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Re: [Xen-devel] RE: A question about PIT platform timer
| To: | "Tian, Kevin" <kevin.tian@xxxxxxxxx>, Keir Fraser <keir@xxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] RE: A question about PIT platform timer |
| From: | Keir Fraser <keir@xxxxxxxxxxxxx> |
| Date: | Mon, 11 Dec 2006 14:35:35 +0000 |
| Delivery-date: | Mon, 11 Dec 2006 06:35:43 -0800 |
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| Thread-topic: | [Xen-devel] RE: A question about PIT platform timer |
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On 11/12/06 12:10, "Tian, Kevin" <kevin.tian@xxxxxxxxx> wrote: > Yes, there's no interrupt from it. But what's the known frequency? > CALIBRATE_LATCH or CLOCK_TICK_RATE? platform_timer_scale > is set to the later, and so ch2 needs to work on same frequency or > else count value will result incorrect offset. However I didn't see such > setting on ch2. Does I miss something? :-) All the PIT channels tick at CLOCK_TICK_RATE. Mode-0 is not auto-relatching, so when the counter reaches 0000 it carries on FFFF, FFFE, FFFD, .... So we calculate platform system time as: system_timestamp + (pit_timestamp - pit_timenow) * (delta_system/delta_pit) -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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