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Re: [Xen-devel] [PATCH][VT] Clear the pending interrupt on shared page w

from [Keir Fraser]

[Permanent Link][Original]

To:	"Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>
Subject:	Re: [Xen-devel] [PATCH][VT] Clear the pending interrupt on shared page when PIC initialized
From:	Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date:	Mon, 12 Sep 2005 18:36:09 +0100
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On 12 Sep 2005, at 12:11, Jiang, Yunhong wrote:

This patch works for following scenerio:
1) The BIOS set the irq base to 0x20, and then interrupt is injected
through shared page.
2) The OS disable interurpt , and reset the PIC with ICW1~ICW4. In this

process, it changes the irq base for PIC from 0x20 to 0x30 throughICW2.

Okay, thanks for the clarification and I see why the PIT bart is needednow. But, in the PIC code, wouldn't hanging the reset off ofcpu_reset_interrupt() make more sense?


 -- Keir


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