it's a kludge, so keep based on the machine name

[unix-history] / usr / src / sys / vax / stand / ts.c

/*      ts.c    4.4     81/12/01        */

/*
* TS11 tape driver
*/

#include "../h/param.h"
#include "../h/tsreg.h"
#include "../h/inode.h"
#include "../h/pte.h"
#include "../h/ubareg.h"
#include "saio.h"
#include "savax.h"


u_short tsstd[] = { 0772520 };

struct  iob     ctsbuf;

u_short ts_uba;                 /* Unibus address of ts structure */

struct tsdevice *tsaddr = 0;

struct ts {
       struct ts_cmd ts_cmd;
       struct ts_char ts_char;
       struct ts_sts ts_sts;
} ts;

tsopen(io)
       register struct iob *io;
{
       static struct ts *ts_ubaddr;
       long i = 0;

       if (tsaddr == 0)
               tsaddr = ubamem(io->i_unit, tsstd[0]);
       tsaddr->tssr = 0;
       while ((tsaddr->tssr & TS_SSR)==0) {
               if (++i > 1000000) {
                       printf("ts: not ready\n");
                       return;
               }
       }
       if (tsaddr->tssr&TS_OFL) {
               printf("ts: offline\n");
               return;
       }
       if (tsaddr->tssr&TS_NBA) {
               int i;

               ctsbuf.i_ma = (caddr_t) &ts;
               ctsbuf.i_cc = sizeof(ts);
               if (ts_ubaddr == 0)
                       ts_ubaddr = (struct ts *)ubasetup(&ctsbuf, 2);
               ts_uba = (u_short)((long)ts_ubaddr + (((long)ts_ubaddr>>16)&03));
               ts.ts_char.char_addr = (int)&ts_ubaddr->ts_sts;
               ts.ts_char.char_size = sizeof(ts.ts_sts);
               ts.ts_char.char_mode = TS_ESS;
               ts.ts_cmd.c_cmd = TS_ACK|TS_SETCHR;
               i = (int)&ts_ubaddr->ts_char;
               ts.ts_cmd.c_loba = i;
               ts.ts_cmd.c_hiba = (i>>16)&3;
               ts.ts_cmd.c_size = sizeof(ts.ts_char);
               tsaddr->tsdb = ts_uba;
       }
       tsstrategy(io, TS_REW);
       if (io->i_cc = io->i_boff)
               tsstrategy(io, TS_SFORWF);
}

tsclose(io)
       register struct iob *io;
{

       tsstrategy(io, TS_REW);
}

tsstrategy(io, func)
       register struct iob *io;
{
       register int errcnt, info = 0;

       errcnt = 0;
retry:
       while ((tsaddr->tssr & TS_SSR) == 0)
               DELAY(100);
       if (func == TS_REW || func == TS_SFORWF)
               ts.ts_cmd.c_repcnt = io->i_cc;
       else {
               info = ubasetup(io, 1);
               ts.ts_cmd.c_size = io->i_cc;
               ts.ts_cmd.c_loba = info;
               ts.ts_cmd.c_hiba = (info>>16)&3;
       }
       if (func == READ)
               func = TS_RCOM;
       else if (func == WRITE)
               func = TS_WCOM;
       ts.ts_cmd.c_cmd = TS_ACK|TS_CVC|func;
       tsaddr->tsdb = ts_uba;
       do
               DELAY(100)
       while ((tsaddr->tssr & TS_SSR) == 0);
       if (info)
               ubafree(io, info);
       if (ts.ts_sts.s_xs0 & TS_TMK)
               return (0);
       if (tsaddr->tssr & TS_SC) {
               printf("ts tape error: er=%b, xs0=%b",
                   tsaddr->tssr, TSSR_BITS,
                   ts.ts_sts.s_xs0, TSXS0_BITS);
               if (errcnt==10) {
                       printf("ts: unrecovered error\n");
                       return (-1);
               }
               errcnt++;
               if (func == TS_RCOM || func == TS_WCOM)
                       func |= TS_RETRY;
               goto retry;
       }
       if (errcnt)
               printf("ts: recovered by retry\n");
       return (io->i_cc - ts.ts_sts.s_rbpcr);
}