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Annotation of 43BSDReno/sys/vaxstand/tm.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
                      3:  * All rights reserved.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  *
                      6:  *     @(#)tm.c        7.6 (Berkeley) 4/4/90
                      7:  */
                      8: 
                      9: /*
                     10:  * TM11/TE??
                     11:  */
                     12: 
                     13: #include "param.h"
                     14: 
                     15: #include "../vax/pte.h"
                     16: 
                     17: #include "../vaxuba/ubareg.h"
                     18: #include "../vaxuba/tmreg.h"
                     19: 
                     20: #include "saio.h"
                     21: #include "savax.h"
                     22: 
                     23: #define        MAXCTLR         1               /* all addresses must be specified */
                     24: u_short        tmstd[MAXCTLR] = { 0172520 };
                     25: 
                     26: tmopen(io)
                     27:        register struct iob *io;
                     28: {
                     29:        register int skip;
                     30: 
                     31:        if ((u_int)io->i_adapt >= nuba)
                     32:                return (EADAPT);
                     33:        if ((u_int)io->i_ctlr >= MAXCTLR)
                     34:                return (ECTLR);
                     35:        if (badaddr((char *)ubamem(io->i_adapt, tmstd[io->i_ctlr]), sizeof(short)))
                     36:                return (ENXIO);
                     37:        tmstrategy(io, TM_REW);
                     38:        for (skip = io->i_part; skip--;) {
                     39:                io->i_cc = 0;
                     40:                tmstrategy(io, TM_SFORW);
                     41:        }
                     42:        return (0);
                     43: }
                     44: 
                     45: tmclose(io)
                     46:        register struct iob *io;
                     47: {
                     48:        tmstrategy(io, TM_REW);
                     49: }
                     50: 
                     51: tmstrategy(io, func)
                     52:        register struct iob *io;
                     53: {
                     54:        register int com, errcnt;
                     55:        register struct tmdevice *tmaddr;
                     56:        int word, info;
                     57: 
                     58:        tmaddr = (struct tmdevice *)ubamem(io->i_adapt, tmstd[io->i_ctlr]);
                     59:        errcnt = 0;
                     60: retry:
                     61:        tmquiet(tmaddr);
                     62:        info = ubasetup(io, 1);
                     63:        tmaddr->tmbc = -io->i_cc;
                     64:        tmaddr->tmba = info;
                     65:        com = (io->i_unit<<8) | TM_GO;
                     66:        if (func == READ)
                     67:                tmaddr->tmcs = com | TM_RCOM;
                     68:        else if (func == WRITE)
                     69:                tmaddr->tmcs = com | TM_WCOM;
                     70:        else if (func == TM_SREV) {
                     71:                tmaddr->tmbc = -1;
                     72:                tmaddr->tmcs = com | TM_SREV;
                     73:                return (0);
                     74:        } else
                     75:                tmaddr->tmcs = com | func;
                     76:        for (;;) {
                     77:                word = tmaddr->tmcs;
                     78:                DELAY(100);
                     79:                if (word & TM_CUR)
                     80:                        break;
                     81:        }
                     82:        ubafree(io, info);
                     83:        word = tmaddr->tmer;
                     84:        if (word & TMER_EOT)
                     85:                return (0);
                     86:        if (word & TM_ERR) {
                     87:                if (word & TMER_EOF)
                     88:                        return (0);
                     89:                printf("tm tape error: er=%b\n", word, TMER_BITS);
                     90:                if (errcnt++ == 10) {
                     91:                        printf("tm: unrecovered error\n");
                     92:                        return (-1);
                     93:                }
                     94:                tmstrategy(io, TM_SREV);
                     95:                goto retry;
                     96:        }
                     97:        if (errcnt)
                     98:                printf("tm: recovered by retry\n");
                     99:        if (word & TMER_EOF)
                    100:                return (0);
                    101:        return (io->i_cc + tmaddr->tmbc);
                    102: }
                    103: 
                    104: tmquiet(tmaddr)
                    105:        register struct tmdevice *tmaddr;
                    106: {
                    107:        register word;
                    108:        for (;;) {
                    109:                word = tmaddr->tmcs;
                    110:                DELAY(100);
                    111:                if (word&TM_CUR)
                    112:                        break;
                    113:        }
                    114:        for (;;) {
                    115:                word = tmaddr->tmer;
                    116:                DELAY(100);
                    117:                if ((word&TMER_TUR) && (word&TMER_SDWN)==0)
                    118:                        break;
                    119:        }
                    120: }

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