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Diffstat (limited to 'static/unix-v10/man7/obproc.7')
| -rw-r--r-- | static/unix-v10/man7/obproc.7 | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/static/unix-v10/man7/obproc.7 b/static/unix-v10/man7/obproc.7 new file mode 100644 index 00000000..6855370d --- /dev/null +++ b/static/unix-v10/man7/obproc.7 @@ -0,0 +1,240 @@ +.pa 1 +.he '3/15/72''BOOT PROCEDURES (VII)' +.ti 0 +NAME bos, maki, rom, vcboot, msys, et al +.sp +.ti 0 +SYNOPSIS -- +.sp +.ti 0 +DESCRIPTION On +the RF disk, the highest 16K words are +reserved for stand-alone programs. +These 16K words are allocated as follows: +.sp +bos (1K) +.br +Warm UNIX (7K) +.br +Cold UNIX (8K) +.sp +The UNIX read only memory (ROM) +is home cut with 2 programs of 16 words each. +The first (address 173000) +reads bos___ from the RF disk into core +location 154000 +and transfers to 154000. +The other ROM program +(address 173040) +reads a DECtape sitting in the end-zone +on drive 0 +into core location 0 and transfers to 0. +This latter operation is compatible with +part of DEC's standard ROM. +The disassembled code for the UNIX ROM follows: +.sp +.nf +.in 8 +173000: mov $177472,r0 12700;177472 + mov $3,-(r0) 12740;3 + mov $140000,-(r0) 12740;140000 + mov $154000,-(r0) 12740;154000 + mov $-2000,-(r0) 12740;176000 + mov $5,-(r0) 12740;5 + tstb (r0) 105710 + bge .-2 2376 + jmp *$154000 137;154000 +.sp +173040: mov $177350,r0 12700;177350 + clr -(r0) 5040 + mov r0,-(r0) 10040 + mov $3,-(r0) 12740;3 + tstb (r0) 105710 + bge .-2 2376 + tst *$177350 5737;177350 + bne . 1377 + movb $5,(r0) 112710;5 + tstb (r0) 105710 + bge .-2 2376 + clr pc 5007 +.fi +.in 16 +.sp +The program bos___ (Bootstrap Operating System) +examines the console switchs and executes +one of several internal programs depending on the setting. +The following settings are currently recognized: +.sp +.in +8 +.ti -8 +??? Will read Warm UNIX from +the RF into core location 0 and transfer to 600. +.sp +.ti -8 +1 Will read Cold UNIX from the +RF into core location 0 and transfer to 600. +.sp +.ti -8 +10 Will dump all of memory +from core location 0 onto DECtape drive 7 +and then halt. +.sp +.ti -8 +20 Will read 256 words from RK0 into +core 0 and transfer to zero. +This is the procedure to boot +DOS from an RK. +.sp +.ti -8 +40 This is the same as 10 above, but +instead of halting, UNIX warm is loaded. +.sp +.ti -8 +0 Will load a standard UNIX binary paper tape +into core location 0 and transfer to 0. +.sp +.ti -8 +77500 Will load the standard DEC absolute and binary +loaders and transfer to 77500. +.sp +.in 16 +Thus we come to the UNIX warm boot procedure: +put 173000 into the switches, push +.ul +load address +and then push +.ul +start. +The alternate switch setting of 173030 +that will load warm UNIX is used +as a signal to bring up +a single user system for special +purposes. +See +init(VII). +For systems without a rom, +UNIX (both warm and cold) +have a copy of the disk boot +program at location 602. +This is probably a better warm boot +procedure because +the program at 602 also +attempts to complete outstanding I/O. +.sp +Cold boots can be accomplished with the +Cold UNIX program, but they're not. +Thus the Cold UNIX slot on the RF may have +any program desired. +This slot is, however, used during a cold boot. +Mount the UNIX INIT DECtape on drive +0 positioned in the end-zone. +Put 173040 into the switches. +Push +.ul +load address. +Put 1 into the switches. +Push +.ul +start. +This reads a program called +.ul +vcboot +from the tape into +core location 0 and transfers to it. +vcboot______ then reads 16K words from +the DECtape (blocks 1-32) +and copies the data to the highest 16K words of +the RF. +Thus this initializes the read-only part of the RF. +vcboot______ then reads in bos___ and executes it. +bos___ then reads in Cold UNIX and executes that. +Cold UNIX halts for a last chance before +it completely initializes the RF file system. +Push +.ul +continue, +and Cold UNIX will initialize the RF. +It then sets into execution a user program +that reads the DECtape for initialization files +starting from block 33. +.a +When this is done, the program executes +/etc/init +which should have been on the tape. +.sp +The INIT tape is made by the program maki____ +running under UNIX. +maki____ writes vcboot______ on block 0 of +.ul +/dev/tap7. +It then copies the RF 16K words (using +.ul +/dev/rf0) +onto blocks 1 thru 32. +It has internally a list of files to +be copied from block 33 on. +This list follows: +.sp +.nf +.in +8 +/etc/init +/bin/chmod +/bin/date +/bin/login +/bin/ls +/bin/mkdir +/etc/mount +/bin/sh +/bin/tap +.in -8 +.fi +.sp +Thus this is the set of programs available after a cold boot. +init____ and sh__ are mandatory. +For multi-user UNIX, +getty_____ and login_____ are also necessary. +mkdir_____ is necessary due to a bug in tap___. +tap___ and mount_____ are useful to +bring in new files. +As soon as possible, date____ should be done. +That leaves ls__ and chmod_____ as frosting. +.sp +The last link in this incestuous +daisy chain is the program msys____. +.sp + msys____ char file +.sp +will copy the file file____ onto the +RF read only slot specified by the characacter char____. +Char is taken from the following set: +.sp + b_ bos + u_ Warm UNIX + 1_ Cold UNIX +.sp +Due to their rarity of use, +maki____ and msys____ are maintained off line and +must be reassembled before used. +.sp +.ti 0 +FILES /dev/rf0, +/dev/tap? +.sp +.ti 0 +SEE ALSO init(VII), +tap(I), +sh(I), +mkdir(I) +.sp +.ti 0 +DIAGNOSTICS -- +.sp +.ti 0 +BUGS This +section is very configuration dependent. +Thus, it does not +describe the boot procedure for +any one machine. +.sp +.ti 0 +OWNER ken |