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) 06/05/86" */ 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: 216