Despite some superficial similarities of register layout, the
M-profile NVIC is really very different from the A-profile GIC.
Our current attempt to reuse the GIC code means that we have
significant bugs in our NVIC.
Implement the NVIC as an entirely separate device, to give
us somewhere we can get the behaviour correct.
This initial commit does not attempt to implement exception
priority escalation, since the GIC-based code didn't either.
It does fix a few bugs in passing:
* ICSR.RETTOBASE polarity was wrong and didn't account for
internal exceptions
* ICSR.VECTPENDING was 16 too high if the pending exception
was for an external interrupt
* UsageFault, BusFault and MemFault were not disabled on reset
as they are supposed to be
Signed-off-by: Michael Davidsaver <mdavidsaver@gmail.com>
[PMM: reworked, various bugs and stylistic cleanups]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
da6d674e50