mirror of
https://github.com/A2osX/A2osX.git
synced 2024-11-22 16:31:07 +00:00
504 lines
11 KiB
Plaintext
504 lines
11 KiB
Plaintext
NEW
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AUTO 3,1
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*--------------------------------------
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ZPMemMgrSPtr .EQ ZPMEMMGR Pointer To Slot selected
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ZPMemMgrTmp1 .EQ ZPMEMMGR+2
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ZPMemMgrSize .EQ ZPMEMMGR+4
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*/--------------------------------------
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* # GetMem0
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* Y,A = Size Requested
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* ## RETURN VALUE
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* CC : success
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* YA = PTR to Mem (ZERO Initialised)
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* X = hMem
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* CS :
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* A = EC
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*\--------------------------------------
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MEM.ReqFlags .BS 1 store requested Flags
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MEM.BestSlot .BS 1
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*MEM.BestScore .BS 2
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MEM.BestScore .EQ ZPMemMgrTmp1
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*--------------------------------------
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K.GetMem0 ldx #S.MEM.F.INIT0
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.HS 2C bit abs
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*/--------------------------------------
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* # GetMem
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* Y,A = Size Requested
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* ## RETURN VALUE
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* CC : success
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* YA = PTR to Mem (Uninitialised)
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* X = hMem
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* CS :
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* A = EC
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*\--------------------------------------
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K.GetMem ldx #0
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MEM.GetMem.YAX stx MEM.ReqFlags
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sta ZPMemMgrSize+1
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tya
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bit #K.MEM.ALIGN-1 aligned ?
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beq .10 yes, request it
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and #K.MEM.nALIGNm1 align on boundary
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clc
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adc #K.MEM.ALIGN
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bcc .10
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inc ZPMemMgrSize+1
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.10 sta ZPMemMgrSize
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>LDYAI Mem.Table
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>STYA ZPMemMgrSPtr
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stz MEM.BestSlot
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ldx #$ff
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stx MEM.BestScore
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stx MEM.BestScore+1
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ldx #0 Current slot=0
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bra .4 skip slot 0, Check if some free slot to reuse first
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.1 inx move to next slot
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jsr Mem.NextSlot
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lda (ZPMemMgrSPtr) Get Flags
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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
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beq .21
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ldy ZPMemMgrSize+1 > 255, not applicable
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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
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clc
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adc ZPMemMgrSize
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bcs .4 cross page boundary....
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lda MEM.ReqFlags get back flags to test if match
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.21 bit #S.MEM.F.ALIGN is request needs a page align ?
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beq .3
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.22 ldy #S.MEM.PTR
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lda (ZPMemMgrSPtr),y get LO of PTR
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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
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pha
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iny
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lda (ZPMemMgrSPtr),y
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sbc ZPMemMgrSize+1
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ply Y,A = SlotLen - ReqSize
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bcc .4 req size > slot size
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cpy MEM.BestScore
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pha
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sbc MEM.BestScore+1
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pla
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bcs .4 Delta is >= BestScore
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bne .4 Delta is > 255...
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sty MEM.BestScore
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sta MEM.BestScore+1
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stx MEM.BestSlot
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.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
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beq .5
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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
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beq .51
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lda ZPMemMgrSize+1 > 255, not applicable
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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
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bcs .6 yes, allocate
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tay no, reserve a free slot to fill gap
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lda #0
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jsr Mem.AddSlot X = new slot
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bcs .9
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lda #S.MEM.F.NOCROSS Make sure marked FREE
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sta (ZPMemMgrSPtr)
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bra .6
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.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
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sbc ZPMemMgrSize
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beq .6 yes, allocate
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tay no, reserve a free slot to fill gap
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lda #0
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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
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sta (ZPMemMgrSPtr)
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.6 >LDYA ZPMemMgrSize
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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
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sta (ZPMemMgrSPtr)
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and #S.MEM.F.INIT0
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beq .8
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jsr MEM.Init0
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.8 lda #0
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ldy #S.MEM.BIN
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sta (ZPMemMgrSPtr),y
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inc Mark this slot used by one process
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ldy #S.MEM.REFCNT
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sta (ZPMemMgrSPtr),y
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ldy #S.PS.PID
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lda (pPs),y
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ldy #S.MEM.OWNERPID
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sta (ZPMemMgrSPtr),y
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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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*--------------------------------------
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* Mem.AddSlot
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* In:
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* Y,A = Requested size
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* Out:
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*--------------------------------------
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Mem.AddSlot >STYA ZPMemMgrTmp1 save req size
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ldx Mem.LastSlot
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inx
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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
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tay save new Mem.Free LO
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lda Mem.Free+1
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sbc ZPMemMgrTmp1+1
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pha save new Mem.Free HI
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cpy Mem.LoMem
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sbc Mem.LoMem+1
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bcc .98 ERR out of mem
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jsr Mem.NextSlot X,Y unmodified
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tya get back Mem.Free LO
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ldy #S.MEM.PTR
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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
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pla get back Mem.Free HI
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sta Mem.Free+1
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sta (ZPMemMgrSPtr),y
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iny
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lda ZPMemMgrTmp1 get requested size
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sta (ZPMemMgrSPtr),y setup slot LEN
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iny
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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
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rts
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.98 pla discard new Mem.Free HI
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.99 lda #E.OOM
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sec
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rts
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*--------------------------------------
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MEM.NextSlot lda ZPMemMgrSPtr
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clc
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adc #S.MEM
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sta ZPMemMgrSPtr
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bcc .8
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inc ZPMemMgrSPtr+1
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.8 rts
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*--------------------------------------
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MEM.Init0 phx
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ldy #S.MEM.PTR
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lda (ZPMemMgrSPtr),y ZPMemMgrSPtr already set
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sta .12+1
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iny
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lda (ZPMemMgrSPtr),y
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sta .12+2
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lda ZPMemMgrSize
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eor #$ff
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tay y=not lo count
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lda ZPMemMgrSize+1
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eor #$ff a=not hi count
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ldx #0
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.11 iny
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bne .12
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inc
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beq .13
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.12 stz $ffff,x
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inx
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bne .11
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inc .12+2
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bra .11
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.13 plx
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rts
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*/--------------------------------------
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* # FreeMem
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* A = hMem To Free
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* ## RETURN VALUE
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* none.
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* (X unmodified)
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*\--------------------------------------
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K.FreeMem.MSG .AZ "FreeMem:hMem=$%h,PID=%d\r\n"
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*--------------------------------------
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K.FreeMem.ERR phx
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phy hMem n Y
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ldy #S.PS.PID
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lda (pPS),y
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>PUSHA
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pla
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>PUSHA
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>PUSHBI 2
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>LDYAI K.FreeMem.MSG
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.1 ldx #SYS.printf
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jsr K.SYSCALL2
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plx
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lda #E.INVH
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* >DEBUG
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sec
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rts
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*--------------------------------------
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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
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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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jsr MEM.DecRefCnt only one left ?
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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 #S.MEM.F.CODE CS: Any BINPATH to discard ?
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sta (ZPMemMgrSPtr) Mark as FREE
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beq .1
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ldy #S.MEM.BIN
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lda (ZPMemMgrSPtr),y
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jsr MEM.GetMemByID X unmodified
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* lda (ZPMemMgrSPtr)
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* 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)
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bmi .8 used, exit
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.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
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lda (ZPMemMgrSPtr)
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bpl .2 free again! loop
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ldy #S.MEM.PTR
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lda (ZPMemMgrSPtr),y set Mem.Free...
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sta Mem.Free
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iny
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lda (ZPMemMgrSPtr),y
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sta Mem.Free+1
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.8 clc
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rts
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.80 >LDYA Mem.HiMem
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>STYA Mem.Free
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clc
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rts
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*/--------------------------------------
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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
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* (X unmodified)
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*\--------------------------------------
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* Optimized for :
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* Mem.Table is page aligned at $800
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* S.MEM is 8 bytes
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*--------------------------------------
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.DO Mem.Table=$800
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.ELSE
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!!!!!WARNING!!!!!
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.FIN
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.DO S.MEM=8
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.ELSE
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!!!!!WARNING!!!!!
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.FIN
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*--------------------------------------
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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
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pha
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iny
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lda (ZPMemMgrSPtr),y
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ply
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rts
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*--------------------------------------
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MEM.GetMemByID sta ZPMemMgrSPtr
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lda /Mem.Table/8
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asl ZPMemMgrSPtr
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rol
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asl ZPMemMgrSPtr
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rol
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asl ZPMemMgrSPtr
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rol
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sta ZPMemMgrSPtr+1
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rts
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*--------------------------------------
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Mem.SetOwner ldy #S.MEM.OWNERPID
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lda CORE.LastPSID
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sta (ZPMemMgrSPtr),y
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rts
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*--------------------------------------
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Mem.IncRefCnt ldy #S.MEM.REFCNT
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lda (ZPMemMgrSPtr),y
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inc
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sta (ZPMemMgrSPtr),y
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rts
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*--------------------------------------
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Mem.DecRefCnt ldy #S.MEM.REFCNT
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lda (ZPMemMgrSPtr),y
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dec
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sta (ZPMemMgrSPtr),y
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rts
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*/--------------------------------------
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* # NewStkObj
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* Y,A = Size Requested
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* ## RETURN VALUE
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* CC : success
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* YA = PTR to Mem (Uninitialised)
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* X = hMem
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* CS :
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* A = EC
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*\--------------------------------------
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*/--------------------------------------
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* # LoadStkObj
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* Load a file in AUX memory (Stock Objects)
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* PUSHW = AUXTYPE (Handled by....
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* PUSHB = TYPE ...
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* PUSHB = MODE ...
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* LDYA = PATH ...FOpen)
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* ## RETURN VALUE
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* Y,A = File Length
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* X = hMem of Loaded Object in AUX mem
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*\--------------------------------------
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K.LoadStkObj ldx #SYS.LoadTxtFile To get ending \0
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jsr K.SYSCALL2
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bcs .99
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sty .81+1 Save File Len
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sta .82+1
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stx .8+1 Save MAIN hMem
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iny
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bne .1
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inc +1 for ending 0
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.1 >STYA A2L Save LEN temporarly
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ldx #SYS.NewStkObj
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jsr K.SYSCALL2
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bcs .9
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stx .80+1
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>STYA A4L Save Destination Address in AUX
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lda .8+1
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jsr K.GetMemPtr
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>STYA A1L Save MAIN base Ptr
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pha Add Allocated LEN
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tya
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clc
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adc A2L
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sta A2L
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pla
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adc A2L+1
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sta A2L+1 to get End address in A2L/H
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sec Main To Aux
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jsr AuxMove
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.8 lda #$ff SELF MODIFIED
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jsr K.FreeMem release MAIN memory
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.80 ldx #$ff Returns AUX hMem
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.81 ldy #$ff and file len in Y,A
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.82 lda #$ff
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* clc
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rts
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.9 pha
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jsr .8
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pla
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sec
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.99 rts
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*/--------------------------------------
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* # GetStkObjPtr
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* ## ASM
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* `lda hStkObj`
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* `>SYSCALL GetStkObjPtr`
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* ## RETURN VALUE
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*\--------------------------------------
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*/--------------------------------------
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* # FreeStkObj
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* A = hMem To Free (AUX Memory)
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* ## RETURN VALUE
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* none.
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* (X,Y unmodified)
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*\--------------------------------------
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*--------------------------------------
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MEM.GetKrnlBuf pha
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tya
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clc
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adc DevMgr.Free
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tax
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pla
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adc DevMgr.Free+1
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bcs .99 we crossed $FFFF, out of mem
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cpx #DevMgr.HiMem
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pha
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sbc /DevMgr.HiMem
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pla
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bcs .99 No More Room...
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ldy DevMgr.Free
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stx DevMgr.Free
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ldx DevMgr.Free+1
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sta DevMgr.Free+1
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txa
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* clc
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rts
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.99 lda #E.OOM
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* sec
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rts
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*--------------------------------------
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MAN
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SAVE USR/SRC/SYS/KERNEL.S.MEM
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LOAD USR/SRC/SYS/KERNEL.S
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ASM
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