PAGE_MASK_L2
kern_start_2m_va = (vaddr_t)&start & ~(PAGE_MASK_L2);
kern_end_2m_va = (vaddr_t)&end & ~(PAGE_MASK_L2);
*pap = (pte & pg_lgframe) | (va & PAGE_MASK_L2);
off = pa & PAGE_MASK_L2;
kern_start_4m_va = (vaddr_t)&start & ~(PAGE_MASK_L2);
kern_end_4m_va = (vaddr_t)&end & ~(PAGE_MASK_L2);
image_start &= ~(PAGE_MASK_L2);
image_end &= ~(PAGE_MASK_L2);