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.