On Thu, 2008-08-21 at 09:13 +0200, Sébastien Chrétien wrote: > Hello, > > What are the constraints in order to implement a irq_init function ?
You mean ppc_md.init_IRQ() ? If so, it's a hook you can use to setup your interrupt controller. It's called from init_IRQ() (arch/powerpc/kernel/irq.c), which is called from start_kernel() (init/main.c). Not long after it is called irqs are enabled. I think it is the last callback into arch code before irqs are enabled. When it is called the device tree is unflattened, so you can use the of_ API. Bootmem is setup so you can use alloc_bootmem(), but you can't kmalloc yet. ioremap should work. > What is the aim or get_irq ? Does it retun an information about the > mask, the states, or... ? The aim of ppc_md.get_irq() ? It's called from do_IRQ() (arch/powerpc/kernel/irq.c) which is called from assembler in the appropriate head_x.S It just returns the number (virtual number) of the irq that just fired. If for some reason you took a spurious interrupt it should return NO_IRQ. I'm not sure what you mean about masks or states, someone else might though. cheers -- Michael Ellerman OzLabs, IBM Australia Development Lab wwweb: http://michael.ellerman.id.au phone: +61 2 6212 1183 (tie line 70 21183) We do not inherit the earth from our ancestors, we borrow it from our children. - S.M.A.R.T Person
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