Specifications

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Glossary
16-bit legacy: The traditional PC environment and includes traditional OpROMs and
Compatibility16 code.
BDA: BIOS Data Area.
Compatibility16: The traditional BIOS with POST and BIOS Setup removed. Executes in
16-bit real mode.
CompatibilitySmm: Any IBV-provided SMM code to perform traditional functions that
are not provided by EFI.
CSM: Compatibility Support Module. The combination of EfiCompatibility,
CompatibilitySmm, and Compatibility16.
EBDA: Extended BIOS Data Area.
EfiCompatibility: 32-bit EFI code to generate data for traditional BIOS interfaces or EFI
Compatibility Support Module (CSM) drivers or code to invoke traditional BIOS
services.
EOI: End of Interrupt.
IDT: Interrupt Descriptor Table.
ITC: Interval Timer Counter.
ITM: Interval Timer Match.
IVA: Interruption Vector Table.
NV: Nonvolatile.
PIC: (2) Programmable Interrupt Controller.
PMM: Post Memory Manager.
RACBA: Reserve Area Boot Code Address.
traditional OpROM: 16-bit OpROMs that are executed in real mode.