Extend struct todr_chip_handle with a todr_quality member. This allows us
to assign a quality to RTC implementation and pick the "best" RTC if a
system has multiple RTCs (or multiple interfaces to a

Extend struct todr_chip_handle with a todr_quality member. This allows us
to assign a quality to RTC implementation and pick the "best" RTC if a
system has multiple RTCs (or multiple interfaces to an RTC). This allows
us to prefer a battery-backed I2C RTC over an RTC that is part of the SoC
which is only running of the SoC is powered. It also allows us to
work around issues with firmware RTC interfaces that may lie to us or
even crash the system.

This change makes sure the todr_quality member of the struct is always
initialized. In most cases the quality will be set to zero; further
adjustments of the quality for specific subsystems/architectures will follow.

ok cheloha@, patrick@

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Constify struct cfattach.

ok visa@ a long time ago

Remove unused function pointers from `todr_handle'.

from miod@

It's init as a process that's special, not init's original thread.
Remember initprocess instead of initproc.

ok matthew@ blambert@

machdep.kbdreset enables a shutdown by Ctrl-Alt-Del on amd64 and
i386. Stop abusing it on other archs for controling a shutdown by
pressing the soft power button:

* Add a MI sysctl hw.allowpowerdow

machdep.kbdreset enables a shutdown by Ctrl-Alt-Del on amd64 and
i386. Stop abusing it on other archs for controling a shutdown by
pressing the soft power button:

* Add a MI sysctl hw.allowpowerdown; if set to 1 (the default) it
allows a power button shutdown.
* Make acpi(4)/acpibtn(4) honor hw.allowpowerdown.
* Switch the various power button intercepts on landisk, sgi, sparc64
and zaurus over to hw.allowpowerdown.
* Garbage collect the machdep.kbdreset sysctl on all archs other than
amd64 and i386.

ok miod@

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The statement c != '\0' != 0 doesn't make an awful lot of sense, so drop the
!= 0 bit. Makes GCC 4.2.1 happy.

Fix typo.

Turns out getpropstring() returns an empty string if a property is missing
instead of NULL. Makes rtc(4) really work on the u25.

tested by mikeb@

Add support for the Texas Instruments bq4802 real-time clock found on the
Ultra 25 and Ultra 45.

Fix whitespace.

Tell init(8) to power down machine instead of just halting it.

ok deraadt@

Unbreak the tree.

Seperate rtc(4) code out into its own file. Add support for catching the
power button interrupts on ds1287 models. The hardware will stil power off
automatically about 20 seconds after the power bu

Seperate rtc(4) code out into its own file. Add support for catching the
power button interrupts on ds1287 models. The hardware will stil power off
automatically about 20 seconds after the power button is pressed, but we get
a decent chance at doing a clean shutdown before that.

"a good start" deraadt@

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