Commit | Line | Data |
---|---|---|
cb1c44c2 | 1 | /* |
0880b18e | 2 | * Copyright (c) 1980, 1986 Regents of the University of California. |
cb1c44c2 KM |
3 | * All rights reserved. The Berkeley software License Agreement |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
6 | ||
0880b18e | 7 | /* "@(#)utboot.c 7.1 (Berkeley) %G%" */ |
2afab629 SL |
8 | |
9 | /* | |
10 | * VAX tape boot block for distribution tapes | |
11 | * works on unibus tm03 | |
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 | ||
49 | /* UT UBA registers */ | |
50 | .set UTCS1,0 | |
51 | .set UTWC,02 | |
52 | .set UTBA,04 | |
53 | .set UTFC,06 | |
54 | .set UTCS2,010 | |
55 | .set UTDS,012 | |
56 | .set UTER,014 | |
57 | .set UTAS,016 | |
0b00f765 | 58 | .set UTCC,020 |
2afab629 SL |
59 | .set UTDB,022 |
60 | .set UTMR,024 | |
61 | .set UTDT,026 | |
62 | .set UTSN,030 | |
63 | .set UTTC,032 | |
64 | ||
65 | /* UT commands and bits */ | |
66 | .set GO,01 | |
0b00f765 SL |
67 | .set UT_REW,0x6 |
68 | .set UT_RCOM,0x38 | |
69 | .set UT_SREV,0x1a | |
70 | .set UT_DCLR,0x8 | |
94404742 MK |
71 | .set UT_crdy,7 /* bit pos. */ |
72 | .set UT_gapsd,13 /* bit; aka "positioning in progress" */ | |
0b00f765 | 73 | .set UTDENS,0x4c0 /* 1600 bpi, PDP-11 format */ |
2afab629 SL |
74 | /* local stack variables */ |
75 | .set tapa,-4 /* desired tape addr */ | |
76 | .set mtapa,-8 /* current tape addr */ | |
77 | .set name,-8-PTHSIZ /* operator-typed file name */ | |
78 | /* register usage */ | |
79 | .set rUBA,r10 | |
80 | .set rUT,r11 | |
81 | /* ===== */ | |
82 | ||
83 | /* initialization */ | |
84 | init: | |
85 | movl $RELOC,fp /* core loc to which to move this program */ | |
86 | addl3 $name,fp,sp /* set stack pointer; leave room for locals */ | |
87 | clrl r0 | |
88 | 1: | |
89 | movc3 $end,(r0),(fp) /* move boot up to relocated position */ | |
90 | jmp start+RELOC | |
91 | start: | |
92 | bsbw rew /* rewind input tape */ | |
93 | movab name(fp),r4 /* start of filename storage */ | |
94 | movzbl $'=,r0 /* prompt character */ | |
95 | bsbw putc /* output char to main console */ | |
96 | /* read in a file name */ | |
97 | movl r4,r1 /* loc at which to store file name */ | |
98 | nxtc: | |
99 | bsbw getc /* get input char's in file name */ | |
100 | cmpb r0,$012 /* terminator ? */ | |
101 | beql nullc | |
102 | movb r0,(r1)+ | |
103 | brb nxtc | |
104 | nullc: | |
105 | subl3 r4,r1,r9 /* size of path name */ | |
106 | beql start /* dumb operator */ | |
107 | clrb (r1)+ | |
108 | incl r9 | |
109 | /* user-specified TP filename has been stored at name(fp) */ | |
110 | /* read in entire tp directory contents into low core */ | |
111 | dirred: | |
112 | movl $8,tapa(fp) /* tp directory starts at block 8 */ | |
113 | movl $(NUMDIR*BLKSIZ),r6 /* no. bytes in total dir */ | |
114 | bsbw taper /* read no. bytes indicated */ | |
115 | /* search entire directory for user-specified file name */ | |
116 | clrl r5 /* dir buff loc = 0 */ | |
117 | nxtdir: | |
118 | cmpc3 r9,(r5),(r4) /* see if dir entry matches filename */ | |
119 | beql fndfil /* found match */ | |
120 | acbl $NUMDIR*BLKSIZ-1,$ENTSIZ,r5,nxtdir | |
121 | /* see if done with tp dir */ | |
122 | brw start /* entry not in directory; start over */ | |
123 | /* found desired tp dir entry */ | |
124 | fndfil: | |
125 | movzwl BNUM(r5),tapa(fp) /* start block no., 2 bytes */ | |
126 | addl2 $7,tapa(fp) /* skip 7 boot blocks */ | |
127 | movzwl FILSIZ(r5),r6 /* low 2 bytes file size */ | |
128 | insv FILSIZ-1(r5),$16,$8,r6 /* file size, high byte */ | |
129 | cmpl r6,$RELOC-512 /* check if file fits below stack */ | |
130 | blss filok /* file o.k. */ | |
131 | brw start /* file too large */ | |
132 | /* time to read in desired file from tape */ | |
133 | filok: | |
134 | movl r6,r7 /* save r6 */ | |
135 | bsbb taper | |
136 | bsbw rew | |
137 | /* clear core */ | |
138 | subl3 r7,$RELOC-4,r0 /* no. bytes to clear */ | |
139 | 1: | |
140 | clrb (r7)+ | |
141 | sobgtr r0,1b | |
142 | /* time to jump to start of file & execute */ | |
143 | addl3 $20,fp,ap | |
144 | clrl r5 | |
145 | calls $0,(r5) | |
146 | brw start | |
147 | /* taper: movcTAPE (r6),tapa(fp),0 */ | |
148 | rew2: | |
149 | bsbb rew /* beginning of tape */ | |
150 | taper0: | |
151 | bsbb rrec /* advance 1 block; never want blk 0 */ | |
152 | taper: | |
153 | clrl r0 /* page no. */ | |
154 | cmpl mtapa(fp),tapa(fp) /* current position .vs. desired */ | |
155 | bgtr rew2 | |
156 | blss taper0 | |
157 | 1: | |
158 | bsbb rrec | |
159 | acbl $1,$-BLKSIZ,r6,1b | |
160 | rsb | |
161 | /* rew: rewind the tape */ | |
162 | rew: | |
163 | clrl mtapa(fp) /* current position */ | |
164 | movw $UTDENS,UTTC(%rUT) /* select drive */ | |
165 | movw $UT_REW+GO,UTCS1(%rUT) | |
166 | rsb | |
167 | /* rrec: read 1 block from mag tape into page (r0) */ | |
168 | rrec: | |
169 | /* pushl r0; movzbl $'r,r0; bsbw putc; movl (sp)+,r0; */ | |
f20d7ae3 | 170 | jsb utquiet |
2afab629 SL |
171 | movw $-BLKSIZ,UTFC(%rUT) |
172 | movw $-256,UTWC(%rUT) /* !!!!!!!!!!!!!! */ | |
173 | bisl3 $MRV|MR_BDP1,r0,UBA_MAP(%rUBA) | |
174 | movw $0,UTBA(%rUT) | |
175 | movw $UTDENS,UTTC(%rUT) /* select drive */ | |
176 | movw $UT_RCOM+GO,UTCS1(%rUT) | |
f20d7ae3 | 177 | jsb utquiet |
2afab629 SL |
178 | bisl2 $BNE,UBA_DPR1(%rUBA) |
179 | tstw UTER(%rUT) | |
180 | jgeq 2f | |
181 | mnegw $1,UTWC(%rUT) | |
182 | movw $UTDENS,UTTC(%rUT) /* select drive */ | |
183 | movw $UT_SREV+GO,UTCS1(%rUT) | |
184 | jmp rrec | |
185 | 2: | |
186 | incl r0 /* next page no. */ | |
187 | incl mtapa(fp) /* mag tape block position */ | |
188 | rsb | |
189 | getc: | |
190 | mfpr $RXCS,r0 | |
191 | bbc $RXCS_pd,r0,getc /* receiver ready ? */ | |
192 | mfpr $RXDB,r0 | |
193 | extzv $0,$7,r0,r0 | |
194 | cmpb r0,$015 | |
195 | bneq putc | |
196 | bsbb putc | |
197 | movb $0,r0 | |
198 | bsbb putc | |
199 | movb $012,r0 | |
200 | putc: | |
201 | mfpr $TXCS,r2 | |
202 | bbc $TXCS_pr,r2,putc /* transmitter ready ? */ | |
203 | extzv $0,$7,r0,r0 | |
204 | mtpr r0,$TXDB | |
205 | rsb | |
f20d7ae3 | 206 | utquiet: |
2afab629 | 207 | movw UTCS1(%rUT),r2 |
f20d7ae3 | 208 | bbc $UT_crdy,r2,utquiet |
2afab629 SL |
209 | 1: |
210 | movw UTDS(%rUT),r2 | |
211 | bbs $UT_gapsd,r2,1b | |
212 | rsb | |
213 | end: |