i386_round_page
dump_avail_off = I386_PAGE_SIZE + i386_round_page(vmst->hdr.msgbufsize);
off = dump_avail_off + i386_round_page(vmst->hdr.dumpavailsize);
sparse_off = off + i386_round_page(vmst->hdr.bitmapsize) +
i386_round_page(vmst->hdr.ptesize);
off += i386_round_page(vmst->hdr.bitmapsize);
off += i386_round_page(vmst->hdr.ptesize);