New hal port + interrupts + rescheduling + call_pending_dsrs problem

["Davy Wouters" <davy.wouters.atos@gmail.com>]

Hi all,

I have done a hal port to the Analog Devices Blackfin processor
starting from the latest from cvs version of ecos.
I don't quite understand how the interrupt handling in
default_interrupt_vsr works.

When an interrupt occurs from my uart, i have a interrupt trampoline
which does some vector translation and then calls the
hal_interrupt_default_vsr which calls the isr of my uart rx interrupt.
This isr requests a dsr to run.
I have made the hal_interrupt_default_vsr as instructed ending with
the interrupt_end call from the interrupt object of the kernel.

One of the problems i seem to have is that call_pending_dsrs is called
(from within interrupt_end - scheduler::unlock_inner) while
the processor is still running at the interrupt level of my uart.
(Nested interrupts are disabled, no separate interrupt stack is used)

I assume a return from interrupt should be executed somewhere between
the execution of the isr/post_dsr and the call_pending_dsrs?
Where would this be done, in other words at which point in the hal do
i need to return from my interrupt?

Is it correct that call_pending_dsrs should be executed only when
other interrupts are allowed again, in other words after return from
the interrupt?

Sorry if my questions are a bit confusing, but i don't quite
understand the problems i'm having at this point (Crashes when having
a lot of communication
on my uart rx resulting in ASSERT_FAIL: <6>mutex.cxx[249]cyg_bool
Cyg_Mutex::lock() Locking mutex I already own)

Any suggestions?

Tnx,
Davy Wouters
Atos engineering