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1.1 ! root 1: /* ! 2: * Copyright (c) 1982, 1986 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: * @(#)ht.c 7.1 (Berkeley) 6/5/86 ! 7: */ ! 8: ! 9: /* ! 10: * TM03/TU?? tape driver ! 11: */ ! 12: #include "../machine/pte.h" ! 13: ! 14: #include "../h/param.h" ! 15: #include "../h/inode.h" ! 16: #include "../h/fs.h" ! 17: ! 18: #include "../vaxmba/htreg.h" ! 19: #include "../vaxmba/mbareg.h" ! 20: ! 21: #include "saio.h" ! 22: #include "savax.h" ! 23: ! 24: short httypes[] = ! 25: { MBDT_TM03, MBDT_TE16, MBDT_TU45, MBDT_TU77, 0 }; ! 26: ! 27: #define MASKREG(reg) ((reg)&0xffff) ! 28: ! 29: htopen(io) ! 30: register struct iob *io; ! 31: { ! 32: register int skip; ! 33: register struct htdevice *htaddr = ! 34: (struct htdevice *)mbadrv(io->i_unit); ! 35: int i; ! 36: ! 37: for (i = 0; httypes[i]; i++) ! 38: if (httypes[i] == (htaddr->htdt&MBDT_TYPE)) ! 39: goto found; ! 40: _stop("not a tape\n"); ! 41: found: ! 42: mbainit(UNITTOMBA(io->i_unit)); ! 43: htaddr->htcs1 = HT_DCLR|HT_GO; ! 44: htstrategy(io, HT_REW); ! 45: skip = io->i_boff; ! 46: while (skip--) { ! 47: io->i_cc = -1; ! 48: while (htstrategy(io, HT_SFORW)) ! 49: ; ! 50: DELAY(65536); ! 51: htstrategy(io, HT_SENSE); ! 52: } ! 53: } ! 54: ! 55: htclose(io) ! 56: register struct iob *io; ! 57: { ! 58: ! 59: htstrategy(io, HT_REW); ! 60: } ! 61: ! 62: htstrategy(io, func) ! 63: register struct iob *io; ! 64: int func; ! 65: { ! 66: register int den, errcnt, ds; ! 67: int er; ! 68: short fc; ! 69: register struct htdevice *htaddr = ! 70: (struct htdevice *)mbadrv(io->i_unit); ! 71: ! 72: errcnt = 0; ! 73: retry: ! 74: den = HTTC_1600BPI|HTTC_PDP11; ! 75: htquiet(htaddr); ! 76: htaddr->htcs1 = HT_DCLR|HT_GO; ! 77: htaddr->httc = den; ! 78: htaddr->htfc = -io->i_cc; ! 79: if (func == HT_SREV) { ! 80: htaddr->htfc = -1; ! 81: htaddr->htcs1 = HT_SREV|HT_GO; ! 82: return (0); ! 83: } ! 84: if (func == READ || func == WRITE) ! 85: mbastart(io, func); ! 86: else ! 87: htaddr->htcs1 = func|HT_GO; ! 88: htquiet(htaddr); ! 89: ds = htaddr->htds; ! 90: er = htaddr->hter; ! 91: if (ds & HTDS_TM) { ! 92: htaddr->htcs1 = HT_DCLR|HT_GO; ! 93: return (0); ! 94: } ! 95: if (ds & HTDS_ERR) { ! 96: htaddr->htcs1 = HT_DCLR|HT_GO; ! 97: if ((er & HTER_CORCRC) == 0) { ! 98: printf("ht error: ds=%b, er=%b\n", ! 99: MASKREG(ds), HTDS_BITS, ! 100: MASKREG(er), HTER_BITS); ! 101: if (errcnt == 10) { ! 102: printf("ht: unrecovered error\n"); ! 103: return (-1); ! 104: } ! 105: errcnt++; ! 106: htstrategy(io, HT_SREV); ! 107: goto retry; ! 108: } ! 109: } ! 110: if (errcnt) ! 111: printf("ht: recovered by retry\n"); ! 112: fc = htaddr->htfc; ! 113: return (io->i_cc+fc); ! 114: } ! 115: ! 116: htquiet(htaddr) ! 117: register struct htdevice *htaddr; ! 118: { ! 119: register int s; ! 120: ! 121: do ! 122: s = htaddr->htds; ! 123: while ((s & HTDS_DRY) == 0); ! 124: }
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