1 /* ht.c 4.5 81/03/22 */ 2 3 /* 4 * TM03/TU?? tape driver 5 */ 6 7 #include "../h/htreg.h" 8 #include "../h/param.h" 9 #include "../h/inode.h" 10 #include "../h/pte.h" 11 #include "../h/mbareg.h" 12 #include "saio.h" 13 #include "savax.h" 14 15 short httypes[] = 16 { MBDT_TM03, MBDT_TE16, MBDT_TU45, MBDT_TU77, 0 }; 17 18 #define MASKREG(reg) ((reg)&0xffff) 19 20 htopen(io) 21 register struct iob *io; 22 { 23 register int skip; 24 register struct htdevice *htaddr = (struct htdevice *)mbadrv(io->i_unit); 25 int i; 26 27 for (i = 0; httypes[i]; i++) 28 if (httypes[i] == (htaddr->htdt&MBDT_TYPE)) 29 goto found; 30 _stop("not a tape\n"); 31 found: 32 mbainit(UNITTOMBA(io->i_unit)); 33 htaddr->htcs1 = HT_DCLR|HT_GO; 34 htstrategy(io, HT_REW); 35 skip = io->i_boff; 36 while (skip--) { 37 io->i_cc = -1; 38 while (htstrategy(io, HT_SFORW)) 39 ; 40 DELAY(65536); 41 htstrategy(io, HT_SENSE); 42 } 43 } 44 45 htclose(io) 46 register struct iob *io; 47 { 48 49 htstrategy(io, HT_REW); 50 } 51 52 htstrategy(io, func) 53 register struct iob *io; 54 int func; 55 { 56 register int den, errcnt, ds; 57 short fc; 58 register struct htdevice *htaddr = 59 (struct htdevice *)mbadrv(io->i_unit); 60 61 errcnt = 0; 62 retry: 63 den = HTTC_1600BPI|HTTC_PDP11; 64 htquiet(htaddr); 65 htaddr->htcs1 = HT_DCLR|HT_GO; 66 htaddr->httc = den; 67 htaddr->htfc = -io->i_cc; 68 if (func == HT_SREV) { 69 htaddr->htfc = -1; 70 htaddr->htcs1 = HT_SREV|HT_GO; 71 return (0); 72 } 73 if (func == READ || func == WRITE) 74 mbastart(io, func); 75 else 76 htaddr->htcs1 = func|HT_GO; 77 htquiet(htaddr); 78 ds = htaddr->htds; 79 if (ds & HTDS_TM) { 80 htaddr->htcs1 = HT_DCLR|HT_GO; 81 return (0); 82 } 83 if (ds & HTDS_ERR) { 84 printf("ht error: ds=%b, er=%b\n", 85 MASKREG(htaddr->htds), HTDS_BITS, 86 MASKREG(htaddr->hter), HTER_BITS); 87 htaddr->htcs1 = HT_DCLR|HT_GO; 88 if (errcnt == 10) { 89 printf("ht: unrecovered error\n"); 90 return (-1); 91 } 92 errcnt++; 93 htstrategy(io, HT_SREV); 94 goto retry; 95 } 96 if (errcnt) 97 printf("ht: recovered by retry\n"); 98 fc = htaddr->htfc; 99 return (io->i_cc+fc); 100 } 101 102 htquiet(htaddr) 103 register struct htdevice *htaddr; 104 { 105 register int s; 106 107 do 108 s = htaddr->htds; 109 while ((s & HTDS_DRY) == 0); 110 } 111