projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| faeec66d | 1 | /* mt.c 4.4 82/12/17 */ |
| 8d272394 SL |
2 | |
| 3 | /* | |
| 4 | * TM78/TU78 tape driver | |
| 5 | */ | |
| faeec66d | 6 | #include "../machine/pte.h" |
| 8d272394 | 7 | |
| 8d272394 | 8 | #include "../h/param.h" |
| a031a31b | 9 | #include "../h/inode.h" |
| b5d17f4d | 10 | #include "../h/fs.h" |
| a031a31b SL |
11 | |
| 12 | #include "../vaxmba/mtreg.h" | |
| 13 | #include "../vaxmba/mbareg.h" | |
| 14 | ||
| 8d272394 SL |
15 | #include "saio.h" |
| 16 | #include "savax.h" | |
| 17 | ||
| 18 | short mttypes[] = | |
| 19 | { MBDT_TU78, 0 }; | |
| 20 | ||
| 21 | #define MASKREG(reg) ((reg)&0xffff) | |
| 22 | ||
| 23 | mtopen(io) | |
| 24 | register struct iob *io; | |
| 25 | { | |
| 26 | register int skip; | |
| 27 | register struct mtdevice *mtaddr = (struct mtdevice *)mbadrv(io->i_unit); | |
| 28 | int i; | |
| 29 | ||
| 30 | for (i = 0; mttypes[i]; i++) | |
| 31 | if (mttypes[i] == (mtaddr->mtdt&MBDT_TYPE)) | |
| 32 | goto found; | |
| 33 | _stop("not a tape\n"); | |
| 34 | found: | |
| 35 | mbainit(UNITTOMBA(io->i_unit)); | |
| 36 | mtaddr->mtid = MTID_CLR; | |
| 37 | DELAY(250); | |
| 38 | while ((mtaddr->mtid & MTID_RDY) == 0) | |
| 39 | ; | |
| 40 | mtstrategy(io, MT_REW); | |
| 41 | skip = io->i_boff; | |
| 42 | while (skip--) { | |
| 43 | io->i_cc = -1; | |
| 44 | mtstrategy(io, MT_SFORWF); | |
| 45 | } | |
| 46 | } | |
| 47 | ||
| 48 | mtclose(io) | |
| 49 | register struct iob *io; | |
| 50 | { | |
| 51 | ||
| 52 | mtstrategy(io, MT_REW); | |
| 53 | } | |
| 54 | ||
| 55 | mtstrategy(io, func) | |
| 56 | register struct iob *io; | |
| 57 | int func; | |
| 58 | { | |
| 59 | register int errcnt, s, ic; | |
| 60 | register struct mtdevice *mtaddr = | |
| 61 | (struct mtdevice *)mbadrv(io->i_unit); | |
| 62 | ||
| 63 | errcnt = 0; | |
| 64 | retry: | |
| 65 | if (func == READ || func == WRITE) { | |
| 66 | mtaddr->mtca = 1<<2; /* 1 record */ | |
| 67 | mtaddr->mtbc = io->i_cc; | |
| 68 | mtaddr->mter = 0; | |
| 69 | mbastart(io, func); | |
| 70 | do | |
| 71 | s = mtaddr->mter & MTER_INTCODE; | |
| 72 | while (s == 0); | |
| 73 | ic = s; | |
| 74 | DELAY(2000); | |
| 75 | } else { | |
| 76 | mtaddr->mtas = -1; | |
| 77 | mtaddr->mtncs[0] = (-io->i_cc << 8)|func|MT_GO; | |
| 78 | rwait: | |
| 79 | do | |
| 80 | s = mtaddr->mtas&0xffff; | |
| 81 | while (s == 0); | |
| 82 | mtaddr->mtas = mtaddr->mtas; /* clear attention */ | |
| 83 | ic = mtaddr->mtner & MTER_INTCODE; | |
| 84 | } | |
| 85 | switch (ic) { | |
| 86 | case MTER_TM: | |
| 87 | case MTER_EOT: | |
| 88 | case MTER_LEOT: | |
| 89 | return (0); | |
| 90 | ||
| 91 | case MTER_DONE: | |
| 92 | break; | |
| 93 | ||
| 94 | case MTER_RWDING: | |
| 95 | goto rwait; | |
| 96 | default: | |
| 97 | printf("mt hard error: er=%b\n", | |
| 98 | MASKREG(mtaddr->mter)); | |
| 99 | mtaddr->mtid = MTID_CLR; | |
| 100 | DELAY(250); | |
| 101 | while ((mtaddr->mtid & MTID_RDY) == 0) | |
| 102 | ; | |
| 103 | return (-1); | |
| 104 | ||
| 105 | case MTER_RETRY: | |
| 106 | printf("mt error: er=%b\n", | |
| 107 | MASKREG(mtaddr->mter)); | |
| 108 | if (errcnt == 10) { | |
| 109 | printf("mt: unrecovered error\n"); | |
| 110 | return (-1); | |
| 111 | } | |
| 112 | errcnt++; | |
| 113 | goto retry; | |
| 114 | } | |
| 115 | if (errcnt) | |
| 116 | printf("mt: recovered by retry\n"); | |
| 117 | return (io->i_cc); /* NO PARTIAL RECORD READS!!! */ | |
| 118 | } |