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.s 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:
Defined functions
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Last modified: 1986-06-05
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