[RTEMS Project] #2348: Timecounter: Add NTP support

[RTEMS trac]

#2348: Timecounter: Add NTP support
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 Reporter:  Sebastian Huber  |       Owner:  (none)
     Type:  enhancement      |      Status:  new
 Priority:  normal           |   Milestone:  Indefinite
Component:  score            |     Version:
 Severity:  normal           |  Resolution:
 Keywords:                   |  Blocked By:
 Blocking:                   |
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Comment (by Chris Johns):

 There needs to be an interface in the `score` to provide access to
 `ntp_update_second()`. The call may not be present in the kernel sources,
 it will mostly likely be provided by an application or an external library
 such as `libbsd.a`.

 I suggest a file is added to the `score` that contains
 `ntp_update_second()` and that function checks a function pointer and if
 set the function is called. This brings `kern_tc.c` closer to upstream
 FreeBSD sources.

 While on the topic of `kern_tc.c` and being as close to FB as we can, I
 think the RTEMS doxygen comments should be removed. We should maintain a
 common policy for imported sources like this.

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Ticket URL: <http://devel.rtems.org/ticket/2348#comment:2>
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