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[Qemu-devel] Re: Extending qemu_irq for reset signals

From: Paul Brook
Subject: [Qemu-devel] Re: Extending qemu_irq for reset signals
Date: Wed, 15 Aug 2007 17:34:09 +0100
User-agent: KMail/1.9.7

On Wednesday 15 August 2007, Blue Swirl wrote:
> Hi,
> I'd like to use similar mechanism as qemu_irq as reset signal for
> devices. The difference is that the opaque data and callback are not
> specified at the time of creating the signal at upstream device, but
> when the receiving device is created. This does not fit current
> qemu_irq model.

Either your confused, or not expressing what you want very well. What you 
describe is how qemu_irq works.

The "upstream device" and "receiving device" are the same thing.

The whole point of qemu_irq is to be able to send a single-bit signal without 
having to know or care where it's going. ie. when creating the board/cpu, you 
create the qemu_irq object with appropriate parameters. Then the device 
initiating the reset uses that qemu_irq object.

If the device initiating the reset needs to pass additional information, then 
you're no longer dealing with a single bit of state, so I don't think 
qemu_irq is really appropriate.


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