RTEMS Porting Guide
There are two related macros used to defines the number of entries in the _ISR_Vector_table managed by RTEMS. The macro CPU_INTERRUPT_NUMBER_OF_VECTORS is the actual number of vectors supported by this CPU model. The second macro is the CPU_INTERRUPT_MAXIMUM_VECTOR_NUMBER. Since the table is zero-based, this indicates the highest vector number which can be looked up in the table and mapped into a user provided handler.
#define CPU_INTERRUPT_NUMBER_OF_VECTORS 32
#define CPU_INTERRUPT_MAXIMUM_VECTOR_NUMBER \
(CPU_INTERRUPT_NUMBER_OF_VECTORS - 1)
RTEMS Porting Guide
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