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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 7.5 (Berkeley) 4/4/90
7: */
8:
9: /*
10: * TM03/TU?? tape driver
11: */
12: #include "machine/pte.h"
13:
14: #include "param.h"
15:
16: #include "../vaxmba/htreg.h"
17: #include "../vaxmba/mbareg.h"
18:
19: #include "saio.h"
20: #include "savax.h"
21:
22: short httypes[] =
23: { MBDT_TM03, MBDT_TE16, MBDT_TU45, MBDT_TU77, 0 };
24:
25: #define MASKREG(reg) ((reg)&0xffff)
26:
27: htopen(io)
28: register struct iob *io;
29: {
30: register struct htdevice *htaddr;
31: register int i, skip;
32:
33: htaddr = (struct htdevice *)mbadrv(io->i_adapt, io->i_ctlr);
34: if (mbainit(io->i_adapt) == 0)
35: return (EADAPT);
36: for (i = 0;; i++) {
37: if (!httypes[i]) {
38: printf("ht: not a tape\n");
39: return (ENXIO);
40: }
41: if (httypes[i] == (htaddr->htdt&MBDT_TYPE))
42: break;
43: }
44: htaddr->htcs1 = HT_DCLR|HT_GO;
45: htstrategy(io, HT_REW);
46: for (skip = io->i_part; skip--;) {
47: io->i_cc = -1;
48: while (htstrategy(io, HT_SFORW));
49: DELAY(65536);
50: htstrategy(io, HT_SENSE);
51: }
52: return (0);
53: }
54:
55: htclose(io)
56: register struct iob *io;
57: {
58: htstrategy(io, HT_REW);
59: }
60:
61: htstrategy(io, func)
62: register struct iob *io;
63: int func;
64: {
65: register struct htdevice *htaddr;
66: register int den, errcnt, ds;
67: int er;
68: short fc;
69:
70: errcnt = 0;
71: htaddr = (struct htdevice *)mbadrv(io->i_adapt, io->i_ctlr);
72: retry:
73: den = HTTC_1600BPI | HTTC_PDP11 | io->i_unit;
74: htquiet(htaddr);
75: htaddr->htcs1 = HT_DCLR|HT_GO;
76: htaddr->httc = den;
77: htaddr->htfc = -io->i_cc;
78: if (func == HT_SREV) {
79: htaddr->htfc = -1;
80: htaddr->htcs1 = HT_SREV|HT_GO;
81: return (0);
82: }
83: if (func == READ || func == WRITE)
84: mbastart(io, io->i_ctlr, func);
85: else
86: htaddr->htcs1 = func|HT_GO;
87: htquiet(htaddr);
88: ds = htaddr->htds;
89: er = htaddr->hter;
90: if (ds & HTDS_TM) {
91: htaddr->htcs1 = HT_DCLR|HT_GO;
92: return (0);
93: }
94: if (ds & HTDS_ERR) {
95: htaddr->htcs1 = HT_DCLR|HT_GO;
96: if ((er & HTER_CORCRC) == 0) {
97: printf("ht error: ds=%b, er=%b\n",
98: MASKREG(ds), HTDS_BITS,
99: MASKREG(er), HTER_BITS);
100: if (errcnt++ == 10) {
101: printf("ht: unrecovered error\n");
102: return (-1);
103: }
104: htstrategy(io, HT_SREV);
105: goto retry;
106: }
107: }
108: if (errcnt)
109: printf("ht: recovered by retry\n");
110: fc = htaddr->htfc;
111: return (io->i_cc+fc);
112: }
113:
114: static
115: htquiet(htaddr)
116: register struct htdevice *htaddr;
117: {
118: register int s;
119:
120: do
121: s = htaddr->htds;
122: while ((s & HTDS_DRY) == 0);
123: }
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