hoo boy, interrupt Handling on BGQ

Benjamin Herrenschmidt benh at kernel.crashing.org
Tue Nov 13 09:19:27 EST 2012

On Mon, 2012-11-12 at 15:33 -0600, Jimi Xenidis wrote:
> So interrupts need to go to FW before Linux, please let not talk about how silly that is.
> Lets talk about something far more silly...
> In order to get to the Linux exception handlers, we have to tell FW where the interrupt page is, and then it _copies_ it.
> IFAICT, this means that each vectors on the "copied" page must:
> 1) construct an 64-bit absolute address to a per vector stub
> 2) leap at the (with bctr or blr)
> 3) restore CTR or LR and anything else that (1) messed up
> 4) normal branch to the actual vector
> This is what I'll be working on, but I'd love to hear any other ideas.

Replace the firmware with something sane ?


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