A2osX/SYS/KERNEL.S.CORE.txt

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