A2osX/SYS/KERNEL.S.MEM.txt

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NEW
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AUTO 3,1
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*--------------------------------------
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ZPMemMgrSPtr .EQ ZPMEMMGR Pointer To Slot selected
ZPMemMgrTmp1 .EQ ZPMEMMGR+2
ZPMemMgrSize .EQ ZPMEMMGR+4
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MEM.ReqFlags .EQ ZPMEMMGR+6 store requested Flags
MEM.BestSlot .EQ ZPMEMMGR+7
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MEM.BestScore .EQ ZPMemMgrTmp1
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*/--------------------------------------
* # Realloc
* ## C
* `void *realloc(short int hMem, int size);`
* ## ASM
* `>PUSHB hMem`
* `>PUSHW size`
* `>SYSCALL realloc`
* ## RETURN VALUE
* YA = ptr
* X = hMem
*\--------------------------------------
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MEM.NewSize .BS 2
*--------------------------------------
K.Realloc >PULLW MEM.NewSize
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>PULLA Src hMem
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tax
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jsr MEM.GetMemByID
ldy #S.MEM.LEN
lda (ZPMemMgrSPtr),y
pha
iny
lda (ZPMemMgrSPtr),y
ply
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jsr MEM.MoveToAux x = Src hMem, YA = Old size
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bcs .99
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stx .7+1 Aux hMem
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>LDYA MEM.NewSize
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>STYA A2L size for MoveSetupA1A2
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jsr K.getmem
bcs .99
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stx .8+1 new main hMem to return
>STYA A4L Save MAIN Ptr
lda .7+1
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sta SETREADAUX
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jsr MEM.SetA1A2 Setup AUX base & End Ptrs
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sta CLRREADAUX
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clc Aux To Main
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jsr XMov
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.7 lda #$ff SELF MODIFIED
>SYSCALL2 FreeStkObj
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.8 lda #$ff SELF MODIFIED
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tax X = new hMem
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jmp k.GetMemPtr YA = new ptr
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.99 rts
*/--------------------------------------
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* # GetMem
* Y,A = Size Requested
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* ## RETURN VALUE
* CC : success
* YA = PTR to Mem (Uninitialised)
* X = hMem
* CS :
* A = EC
*\--------------------------------------
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K.GetMem0 ldx #S.MEM.F.INIT0
.HS 2C BIT ABS
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K.GetMem ldx #0
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MEM.GetMem.YAX stx MEM.ReqFlags
sta ZPMemMgrSize+1
tya
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bit #K.MEM.ALIGN-1 aligned ?
beq .10 yes, request it
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and #K.MEM.nALIGNm1 align on boundary
clc
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adc #K.MEM.ALIGN
bcc .10
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inc ZPMemMgrSize+1
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.10 sta ZPMemMgrSize
>LDYAI Mem.Table
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>STYA ZPMemMgrSPtr
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stz MEM.BestSlot
ldx #$ff
stx MEM.BestScore
stx MEM.BestScore+1
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ldx #0 Current slot=0
bra .4 skip slot 0, Check if some free slot to reuse first
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.1 inx move to next slot
jsr Mem.NextSlot
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lda (ZPMemMgrSPtr) Get Flags
bmi .4 in use ?
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.2 lda MEM.ReqFlags Found an empty slot
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bit #S.MEM.F.NOCROSS
beq .21
ldy ZPMemMgrSize+1 > 255, not applicable
bne .22 Align to page if $100
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ldy #S.MEM.PTR
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lda (ZPMemMgrSPtr),y get LO of PTR
clc
adc ZPMemMgrSize
bcs .4 cross page boundary....
lda MEM.ReqFlags get back flags to test if match
.21 bit #S.MEM.F.ALIGN is request needs a page align ?
beq .3
.22 ldy #S.MEM.PTR
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lda (ZPMemMgrSPtr),y get LO of PTR
bne .4 not page-aligned
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.3 ldy #S.MEM.LEN
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sec
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lda (ZPMemMgrSPtr),y get LEN of this block
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sbc ZPMemMgrSize compare with requested size
pha
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iny
lda (ZPMemMgrSPtr),y
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sbc ZPMemMgrSize+1
ply Y,A = SlotLen - ReqSize
bcc .4 req size > slot size
cpy MEM.BestScore
pha
sbc MEM.BestScore+1
pla
bcs .4 Delta is >= BestScore
bne .4 Delta is > 255...
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sty MEM.BestScore
sta MEM.BestScore+1
stx MEM.BestSlot
.4 cpx Mem.LastSlot any other slot to check?
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bne .1 last one, create a new slot
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lda MEM.BestSlot
beq .5
tax
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jsr MEM.GetMemByID
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bra .7
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*-------------- Create a New SLOT
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.5 lda MEM.ReqFlags
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bit #S.MEM.F.NOCROSS
beq .51
lda ZPMemMgrSize+1 > 255, not applicable
bne .52 Align to page if $100
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lda Mem.Free target PTR will be in same page ?
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beq .6 Memfree is xx00, will be in same page
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cmp ZPMemMgrSize
bcs .6 yes, allocate
tay no, reserve a free slot to fill gap
lda #0
jsr Mem.AddSlot X = new slot
bcs .9
lda #S.MEM.F.NOCROSS Make sure marked FREE
sta (ZPMemMgrSPtr)
bra .6
.51 bit #S.MEM.F.ALIGN is request needs a page align ?
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beq .6
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.52 lda Mem.Free target PTR will be page aligned ?
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sec
sbc ZPMemMgrSize
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beq .6 yes, allocate
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tay no, reserve a free slot to fill gap
lda #0
jsr Mem.AddSlot X = new slot
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bcs .9
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lda #S.MEM.F.ALIGN Make sure marked FREE
sta (ZPMemMgrSPtr)
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.6 >LDYA ZPMemMgrSize
jsr Mem.AddSlot X = new slot
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bcs .9
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*-------------- Reuse this SLOT
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.7 lda MEM.ReqFlags get requested flags
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ora #S.MEM.F.INUSE mark as in use
sta (ZPMemMgrSPtr)
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and #S.MEM.F.INIT0
beq .8
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jsr MEM.Init0
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.8 lda #0
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ldy #S.MEM.BIN
sta (ZPMemMgrSPtr),y
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inc Mark this slot used by one process
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ldy #S.MEM.REFCNT
sta (ZPMemMgrSPtr),y
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lda RDREADAUX
pha
sta CLRREADAUX
ldy #S.PS.PID
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lda (pPS),y
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ldy #S.MEM.OWNERPID
sta (ZPMemMgrSPtr),y
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pla
bpl .80
sta SETREADAUX
.80 clc
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jmp MEM.GetMEMPTR
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* A = HI PTR,Y = LO PTR,X = Current hMem
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.9 rts
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*--------------------------------------
* Mem.AddSlot
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* In:
* Y,A = Requested size
* Out:
*--------------------------------------
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Mem.AddSlot >STYA ZPMemMgrTmp1 save req size
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ldx Mem.LastSlot
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inx
beq .99 > 255 ERR:OUT OF SLOT
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lda Mem.Free Compute base PTR=FREE-REQ size
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sec
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sbc ZPMemMgrTmp1
tay save new Mem.Free LO
lda Mem.Free+1
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sbc ZPMemMgrTmp1+1
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pha save new Mem.Free HI
cpy Mem.LoMem
sbc Mem.LoMem+1
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bcc .98 ERR out of mem
jsr Mem.NextSlot X,Y unmodified
tya get back Mem.Free LO
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ldy #S.MEM.PTR
sta Mem.Free set as system Mem.Free value
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sta (ZPMemMgrSPtr),y store it as base address of new slot
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iny
pla get back Mem.Free HI
sta Mem.Free+1
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sta (ZPMemMgrSPtr),y
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iny
lda ZPMemMgrTmp1 get requested size
sta (ZPMemMgrSPtr),y setup slot LEN
iny
lda ZPMemMgrTmp1+1
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sta (ZPMemMgrSPtr),y
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stx Mem.LastSlot mark this slot allocated
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clc
rts
.98 pla discard new Mem.Free HI
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.99 lda #E.OOM
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sec
rts
*--------------------------------------
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MEM.NextSlot lda ZPMemMgrSPtr
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clc
adc #S.MEM
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sta ZPMemMgrSPtr
bcc .8
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inc ZPMemMgrSPtr+1
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.8 rts
*--------------------------------------
MEM.Init0 phx
ldy #S.MEM.PTR
lda (ZPMemMgrSPtr),y ZPMemMgrSPtr already set
sta .12+1
iny
lda (ZPMemMgrSPtr),y
sta .12+2
lda ZPMemMgrSize
eor #$ff
tay y=not lo count
lda ZPMemMgrSize+1
eor #$ff a=not hi count
ldx #0
.11 iny
bne .12
inc
beq .13
.12 stz $ffff,x
inx
bne .11
inc .12+2
bra .11
.13 plx
rts
*/--------------------------------------
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* # FreeMem
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* A = hMem To Free
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* ## RETURN VALUE
* none.
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* (X unmodified)
*\--------------------------------------
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K.FreeMem.ERR >PUSHWI .1
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tya hMem n Y
>PUSHA
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* >DEBUG
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ldy #S.PS.PID
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lda (pPS),y
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>PUSHA
>PUSHBI 2
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>SYSCALL2 printf
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lda #E.INVH
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sec
rts
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.1 .AZ "Free($%h),PID=%d\r\n"
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*--------------------------------------
K.FreeMem tay
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beq K.FreeMem.ERR Slot=0, reserved by Kernel
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cmp Mem.LastSlot
bcc .10
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bne K.FreeMem.ERR
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.10 jsr MEM.GetMemByID X,Y unmodified
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lda (ZPMemMgrSPtr) In use ?
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bpl K.FreeMem.ERR
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ldy #S.MEM.REFCNT
lda (ZPMemMgrSPtr),y
dec only one left ?
sta (ZPMemMgrSPtr),y
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bne .8 no, must be a code segment loaded several times
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lda (ZPMemMgrSPtr)
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and #$7f keep flags for memdump
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sta (ZPMemMgrSPtr) Mark as FREE
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and #S.MEM.F.CODE CS: Any BINPATH to discard ?
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beq .1
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ldy #S.MEM.BIN
lda (ZPMemMgrSPtr),y
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jsr MEM.GetMemByID X unmodified
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* lda (ZPMemMgrSPtr)
* bpl * ***MUST BE ALLOCATED***
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lda #0 mark BINPATH slot as free
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sta (ZPMemMgrSPtr)
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.1 lda Mem.LastSlot
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beq .8
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jsr MEM.GetMemByID X unmodified
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lda (ZPMemMgrSPtr)
bmi .8 used, exit
.2 dec Mem.LastSlot free! get previous....
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beq .80 empty list: go set Mem.Free=Mem.HiMem
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lda Mem.LastSlot
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jsr MEM.GetMemByID X unmodified
lda (ZPMemMgrSPtr)
bpl .2 free again! loop
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ldy #S.MEM.PTR
lda (ZPMemMgrSPtr),y set Mem.Free...
sta Mem.Free
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iny
lda (ZPMemMgrSPtr),y
sta Mem.Free+1
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.8 clc
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rts
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.80 >LDYA Mem.HiMem
>STYA Mem.Free
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clc
rts
*/--------------------------------------
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* # GetMemPtr
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* A = hMem
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* ## RETURN VALUE
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* Y,A = PTR to MemBlock
* (X unmodified)
*\--------------------------------------
* Optimized for :
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* Mem.Table is page aligned at $800
* S.MEM is 8 bytes
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*--------------------------------------
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.DO Mem.Table=$800
.ELSE
!!!!!WARNING!!!!!
.FIN
.DO S.MEM=8
.ELSE
!!!!!WARNING!!!!!
.FIN
*--------------------------------------
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K.GetMemPtr jsr MEM.GetMemByID
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MEM.GetMEMPTR ldy #S.MEM.PTR
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lda (ZPMemMgrSPtr),y
pha
iny
lda (ZPMemMgrSPtr),y
ply
rts
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*--------------------------------------
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MEM.GetMemByID sta ZPMemMgrSPtr
lda /Mem.Table/8
asl ZPMemMgrSPtr
rol
asl ZPMemMgrSPtr
rol
asl ZPMemMgrSPtr
rol
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sta ZPMemMgrSPtr+1
rts
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*--------------------------------------
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Mem.SetOwner lda CORE.LastPSID
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.HS 2C BIT ABS
Mem.SetOwnerPS0 lda #0
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ldy #S.MEM.OWNERPID
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sta (ZPMemMgrSPtr),y
rts
*--------------------------------------
Mem.IncRefCnt ldy #S.MEM.REFCNT
lda (ZPMemMgrSPtr),y
inc
sta (ZPMemMgrSPtr),y
rts
*/--------------------------------------
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* # NewStkObj
* Y,A = Size Requested
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* ## RETURN VALUE
* CC : success
* YA = PTR to Mem (Uninitialised)
* X = hMem
* CS :
* A = EC
*\--------------------------------------
*/--------------------------------------
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* # GetStkObjPtr
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* ## ASM
* `lda hStkObj`
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* `>SYSCALL GetStkObjPtr`
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* ## RETURN VALUE
*\--------------------------------------
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*/--------------------------------------
* # FreeStkObj
* A = hMem To Free (AUX Memory)
* ## RETURN VALUE
* none.
* (X,Y unmodified)
*\--------------------------------------
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*--------------------------------------
MEM.DupX sta SETREADAUX
sta SETWRITEAUX
jsr MEM.Dup
sta CLRREADAUX
sta CLRWRITEAUX
rts
*--------------------------------------
MEM.Dup jsr K.GetMemPtr
>STYA A1L
ldy #S.MEM.LEN
lda (ZPMemMgrSPtr),y
pha
eor #$ff
sta A4L
iny
lda (ZPMemMgrSPtr),y
eor #$ff
sta A4L+1
eor #$ff
ply
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MEM.DupA1LnA4L jsr K.GetMem
bcs MEM.Dup.RTS
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>STYA A2L
ldy #0
.1 inc A4L
bne .2
inc A4L+1
beq .8
.2 lda (A1L),y
sta (A2L),y
iny
bne .1
inc A1L+1
inc A2L+1
bra .1
.8 txa
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* clc
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MEM.Dup.RTS rts
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*--------------------------------------
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MEM.CopyToMain clc
.HS B0 BCS
MEM.MoveToMain sec
ror .1+1
stx .2+1 Save AUX hMem
>STYA A2L Save LEN to copy/move
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sta CLRREADAUX Make sure MAIN !!!!
sta CLRWRITEAUX
jsr K.GetMem
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bcs MEM.Dup.RTS
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stx .8+1 Save MAIN hMem
>STYA A4L Save MAIN Ptr
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lda .2+1 Get AUX mem Ptr
sta SETREADAUX
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jsr MEM.SetA1A2 Setup AUX base & End Ptrs
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sta CLRREADAUX
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clc Aux To Main
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jsr XMov
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.1 lda #$ff SELF MODIFIED
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bpl .8 Copy : dont discard AUX mem
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.2 lda #$ff SELF MODIFIED
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>SYSCALL2 FreeStkObj release AUX mem
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.8 ldx #$ff Returns MAIN hMem
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txa
jmp K.GetMemPtr Y,A = Ptr
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*--------------------------------------
MEM.MoveToAux stx .1+1 Save MAIN hMem
>STYA A2L Save LEN to move
>SYSCALL2 NewStkObj
bcs .9
stx .8+1 Save AUX hMem
>STYA A4L Save AUX Ptr
lda .1+1
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jsr MEM.SetA1A2 Setup MAIN base & End Ptrs
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sec Main To Aux
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jsr XMov
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.1 lda #$ff SELF MODIFIED
jsr K.FreeMem release MAIN memory
.8 ldx #$ff Returns AUX hMem
* clc
.9 rts
*--------------------------------------
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MEM.SetA1A2 jsr K.GetMemPtr
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>STYA A1L Start Address
pha
tya
clc
adc A2L
tay
pla
adc A2L+1
sta A2L+1
tya
bne .1
dec A2L+1
.1 dey
sty A2L
rts
*--------------------------------------
2015-03-14 21:48:35 +00:00
MAN
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SAVE usr/src/sys/kernel.s.mem
LOAD usr/src/sys/kernel.s
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ASM