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A2osX/SYS/KERNEL.S.CORE.txt

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PR#3
PREFIX /A2OSX.BUILD
LOMEM $A00
INC 1
AUTO 6
*--------------------------------------
SYS.BASL0 .EQ $800
*--------------------------------------
CORE.Run lda CORE.PSCount
sta CORE.Counter
bne .1 SHOULD NEVER HAPPEN!!!
jmp CORE.Events
.1 ldx CORE.Counter
lda PS.Table.PID-1,x
beq .8
lda PS.Table.hMem-1,x
jsr K.GetMemPtr.A
>STYA pPS
lda (pPs) get S.PS.F
bit #S.PS.F.HOLD Waiting for Another Task to Terminate?
beq .2
ldy #S.PS.CPID
lda (pPs),y
jsr CORE.GetPSByID.A
bcc .8 yes, still running....
lda (pPs) get S.PS.F again
and #$FF^S.PS.F.HOLD unmark as HOLD
sta (pPs)
.2 jsr CORE.PSEnter Restore at least ZP & Ptrs
lda (pPs) get S.PS.F again
bit #S.PS.F.SLEEP Is this PS sleeping?
beq .3 no, call INIT/RUN
and #$FF^S.PS.F.SLEEP unmark as SLEEP
sta (pPS)
jsr CORE.PSResume Restore PC....and JMP to
bcc .7
bcs .5
.3 bit #S.PS.F.INIT
beq .4
and #$FF^S.PS.F.INIT unmark as INIT
sta (pPS)
ldx #TSKMGR.INIT
.HS 2C BIT abs
.4 ldx #TSKMGR.RUN
jsr pCodeJmp Call INIT/RUN function
bcc .7 INIT/RUN/RESUME said CS=QUIT?
.5 tax save RC
ldy #S.PS.PPID Notify Parent Process for exit code...
lda (pPs),y
jsr CORE.GetPSByID.A X unmodified
bcs .6 parent is dead.....skipping...
>STYA ZPPtr1
lda (ZPPtr1) Parent PS is HOLD?
bit #S.PS.F.HOLD
beq .6 no...
eor #S.PS.F.HOLD yes, release hold...
sta (ZPPtr1)
txa ...probably waiting for this PS to terminate....
ldy #S.PS.RC give it RC
sta (ZPPtr1),y
.6 ldx #TSKMGR.QUIT Quit this process
jsr pCodeJmp Call QUIT function
ldy #S.PS.PID
lda (pPs),y
jsr CORE.PSFree.A
bra .8
.7 jsr CORE.PSLeave Save ZP & Ptrs
.8 dec CORE.Counter
bne .1
*--------------------------------------
CORE.Events jsr CORE.GetEvents
bcs .4 CS=no event
jsr CORE.DispatchEvents
bcc .4 CC=All Events Dispatched
jsr CORE.PSSelect0
lda #EvtMgr.Table
sta pEvent
.1 lda (pEvent)
beq .3
bmi .2 Ignore & Discard any timer event
jsr CORE.DumpEvent
.2 jsr CORE.DestroyEvent
.3 lda pEvent
clc
adc #S.EVT
sta pEvent
lda EVTMGR.COUNT
bne .1
*--------------------------------------
.4 lda A2osX.ASCREEN
cmp #2 is SYS active?
bne .6
ldx CORE.CPULoadI
lda CORE.CPULoadC,x
sta SYS.BASL0+38
dex
bpl .5
ldx #3
.5 stx CORE.CPULoadI
.6 bit OPENAPPLE
bpl .8
lda KBD
bpl .8
cmp #"1"
bcc .8
cmp #"5"
bcs .8
sta KBDSTROBE
jsr CORE.ScreenSelect
.8 jmp CORE.Run
*--------------------------------------
* CORE.GetEvents :
* IN :
* OUT :
* CS = no event, A = ERROR
* CC * event in YA
* (pEvent)
*--------------------------------------
CORE.GetEvents lda #EvtMgr.Table
sta pEvent point to start of event list
stz EvtMgr.Count reset Size
lda K.IrkMgr.VBL do we have IRQ enabled for VBL ?
bpl .10 no, regular poll
lda K.IrkMgr.VBLINT
beq .3 no
dec K.IrkMgr.VBLINT
bra .11
.10 lda VBL get VLINE status
tax
eor EvtMgr.VBLState
bpl .3 no change,no tick
txa
sta EvtMgr.VBLState save new
bpl .3 Up2down transition,no tick
.11 inc A2osX.TIMER16
bne .1
inc A2osX.TIMER16+1
.1 dec EvtMgr.HZ.CNT
bne .3 not yet 100ms
ldx A2osX.HZ
stx EvtMgr.HZ.CNT
lda #S.EVT.F.T10TH
dec EvtMgr.10TH.CNT
bne .2
ldx #10
stx EvtMgr.10TH.CNT
ora #S.EVT.F.T1SEC
.2 sta (pEvent)
inc EvtMgr.Count Add one event to Queue
lda pEvent
clc
adc #S.EVT
sta pEvent if CS, EVT queue full!!! ($100)
.3 sec
lda EvtMgr.Count if 0, exit with CS (from cmp), and A=0 "no event"
beq .9
.8 clc
.9 rts
*--------------------------------------
* CORE.DispatchEvents
* IN:
* OUT:
* CS: Not Dispatched
* CC: Event Cleared
*--------------------------------------
CORE.DispatchEvents
lda CORE.PSCount
sta CORE.Counter
beq .9
.1 ldx CORE.Counter
lda PS.Table.PID-1,x
beq .5
lda PS.Table.hMem-1,x
jsr K.GetMemPtr.A
>STYA pPS
lda (pPs) get S.PS.F
bit #S.PS.F.INIT+S.PS.F.HOLD Init or Waiting for Another Task to Terminate?
bne .5
bit #S.PS.F.EVENT Accept Events ?
beq .5
jsr CORE.PSEnter
lda #EvtMgr.Table
sta pEvent Select first event in list
lda EVTMGR.COUNT
sta TSKMGR.EVENTCNT
.2 lda (pEvent) Empty event, select next
beq .3
ldx #TSKMGR.DOEVENT
jsr pCodeJmp Call DOEVENT function
bcs .3 not for this PS, try next event in list
jsr CORE.DestroyEvent this PS handled the EVT, destroy it...
lda EVTMGR.COUNT
beq .8 no more event, exit
.3 dec TSKMGR.EVENTCNT
beq .4 all EVT submitted to this PS, try other PS
lda pEvent try next EVT to this PS
clc
adc #S.EVT
sta pEvent
bra .2
.4 jsr CORE.PSLeave
.5 dec CORE.Counter
bne .1
.9 sec
rts
.8 clc
rts
*--------------------------------------
CORE.Quit clc
rts
*--------------------------------------
* PS.Free.A
* In : A = PID to free
*--------------------------------------
CORE.PSFree.A sta .1+1 Save PS ID
jsr CORE.GetPSByID.A PS in ZPPtr1
bcs .9
>STYA ZPPtr1
ldy #S.PS.hSS
jsr .8
ldy #S.PS.hDS
jsr .8
ldy #S.PS.hCS
jsr .8
ldy #S.PS.hARGS
jsr .8
lda (ZPPtr1) get S.PS.F
and #S.PS.F.ENV do we have to discard duplicated env & prefix ?
beq .1
ldy #S.PS.hENV
jsr .8
ldy #S.PS.hPREFIX
jsr .8
.1 lda #$ff Self Modified
ldx CORE.PSCount
.2 cmp PS.Table.PID-1,x
beq .3
dex
bne .2
bra *
.3 stz PS.Table.PID-1,x
lda PS.TABLE.hMem-1,x
jmp K.FreeMem.A
.8 lda (ZPPtr1),y
bne .9
.9 rts
*--------------------------------------
* X unmodofied
*--------------------------------------
CORE.GetPSByID.A
ldy CORE.PSCount
beq .9
.1 cmp PS.Table.PID-1,y
beq .2
dey
bne .1
.9 lda #TSKMGR.ERRNSP
sec
rts
.2 lda PS.TABLE.hMem-1,y
jmp K.GetMemPtr.A
*--------------------------------------
CORE.DumpEvent ldy #S.EVT-1
.1 >PUSHB (pEvent),y
dey
bpl .1
>LDYAI .2
jmp K.PrintF.YA
.2 >CSTR "!Evt:F=%b,Dev=$%h,LO=$%h,HI=$%h,W1=$%H,W2=$%H\n"
*--------------------------------------
CORE.ScreenSelect
and #$0F
cmp A2osX.ASCREEN Same as active screen...nothing to do
beq .8
tax
lda A2osX.SCRNDEVS-1,x
beq .8 No device claimed this screen
jsr K.GetDevByID.A x unmodified.....
bcs .8 ???
stx A2osX.ASCREEN
>STYA pDev
ldx #DEVMGR.CONTROL
jmp pDevJmp
.8 rts
*--------------------------------------
CORE.DestroyEvent
lda (pEvent)
beq .9
bit #S.EVT.F.hMEM1
beq .1
pha
ldy #S.EVT.DATALO
lda (pEvent),y
jsr K.FreeMem.A
pla
.1 bit #S.EVT.F.hMEM2
beq .2
ldy #S.EVT.DATAHI
lda (pEvent),y
jsr K.FreeMem.A
.2 lda #0
sta (pEvent)
dec EvtMgr.Count
.9 rts
*--------------------------------------
CORE.PSSelect0 >LDYAI CORE.S.PS0 Select PS0
>STYA pPs
>LDYA CORE.S.PS0+S.PS.Context+4
>STYA pStack
rts
*/--------------------------------------
* # Sleep
* Make current process suspend until next RUN
* ## In :
* (none)
* ## Out :
* (none)
*\--------------------------------------
K.Sleep pla get PC LO
sec
sbc pCode
ldy #S.PS.PC
sta (pPs),y
pla get PC HI
sbc pCode+1
iny
sta (pPs),y
lda (pPs)
ora #S.PS.F.SLEEP
sta (pPs)
*--------------------------------------
CORE.PSLeave ldy #S.PS.Context+23
ldx #23
.1 lda pCode,x
sta (pPs),y
dey
dex
bpl .1
clc No error,
rts back to Kernel
*--------------------------------------
CORE.PSEnter ldy #S.PS.Context+23
ldx #23
.1 lda (pPs),y
sta pCode,x
dey
dex
bpl .1
rts
*--------------------------------------
CORE.PSResume ldy #S.PS.PC
lda (pPs),y
sec Advance PC by one as it was saved by a JSR
adc pCode setup by PS.Select
sta .8+1
iny
lda (pPs),y
adc pCode+1
sta .8+2
.8 jmp $FFFF
*--------------------------------------
TSKMGR.EVENTCNT .BS 1
*--------------------------------------
DevMgr.Stat .DA DevMgr.NUL.Code
DevMgr.Free .DA DevMgr.FreeMem
.DA DevMgr.HiMem
DevMgr.Count .DA #2 NUL,SYS
*--------------------------------------
EvtMgr.VBLState .BS 1
EvtMgr.10TH.CNT .BS 1
EvtMgr.HZ.CNT .BS 1
EvtMgr.Count .BS 1
*--------------------------------------
CORE.CPULoadI .BS 1
CORE.CPULoadC .AS -"/-\|"
CORE.Counter .BS 1
CORE.PSCount .DA #0
CORE.LastPSID .DA #0
CORE.S.PS0 .BS S.PS
*--------------------------------------
MAN
SAVE /A2OSX.SRC/SYS/KERNEL.S.CORE
LOAD /A2OSX.SRC/SYS/KERNEL.S
ASM
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