#/* *//* *	DM-BB driver */#include "../param.h"#include "../tty.h"#include "../conf.h"#define	DMADDR	0170500struct	tty dh11[];int	ndh11;		/* Set by dh.c to number of lines */#define	DONE	0200#define	SCENABL	040#define	CLSCAN	01000#define	TURNON	07	/* RQ send, CD lead, line enable */#define	TURNOFF	1	/* line enable only */#define	CARRIER	0100struct dmregs {	int	dmcsr;	int	dmlstat;};/* * Turn on the line associated with the (DH) device dev. */dmopen(dev){	register struct tty *tp;	tp = &dh11[dev.d_minor];	DMADDR->dmcsr = dev.d_minor;	DMADDR->dmlstat = TURNON;	if (DMADDR->dmlstat&CARRIER)		tp->t_state =| CARR_ON;	DMADDR->dmcsr = IENABLE|SCENABL;	spl5();	while ((tp->t_state&CARR_ON)==0)		sleep(&tp->t_rawq, TTIPRI);	spl0();}/* * If a DH line has the HUPCL mode, * turn off carrier when it is closed. */dmclose(dev){	register struct tty *tp;	tp = &dh11[dev.d_minor];	if (tp->t_flags&HUPCL) {		DMADDR->dmcsr = dev.d_minor;		DMADDR->dmlstat = TURNOFF;		DMADDR->dmcsr = IENABLE|SCENABL;	}}/* * DM11 interrupt. * Mainly, deal with carrier transitions. */dmint(){	register struct tty *tp;	if (DMADDR->dmcsr&DONE) {		tp = &dh11[DMADDR->dmcsr&017];		if (tp < &dh11[ndh11]) {			wakeup(tp);			if ((DMADDR->dmlstat&CARRIER)==0) {				if ((tp->t_state&WOPEN)==0) {					signal(tp, SIGHUP);					DMADDR->dmlstat = 0;					flushtty(tp);				}				tp->t_state =& ~CARR_ON;			} else				tp->t_state =| CARR_ON;		}		DMADDR->dmcsr = IENABLE|SCENABL;	}}