#/* *//* *   DC-11 driver */#include "../param.h"#include "../conf.h"#include "../user.h"#include "../tty.h"#include "../proc.h"/* * Base address of DC-11's. Minor device  i  is at * DCADDR + 10*i. */#define	DCADDR	0174000/* * Number of DC's for which table space is allocated. */#define	NDC11	14/* * Control bits in device registers */#define	CDLEAD	01#define	CARRIER	04#define	SPEED1	010#define	STOP1	0400#define	RQSEND	01#define	PARITY	040#define	ERROR	0100000#define	CTRANS	040000#define	RINGIND	020000struct	tty dc11[NDC11];struct dcregs {	int dcrcsr;	int dcrbuf;	int dctcsr;	int dctbuf;};/* * Input-side speed and control bit table. * Each DC11 has 4 speeds which correspond to the 4 non-zero entries. * The table index is the same as the speed-selector * number for the DH11. * Attempts to set the speed to a zero entry are ignored. */int dcrstab[] {	0,		/* 0 baud */	0,		/* 50 baud */	0,		/* 75 baud */	0,		/* 110 baud */	01101,		/* 134.5 baud: 7b/ch, speed 0 */	0111,		/* 150 baud: 8b/ch, speed 1 */	0,		/* 200 baud */	0121,		/* 300 baud: 8b/ch, speed 2 */	0,		/* 600 baud */	0131,		/* 1200 baud */	0,		/* 1800 baud */	0,		/* 2400 baud */	0,		/* 4800 baud */	0,		/* 9600 baud */	0,		/* X0 */	0,		/* X1 */};/* * Transmitter speed table */int dctstab[] {	0,		/* 0 baud */	0,		/* 50 baud */	0,		/* 75 baud */	0,		/* 110 baud */	0501,		/* 134.5 baud: stop 1 */	0511,		/* 150 baud */	0,		/* 200 baud */	0521,		/* 300 baud */	0,		/* 600 baud */	0531,		/* 1200 baud */	0,		/* 1800 baud */	0,		/* 2400 baud */	0,		/* 4800 baud */	0,		/* 9600 baud */	0,		/* X0 */	0,		/* X1 */};/* * Open a DC11, waiting until carrier is established. * Default initial conditions are set up on the first open. * t_state's CARR_ON bit is a pure copy of the hardware * CARRIER bit, and is only used to regularize * carrier tests in general tty routines. */dcopen(dev, flag){	register struct tty *rtp;	register *addr;	if (dev.d_minor >= NDC11) {		u.u_error = ENXIO;		return;	}	rtp = &dc11[dev.d_minor];	rtp->t_addr = addr = DCADDR + dev.d_minor*8;	rtp->t_state =| WOPEN;	addr->dcrcsr =| IENABLE|CDLEAD;	if ((rtp->t_state&ISOPEN) == 0) {		rtp->t_erase = CERASE;		rtp->t_kill = CKILL;		addr->dcrcsr = IENABLE|CDLEAD|SPEED1;		addr->dctcsr = IENABLE|SPEED1|STOP1|RQSEND;		rtp->t_state = ISOPEN | WOPEN;		rtp->t_flags = ODDP|EVENP|ECHO;	}	if (addr->dcrcsr & CARRIER)		rtp->t_state =| CARR_ON;	while ((rtp->t_state & CARR_ON) == 0)		sleep(&rtp->t_rawq, TTIPRI);	rtp->t_state =& ~WOPEN;	if (u.u_procp->p_ttyp == 0) {		u.u_procp->p_ttyp = rtp;		rtp->t_dev = dev;	}}/* * Close a dc11 */dcclose(dev){	register struct tty *tp;	(tp = &dc11[dev.d_minor])->t_state = 0;	if (tp->t_flags&HUPCL)		tp->t_addr->dcrcsr =& ~CDLEAD;	wflushtty(tp);}/* * Read a DC11 */dcread(dev){	ttread(&dc11[dev.d_minor]);}/* * Write a DC11 */dcwrite(dev){	ttwrite(&dc11[dev.d_minor]);}/* * DC11 transmitter interrupt. */dcxint(dev){	register struct tty *tp;	ttstart(tp = &dc11[dev.d_minor]);	if (tp->t_outq.c_cc == 0 || tp->t_outq.c_cc == TTLOWAT)		wakeup(&tp->t_outq);}/* * DC11 receiver interrupt. */dcrint(dev){	register struct tty *tp;	register int c, csr;	tp = &dc11[dev.d_minor];	c = tp->t_addr->dcrbuf;	/*	 * If carrier is off, and an open is not in progress,	 * knock down the CD lead to hang up the local dataset	 * and signal a hangup.	 */	if (((csr = tp->t_addr->dcrcsr) & CARRIER) == 0) {		if ((tp->t_state&WOPEN) == 0) {			tp->t_addr->dcrcsr =& ~CDLEAD;			if (tp->t_state & CARR_ON)				signal(tp, SIGHUP);			flushtty(tp);		}		tp->t_state =& ~CARR_ON;		return;	}	if (csr&ERROR || (tp->t_state&ISOPEN)==0) {		if (tp->t_state&WOPEN && csr&CARRIER)			tp->t_state =| CARR_ON;		wakeup(tp);		return;	}	csr =& PARITY;	if (csr&&(tp->t_flags&ODDP) || !csr&&(tp->t_flags&EVENP))		ttyinput(c, tp);}/* * DC11 stty/gtty. * Perform general functions and set speeds. */dcsgtty(dev, av)int *av;{	register struct tty *tp;	register r;	tp = &dc11[dev.d_minor];	if (ttystty(tp, av))		return;	if (r = dcrstab[tp->t_speeds.lobyte&017])		tp->t_addr->dcrcsr = r;	else		tp->t_addr->dcrcsr =& ~CDLEAD;	if (r = dctstab[tp->t_speeds.hibyte&017])		tp->t_addr->dctcsr = r;}