RTEMS | bsps/leon3: Limit the interrupt map to 32 lines (!1514)

[Matteo Concas (@matteo.concas)]

Matteo Concas started a new discussion on bsps/sparc/leon3/start/eirq.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1514#note_160070

 >  
 >  #ifdef LEON3_IRQAMP_IRQMAP
 >  /* Mapping from bus interrupt lines to IRQ(A)MP interrupt lines */
 > -rtems_vector_number LEON3_IrqCtrl_Mapping[ BSP_INTERRUPT_VECTOR_MAX_MAP + 1 ];
 > +rtems_vector_number LEON3_IrqCtrl_Mapping[ BSP_INTERRUPT_VECTOR_COUNT ];
 > +
 > +/*
 > + * A map field is eight bits wide.  A field value above the last interrupt
 > + * line of the IRQ(A)MP selects no interrupt line.  Line 0 is no interrupt.
 > + */
 > +static rtems_vector_number leon3_irqmap_line( uint32_t field )

I don't know in which situations would reading this register gives an invalid value (I don't think it's possible unless you get a bus error or a SEU). But I don't think we should fail silently in this case since the software map will not be representative of the hardware one.

Note that when _writing_ to the mapping registers, each value is bounded using a modulo of the maximum bus interrupt line in the system. So on the GR740, writing 33 to one of the fields will result in a mapping to interrupt line 1.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1514#note_160070
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