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Re: How to simulate a device which generates an interrupt every 8.3 ms

From: Jakob Bohm
Subject: Re: How to simulate a device which generates an interrupt every 8.3 ms
Date: Fri, 11 Dec 2020 14:16:57 +0100
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On 2020-12-10 12:07, Peter Maydell wrote:
On Thu, 10 Dec 2020 at 05:28, Weiss, Howard <Howard.Weiss2@hologic.com> wrote:
Hi –

I am writing a Windows 10 device driver which receives an interrupt from 
hardware every 8.3 ms.  I am simulating the hardware device in a linux QEMU/KVM 
VM with Windows 10 installed.  How do I program my simulated device to generate 
an interrupt every 8.3 ms? Under windows, I would generate a high resolution 
timer interrupt using the windows multi-media API.  What is the QEMU/KVM 
Use a QEMUTimer. You can set the expiry period in nanoseconds.
Note that you should probably not expect QEMU's timing to be
accurate to exactly 8.3ms.
I'm guessing any mostly smooth 120Hz interrupt rate would be
fine.  Similar to the 55ms/18.2Hz PC Int08 signal that was
historically 0x10000 ticks per hour, 0x180000 + epsilon ticks/day.


Jakob Bohm, CIO, Partner, WiseMo A/S.  https://www.wisemo.com
Transformervej 29, 2860 Søborg, Denmark.  Direct +45 31 13 16 10
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