Intel Extensible Firmware Interface, Specification

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Extensible Firmware Interface Specification
84 12/12/00 Version 1.02
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 Description
GetTime Runtime Returns the current time and date, and the time-keeping capabilities of the
platform.
SetTime Runtime Sets the current local time and date information.
GetWakeupTime Runtime Returns the current wakeup alarm clock setting.
SetWakeupTime Runtime Sets the system wakeup alarm clock time.