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Annotation of 43BSDTahoe/sys/vaxstand/tm.c, revision 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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