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1.1 ! root 1: /* ! 2: * Copyright (c) 1980, 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: ! 7: /* "@(#)tsboot.c 7.1 (Berkeley) 6/5/86" */ ! 8: ! 9: /* ! 10: * VAX tape boot block for distribution tapes ! 11: * works on unibus ts11 ! 12: * ! 13: * reads a program from a tp directory on a tape and executes it ! 14: * program must be stripped of the header and is loaded ``bits as is'' ! 15: * you can return to this loader via ``ret'' as you are called ``calls $0,ent'' ! 16: */ ! 17: .set RELOC,0x70000 ! 18: /* a.out defines */ ! 19: .set HDRSIZ,040 /* size of file header for VAX */ ! 20: .set MAGIC,0410 /* file type id in header */ ! 21: .set TSIZ,4 /* text size */ ! 22: .set DSIZ,8 /* data size */ ! 23: .set BSIZ,12 /* bss size */ ! 24: .set TENT,024 /* task header entry loc */ ! 25: /* tp directory definitions */ ! 26: .set FILSIZ,38 /* tp direc offset for file size */ ! 27: .set BNUM,44 /* tp dir offset for start block no. */ ! 28: .set ENTSIZ,64 /* size of 1 TP dir entry, bytes */ ! 29: .set PTHSIZ,32 /* size of TP path name, bytes */ ! 30: .set BLKSIZ,512 /* tape block size, bytes */ ! 31: .set NUMDIR,24 /* no. of dir blocks on tape */ ! 32: .set ENTBLK,8 /* no. of dir entries per tape block */ ! 33: /* processor registers and bits */ ! 34: .set RXCS,32 ! 35: .set RXDB,33 ! 36: .set TXCS,34 ! 37: .set TXDB,35 ! 38: .set RXCS_DONE,0x80 ! 39: .set TXCS_RDY,0x80 ! 40: .set TXCS_pr,7 /* bit position of TXCS ready bit */ ! 41: .set RXCS_pd,7 /* bit position of RXCS done bit */ ! 42: /* UBA registers */ ! 43: .set UBA_DPR1,68 ! 44: .set UBA_MAP,2048 ! 45: .set BNE,0x80000000 ! 46: .set MRV,0x80000000 ! 47: .set MR_BDP1,0x200000 ! 48: /* TS UBA registers */ ! 49: .set TSDB,0 ! 50: .set TSSR,2 ! 51: /* TS commands and bits */ ! 52: .set TSA,0x200 /* page 1, ts command buffer relocation */ ! 53: .set TS_ACK,0100000 /* ack packet */ ! 54: .set TS_CVC,040000 /* clear volume check */ ! 55: .set TS_SETCHR,4 /* set characteristics */ ! 56: .set TS_READ,1 /* read */ ! 57: .set TS_RETRY,01000 /* retry, or with read */ ! 58: .set TS_REWIND,02010 ! 59: /* local stack variables */ ! 60: .set tapa,-4 /* desired tape addr */ ! 61: .set mtapa,-8 /* current tape addr */ ! 62: .set name,-8-PTHSIZ /* operator-typed file name */ ! 63: /* register usage */ ! 64: .set rUBA,r10 ! 65: .set rTS,r11 ! 66: /* ===== */ ! 67: ! 68: /* initialization */ ! 69: init: ! 70: movl $RELOC,fp /* core loc to which to move this program */ ! 71: addl3 $name,fp,sp /* set stack pointer; leave room for locals */ ! 72: clrl r0 ! 73: 1: ! 74: movc3 $end,(r0),(fp) /* move boot up to relocated position */ ! 75: jmp start+RELOC ! 76: start: ! 77: ashl $-9,$RELOC,r0 ! 78: bisl3 $MRV,r0,UBA_MAP+4(%rUBA) ! 79: clrw TSSR(%rTS) ! 80: bsbw tsquiet ! 81: movw $TSA+setchr,TSDB(%rTS) ! 82: bsbw tsquiet ! 83: bsbw rew /* rewind input tape */ ! 84: movab name(fp),r4 /* start of filename storage */ ! 85: movzbl $'=,r0 /* prompt character */ ! 86: bsbw putc /* output char to main console */ ! 87: /* read in a file name */ ! 88: movl r4,r1 /* loc at which to store file name */ ! 89: nxtc: ! 90: bsbw getc /* get input char's in file name */ ! 91: cmpb r0,$012 /* terminator ? */ ! 92: beql nullc ! 93: movb r0,(r1)+ ! 94: brb nxtc ! 95: nullc: ! 96: subl3 r4,r1,r9 /* size of path name */ ! 97: beql start /* dumb operator */ ! 98: clrb (r1)+ ! 99: incl r9 ! 100: /* user-specified TP filename has been stored at name(fp) */ ! 101: /* read in entire tp directory contents into low core */ ! 102: dirred: ! 103: movl $8,tapa(fp) /* tp directory starts at block 8 */ ! 104: movl $(NUMDIR*BLKSIZ),r6 /* no. bytes in total dir */ ! 105: bsbw taper /* read no. bytes indicated */ ! 106: /* search entire directory for user-specified file name */ ! 107: clrl r5 /* dir buff loc = 0 */ ! 108: nxtdir: ! 109: cmpc3 r9,(r5),(r4) /* see if dir entry matches filename */ ! 110: beql fndfil /* found match */ ! 111: acbl $NUMDIR*BLKSIZ-1,$ENTSIZ,r5,nxtdir ! 112: /* see if done with tp dir */ ! 113: brw start /* entry not in directory; start over */ ! 114: /* found desired tp dir entry */ ! 115: fndfil: ! 116: movzwl BNUM(r5),tapa(fp) /* start block no., 2 bytes */ ! 117: addl2 $7,tapa(fp) /* skip 7 boot blocks */ ! 118: movzwl FILSIZ(r5),r6 /* low 2 bytes file size */ ! 119: insv FILSIZ-1(r5),$16,$8,r6 /* file size, high byte */ ! 120: cmpl r6,$RELOC-512 /* check if file fits below stack */ ! 121: blss filok /* file o.k. */ ! 122: brw start /* file too large */ ! 123: /* time to read in desired file from tape */ ! 124: filok: ! 125: movl r6,r7 /* save r6 */ ! 126: bsbb taper ! 127: bsbw rew ! 128: /* clear core */ ! 129: subl3 r7,$RELOC-4,r0 /* no. bytes to clear */ ! 130: 1: ! 131: clrb (r7)+ ! 132: sobgtr r0,1b ! 133: /* time to jump to start of file & execute */ ! 134: addl3 $20,fp,ap ! 135: clrl r5 ! 136: calls $0,(r5) ! 137: brw start ! 138: /* taper: movcTAPE (r6),tapa(fp),0 */ ! 139: rew2: ! 140: bsbb rew /* beginning of tape */ ! 141: taper0: ! 142: bsbb rrec /* advance 1 block; never want blk 0 */ ! 143: taper: ! 144: clrl r0 /* page no. */ ! 145: cmpl mtapa(fp),tapa(fp) /* current position .vs. desired */ ! 146: bgtr rew2 ! 147: blss taper0 ! 148: 1: ! 149: bsbb rrec ! 150: acbl $1,$-BLKSIZ,r6,1b ! 151: rsb ! 152: /* rew: rewind the tape */ ! 153: rew: ! 154: clrl mtapa(fp) /* current position */ ! 155: movw $TSA+rewind,TSDB(%rTS) ! 156: bsbb tsquiet ! 157: rsb ! 158: /* rrec: read 1 block from mag tape into page (r0) */ ! 159: rrec: ! 160: /* pushl r0; movzbl $'r,r0; bsbw putc; movl (sp)+,r0; */ ! 161: bisl3 $MRV,r0,UBA_MAP(%rUBA) ! 162: movw $TS_ACK|TS_CVC|TS_READ,tsread ! 163: 1: ! 164: movw $TSA+tsread,TSDB(%rTS) ! 165: bsbb tsquiet ! 166: /* bisl2 $BNE,UBA_DPR1(%rUBA) */ ! 167: tstw TSSR(%rTS) ! 168: bgeq 2f ! 169: bisw2 $TS_RETRY,tsread ! 170: brb 1b ! 171: 2: ! 172: incl r0 /* next page no. */ ! 173: incl mtapa(fp) /* mag tape block position */ ! 174: rsb ! 175: tsquiet: ! 176: tstb TSSR(%rTS) ! 177: bgeq tsquiet ! 178: rsb ! 179: getc: ! 180: mfpr $RXCS,r0 ! 181: bbc $RXCS_pd,r0,getc /* receiver ready ? */ ! 182: mfpr $RXDB,r0 ! 183: extzv $0,$7,r0,r0 ! 184: cmpb r0,$015 ! 185: bneq putc ! 186: bsbb putc ! 187: movb $0,r0 ! 188: bsbb putc ! 189: movb $012,r0 ! 190: putc: ! 191: mfpr $TXCS,r2 ! 192: bbc $TXCS_pr,r2,putc /* transmitter ready ? */ ! 193: extzv $0,$7,r0,r0 ! 194: mtpr r0,$TXDB ! 195: rsb ! 196: .align 2 ! 197: setchr: ! 198: .word TS_ACK|TS_CVC|TS_SETCHR ! 199: .long TSA+char ! 200: .word 0xe ! 201: char: ! 202: .long TSA+tsstat ! 203: .word 0xe ! 204: .word 0 ! 205: tsread: ! 206: .word TS_ACK|TS_CVC|TS_READ ! 207: .long 0 ! 208: .word BLKSIZ ! 209: rewind: ! 210: .word TS_ACK|TS_CVC|TS_REWIND ! 211: .long 0 ! 212: .word 0 ! 213: tsstat: ! 214: .space 7*2 ! 215: end:
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