Commit | Line | Data |
---|---|---|
1edcc975 | 1 | /* ht.c 4.7 82/03/07 */ |
fbfcdb0a BJ |
2 | |
3 | /* | |
2d19f71b | 4 | * TM03/TU?? tape driver |
fbfcdb0a BJ |
5 | */ |
6 | ||
2d19f71b | 7 | #include "../h/htreg.h" |
fbfcdb0a BJ |
8 | #include "../h/param.h" |
9 | #include "../h/inode.h" | |
f7acbdcc | 10 | #include "../h/pte.h" |
2d19f71b | 11 | #include "../h/mbareg.h" |
1edcc975 | 12 | #include "../h/fs.h" |
fbfcdb0a | 13 | #include "saio.h" |
2d19f71b | 14 | #include "savax.h" |
fbfcdb0a | 15 | |
10899d3a BJ |
16 | short httypes[] = |
17 | { MBDT_TM03, MBDT_TE16, MBDT_TU45, MBDT_TU77, 0 }; | |
18 | ||
19 | #define MASKREG(reg) ((reg)&0xffff) | |
20 | ||
fbfcdb0a | 21 | htopen(io) |
2d19f71b | 22 | register struct iob *io; |
fbfcdb0a | 23 | { |
2d19f71b BJ |
24 | register int skip; |
25 | register struct htdevice *htaddr = (struct htdevice *)mbadrv(io->i_unit); | |
fbfcdb0a BJ |
26 | int i; |
27 | ||
10899d3a BJ |
28 | for (i = 0; httypes[i]; i++) |
29 | if (httypes[i] == (htaddr->htdt&MBDT_TYPE)) | |
30 | goto found; | |
31 | _stop("not a tape\n"); | |
32 | found: | |
2d19f71b BJ |
33 | mbainit(UNITTOMBA(io->i_unit)); |
34 | htaddr->htcs1 = HT_DCLR|HT_GO; | |
35 | htstrategy(io, HT_REW); | |
fbfcdb0a BJ |
36 | skip = io->i_boff; |
37 | while (skip--) { | |
38 | io->i_cc = -1; | |
2d19f71b | 39 | while (htstrategy(io, HT_SFORW)) |
fbfcdb0a | 40 | ; |
2d19f71b BJ |
41 | DELAY(65536); |
42 | htstrategy(io, HT_SENSE); | |
fbfcdb0a BJ |
43 | } |
44 | } | |
45 | ||
46 | htclose(io) | |
2d19f71b | 47 | register struct iob *io; |
fbfcdb0a | 48 | { |
2d19f71b BJ |
49 | |
50 | htstrategy(io, HT_REW); | |
fbfcdb0a BJ |
51 | } |
52 | ||
53 | htstrategy(io, func) | |
2d19f71b BJ |
54 | register struct iob *io; |
55 | int func; | |
fbfcdb0a | 56 | { |
2d19f71b | 57 | register int den, errcnt, ds; |
cc00b603 | 58 | int er; |
fbfcdb0a | 59 | short fc; |
2d19f71b BJ |
60 | register struct htdevice *htaddr = |
61 | (struct htdevice *)mbadrv(io->i_unit); | |
fbfcdb0a | 62 | |
fbfcdb0a BJ |
63 | errcnt = 0; |
64 | retry: | |
2d19f71b BJ |
65 | den = HTTC_1600BPI|HTTC_PDP11; |
66 | htquiet(htaddr); | |
10899d3a | 67 | htaddr->htcs1 = HT_DCLR|HT_GO; |
2d19f71b BJ |
68 | htaddr->httc = den; |
69 | htaddr->htfc = -io->i_cc; | |
70 | if (func == HT_SREV) { | |
71 | htaddr->htfc = -1; | |
72 | htaddr->htcs1 = HT_SREV|HT_GO; | |
73 | return (0); | |
fbfcdb0a | 74 | } |
610c6f01 | 75 | if (func == READ || func == WRITE) |
2d19f71b | 76 | mbastart(io, func); |
fbfcdb0a | 77 | else |
2d19f71b BJ |
78 | htaddr->htcs1 = func|HT_GO; |
79 | htquiet(htaddr); | |
80 | ds = htaddr->htds; | |
cc00b603 | 81 | er = htaddr->hter; |
2d19f71b BJ |
82 | if (ds & HTDS_TM) { |
83 | htaddr->htcs1 = HT_DCLR|HT_GO; | |
84 | return (0); | |
fbfcdb0a | 85 | } |
2d19f71b | 86 | if (ds & HTDS_ERR) { |
2d19f71b | 87 | htaddr->htcs1 = HT_DCLR|HT_GO; |
cc00b603 BJ |
88 | if ((er & HTER_CORCRC) == 0) { |
89 | printf("ht error: ds=%b, er=%b\n", | |
90 | MASKREG(ds), HTDS_BITS, | |
91 | MASKREG(er), HTER_BITS); | |
92 | if (errcnt == 10) { | |
93 | printf("ht: unrecovered error\n"); | |
94 | return (-1); | |
95 | } | |
96 | errcnt++; | |
97 | htstrategy(io, HT_SREV); | |
98 | goto retry; | |
fbfcdb0a | 99 | } |
fbfcdb0a BJ |
100 | } |
101 | if (errcnt) | |
10899d3a | 102 | printf("ht: recovered by retry\n"); |
2d19f71b BJ |
103 | fc = htaddr->htfc; |
104 | return (io->i_cc+fc); | |
fbfcdb0a BJ |
105 | } |
106 | ||
2d19f71b BJ |
107 | htquiet(htaddr) |
108 | register struct htdevice *htaddr; | |
fbfcdb0a BJ |
109 | { |
110 | register int s; | |
111 | ||
112 | do | |
2d19f71b BJ |
113 | s = htaddr->htds; |
114 | while ((s & HTDS_DRY) == 0); | |
e63bbd8c | 115 | } |
cc00b603 BJ |
116 | |
117 |