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Annotation of researchv10dc/dist/man/v3/manx/obproc.7, revision 1.1

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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