Event, Timer, And Task Priority Services; Event, Timer, And Task Priority Functions - Intel Extensible Firmware Interface Specification

Extensible Firmware Interface Specification
The rest of this chapter discusses individual functions. Global boot services functions fall into
these categories:
•
Event, Timer, and Task Priority Services (Section 3.1)
•
Memory Allocation Services (Section 3.2)
•
Protocol Handler Services (Section 3.3)
•
Image Services (Section 3.4)
•
Miscellaneous Services (Section 3.8)
Runtime Services fall into these categories:
•
Variable Services (Section 3.5)
•
Time Services (Section 3.6)
•
Virtual Memory Services (Section 3.7)
•
Miscellaneous Services (Section 3.8)
3.1

Event, Timer, and Task Priority Services

The functions that make up the Event, Timer, and Task Priority Services are used during pre-boot
to create, close, signal, and wait for events; to set timers; and to raise and restore task priority
levels. See Table 3-1.
Table 3-1.

Event, Timer, and Task Priority Functions

Name
CreateEvent
CloseEvent
SignalEvent
WaitForEvent
CheckEvent
SetTimer
RaiseTPL
RestoreTPL
26
Type Description
Boot Creates a general-purpose event structure.
Boot Closes and frees an event structure.
Boot Signals an event.
Boot Stops execution until an event is signaled.
Boot Checks whether an event is in the signaled state.
Boot Sets an event to be signaled at a particular time.
Boot Raises the task priority level.
Boot Restores/lowers the task priority level.
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