ZTWOROMTOP
while (pg_proto < ZTWOROMTOP) {
#define NZTWOROMPG btoc(ZTWOROMTOP-ZTWOROMBASE)
(ZTWOROMADDR + ZTWOROMTOP - ZTWOROMBASE))
#define isztwopa(pa) ((u_int)(pa) >= ZTWOROMBASE && (u_int)(pa) <= ZTWOROMTOP)