L1_S_OFFSET
(vaddr & L1_S_OFFSET);
limit = L1_S_SIZE - ((vaddr_t)dst & L1_S_OFFSET);
pa = (l1pd & L1_S_FRAME) | (va & L1_S_OFFSET);
size = ((virtual_end - pmap_curmaxkvaddr) + L1_S_OFFSET) / L1_S_SIZE;
((((va) | (pa)) & L1_S_OFFSET) == 0 && (size) >= L1_S_SIZE)
#define L1_S_FRAME (~L1_S_OFFSET)
startpa = bpa & ~L1_S_OFFSET;
endpa = (bpa + size) & ~L1_S_OFFSET;
if ((bpa + size) & L1_S_OFFSET)