Time Services; Time Services Functions - Intel Extensible Firmware Interface Specification

Extensible Firmware Interface Specification
3.6

Time Services

This section contains function definitions for time-related functions that are typically needed by
operating systems at runtime to access underlying hardware that manages time information and
services. The purpose of these interfaces is to provide operating system writers with an abstraction
for hardware time devices, thereby relieving the need to access legacy hardware devices directly.
There is also a stalling function for use in the pre-boot environment. Table 3-11 lists the time
services functions described in this section:
Table 3-11. Time Services Functions
Name Type
GetTime Runtime
SetTime Runtime
GetWakeupTime Runtime
SetWakeupTime Runtime
84
Description
Returns the current time and date, and the time-keeping capabilities of the
platform.
Sets the current local time and date information.
Returns the current wakeup alarm clock setting.
Sets the system wakeup alarm clock time.
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