239 lines
5.0 KiB
ArmAsm
239 lines
5.0 KiB
ArmAsm
"** 01-s1.pdf page 48
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" s8
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" manifests
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mnproc = 10
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dspbsz = 270
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ndskbs = 4
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" flags
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" interupt flags
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.insys: 0 " "in system"
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.int1: 0 " inode for interrupt 1
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.int2: 0 " inode for interrupt 2
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.ac: 0 " saved AC from interrupt
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.savblk: 0 " set by system call, cleared by disk i/o
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.dsptm: 0 " display restart countdown (10 ticks)
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.dskb: 0 " set on disk interrupt
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.dske: 0 " status from disk interrupt
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" pointers
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tadu: tad ulist
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dacu: dac ulist
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maxquant: 30
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ofilesp: u.ofiles
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idskpp: i.dskps
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dskbufp: dskbuf
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edspbuf: dspbuf+dspbsz
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dspbufp3: dspbuf+3
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fblksp: s.fblks
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dacq1: dac q1
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lacq1: lac q1
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q2p: q2
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" strings
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initf:
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<i>n;<i>t;< > ;< > "
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" constants
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d0: 0
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d1: 1
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d2: 2
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d3: 3
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d4: 4
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d5: 5
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d6: 6
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d7: o7: 07
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d8: 8
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d9: 9
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o12: d10: 10
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o14: 014
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o15: 015
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o17: 017
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o20: 020
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o33: 033
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o40: 040
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o55: 055
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o77: 077
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d65:o101: 0101
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d33: 33
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o132: 0132
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o134: 0134
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o137: 0137
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o155: 0155
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o177: 0177
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"** 01-s1.pdf page 49
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o212: 0212
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o375: 0375
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o777: 0777
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o2000: 02000
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o4000: 04000
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d7999: 7999
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o10000: 010000
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o17762: 017762
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o17777: 017777
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o20001: 020001
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o40000: 040000
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o40001: 040001
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o70000: 070000
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o77777: 077777
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o100000: 0100000
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o140000: 0140000
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o200000: 0200000
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o200001: 0200001
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o300000: 0300000
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o400000: 0400000
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o500000: 0500000
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o577777: 0577777
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o600000: 0600000
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o640000: 0640000
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o700000: 0700000
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o777700: 0777700
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o777760: 0777760
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dm3: -3
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dm1: -1
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9: .=.+t
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c1: .=.+1
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q1: q2;q2+90 "** ?? 98 ??
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.=.+14
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q2:
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.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0
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.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0
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.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0
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.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0
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.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;.+2;0;0;0
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dsploc: .=.+1
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dsplno: .=.+1
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dspbuf:
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0065057;0147740;0160000
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.=.+30
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coldentry:
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dzm 0100 " not re-entrant
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caf " clear all flags
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ion " enable interrupts
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clon " clear clock flag
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law 3072 " initialize display....
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wcga
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jms dspinit
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law dspbuf
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jms movdsp
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cla " read system block from disk
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jms dskio; 06000
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jms copy; dskbuf; sysdata; ulist-sysdata " copy to system data
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lac d3 " look for "init" in default directory
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jms namei; initf
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jms halt
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"** 01-s1.pdf page 50
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jms iget
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cla
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jms iread; 4096; 4096 " read in "init"
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jmp 4096 " start process 1
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. = dspbuf+dspbsz+3
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dskbuf = 07700
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dskbs: .=.+65+65+65+65
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edskbsp: .
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uquant: .=.+1
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dspbufp: .=.+1
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pbsflgs: .=.+2
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mode: .=.+1
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nttychar: .=.+1
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npptchar: .=.+1
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ttydelay: .=.+1
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name: .=.+4
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lnkaddr: .=.+1
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char: .=.+1
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dskaddr: .=.+1
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uniqpid: 1 " pid generator
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lu: .=.+4 " user (process) table entry copy
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sfiles: .=.+10 " wait addresses for special files
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dpdata:
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dpstat: .=.+1
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dpread: .=.+1
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dpwrite: .=.+1
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dpchar: .=.+1
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dspdata:
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.dspb: .=.+1
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.lpba: .=.+1 "** 4 written on listing
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crdata:
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crread: .=.+1
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crchar: .=.+1
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sysdata: " system data 64 words saved to disk
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s.nxfblk: .=.+1 " pointer to next free block??
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s.nfblks: .=.+1 " number of free blocks (in fblks?)
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s.fblks: .=.+10 " cached free block numbers
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s.uniq: .=.+1 " next unique value
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s.tim: .=.+2 " (up?)time in 60Hz ticks (low, high)
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" process table
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" first word
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" bits 0:2 -- status
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" 0: free slot
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" 1: in/ready
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" 2: in/notready
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" 3: out/ready
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" 4: out/notready??
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" bits 3:17 -- disk swap address/8
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" second word: process pid
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" third word: used for smes/rmes
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" fourth word: ??
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ulist:
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0131000;1;0;0
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0031040;0;0;0
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0031100;0;0;0
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0031140;0;0;0
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0031200;0;0;0
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0031240;0;0;0
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0031300;0;0;0
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0031340;0;0;0
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0031400;0;0;0
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0031440;0;0;0
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userdata: " "ustruct" (swappable)
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u.ac: 0 " user AC
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u.mq: 0 " user MQ
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u.rq: .=.+9 " user 010-017, user PC
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u.uid: -1 " user id
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u.pid: 1 " process id
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u.cdir: 3 " connected directory (inode number?)
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u.ulistp: ulist " pointer to process table entry
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u.swapret: 0 " kernel routine to resume at after swap in
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u.base: 0 " start of user buffer
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u.count: 0 " size of user buffer
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"** 01-s1.pdf page 51
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u.limit: 0 " end of user buffer
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u.ofiles: .=.+30 " open files (10 "fnode" entries)
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u.dspbuf: 0
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u.intflg: 1
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.=userdata+64
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ii: .=.+1 " number of i-node in inode:
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inode: " disk inode in memory:
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i.flags: .=.+1 " inode flags
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" 400000 free?? (checked/toggled by icreat)
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" 200000 large file
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" 000040 special device (indicated by inum)?
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" 000020 directory
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" 000010 owner read
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" 000004 owner write
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" 000002 world read
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" 000001 world write
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i.dskps: .=.+7 " disk block pointers (indirect if "large file")
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i.uid: .=.+1 " owner
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i.nlks: .=.+1 " link count
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i.size: .=.+1
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i.uniq: .=.+1 " unique number
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.= inode+12
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di: .=.+1
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dnode: " directory entry:
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d.i: .=.+1 " inode number
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d.name: .=.+4 " name (space padded)
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d.uniq: .=.+1 " unique number from directory inode
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. = dnode+8
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fnode: " open file entry
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f.flags: .=.+1 " see below
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f.badd: .=.+1 " offset
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f.i: 0 " file i-number
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" f.flags:
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" 400000 in use
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" 000002 read
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" 000001 write
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