> Sorry to spam again but I couldn't figure out this on my own. > Questions:
You again replied to an unrelated message instead of starting a new thread too, sigh. > 1. Does LinuxBIOS actually program the HT interrupt definition > registers > based on the interrupt capability and mobo config, or does Linux do > this? Or > is it up to the driver? LinuxBIOS has to do at least some of the configuration. It probably does it all, I didn't check. Linux will at runtime change some settings. Unrelated device drivers do not touch any of this. > 2. What's the recommended way of doing HT interrupt that will work > with both > APIC and 8259? EOI seems to be APIC only (can be turned off in the > interrupt request) and I guess I can't rely on EOI to always be there? I have no idea what your question is. You *have* to do EOI on level triggered interrupts and you *have* to refrain from using it on edge triggered interrupts, or things will go (horribly and/or subtly) wrong. > 3. EOI in a way acts as flow control. So without EOI is it possible > that I > can flood the PIC/APIC with too many interrupt packets? No, only one interrupt packet is sent from the HT APIC over the HT bus; and only one packet (the EOI packet) is sent back. > I suppose the > credit based flow control in HT can take care of this... That doesn't prevent flooding, it just prevents losing packets. Segher -- linuxbios mailing list [email protected] http://www.openbios.org/mailman/listinfo/linuxbios
