svn commit: r223426 - in head/sys: dev/acpica kern sys x86/x86

[Alexander Motin]

Marcel Moolenaar wrote:
> On Jun 22, 2011, at 5:30 PM, Alexander Motin wrote:
>> Marcel Moolenaar wrote:
>>> On Jun 22, 2011, at 4:24 PM, Jung-uk Kim wrote:
>>>> I just realized kern_clocksource.c was excluded for arm and ia64.  
>>>> Here is updated patch.  Please ignore the previous one.
>>> Any reason why we're not adding kern_clocksource.c for them?
>> Their event timers code still waits for refactoring. I have neither
>> documentation nor hardware for them. Help would be appreciated.
> 
> Can you give me a pointer to a document orpage that describes
> what is being refactored, why and how?

In short, timer management code was unified and formalized. Instead of
direct programming periodic timers from MD code and calling hard-/
stat-/ profclock() from there, timer hardware should be exposed to the
MI kernel using sys/timeet.h API to allow kern_clocksource.c manage it.
Last require calling its cpu_initclocks_bsp() and cpu_initclocks_ap()
callbacks from MD initialization code, and cpu_idleclock() and
cpu_activeclock() from MD cpu_idle().

Here is some references:
man 4 eventtimers
http://wiki.freebsd.org/201010DevSummit?action=AttachFile&do=view&target=timers.pdf
http://svnweb.freebsd.org/base?view=revision&revision=209371
http://svnweb.freebsd.org/base?view=revision&revision=212541

All architectures except ia64 and non-Marvell arm are already done, so
you may took any of them as reference. Ask me if you have any questions.

-- 
Alexander Motin