New API directives to enable/disable interrupt vectors

[Gedare Bloom]

On Wed, Jun 16, 2021 at 12:34 PM Gedare Bloom <gedare at rtems.org> wrote:
>
> On Wed, Jun 16, 2021 at 5:23 AM Sebastian Huber
> <sebastian.huber at embedded-brains.de> wrote:
> >
> > Hello,
> >
> > I work currently on an extension of the interrupt manager API:
> >
> > https://devel.rtems.org/ticket/3269
> >
> > This API is not related to the interrupt handling at processor level. It
> > is related to the management of interrupts at the interrupt controller
> > level.
> >
> What happens in case there's no controller?
>
> > We need directives to enable and disable interrupt vectors.
> > Unfortunately, rtems_interrupt_enable() and rtems_interrupt_disable()
> > are already occupied. My first approach was to use
> > rtems_interrupt_mask() and rtems_interrupt_unmask(), however, I noticed
> > that rtems_interrupt_mask is already used. What about
> >
> > rtems_interrupt_permit()
> >
> > and
> >
> > rtems_interrupt_forbid()
> >
> > ?
> >
> Implicitly, rtems_interrupt_* means a directive oriented toward the
> CPU side of the interrupt management? It seems there should be an
> explicit indicator of API calls that target the controller side, like
> rtems_interrupt_controller_xxx()?
>
> Then you can reuse directive names, like
> rtems_interrupt_controller_disable(). Unless there's a possibility to
> enable/disable the controller itself. in which case, we'd need
> something else like rtems_interrupt_controller_disable_irq(int irq) or
> whatever, and perhaps rtems_interrupt_controller_disable_irqs().
>
Looks like the existing irq-extension.h uses 'vector', so
rtems_interrupt_disable_vector() is a possibility, or else
rtems_interrupt_controller_disable_vector() is more wordy but if we
want to treat 'interrupt controller' as its own category of API
separate from 'interrupt'.

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