Re: [Qemu-devel] [RFC][PATCH 0/21] QEMU Object Model

[Anthony Liguori <anthony@codemonkey.ws>]

On 07/27/2011 01:51 PM, Paolo Bonzini wrote:
> On 07/27/2011 06:28 PM, Anthony Liguori wrote:
>> On 07/27/2011 10:33 AM, Paolo Bonzini wrote:
>>> On 07/27/2011 02:48 PM, Anthony Liguori wrote:
>>>>
>>>> So the idea here is that the PIC will multiplex a bunch of interrupts
>>>> into a single line?
>>>
>>> Yes, but the device needs to know the interrupt number so it can expose
>>> it through the enumerator interface. So the configuration cannot be
>>> simply
>>>
>>> pic->irq[n] = tty->irq;
>>>
>>> Logically, it's more similar to the ISA case, but I doubt the PIC
>>> distributes all interrupts to everyone in real hardware.
>>>
>>>> Is the enumerator something that has an interface to devices where
>>>> the devices hold this info? Or is the enumerator just a bank of
>>>> flash that's preprogrammed with fixed info?
>>>
>>> The former, at least in theory. Not sure if it also works that way in
>>> real hardware, but that's the model it exposes and the way the Android
>>> guys implemented it.
>>
>> I can't really find what you're describing. I think all the specs are on
>> http://www.milkymist.org/mmsoc.html
>
> That's milkymist, not GoldFish.

Oh, Goldfish is fake. It's not real hardware.

The enumerator device is not a real device.  It's weird because it's 
imaginary and was designed specifically within QEMU.

It's not a good example for discussing modelling.

Regards,

Anthony Liguori

>
> You can see the code at
> https://github.com/patricksjackson/qemu/blob/android/hw/goldfish_device.c (see
> also
> https://github.com/patricksjackson/qemu/blob/android/hw/goldfish_device.h for
> the structs composing the list).
>
> Paolo
>