BMAP_BPW_MASK
mask = 1 <<(bn & BMAP_BPW_MASK);
v = (*vp <<(bn & BMAP_BPW_MASK)) & mask;
bit = 1 <<(bn & BMAP_BPW_MASK);
mask = 1 <<(bn & BMAP_BPW_MASK);
v = (*vp <<(bn & BMAP_BPW_MASK)) & mask;
bit = 1 <<(bn & BMAP_BPW_MASK);