glm94/pdp7-unix
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

sys: kernel comments

Browse Source
This commit is contained in:
Phil Budne
2016-03-11 16:01:01 -05:00
parent df1d8e29dd
commit 802ab257b9
8 changed files with 260 additions and 233 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/sys/s8.s
+22 -17
View File
@@ -8,11 +8,10 @@ dspbsz = 270
ndskbs = 4
" flags
" interupt flags
.insys: 0 " "in system"
.int1: 0 " inode for interrupt 1
.int2: 0 " inode for interrupt 2
.ac: 0 " saved AC from interrupt
.int1: 0 " inode for user interrupt 1
.int2: 0 " inode for user interrupt 2
.ac: 0 " saved AC from Priotity Interrupt
.savblk: 0 " set by system call, cleared by disk i/o
.dsptm: 0 " display restart countdown (10 ticks)
.dskb: 0 " set on disk interrupt
@@ -107,7 +106,10 @@ q2:
dsploc: .=.+1
dsplno: .=.+1
dspbuf:
0065057;0147740;0160000
0065057;0147740;0160000 " display commands: see 03-scope.pdf pg 20
" PARAM: clear blink, clear light pen, scale=1, intensity=3
" X-Y: invisible, no delay, Y=01740 (992)
" X-Y: invisible, settling delay, X=0
.=.+30
coldentry:
dzm 0100 " not re-entrant
@@ -134,13 +136,13 @@ coldentry:
dskbuf = 07700
dskbs: .=.+65+65+65+65
edskbsp: .
uquant: .=.+1
dspbufp: .=.+1
pbsflgs: .=.+2
uquant: .=.+1 " number of ticks user has been running
dspbufp: .=.+1 " pointer to display buffer
pbsflgs: .=.+2 " buttons on last tick, last button interrupt
mode: .=.+1
nttychar: .=.+1
nttychar: .=.+1 " CR to send next, or zero
npptchar: .=.+1
ttydelay: .=.+1
ttydelay: .=.+1 " delay count for TTY output
name: .=.+4
lnkaddr: .=.+1
char: .=.+1
@@ -148,6 +150,9 @@ dskaddr: .=.+1
uniqpid: 1 " pid generator
lu: .=.+4 " user (process) table entry copy
sfiles: .=.+10 " wait addresses for special files
" (bit vector of waiting processes?)
" offsets: 0: ttyin, 1: ttyout, 2: keyboard,
" 3: ptr, 4: ptp, 6: display
dpdata:
dpstat: .=.+1
dpread: .=.+1
@@ -211,21 +216,21 @@ userdata: " "ustruct" (swappable)
ii: .=.+1 " number of i-node in inode:
inode: " disk inode in memory:
i.flags: .=.+1 " inode flags
" 400000 free?? (checked/toggled by icreat)
" 400000 in use
" 200000 large file
" 000040 special device (indicated by inum)?
" 000020 directory
" 000040 special device (indicated by inum)
" 000020 directory
" 000010 owner read
" 000004 owner write
" 000002 world read
" 000001 world write
i.dskps: .=.+7 " disk block pointers (indirect if "large file")
i.dskps: .=.+7 " disk block numbers (indirect if "large file")
i.uid: .=.+1 " owner
i.nlks: .=.+1 " link count
i.size: .=.+1
i.nlks: .=.+1 " link count (negative)
i.size: .=.+1 " size (in words)
i.uniq: .=.+1 " unique number
.= inode+12
di: .=.+1
di: .=.+1 " directory index
dnode: " directory entry:
d.i: .=.+1 " inode number
d.name: .=.+4 " name (space padded)