UEFI applications

• UEFI is a pre-OS environment, aka, BIOS
• Our execution phase (called "DXE") is:
  • single threaded; no thread or process
  • ring-0 and long-mode
  • single flat address space
• Why
  • Less waste of system resources
  • OS agnostic deigns and dev environment
  • No need to worry about compatibility with OS
  • Easy to access hardware features
  • Well documented API
  • Why would we need an OS?