A2osX/SYS/KERNEL.S.PS.txt

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PR#3
PREFIX /A2OSX.BUILD
LOMEM $A00
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INC 1
AUTO 6
*/--------------------------------------
* # ExecProcessNewEnvYA
* # ExecProcessYA (Blocking Parent PID)
* # CreateProcessNewEnvYA
* # CreateProcessYA (Non Blocking)
* ## In:
* Y,A = PTR To Cmd Line
* ## Out:
* A = Child PSID
*\--------------------------------------
K.ExecProcessNewEnvYA
ldx #S.PS.F.ENV+S.PS.F.HOLD
.HS 2C bit abs
K.ExecProcessYA ldx #S.PS.F.HOLD
.HS 2C bit abs
K.CreateProcessNewEnvYA
ldx #S.PS.F.ENV
.HS 2C bit abs
K.CreateProcessYA
ldx #0
stx K.CreateProcess.Flags
>STYA K.CreateProcess.CmdLine
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jsr PS.CreateChild
bcs .9
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sta .8+1
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jsr PS.Init
bcc .8
pha save error code
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lda .8+1
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jsr PS.FreeA
pla get back error code
sec
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rts
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.8 lda #$ff self modified
.9 rts
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*--------------------------------------
K.CreateProcess.Flags .BS 1
K.CreateProcess.CmdLine .BS 2
*/--------------------------------------
* # GetPSByIDA
* ## In :
* A = PID
* ## Out :
* Y,A = PTR to TSKSLOT
*\--------------------------------------
K.GetPSByIDA pha
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>LDYAI TskMgr.Table
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>STYA ZPPtr1
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pla
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beq .8
sta .20+1
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ldx #0
.1 inx
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lda ZPPtr1
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clc
adc #S.PS
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sta ZPPtr1
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bcc .2
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inc ZPPtr1+1
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.2 lda (ZPPtr1)
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bpl .3
ldy #S.PS.PID
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lda (ZPPtr1),y
.20 cmp #$ff Self Modified
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beq .8
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.3 cpx TskMgr.Count
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bne .1
.9 lda #TSKMGR.ERRNSP
sec
rts
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.8 >LDYA ZPPtr1
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clc
rts
*/--------------------------------------
* # Sleep
* Make current process suspend until next RUN
* ## In :
* (none)
* ## Out :
* (none)
*\--------------------------------------
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K.Sleep pla get PC LO
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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)
clc No error,
rts back to Kernel
*--------------------------------------
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* PS.CreateChild
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* in :
* out :
* A = PSID
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* we cannot use ZPPtrs1 & 2
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* because of calling K.NewPStrYA & S.DupEnvA
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*--------------------------------------
PS.CreateChild >LDYAI TskMgr.Table+S.PS
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>STYA ZPPtr3
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ldx #0
.1 inx
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cpx TskMgr.Count
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beq .2
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lda (ZPPtr3) Found an empty slot
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bpl .3
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lda ZPPtr3
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clc
adc #S.PS
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sta ZPPtr3
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bcc .1
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inc ZPPtr3+1
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bra .1
.2 cpx #K.PS.MAX
bne .3
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lda #TSKMGR.ERROOH
sec
rts
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.3 inc TskMgr.Count
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.4 inc TSKMGR.LASTID Get a PSID not alredy running
beq .4 not = 0
lda TSKMGR.LASTID
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jsr K.GetPSByIDA
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bcc .4
ldy #S.PS.PID
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lda TSKMGR.LASTID
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sta (ZPPtr3),y
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lda #0
ldy #S.PS.hCS
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.5 sta (ZPPtr3),y Blank Everything in this S.PS
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iny
cpy #S.PS
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bne .5
lda #S.PS.F.ENV
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bit K.CreateProcess.Flags need to create ENV & Prefix ?
beq .6 no...
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sta (ZPPtr3) Mark this PS with ENV flag
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ldy #S.PS.hPREFIX copy hPREFIX...
lda (pPs),y
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jsr K.GetMemPtrA
jsr K.NewPStrYA
bcs .9
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txa
ldy #S.PS.hPREFIX
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sta (ZPPtr3),y
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ldy #S.PS.hENV ...and hENV from parent PS
lda (pPs),y
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jsr PS.DupEnvA
bcs .9
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ldy #S.PS.hENV
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sta (ZPPtr3),y
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bra .8
.6 ldy #S.PS.hPREFIX reuse same hPREFIX...
lda (pPs),y
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sta (ZPPtr3),y
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ldy #S.PS.hENV ...and hENV from parent PS
lda (pPs),y
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sta (ZPPtr3),y
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.8 ldy #S.PS.hStdIn
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.81 lda (pPs),y
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sta (ZPPtr3),y
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iny
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cpy #S.PS.hStdErr+1
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bne .81
ldy #S.PS.PID
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lda (pPs),y
ldy #S.PS.PPID
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sta (ZPPtr3),y
lda #S.PS.F.HOLD
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bit K.CreateProcess.Flags
beq .82
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ora (pPs)
sta (pPs) HOLD parent PS if ExecProcess
.82 lda #S.PS.F.INUSE+S.PS.F.INIT
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ora (ZPPtr3)
sta (ZPPtr3) Make this PS Init....
ldy #S.PS.CPID
lda TSKMGR.LASTID
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sta (pPs),y
clc Exit with A=PSID
.9 rts
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*--------------------------------------
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PS.Init >LDYA K.CreateProcess.CmdLine
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jsr K.PStr2StrArrayYA
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bcs .9
phy save PTR to StrArray...
pha
txa
ldy #S.PS.hCMDLINE
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sta (ZPPtr3),y
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pla Restore PTR...
ply
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>SYSCALL LoadExeYA Y,A=filename full path
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bcs .9
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>STYA ZPPtr4 save PTR to Code Segment
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txa
ldy #S.PS.hCS
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sta (ZPPtr3),y save CS hMem in TSKSLOT
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ldy #H.BIN.EXE.DS.SIZE+1
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lda (ZPPtr4),y Load DS.SIZE HI
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tax
dey
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ora (ZPPtr4),y
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beq .2 DS.SIZE=0...
lda (ZPPtr4),y
tay
txa Y,A = DS.SIZE
jsr K.GetMem0YA
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bcs .9
txa
ldy #S.PS.hDS
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sta (ZPPtr3),y save DS hMem in TSKSLOT
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.2
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clc
.9 rts
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*--------------------------------------
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* PS.FreeA
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* In : A = PID to free
*--------------------------------------
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PS.FreeA jsr K.GetPSByIDA PS in ZPPtr1
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ldy #S.PS.hCMDLINE
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jsr PS.FreeA.PsY
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lda (ZPPtr1) get S.PS.F
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and #S.PS.F.ENV do we have to discard duplicated env & prefix ?
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beq .1
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ldy #S.PS.hENV
jsr PS.FreeA.PsY
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ldy #S.PS.hPREFIX
jsr PS.FreeA.PsY
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.1 ldy #S.PS.hDS
jsr PS.FreeA.PsY
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ldy #S.PS.hCS
jsr PS.FreeA.PsY
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lda #0
sta (ZPPtr1) Mark TSKSLOT as free
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clc
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PS.FreeA.RTS rts
*--------------------------------------
PS.FreeA.PsY lda (ZPPtr1),y
beq PS.FreeA.RTS
jmp K.FreeMemA
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*--------------------------------------
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* PS.SelectA
* In : A=PSID
*--------------------------------------
PS.Select0 lda #0
PS.SelectA jsr K.GetPSByIDA
bcs *
>STYA pPs
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PS.Select ldy #S.PS.hCS
lda (pPs),y
beq .1 PS=0 (kernel) has no CS/DS
jsr K.GetMemPtrA
>STYA pCode
ldy #S.PS.hDS
lda (pPs),y
beq .1
jsr K.GetMemPtrA
>STYA pData
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.1 ldy #S.PS.hStdOut
lda (pPs),y
beq .8
jsr K.GetDevByIDA
>STYA pDev
.8 clc
rts
*--------------------------------------
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* PS.DupEnvA
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* In:
* A = ENV hMem To Duplicate
* Out:
* A = hMem to new ENV
*--------------------------------------
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PS.DupEnvA jsr K.GetMemPtrA
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>STYA ZPPtr1
>LDYAI K.ENV.SIZE
jsr K.GetMemYA
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bcs .9
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>STYA ZPPtr2
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ldy #0
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.1 lda (ZPPtr1),y
sta (ZPPtr2),y
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beq .8
iny
bne .1
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inc ZPPtr1+1
inc ZPPtr2+1
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bra .1
.8 txa
clc
.9 rts
*--------------------------------------
MAN
SAVE /A2OSX.SRC/SYS/KERNEL.S.PS
LOAD /A2OSX.SRC/SYS/KERNEL.S
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ASM