round_page64
oldpages = round_page64(oldsize) / PAGE_SIZE;
newpages = round_page64(newsize) / PAGE_SIZE;
OFF_TO_IDX(round_page64(offset + size)));
size = round_page64(size);
size = round_page64(size);
phys_avail[i].phys_beg = round_page64(phys_avail[i].phys_beg);
lsize = OFF_TO_IDX(round_page64(loffset));