[VirtLayer] Changes to the interrupt handling in POK
philipp.eppelt at mailbox.tu-dresden.de
Sun Aug 18 14:03:03 UTC 2013
currently I have no RTEMS partition running on POK, as these changes
must first be validated with pure POK partitions. Also I haven't written
the code to get a interrupt handler through the partition abstraction.
CLOCK_HANDLER is a macro which is incrementing the tick counter and
invoking the scheduler in the POK kernel.
To register IRQ handlers from a partition, e.g. an RTEMS partition, I
need to create a new syscall first, to get the callback function into
the meta_handler list.
So when RTEMS tries to attach to an interrupt, the virtualization layer
implementation of POK is invoked and registers a predefined handler via
a syscall with the meta_handler for this irq number. When the interrupt
occurs the registered handler is invoked with the vector number as an
argument. Then the handler invokes C_dispatch_isr() in RTEMS passing the
vector number along.
That's the plan, for the next week.
On 08/18/2013 02:45 PM, Cláudio Silva wrote:
> Good job Philipp. It seems a nice first iteration for interrupt
> virtualization. Did you get to try it?
> If I got it right, the POK part of the interrupt handler (CLOCK_HANDLER
> ??) is running after the virtualized RTEMS handler?
> On Sun, Aug 18, 2013 at 12:18 AM, Philipp Eppelt
> <philipp.eppelt at mailbox.tu-dresden.de
> <mailto:philipp.eppelt at mailbox.tu-dresden.de>> wrote:
> lately I worked a lot to extend POK with necessary features to
> accommodate an RTEMS partition.
> Since hello world works, I need a way to pass clock ticks to the RTEMS
> partition running on POK. Therefore the interrupt handling needs to
> support custom handlers.
> If everything works out, I can enable the virtualization layer to
> register an interrupt vector and if it occurs RTEMS is notified by
> invoking C_dispatch_isr().
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> rtems-devel at rtems.org <mailto:rtems-devel at rtems.org>
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