recovery • FLASH update• ACPI S3 • Platform Initialization• System Management Mode (SMM)• Setup
UEFI Separates BIOS and OS
Technology not addressed by UEFI
![Page 31: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/31.jpg)
USWG/PIWG Relationship
• UEFI Spec is about interfaces between OS, add-in driver and system firmware– a new model for the interface
between the Operating systems and other high-level software and the platform firmware
• PI Specs relate to making UEFI implementations– Promote interoperability between
firmware components providers– Modular components like silicon
drivers (e.g. PCI) and value-add drivers (security)
Platf
orm
Initi
aliza
tion
PI Modular components
Hardware
UEFI-enabled
OS
Pre-bootTools Legacy
OS
OptionROMs
CPU PEIModules
C/S PEI Modules
UEFI
• • •
UEFI D
riverDXE D
river
Compatibility
Support M
odule
UEFI D
river
BDS
UEFI D
river
UEFI and PI are Independent Interfaces
UEFI and PI Specifications
![Page 32: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/32.jpg)
OEM
x/OD
M y
Drivers
PI D
rivers
Compatibility
Support Module
A
IBV z D
rivers
Architectural Protocols
Foundations
Hardware
EFI-enabled
OS
Pre-bootTools
Today’sOS
OptionROMs
Intel® Platform Innovation Framework for UEFI and Platform Initialization (PI)
• Base Core Foundation (“Green H”)• Foundation lets different teams
share code• Developers can easily move between
projects• Chipset code enabled by Silicon
vendor• Standardization benefits the industry• IBV provides value add• Glue code “Big H” is Open Source on
www.tianocore.org • The framework1 Start point for
Platform Initialization (PI) Specification on www.UEFI.org
UEFI
IBV x D
rivers
Compatibility
Support Module
B
MRC - CPU
1Intel® Platform Innovation Framework for UEFI
Technology not addressed by UEFI
![Page 33: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/33.jpg)
Intel® Platform Innovation Framework for UEFI and Platform Initialization (PI) Overview
Specification time line
2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
framework1 0.9 Spec
framework1 0.9 Spec
EFI 1.10EFI
1.10
UEFI 2.0
PI 1.0
UEFI 2.1
PI 1.1
UEFI 2.3UEFI 2.2
PI 1.2
Packaging 1.0
Shell 2.0
EFI 1.02EFI
1.02
1Intel® Platform Innovation Framework for UEFI
Why PI
![Page 34: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/34.jpg)
The framework1 and PI Design Strategy
• High level design based on the framework1 plus modular components
• Generalize the framework1 Maximize reuse of infrastructure– High degree of independence from platform and
market segment specifics• Specifics encapsulated in the drivers– Drivers map to software visible hardware– Isolate hardware/platform specifics to support
component-based firmware construction
Design Approach
1Intel® Platform Innovation Framework for UEFI
![Page 35: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/35.jpg)
Get to “C” Code Quickly• Commercial “C” compilers use stack model– Requires some memory initialized for a stack
• Split the framework1 and PI infrastructure in two– Pre-EFI Initialization (PEI), preamble to get
memory– Driver Execution Environment (DXE),
infrastructure to support “C” coded EFI drivers• First part of the framework1 / PI finds memory by using special stack– Infrastructure code plus PEI Modules
• The framework1 / PI uses modules for CPU, chipset and board– Minimum initialization to get memory working
• Architecture only requires “enough” memory– PEI limited so defer to rich DXE “C” environment
Standard tools Flexible memory initialization
Design Approach
![Page 36: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/36.jpg)
Architecture Execution Flow
Pre EFIInitialization (PEI)
Driver Execution Environment
(DXE)
Boot DevSelect(BDS)
Transient System Load
(TSL)
After Life(AL)
Power on [ . . Platform initialization . . ] [ . . . . OS boot . . . . ] Shutdown
Run Time(RT)
?
OS-PresentApp
Final OS Environment
Final OS Boot Loader
OS-AbsentApp
Transient OS Environment
Transient OS Boot Loader
Boot Manager
CPUInit
Chipset Init
Board Init
verif
y
Device, Bus, or Service Driver
UEFIInterfacePre
Verifier
EFI Driver Dispatcher
Intrinsic Services
Security (SEC)
Boot Execution Flow
![Page 37: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/37.jpg)
POST Execution Flow – High LevelReset
CPU Init
Memory InitCS Init
BootMode
Recovery
S3Resume
ConsoleInit
Device Init
Bus Init
Normal Boot
POSTDispatch
Boot DevSelect
EFI Pre-bootApplication
Legacy OSLoad
OS Runtime
Boot Execution Flow
![Page 38: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/38.jpg)
POST Execution Flow – High LevelReset
CPU Init
Memory InitCS Init
BootMode
Recovery
S3Resume
ConsoleInit
Device Init
Bus Init
Normal Boot
POSTDispatch
Boot DevSelect
EFI Pre-bootApplication
Legacy OSLoad
OS Runtime
ConsoleInit
Device Init
Bus Init
POSTDispatch
Boot DevSelect
EFI Pre-bootApplication
Legacy OSLoad
OS Runtime
PEI
FirmwareVolumes
Cache as RAM
PEIM
Handoff Blocks HOB
NVRAM
Capsules
GUID
*
Boot Execution Flow
![Page 39: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/39.jpg)
POST Execution Flow – High LevelReset
CPU Init
Memory InitCS Init
BootMode
Recovery
S3Resume
ConsoleInit
Device Init
Bus Init
Normal Boot
POSTDispatch
Boot DevSelect
EFI Pre-bootApplication
Legacy OSLoad
OS Runtime
Reset
CPU Init
Memory InitCS Init
BootMode
Recovery
S3Resume
Boot DevSelect
EFI Pre-bootApplication
Legacy OSLoad
OS Runtime
DXE
EFI DriverDispatcher
EFI/DXE Drivers
EFI Boot Services
Boot Execution Flow
![Page 40: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/40.jpg)
POST Execution Flow – High LevelReset
CPU Init
Memory InitCS Init
BootMode
Recovery
S3Resume
ConsoleInit
Device Init
Bus Init
Normal Boot
POSTDispatch
Boot DevSelect
EFI Pre-bootApplication
Legacy OSLoad
OS Runtime
Normal Boot
Reset
CPU Init
Memory InitCS Init
BootMode
Recovery
S3Resume
ConsoleInit
Device Init
Bus Init
POSTDispatch
EFI Pre-bootApplication
Legacy OSLoad
OS Runtime
BDS
EFI Boot Manager
Human Interface HII
Platform Policy
Boot Execution Flow
![Page 41: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/41.jpg)
POST Execution Flow – High LevelReset
CPU Init
Memory InitCS Init
BootMode
Recovery
S3Resume
ConsoleInit
Device Init
Bus Init
Normal Boot
POSTDispatch
Boot DevSelect
EFI Pre-bootApplication
Legacy OSLoad
OS Runtime
Reset
CPU Init
Memory InitCS Init
BootMode
Recovery
S3Resume
ConsoleInit
Device Init
Bus Init
POSTDispatch
Boot DevSelect
TSL
Compatibility Support Module CSM
EFI Preboot
EFI Runtime Services
Boot Execution Flow
![Page 42: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/42.jpg)
Architecture Execution Flow
Pre EFIInitialization (PEI)
Driver Execution Environment
(DXE)
Boot DevSelect(BDS)
Transient System Load
(TSL)
After Life(AL)
Power on [ . . Platform initialization . . ] [ . . . . OS boot . . . . ] Shutdown
Run Time(RT)
?
OS-PresentApp
Final OS Environment
Final OS Boot Loader
OS-AbsentApp
Transient OS Environment
Transient OS Boot Loader
Boot Manager
CPUInit
Chipset Init
Board Init
verif
y
Device, Bus, or Service Driver
UEFIInterfacePre
Verifier
EFI Driver Dispatcher
Intrinsic Services
Security (SEC)
Boot Execution Flow
![Page 43: UEFI Overview Unified Extensible Firmware Interface (UEFI) Framework UEFI Overview Intel SSG/SSD/UEFI](https://reader038.vdocuments.net/reader038/viewer/2022102502/56649d145503460f949e82ca/html5/thumbnails/43.jpg)