Messages in this thread |  | | | Subject | Re: [PATCH] 2.6.18-rt7: PowerPC: fix breakage in threaded fasteoi type IRQ handlers | | From | Benjamin Herrenschmidt <> | | Date | Mon, 20 Nov 2006 07:41:25 +1100 |
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> This is not implicit -- CPU has to read INTACK reg. on OpenPIC.
Which is what I meant... "implicit by reading the vector".
> Really implicit method is in action on x86 where CPU issues dual ACK bus cycle to get > the vector form 8259...
Which you can do on OpenPIC too. It's the same idea. The concept that obtaining the vector performs the ack.
> > EOI is a more "high level" thing that some "intelligent" PICs that > > automatically raise the priority do to restore the priority to what it > > was before the interrupt occured. > > Thank you, I know. Even 8259 has the notion of priority and EOI works the > same way here.
Ok, so why would you need an ack there then while eoi is just what you need ? :-)
Also, that's interesting what you are saying about 8259... I should be able to convert ppc's i8259 to use fasteoi too...
Ben.
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