cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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rtc-cdev (2024B)

      1What:		/dev/rtcX
      2Date:		April 2005
      3KernelVersion:	2.6.12
      4Contact:	linux-rtc@vger.kernel.org
      5Description:
      6		The ioctl interface to drivers for real-time clocks (RTCs).
      7		Following actions are supported:
      8
      9		* RTC_RD_TIME, RTC_SET_TIME: Read or set the RTC time. Time
     10		  format is a Gregorian calendar date and 24 hour wall clock
     11		  time.
     12
     13		* RTC_AIE_ON, RTC_AIE_OFF: Enable or disable the alarm interrupt
     14		  for RTCs that support alarms
     15
     16		* RTC_ALM_READ, RTC_ALM_SET: Read or set the alarm time for
     17		  RTCs that support alarms. Can be set upto 24 hours in the
     18		  future. Requires a separate RTC_AIE_ON call to enable the
     19		  alarm interrupt. (Prefer to use RTC_WKALM_*)
     20
     21		* RTC_WKALM_RD, RTC_WKALM_SET: For RTCs that support a more
     22		  powerful interface, which can issue alarms beyond 24 hours and
     23		  enable IRQs in the same request.
     24
     25		* RTC_PIE_ON, RTC_PIE_OFF: Enable or disable the periodic
     26		  interrupt for RTCs that support periodic interrupts.
     27
     28		* RTC_UIE_ON, RTC_UIE_OFF: Enable or disable the update
     29		  interrupt for RTCs that support it.
     30
     31		* RTC_IRQP_READ, RTC_IRQP_SET: Read or set the frequency for
     32		  periodic interrupts for RTCs that support periodic interrupts.
     33		  Requires a separate RTC_PIE_ON call to enable the periodic
     34		  interrupts.
     35
     36		* RTC_VL_READ: Read the voltage inputs status of the RTC when
     37		  supported. The value is a bit field of RTC_VL_*, giving the
     38		  status of the main and backup voltages.
     39
     40		* RTC_VL_CLEAR: Clear the voltage status of the RTC. Some RTCs
     41		  need user interaction when the backup power provider is
     42		  replaced or charged to be able to clear the status.
     43
     44		The ioctl() calls supported by the older /dev/rtc interface are
     45		also supported by the newer RTC class framework. However,
     46		because the chips and systems are not standardized, some PC/AT
     47		functionality might not be provided. And in the same way, some
     48		newer features -- including those enabled by ACPI -- are exposed
     49		by the RTC class framework, but can't be supported by the older
     50		driver.