pteaddr = &Usrptma[btokmx(mproc->p_p0br) + mproc->p_szpt - 1];
klseek(kmem, (long)pteaddr, L_SET);
if (read(kmem, (char *)&apte, sizeof (apte)) != sizeof (apte)) {
pteaddr = &Usrptma[btokmx(mproc->p_p0br) + mproc->p_szpt - 1];
klseek(kmem, (long)pteaddr, L_SET);
if (read(kmem, (char *)&apte, sizeof (apte)) != sizeof (apte)) {