projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 32ce6f5e BJ |
1 | /* tm.c 4.1 %G% */ |
| 2 | /* | |
| 3 | * TM tape driver | |
| 4 | */ | |
| 5 | ||
| 6 | #include "../h/param.h" | |
| 7 | #include "../h/inode.h" | |
| 8 | #include "../h/pte.h" | |
| 9 | #include "../h/uba.h" | |
| 10 | #include "saio.h" | |
| 11 | ||
| 12 | struct device { | |
| 13 | short tmer; | |
| 14 | short tmcs; | |
| 15 | short tmbc; | |
| 16 | u_short tmba; | |
| 17 | short tmdb; | |
| 18 | short tmrd; | |
| 19 | }; | |
| 20 | ||
| 21 | #define TMADDR ((struct device *)(PHYSUMEM + 0772520 - UNIBASE)) | |
| 22 | ||
| 23 | #define GO 01 | |
| 24 | #define RCOM 02 | |
| 25 | #define WCOM 04 | |
| 26 | #define WEOF 06 | |
| 27 | #define SFORW 010 | |
| 28 | #define SREV 012 | |
| 29 | #define WIRG 014 | |
| 30 | #define REW 016 | |
| 31 | #define DENS 060000 /* 9-channel */ | |
| 32 | #define IENABLE 0100 | |
| 33 | #define CRDY 0200 | |
| 34 | #define GAPSD 010000 | |
| 35 | #define TUR 1 | |
| 36 | #define SDWN 010 | |
| 37 | #define HARD 0102200 /* ILC, EOT, NXM */ | |
| 38 | #define EOF 0040000 | |
| 39 | ||
| 40 | #define SSEEK 1 | |
| 41 | #define SIO 2 | |
| 42 | ||
| 43 | tmopen(io) | |
| 44 | register struct iob *io; | |
| 45 | { | |
| 46 | register skip; | |
| 47 | ||
| 48 | tmstrategy(io, REW); | |
| 49 | skip = io->i_boff; | |
| 50 | while (skip--) { | |
| 51 | io->i_cc = 0; | |
| 52 | while (tmstrategy(io, SFORW)) | |
| 53 | ; | |
| 54 | } | |
| 55 | } | |
| 56 | ||
| 57 | tmclose(io) | |
| 58 | register struct iob *io; | |
| 59 | { | |
| 60 | tmstrategy(io, REW); | |
| 61 | } | |
| 62 | ||
| 63 | tmstrategy(io, func) | |
| 64 | register struct iob *io; | |
| 65 | { | |
| 66 | register int com, unit, errcnt; | |
| 67 | int info; | |
| 68 | ||
| 69 | unit = io->i_unit; | |
| 70 | errcnt = 0; | |
| 71 | retry: | |
| 72 | tmquiet(); | |
| 73 | com = (unit<<8)|DENS; | |
| 74 | info = ubasetup(io, 1); | |
| 75 | TMADDR->tmbc = -io->i_cc; | |
| 76 | TMADDR->tmba = info; | |
| 77 | if (func == READ) | |
| 78 | TMADDR->tmcs = com | RCOM | GO; | |
| 79 | else if (func == WRITE) | |
| 80 | TMADDR->tmcs = com | WCOM | GO; | |
| 81 | else if (func == SREV) { | |
| 82 | TMADDR->tmbc = -1; | |
| 83 | TMADDR->tmcs = com | SREV | GO; | |
| 84 | return(0); | |
| 85 | } else | |
| 86 | TMADDR->tmcs = com | func | GO; | |
| 87 | while ((TMADDR->tmcs&CRDY) == 0) | |
| 88 | ; | |
| 89 | ubafree(info); | |
| 90 | if (TMADDR->tmer&EOF) | |
| 91 | return(0); | |
| 92 | if (TMADDR->tmer < 0) { | |
| 93 | if (errcnt == 0) | |
| 94 | printf("tape error: er=%o", TMADDR->tmer); | |
| 95 | if (errcnt==10) { | |
| 96 | printf("\n"); | |
| 97 | return(-1); | |
| 98 | } | |
| 99 | errcnt++; | |
| 100 | tmstrategy(io, SREV); | |
| 101 | goto retry; | |
| 102 | } | |
| 103 | if (errcnt) | |
| 104 | printf(" recovered by retry\n"); | |
| 105 | return( io->i_cc+TMADDR->tmbc ); | |
| 106 | } | |
| 107 | ||
| 108 | tmquiet() | |
| 109 | { | |
| 110 | while ((TMADDR->tmcs&CRDY) == 0) | |
| 111 | ; | |
| 112 | while ((TMADDR->tmer&TUR) == 0) | |
| 113 | ; | |
| 114 | while ((TMADDR->tmer&SDWN) != 0) | |
| 115 | ; | |
| 116 | } |