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A2osX/SYS/KERNEL.S.PS.txt

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PR#3
PREFIX /A2OSX.SRC
LOMEM $A00
INC 1
AUTO 6
*/--------------------------------------
* #ExecProcessNewEnvYA
* #ExecProcessYA (Blocking Parent PID)
* #CreateProcessNewEnvYA
* #CreateProcessYA (Non Blocking)
* ##In:
* Y,A = PTR To Cmd Line
* ##Out:
* A = Child PSID
*\--------------------------------------
K.ExecProcessNewEnvYA
ldx #S.PS.F.ENV+S.PS.F.HOLD
.HS 2C bit abs
K.ExecProcessYA ldx #S.PS.F.HOLD
.HS 2C bit abs
K.CreateProcessNewEnvYA
ldx #S.PS.F.ENV
.HS 2C bit abs
K.CreateProcessYA
ldx #0
stx K.CreateProcess.Flags
>STYA K.CreateProcess.CmdLine
jsr PS.CreateChild
bcs .9
sta .8+1
jsr PS.Init
bcc .8
pha save error code
lda .8+1
jsr PS.FreeA
pla get back error code
sec
rts
.8 lda #$ff self modified
.9 rts
*--------------------------------------
K.CreateProcess.Flags .BS 1
K.CreateProcess.CmdLine .BS 2
*/--------------------------------------
* #GetPSByIDA
* ##In :
* A = PID
* ##Out :
* Y,A = PTR to TSKSLOT
*\--------------------------------------
K.GetPSByIDA pha
>LDYAI TskMgr.Table
>STYA ZPPtr1
pla
beq .8
sta .20+1
ldx #0
.1 inx
lda ZPPtr1
clc
adc #S.PS
sta ZPPtr1
bcc .2
inc ZPPtr1+1
.2 lda (ZPPtr1)
bpl .3
ldy #S.PS.PID
lda (ZPPtr1),y
.20 cmp #$ff Self Modified
beq .8
.3 cpx TskMgr.Count
bne .1
.9 lda #TSKMGR.ERRNSP
sec
rts
.8 >LDYA ZPPtr1
clc
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)
clc No error,
rts back to Kernel
*--------------------------------------
* PS.CreateChild
* in :
* out :
* A = PSID
* we cannot use ZPPtrs1 & 2
* because of calling K.NewPStrYA & S.DupEnvA
*--------------------------------------
PS.CreateChild >LDYAI TskMgr.Table+S.PS
>STYA ZPPtr3
ldx #0
.1 inx
cpx TskMgr.Count
beq .2
lda (ZPPtr3) Found an empty slot
bpl .3
lda ZPPtr3
clc
adc #S.PS
sta ZPPtr3
bcc .1
inc ZPPtr3+1
bra .1
.2 cpx #K.PS.MAX
bne .3
lda #TSKMGR.ERROOH
sec
rts
.3 inc TskMgr.Count
.4 inc TSKMGR.LASTID Get a PSID not alredy running
beq .4 not = 0
lda TSKMGR.LASTID
jsr K.GetPSByIDA
bcc .4
ldy #S.PS.PID
lda TSKMGR.LASTID
sta (ZPPtr3),y
lda #0
ldy #S.PS.hCS
.5 sta (ZPPtr3),y Blank Everything in this S.PS
iny
cpy #S.PS
bne .5
lda #S.PS.F.ENV
bit K.CreateProcess.Flags need to create ENV & Prefix ?
beq .6 no...
sta (ZPPtr3) Mark this PS with ENV flag
ldy #S.PS.hPREFIX copy hPREFIX...
lda (pPs),y
jsr K.GetMemPtrA
jsr K.NewPStrYA
bcs .9
txa
ldy #S.PS.hPREFIX
sta (ZPPtr3),y
ldy #S.PS.hENV ...and hENV from parent PS
lda (pPs),y
jsr PS.DupEnvA
bcs .9
ldy #S.PS.hENV
sta (ZPPtr3),y
bra .8
.6 ldy #S.PS.hPREFIX reuse same hPREFIX...
lda (pPs),y
sta (ZPPtr3),y
ldy #S.PS.hENV ...and hENV from parent PS
lda (pPs),y
sta (ZPPtr3),y
.8 ldy #S.PS.hStdIn
.81 lda (pPs),y
sta (ZPPtr3),y
iny
cpy #S.PS.hStdErr+1
bne .81
ldy #S.PS.PID
lda (pPs),y
ldy #S.PS.PPID
sta (ZPPtr3),y
lda #S.PS.F.HOLD
bit K.CreateProcess.Flags
beq .82
ora (pPs)
sta (pPs) HOLD parent PS if ExecProcess
.82 lda #S.PS.F.INUSE+S.PS.F.INIT
ora (ZPPtr3)
sta (ZPPtr3) Make this PS Init....
ldy #S.PS.CPID
lda TSKMGR.LASTID
sta (pPs),y
clc Exit with A=PSID
.9 rts
*--------------------------------------
PS.Init >LDYA K.CreateProcess.CmdLine
jsr K.PStr2StrArrayYA
bcs .9
phy save PTR to StrArray...
pha
txa
ldy #S.PS.hCMDLINE
sta (ZPPtr3),y
pla Restore PTR...
ply
>SYSCALL LoadExeYA Y,A=filename full path
bcs .9
>STYA ZPPtr4 save PTR to Code Segment
txa
ldy #S.PS.hCS
sta (ZPPtr3),y save CS hMem in TSKSLOT
ldy #H.BIN.EXE.DS.SIZE+1
lda (ZPPtr4),y Load DS.SIZE HI
tax
dey
ora (ZPPtr4),y
beq .2 DS.SIZE=0...
lda (ZPPtr4),y
>PUSHAX Push DS.SIZE
>PUSHBI S.MEM.F.INIT0 Clear DS
jsr K.GetMem
bcs .9
txa
ldy #S.PS.hDS
sta (ZPPtr3),y save DS hMem in TSKSLOT
.2
clc
.9 rts
*--------------------------------------
* PS.FreeA
* In : A = PID to free
*--------------------------------------
PS.FreeA jsr K.GetPSByIDA PS in ZPPtr1
ldy #S.PS.hCMDLINE
jsr PS.FreeA.PsY
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 PS.FreeA.PsY
ldy #S.PS.hPREFIX
jsr PS.FreeA.PsY
.1 ldy #S.PS.hDS
jsr PS.FreeA.PsY
ldy #S.PS.hCS
jsr PS.FreeA.PsY
lda #0
sta (ZPPtr1) Mark TSKSLOT as free
clc
PS.FreeA.RTS rts
*--------------------------------------
PS.FreeA.PsY lda (ZPPtr1),y
beq PS.FreeA.RTS
jmp K.FreeMemA
*--------------------------------------
* PS.SelectA
* In : A=PSID
*--------------------------------------
PS.Select0 lda #0
PS.SelectA jsr K.GetPSByIDA
bcs *
>STYA pPs
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
.1 ldy #S.PS.hStdOut
lda (pPs),y
beq .8
jsr K.GetDevByIDA
>STYA pDev
.8 clc
rts
*--------------------------------------
* PS.DupEnvA
* In:
* A = ENV hMem To Duplicate
* Out:
* A = hMem to new ENV
*--------------------------------------
PS.DupEnvA jsr K.GetMemPtrA
>STYA ZPPtr1
>PUSHWI K.ENV.SIZE
>PUSHBI 0
jsr K.GetMem
bcs .9
>STYA ZPPtr2
ldy #0
.1 lda (ZPPtr1),y
sta (ZPPtr2),y
beq .8
iny
bne .1
inc ZPPtr1+1
inc ZPPtr2+1
bra .1
.8 txa
clc
.9 rts
*--------------------------------------
MAN
SAVE SYS/KERNEL.S.PS
LOAD SYS/KERNEL.S
ASM
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