PMAP_INVALID_SEGTAB_ADDRESS
ci->ci_pmap_user_segtab = PMAP_INVALID_SEGTAB_ADDRESS;
ci->ci_pmap_user_seg0tab = PMAP_INVALID_SEGTAB_ADDRESS;
curcpu()->ci_pmap_user_segtab = PMAP_INVALID_SEGTAB_ADDRESS;