* Do not allow crossing the page boundary.
* Do not allow crossing a page boundary.
badpaddr(caddr_t pa, int size){	vm_offset_t va;	int val;	/*	 * Do not allow crossing the page boundary.	 */	if (((int)pa & PGOFSET) + size > NBPG) {		return -1;	}	va = mapiospace(pa, NBPG);	val = badvaddr(va, size);	unmapiospace(va);	return (val);}