Intel Extensible Firmware Interface - Manual (Page 1065)

Glossary
Version 1.10 12/01/02 Glossary-17
USB Host Controller
Moves data between system memory and devices on the USB Bus by processing
data structures and generating the USB transactions. For USB 1.1, there are
currently two types of USB Host Controllers: UHCI and OHCI.
USB Hub A special USB Device through which more USB devices can be attached to the
USB Bus .
USB I/O Protocol A software interface that provides services to manage a USB Controller , and
services to move data between a USB Controller and system memory.
USB Interface The USB Interface is the basic unit of a physical USB Device .
USB See Universal Serial Bus .
Variable Services The set of functions used to manage variables. Includes GetVariable() ,
SetVariable() , and GetNextVariableName() .
Virtual Memory Services
The set of functions used to manage virtual memory. Includes
SetVirtualAddressMap() and ConvertPointer() .
VM The Virtual Machine, a pseudo processor implementation consisting of registers
which are manipulated by the interpreter when executing
EBC instructions.
Watchdog Timer An alarm timer that may be set to go off. This can be used to regain control in
cases where a code path in the boot services environment fails to or is unable to
return control by the expected path.
WfM See Wired for Management .
Wired for Management (WfM)
Refers to the Wired for Management Baseline Specification. The Specification
defines a baseline for system manageability issues; its intent is to help lower the
cost of computer ownership.