arch/ia64/efirtc.rst

13 the IA-64 platform.
31 Because we wanted to minimize the impact on existing user-level apps using
33 used today with the legacy RTC driver (driver/char/rtc.c). However, because
39 the reference date is different. Year is the using the full 4-digit format.
48 ioctl()s. The other is read-only via the /proc filesystem.
52 To allow for a uniform interface between the legacy RTC and EFI time service,
53 we have created the include/linux/rtc.h header file to contain only the
54 "public" API of the two drivers.  The specifics of the legacy RTC are still
62 Two ioctl()s, compatible with the legacy RTC calls:
66 		ioctl(d, RTC_RD_TIME, &rtc);
70 		ioctl(d, RTC_SET_TIME, &rtc);
72 The rtc is a pointer to a data structure defined in rtc.h which is close
94 	# /sbin/hwclock --show
95 	Mon Mar  6 15:32:32 2000  -0.910248 seconds
99 	# /sbin/hwclock --systohc
103 4. Wakeup Alarm service
106 EFI provides an API by which one can program when a machine should wakeup,
108 RTC which is some kind of interval timer alarm. For this reason we don't use
110 introduced 2 news ioctl()s to the interface of an RTC.
133 As of today, none of the existing user-level apps supports this feature.