PORTMAP_L1_SHIFT
i = chunk_bit >> PORTMAP_L1_SHIFT;
const unsigned off = v >> PORTMAP_L1_SHIFT;
i = chunk_bit >> PORTMAP_L1_SHIFT;
i = chunk_bit >> PORTMAP_L1_SHIFT;
#define PORTMAP_L1_MASK ((1U << PORTMAP_L1_SHIFT) - 1)
((PORTMAP_MAX_BITS / PORTMAP_L0_WORDS) >> PORTMAP_L1_SHIFT)