[haiku-bugs] Re: [Haiku] #5487: [ACPI] PowerStatus fails to KDL during start with "Unexpected exception 'Divide Error Exception'"
- From: "siarzhuk" <trac@xxxxxxxxxxxx>
- Date: Mon, 01 Mar 2010 17:25:09 -0000
#5487: [ACPI] PowerStatus fails to KDL during start with "Unexpected exception
'Divide Error Exception'"
--------------------------+-------------------------------------------------
Reporter: siarzhuk | Owner: nobody
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: Drivers/ACPI | Version: R1/alpha1
Keywords: | Blockedby:
Platform: All | Blocking:
--------------------------+-------------------------------------------------
Comment(by siarzhuk):
Replying to [comment:2 mmlr]:
> I'd hazard a guess and say it's [source:haiku/trunk/src/add-
ons/kernel/drivers/power/enhanced_speedstep/frequency.cpp#L153 that
division]. Both that and the one above don't check for getting 0 after the
shift.
For debug purposes I have traced msr, id and 8-shifted id and returned
B_ERROR in zero-case:
{{{
KERN: est: open
KERN: EST: Get frequency table from model specific register
KERN: msr:20 id:0 id8:0
KERN: est: CPU supports Enhanced Speedstep, but is not recognized.
KERN: est: open
KERN: EST: Get frequency table from model specific register
KERN: msr:20 id:0 id8:0
KERN: est: CPU supports Enhanced Speedstep, but is not recognized.
}}}
The check for zero divider is required here in any case.
Probably I can perform more tests to check why it "is not recognized"? Any
suggestions?
--
Ticket URL: <http://dev.haiku-os.org/ticket/5487#comment:4>
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