Bell 32V development

[unix-history] / usr / src / sys / dev / dn.c

/*
* DN-11 ACU interface
*/

#include "../h/param.h"
#include "../h/dir.h"
#include "../h/user.h"
#include "../h/uba.h"

struct device {
       short   dn_reg[4];
};

struct device *dn_addr[] = { (struct device *)(UBA0_DEV+0175200) };
#define NDN     4

#define PWI     0100000
#define ACR     040000
#define DLO     010000
#define DONE    0200
#define IENABLE 0100
#define DSS     040
#define PND     020
#define MENABLE 04
#define DPR     02
#define CRQ     01

#define DNPRI   (PZERO+5)

dnopen(dev)
register dev;
{
       register struct device *dp;

       dev = minor(dev);
       if (dev >= NDN ||
          (dp = dn_addr[dev>>2])->dn_reg[dev&03]&(PWI|DLO|CRQ))
               u.u_error = ENXIO;
       else {
               dp->dn_reg[0] |= MENABLE;
               dp->dn_reg[dev&03] = IENABLE|MENABLE|CRQ;
       }
}

dnclose(dev)
{
       dev = minor(dev);
       dn_addr[dev>>2]->dn_reg[dev&03] = MENABLE;
}

dnwrite(dev)
{
       register c;
       register short *dp;
       extern lbolt;

       dev = minor(dev);
       dp = &(dn_addr[dev>>2]->dn_reg[dev&03]);
       while ((*dp & (PWI|ACR|DSS)) == 0) {
               spl4();
               if ((*dp&PND) == 0 || u.u_count == 0 || (c=cpass()) < 0)
                       sleep(dp, DNPRI);
               else if (c == '-') {
                       sleep(&lbolt, DNPRI);
                       sleep(&lbolt, DNPRI);
               } else {
                       *dp = (c<<8)|IENABLE|MENABLE|DPR|CRQ;
                       sleep(dp, DNPRI);
               }
               spl0();
       }
       if (*dp&(PWI|ACR))
               u.u_error = EIO;
}

/*
* interrupt-- "dev" applies to
* system unit number, not minor device
*/
dnint(dev)
{
       register short *dp,*ep;

       dp = &(dn_addr[dev]->dn_reg[0]);
       *dp &= ~MENABLE;
       for (ep=dp; ep<dp+4; ep++)
               if (*ep&DONE) {
                       *ep &= ~DONE;
                       wakeup(ep);
               }
       *dp |= MENABLE;
}