• Austin Zhang's avatar
    atrtc: reads Century field from FADT table · e1ef6c0e
    Austin Zhang authored
    The ACPI spec describes the FADT->Century field as:
    
        The RTC CMOS RAM index to the century of data value (hundred and
        thousand year decimals).  If this field contains a zero, then the
        RTC centenary feature is not supported.  If this field has a non-zero
        value, then this field contains an index into RTC RAM space that
        OSPM can use to program the centenary field.
    
    Use this field to decide whether to program the CENTURY register
    of the CMOS RTC device.
    
    Reviewed by:	akumar3@isilon.com, dab, vangyzen
    MFC after:	1 week
    Sponsored by:	Dell EMC Isilon
    Differential Revision:	https://reviews.freebsd.org/D33667
    
    MFC after:	1 week
    Sponsored by:	Dell EMC Isilon
    e1ef6c0e