#/* *//* * GP DR11C driver used for C/A/T */#include "../h/param.h"#include "../h/dir.h"#include "../h/user.h"#include "../h/tty.h"#define	CATADDR	((struct catdev *)0167770)#define	PCAT	(PZERO+9)#define	CATHIWAT	100#define	CATLOWAT	30struct {	int	catlock;	struct	clist	oq;} cat;struct catdev {	int	catcsr;	int	catbuf;};ctopen(dev){	if (cat.catlock==0) {		cat.catlock++;		CATADDR->catcsr |= IENABLE;	} else		u.u_error = ENXIO;}ctclose(){	cat.catlock = 0;	catintr();}ctwrite(dev){	register c;	extern lbolt;	while ((c=cpass()) >= 0) {		spl5();		while (cat.oq.c_cc > CATHIWAT)			sleep((caddr_t)&cat.oq, PCAT);		while (putc(c, &cat.oq) < 0)			sleep((caddr_t)&lbolt, PCAT);		catintr();		spl0();	}}catintr(){	register int c;	if (CATADDR->catcsr&DONE) {		if ((c = getc(&cat.oq)) >= 0) {			CATADDR->catbuf = c;			if (cat.oq.c_cc==0 || cat.oq.c_cc==CATLOWAT)				wakeup((caddr_t)&cat.oq);		} else {			if (cat.catlock==0)				CATADDR->catcsr = 0;		}	}}