Sam Ravnborg wrote:
I have started working on this timer patch again...
I tried looking a sun4d and sun4m to get an example of how to implement
this in a better way, however they seem to implement the per-cpu ticker
using hardcoded IRQ number 14 and a custom trap handler for the per-cpu
timer ticker (see bottom of kernel/sun4m_irq.c: sun4m_init_timers()).
I am slowly looking into introducing generic IRQ support for SPARC.
If I succeed then we will shift to a more dynamic numbering
of interrupts - like sparc64 does.
That would be great. I have not looked so much into the other SPARC32
ports or the SPARC64, however the LEON port handles IRQ always on the
CPU calling request_irq(), since CPU0 initializes everything during
startup CPU0 will end up doing a lot if IRQ work. I wish there where a
way of implementing IRQ routing to different CPUs. In best case during
runtime, however a static configuration is good enough.
Right now I am in a situation where I try to analyse SPARC, existing
codebase and genirq in the kernel. So it will take
a while before I get anywhere with this.
I understand, I'm appreciating your efforts.
Daniel
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