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[Xen-devel] A question about PIT platform timer
| To: | "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] A question about PIT platform timer |
| From: | "Tian, Kevin" <kevin.tian@xxxxxxxxx> |
| Date: | Mon, 11 Dec 2006 17:05:51 +0800 |
| Delivery-date: | Mon, 11 Dec 2006 01:05:54 -0800 |
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| Thread-topic: | A question about PIT platform timer |
Just note that pit_read_counter is implemented on top of CH2 of PIT, which is known as mode 0 to calibrate TSC earlier. However I see no place to re-initialize it again and it's used as the source of platform timer count (when using_pit==1) immediately. It seems like weird usage since mode0 channel will fall into a loop starting counting down from 0xFFFF forever if nobody re-latches it again, which indicates a 18.2065 Hz source while platform_timer_scale is set as CLOCK_TICK_RATE. Seems ch0 is what's really wanted... Is it a typo, or any special usage on ch2? Thanks, Kevin _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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