L1_S_FRAME
curaddr = (*pde & L1_S_FRAME) |
pgva = (vaddr_t)dst & L1_S_FRAME;
pa = (l1pd & L1_S_FRAME) | (va & L1_S_OFFSET);
#define L2_NEXT_BUCKET(va) (((va) & L1_S_FRAME) + L1_S_SIZE)