Uefi and bios

Uefi and bios

• 1.
  Write a programin Python/C++ to test that computer is booted with Legacy Boot ROM-BIOS or UEFI.
• 2.
  UEFI and BIOS
• 3.
  What is BIOSand UEFI..…?
• 4.
  BIOS and UEFIare two firmware interfaces for computers which work as an interpreter between the operating system and the computer firmware. Both of these interfaces are used at the startup of the computer to initialize the hardware components and start the operating system.
• 5.
  What is Firmware..…?
• 6.
   Installed witha computer in a non-volatile location (PROM/EEPROM)  Initializes low level hardware  Initializes memory controller timings, powers on critical boot devices.  Hands off control to operating system loader  Operating system loader uses firmware interfaces to initialize the operating system.  Referred to as pre-boot firmware  Examples: BIOS and UEFI.
• 7.
  What is ExtensibleFirmware Interface (EFI)  The Extensible Firmware Interface (EFI) is a specification that defines a software interface between an operating system and platform firmware.  EFI is a replacement for older BIOS firmware interface present in all IBM PC – compatible personal computers. 7
• 8.
  Position of EFI
• 9.
  Transition from EFIto UEFI  The emergence of x64 architecture provides an inflection point to begin industry wide transition to EFI  To encourage transition, the UEFI Forum was created in 2005, which is now responsible for EFI development  UEFI version 2.3 published in May 2009.
• 10.
  BIOS firmware Mechanism used to boot PCs for the last 25+ years  All x86/x64 architecture machines in the market support BIOS firmware.  In early systems (16-bit era) BIOS was used for hardware access  Operating systems would call the BIOS rather than directly accessing the hardware (ex. MS-DOS).  In 32-bit era OSs instead generally directly accessed the hardware using their own device drivers
• 11.
  BIOS limitations BIOS showing its age Over 25 years old. Documentation is scattered.  Non – graphical interface  Programmed in hex/assembly code  Regarded as legacy firmware 11
• 12.
  Overcoming BIOS limitations  EFI adds support for a new partition scheme : GUID Partition Table(GPT)  Unlimited partitions can be created (W-128).  Maximum disk and partition size of 9.4 ZB.  UEFI processor mode can be either 32-bit or 64-bit (long mode)  Architecture is modular and extensible  Graphical user interface  Can be programmed in C/C++  EFI interfaces are object oriented
• 13.
  Thank you