PORTMAP_L0_SHIFT
i = bit >> PORTMAP_L0_SHIFT;
i = bit >> PORTMAP_L0_SHIFT;
i = bit >> PORTMAP_L0_SHIFT;
#define PORTMAP_L0_MASK ((1U << PORTMAP_L0_SHIFT) - 1)
#define PORTMAP_L0_WORDS (PORTMAP_MAX_BITS >> PORTMAP_L0_SHIFT)