RTEMS | bsps/powerpc/psim: The generic interrupt support is not initialized (#5800)

[Sebastian Huber (@sebhub)]

Issue created by Sebastian Huber: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5800



The BSP dispatches its interrupts through the legacy handler tables of the shared PowerPC code and never initializes the generic interrupt support.  `rtems_interrupt_entry_install()` and the other directives therefore return `RTEMS_INCORRECT_STATE`.  The directives which query or change a vector are stubs.  The decrementer has the vector of OpenPIC source 15.  No vector can be raised by software, so tm27 uses the decrementer.

`ts-validation-intr` fails on `powerpc/psim` and ends with a spurious interrupt fatal error.  The test runner marks it as an expected failure without a reason.

Found while running the full test suite on the GDB simulator.  This description was created with Claude Code assistance.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5800
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