Advanced Configuration and Power Interface Specification

ACPI-Defined Devices and Device-Specific Objects
Arguments: (0)
Return Value:
A 32-bit integer containing a result bitmask as follows:
Bit [0] - 1 = AC wake implemented, 0 = not supported
Bit [1] - 1 = DC wake implemented, 0 = not supported
Bit [2] - 1 = Get/Set real time features implemented, 0 = not supported
Bit [3] - 1 = Real time accuracy in milliseconds, 0 = Real time accuracy in seconds
Bit [31:4] are reserved and must be 0.
9.18.3 _GRT (Get Real Time)
This object is required if the capabilities bit 2 is set to 1. The OSPM can use this object to get time.
The return value is a buffer containing the time information as described below.
Arguments: (0)
Return Value:
A buffer containing the time information, in the following format
Buffer(){
WORD Year; // 1900 - 9999
BYTE Month; // 1 - 12
BYTE Day; // 1 - 31
BYTE Hour; // 0 - 23
BYTE Minute; // 0 - 59
BYTE Second; // 0 - 59
BYTE Valid;
// 0 - Time is not valid (request failed); 1 - Time is valid
WORD milliseconds, // 1-1000
WORD TimeZone; // -1440 to 1440 or 2047 (unspecified)
BYTE Daylight;
BYTE Pad2[3]; // Reserved, must be zero
}
9.18.4 _SRT (Set Real Time)
This object is required if the capabilities bit 2 is set to 1. The OSPM can use this object to set the
time. The argument is a buffer containing the time information, as defined above.
Arguments: (1)
A buffer containing the time information, in the following format:
Version 6.0 543