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[unix-history] / usr / src / sys / vax / uba / ct.c

/*      ct.c    4.1     81/02/23        */

#include "cat.h"
#if NCT > 0
/*
* GP DR11C driver used for C/A/T
*/

#include "../h/param.h"
#include "../h/tty.h"
#include "../h/pte.h"
#include "../h/map.h"
#include "../h/uba.h"
#include "../h/buf.h"
#include "../h/conf.h"
#include "../h/dir.h"
#include "../h/user.h"

#define PCAT    (PZERO+9)
#define CATHIWAT        100
#define CATLOWAT        30

struct {
       int     catlock;
       struct  clist   oq;
} cat;

struct device {
       short   catcsr;
       short   catbuf;
};

int ctintr();

ctopen(dev)
{
       if (cat.catlock==0) {
               cat.catlock++;
               CATADDR->catcsr |= IENABLE;
       } else
               u.u_error = ENXIO;
}

ctclose()
{
       cat.catlock = 0;
       ctintr();
}

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);
               ctintr();
               spl0();
       }
}

ctintr()
{
       register int c;

       if (CATADDR->catcsr&DONE) {
               if ((c = getc(&cat.oq)) >= 0) {
#if MH135A
                       c |= (c & 01) << 8;     /* for dr11c bug */
#endif          
                       CATADDR->catbuf = c;
                       if (cat.oq.c_cc==0 || cat.oq.c_cc==CATLOWAT)
                               wakeup(&cat.oq);
               } else {
                       if (cat.catlock==0)
                               CATADDR->catcsr = 0;
               }
       }

}
#endif