src/sys/dev/dec/mcclock.c, branch release/6.0.0_cvs

This commit was manufactured by cvs2svn to create tag

2005-11-03T00:35:26+00:00

'RELENG_6_0_0_RELEASE'.

This commit was manufactured to restore the state of the 6.0-RELEASE image.

Start each of the license/copyright comments with /*-, minor shuffle of lines

2005-01-06T01:43:34+00:00

Use __FBSDID().

2003-08-24T17:55:58+00:00

Also some minor style cleanups.

Introduce a boot environment variable (clock_compat_osf1) which can

2001-11-03T17:22:50+00:00

be set to 1 to make FreeBSD and Tru64 coexist peacefully on a dual
boot system and not clobber each other's year in the TOY clock.
(Tru64 uses an offset 52 years higher than one would expect)

Obtained from: NetBSD
MFC After: 1 week

Fix a botch where we wrote the year register with > 2 digits (and

2001-03-09T20:39:02+00:00

then knocked the extra digits off). Blegh. Update the comment and
adjustment method reading the chip clock year register to note that
anything less than 70 means we're past the year 2000.

Ho, ho, ho... this clock chip is not y2k compliant. Motorola

2000-01-04T03:22:04+00:00

has it blacklisted. Silly us for not planning ahead. Tsk. Anyway-
a 10 year window patch is probably sufficient to still detect
nonsense in the clock but allow us to roll past the year 2000.

$Id$ -> $FreeBSD$

1999-08-28T01:08:13+00:00

Calibrate the processor cycle counter instead of believing what the

1999-05-18T21:24:16+00:00

firmware says.

Major changes to the generic device framework for FreeBSD/alpha:

1998-06-14T13:46:10+00:00

* Eliminate bus_t and make it possible for all devices to have
  attached children.

* Support dynamically extendable interfaces for drivers to replace
  both the function pointers in driver_t and bus_ops_t (which has been
  removed entirely.  Two system defined interfaces have been defined,
  'device' which is mandatory for all devices and 'bus' which is
  recommended for all devices which support attached children.

* In addition, the alpha port defines two simple interfaces 'clock'
  for attaching various real time clocks to the system and 'mcclock'
  for the many different variations of mc146818 clocks which can be
  attached to different alpha platforms.  This eliminates two more
  function pointer tables in favour of the generic method dispatch
  system provided by the device framework.

Future device interfaces may include:

* cdev and bdev interfaces for devfs to use in replacement for specfs
  and the fixed interfaces bdevsw and cdevsw.

* scsi interface to replace struct scsi_adapter (not sure how this
  works in CAM but I imagine there is something similar there).

* various tailored interfaces for different bus types such as pci,
  isa, pccard etc.

Add initial support for the FreeBSD/alpha kernel. This is very much a

1998-06-10T10:57:29+00:00

work in progress and has never booted a real machine.  Initial
development and testing was done using SimOS (see
http://simos.stanford.edu for details).  On the SimOS simulator, this
port successfully reaches single-user mode and has been tested with
loads as high as one copy of /bin/ls :-).

Obtained from: partly from NetBSD/alpha