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Annotation of 43BSDTahoe/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        7.5 (Berkeley) 7/9/88
                      7:  */
                      8: 
                      9: /*
                     10:  * TM11/TE??
                     11:  */
                     12: 
                     13: #include "param.h"
                     14: #include "inode.h"
                     15: #include "fs.h"
                     16: 
                     17: #include "../vax/pte.h"
                     18: 
                     19: #include "../vaxuba/ubareg.h"
                     20: #include "../vaxuba/tmreg.h"
                     21: 
                     22: #include "saio.h"
                     23: #include "savax.h"
                     24: 
                     25: #define        MAXCTLR         1               /* all addresses must be specified */
                     26: u_short        tmstd[MAXCTLR] = { 0172520 };
                     27: 
                     28: tmopen(io)
                     29:        register struct iob *io;
                     30: {
                     31:        register int skip;
                     32: 
                     33:        if ((u_int)io->i_adapt >= nuba)
                     34:                return (EADAPT);
                     35:        if ((u_int)io->i_ctlr >= MAXCTLR)
                     36:                return (ECTLR);
                     37:        if (badaddr((char *)ubamem(io->i_adapt, tmstd[io->i_ctlr]), sizeof(short)))
                     38:                return (ENXIO);
                     39:        tmstrategy(io, TM_REW);
                     40:        for (skip = io->i_part; skip--;) {
                     41:                io->i_cc = 0;
                     42:                tmstrategy(io, TM_SFORW);
                     43:        }
                     44:        return (0);
                     45: }
                     46: 
                     47: tmclose(io)
                     48:        register struct iob *io;
                     49: {
                     50:        tmstrategy(io, TM_REW);
                     51: }
                     52: 
                     53: tmstrategy(io, func)
                     54:        register struct iob *io;
                     55: {
                     56:        register int com, errcnt;
                     57:        register struct tmdevice *tmaddr;
                     58:        int word, info;
                     59: 
                     60:        tmaddr = (struct tmdevice *)ubamem(io->i_adapt, tmstd[io->i_ctlr]);
                     61:        errcnt = 0;
                     62: retry:
                     63:        tmquiet(tmaddr);
                     64:        info = ubasetup(io, 1);
                     65:        tmaddr->tmbc = -io->i_cc;
                     66:        tmaddr->tmba = info;
                     67:        com = (io->i_unit<<8) | TM_GO;
                     68:        if (func == READ)
                     69:                tmaddr->tmcs = com | TM_RCOM;
                     70:        else if (func == WRITE)
                     71:                tmaddr->tmcs = com | TM_WCOM;
                     72:        else if (func == TM_SREV) {
                     73:                tmaddr->tmbc = -1;
                     74:                tmaddr->tmcs = com | TM_SREV;
                     75:                return (0);
                     76:        } else
                     77:                tmaddr->tmcs = com | func;
                     78:        for (;;) {
                     79:                word = tmaddr->tmcs;
                     80:                DELAY(100);
                     81:                if (word & TM_CUR)
                     82:                        break;
                     83:        }
                     84:        ubafree(io, info);
                     85:        word = tmaddr->tmer;
                     86:        if (word & TMER_EOT)
                     87:                return (0);
                     88:        if (word & TM_ERR) {
                     89:                if (word & TMER_EOF)
                     90:                        return (0);
                     91:                printf("tm tape error: er=%b\n", word, TMER_BITS);
                     92:                if (errcnt++ == 10) {
                     93:                        printf("tm: unrecovered error\n");
                     94:                        return (-1);
                     95:                }
                     96:                tmstrategy(io, TM_SREV);
                     97:                goto retry;
                     98:        }
                     99:        if (errcnt)
                    100:                printf("tm: recovered by retry\n");
                    101:        if (word & TMER_EOF)
                    102:                return (0);
                    103:        return (io->i_cc + tmaddr->tmbc);
                    104: }
                    105: 
                    106: tmquiet(tmaddr)
                    107:        register struct tmdevice *tmaddr;
                    108: {
                    109:        register word;
                    110:        for (;;) {
                    111:                word = tmaddr->tmcs;
                    112:                DELAY(100);
                    113:                if (word&TM_CUR)
                    114:                        break;
                    115:        }
                    116:        for (;;) {
                    117:                word = tmaddr->tmer;
                    118:                DELAY(100);
                    119:                if ((word&TMER_TUR) && (word&TMER_SDWN)==0)
                    120:                        break;
                    121:        }
                    122: }

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