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1.1 root 1: .pa 1
2: .he '3/15/72''BOOT PROCEDURES (VII)'
3: .ti 0
4: NAME bos, maki, rom, vcboot, msys, et al
5: .sp
6: .ti 0
7: SYNOPSIS --
8: .sp
9: .ti 0
10: DESCRIPTION On
11: the RF disk, the highest 16K words are
12: reserved for stand-alone programs.
13: These 16K words are allocated as follows:
14: .sp
15: bos (1K)
16: .br
17: Warm UNIX (7K)
18: .br
19: Cold UNIX (8K)
20: .sp
21: The UNIX read only memory (ROM)
22: is home cut with 2 programs of 16 words each.
23: The first (address 173000)
24: reads bos___ from the RF disk into core
25: location 154000
26: and transfers to 154000.
27: The other ROM program
28: (address 173040)
29: reads a DECtape sitting in the end-zone
30: on drive 0
31: into core location 0 and transfers to 0.
32: This latter operation is compatible with
33: part of DEC's standard ROM.
34: The disassembled code for the UNIX ROM follows:
35: .sp
36: .nf
37: .in 8
38: 173000: mov $177472,r0 12700;177472
39: mov $3,-(r0) 12740;3
40: mov $140000,-(r0) 12740;140000
41: mov $154000,-(r0) 12740;154000
42: mov $-2000,-(r0) 12740;176000
43: mov $5,-(r0) 12740;5
44: tstb (r0) 105710
45: bge .-2 2376
46: jmp *$154000 137;154000
47: .sp
48: 173040: mov $177350,r0 12700;177350
49: clr -(r0) 5040
50: mov r0,-(r0) 10040
51: mov $3,-(r0) 12740;3
52: tstb (r0) 105710
53: bge .-2 2376
54: tst *$177350 5737;177350
55: bne . 1377
56: movb $5,(r0) 112710;5
57: tstb (r0) 105710
58: bge .-2 2376
59: clr pc 5007
60: .fi
61: .in 16
62: .sp
63: The program bos___ (Bootstrap Operating System)
64: examines the console switchs and executes
65: one of several internal programs depending on the setting.
66: The following settings are currently recognized:
67: .sp
68: .in +8
69: .ti -8
70: ??? Will read Warm UNIX from
71: the RF into core location 0 and transfer to 600.
72: .sp
73: .ti -8
74: 1 Will read Cold UNIX from the
75: RF into core location 0 and transfer to 600.
76: .sp
77: .ti -8
78: 10 Will dump all of memory
79: from core location 0 onto DECtape drive 7
80: and then halt.
81: .sp
82: .ti -8
83: 20 Will read 256 words from RK0 into
84: core 0 and transfer to zero.
85: This is the procedure to boot
86: DOS from an RK.
87: .sp
88: .ti -8
89: 40 This is the same as 10 above, but
90: instead of halting, UNIX warm is loaded.
91: .sp
92: .ti -8
93: 0 Will load a standard UNIX binary paper tape
94: into core location 0 and transfer to 0.
95: .sp
96: .ti -8
97: 77500 Will load the standard DEC absolute and binary
98: loaders and transfer to 77500.
99: .sp
100: .in 16
101: Thus we come to the UNIX warm boot procedure:
102: put 173000 into the switches, push
103: .ul
104: load address
105: and then push
106: .ul
107: start.
108: The alternate switch setting of 173030
109: that will load warm UNIX is used
110: as a signal to bring up
111: a single user system for special
112: purposes.
113: See
114: init(VII).
115: For systems without a rom,
116: UNIX (both warm and cold)
117: have a copy of the disk boot
118: program at location 602.
119: This is probably a better warm boot
120: procedure because
121: the program at 602 also
122: attempts to complete outstanding I/O.
123: .sp
124: Cold boots can be accomplished with the
125: Cold UNIX program, but they're not.
126: Thus the Cold UNIX slot on the RF may have
127: any program desired.
128: This slot is, however, used during a cold boot.
129: Mount the UNIX INIT DECtape on drive
130: 0 positioned in the end-zone.
131: Put 173040 into the switches.
132: Push
133: .ul
134: load address.
135: Put 1 into the switches.
136: Push
137: .ul
138: start.
139: This reads a program called
140: .ul
141: vcboot
142: from the tape into
143: core location 0 and transfers to it.
144: vcboot______ then reads 16K words from
145: the DECtape (blocks 1-32)
146: and copies the data to the highest 16K words of
147: the RF.
148: Thus this initializes the read-only part of the RF.
149: vcboot______ then reads in bos___ and executes it.
150: bos___ then reads in Cold UNIX and executes that.
151: Cold UNIX halts for a last chance before
152: it completely initializes the RF file system.
153: Push
154: .ul
155: continue,
156: and Cold UNIX will initialize the RF.
157: It then sets into execution a user program
158: that reads the DECtape for initialization files
159: starting from block 33.
160: .a
161: When this is done, the program executes
162: /etc/init
163: which should have been on the tape.
164: .sp
165: The INIT tape is made by the program maki____
166: running under UNIX.
167: maki____ writes vcboot______ on block 0 of
168: .ul
169: /dev/tap7.
170: It then copies the RF 16K words (using
171: .ul
172: /dev/rf0)
173: onto blocks 1 thru 32.
174: It has internally a list of files to
175: be copied from block 33 on.
176: This list follows:
177: .sp
178: .nf
179: .in +8
180: /etc/init
181: /bin/chmod
182: /bin/date
183: /bin/login
184: /bin/ls
185: /bin/mkdir
186: /etc/mount
187: /bin/sh
188: /bin/tap
189: .in -8
190: .fi
191: .sp
192: Thus this is the set of programs available after a cold boot.
193: init____ and sh__ are mandatory.
194: For multi-user UNIX,
195: getty_____ and login_____ are also necessary.
196: mkdir_____ is necessary due to a bug in tap___.
197: tap___ and mount_____ are useful to
198: bring in new files.
199: As soon as possible, date____ should be done.
200: That leaves ls__ and chmod_____ as frosting.
201: .sp
202: The last link in this incestuous
203: daisy chain is the program msys____.
204: .sp
205: msys____ char file
206: .sp
207: will copy the file file____ onto the
208: RF read only slot specified by the characacter char____.
209: Char is taken from the following set:
210: .sp
211: b_ bos
212: u_ Warm UNIX
213: 1_ Cold UNIX
214: .sp
215: Due to their rarity of use,
216: maki____ and msys____ are maintained off line and
217: must be reassembled before used.
218: .sp
219: .ti 0
220: FILES /dev/rf0,
221: /dev/tap?
222: .sp
223: .ti 0
224: SEE ALSO init(VII),
225: tap(I),
226: sh(I),
227: mkdir(I)
228: .sp
229: .ti 0
230: DIAGNOSTICS --
231: .sp
232: .ti 0
233: BUGS This
234: section is very configuration dependent.
235: Thus, it does not
236: describe the boot procedure for
237: any one machine.
238: .sp
239: .ti 0
240: OWNER ken
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