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Relating rtems_symbolic_irq_name to vector number
- Date: Thu, 20 Feb 2003 13:39:00 -0500 (EST)
- From: gregory.menke at gsfc.nasa.gov (gregory.menke at gsfc.nasa.gov)
- Subject: Relating rtems_symbolic_irq_name to vector number
> Yeah, it's confusing. Look in "c/src/lib/libbsp/powerpc/shared/irq/irq.h"
> If I remember right (am currently at home), The 16 ISA interrupts are first,
> then come the OpenPIC interrupts.
> You'd have to know which PCI interrupt the chip is using and how your
> board routs that IRQ to the OpenPIC. Let's say it uses IRQA and that's
> hooked to IRQ8 at the OpenPIC. The correct name would then be
> 8 + BSP_PCI_IRQ_LOWEST_OFFSET
> OTOH, if the PCI configuration registers are set up correctly by the
> firmware, you should be able to just read the INTERRUPT_LINE
> register from PCI configuration space.
> The RTEMS/ppc/shared BSP uses a 1:1 mapping between interrupt
> line and 'name'.
Actually the problem is worse. I can get the vector from the card no
problem and get the interrupt set up- the existing code woks ok for
that. I also found the PPC vectoring code which makes sense, but the
handlers are not passed any parameters... not even the vector. I
suppose a good reason was given at some point for lossage like this,
but its quite annoying. I presume its also why the unit # has been
hardcoded in the dec and fxp drivers. Is there any reason why I
shouldn't tweak the vectoring code to pass the irq #- it won't cost
but a couple instructions and will make the vectoring much simpler.
> >I'm working on getting multiple DEC21140 units to work, so far I'm
> >making progress- a single board arrangement still works... ;) But I'm
> >not quite sure how to relate an irqname to the vector that comes in on
> >the interrupt. From looking at the bsp's irq management defines it
> >seems like theres probably a way to work from one to the other, but
> >due to me not having lots of experience with the ppc, I'm not sure
> >where to look. Any hints are appreciated.