A2osX/SYS/KERNEL.S.MEM.txt
2016-06-07 08:10:18 +02:00

417 lines
8.9 KiB
Plaintext
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

PR#3
PREFIX /A2OSX.SRC
NEW
INC 1
AUTO 6
.LIST OFF
*--------------------------------------
* !!!!!!!! DO NOT USE VCPU16 !!!!!!!!
* !!!!!! DO NOT USE ZPQuickPTRs !!!!!
*--------------------------------------
ZPMemMgrSPtr .EQ ZPMemMgr Pointer To Slot selected
ZPMemMgrTmp1 .EQ ZPMemMgr+2
ZPMemMgrTmp2 .EQ ZPMemMgr+4
ZPMemMgrTmp3 .EQ ZPMemMgr+6
*--------------------------------------
* TODO :
* - Create a 256 bytes table
* mapping hMem's to real memory blocks to help
* Garbage collector move blocks
* - mem.ID=0 always used! useful to test if hMem=0
*--------------------------------------
* PUBLIC
*--------------------------------------
* S.GetMem
* In:
* PULLB = FLAGS
* PULLW = Size Requested
* Out:
* YA = PTR to Mem
* X = S.MEM.ID
* CS on err
*--------------------------------------
S.GetMem >PULLB MemMgr.ReqFlags store requested flags
and #S.MEM.F.AUX
beq .11
sta SETREADAUX Aux Mem requested,switch to AUX
sta SETWRITEAUX
.11 >PULLW MemMgr.ReqSize Store requested size
lda MemMgr.ReqSize align REQS to 16 bytes
and #$0F
beq .10
lda MemMgr.ReqSize
and #$F0
clc
adc #$10
sta MemMgr.ReqSize
bcc .10
inc MemMgr.ReqSize+1
.10 >LDYAI MemMgr.Table
>STYA ZPMemMgrSPtr
ldx #0 Current slot=0
lda MemMgr.LastSlot Check if some free slot to reuse first
beq .41
sta MemMgr.SlotCnt
.1 inx move to next slot
jsr MemMgr.NextSlot
lda (ZPMemMgrSPtr) Get Flags
bmi .4 in use ?
.2 lda MemMgr.ReqFlags Found an empty slot
and #S.MEM.F.ALIGN is request needs a page align ?
beq .3
ldy #S.MEM.PTR
lda (ZPMemMgrSPtr),y get LO of PTR
bne .4 not page-aligned
.3 ldy #S.MEM.LEN
lda (ZPMemMgrSPtr),y get LEN of this block
cmp MemMgr.ReqSize compare with requested size
bne .4
iny
lda (ZPMemMgrSPtr),y
cmp MemMgr.ReqSize+1
beq .7 requested size matches slot size !!!
.4 dec MemMgr.SlotCnt any other slot to check?
bne .1 last one, create a new slot
*-------------- Create a New SLOT
.41 lda MemMgr.ReqFlags
and #S.MEM.F.ALIGN is request needs a page align ?
beq .6
lda MemMgr.Free target PTR will be page aligned ?
sec
sbc MemMgr.ReqSize
beq .6 yes, allocate
tay no, reserve a free slot to fill gap
lda #0
jsr MemMgr.AddSlot X = new slot
bcs .9
.6 >LDYA MemMgr.ReqSize
jsr MemMgr.AddSlot X = new slot
bcs .9
*-------------- Reuse this SLOT
.7 lda MemMgr.ReqFlags get requested flags
ora #S.MEM.F.INUSE mark as in use
sta (ZPMemMgrSPtr)
and #S.MEM.F.INIT0
beq .8
jsr MemMgr.Init0
.8 lda #0
ldy #S.MEM.BIN
sta (ZPMemMgrSPtr),y
inc Mark this slot used by one process
ldy #S.MEM.REFCNT
sta (ZPMemMgrSPtr),y
ldy #S.PS.ID
lda (pPs),y
ldy #S.MEM.OWNERPID
sta (ZPMemMgrSPtr),y
ldy #S.MEM.PTR
lda (ZPMemMgrSPtr),y
pha
iny
lda (ZPMemMgrSPtr),y A = HI PTR
ply Y = LO PTR
clc X = Current hMem
.9 bit MemMgr.ReqFlags
bpl .99
sta CLRREADAUX
sta CLRWRITEAUX
.99 rts
*--------------------------------------
* MemMgr.AddSlot
* In:
* Y,A = Requested size
* Out:
*--------------------------------------
MemMgr.AddSlot >STYA ZPMemMgrTmp1 save req size
ldx MemMgr.LastSlot
inx
beq .99 > 255 ERR:OUT OF SLOT
lda MemMgr.Free Compute base PTR=FREE-REQ size
sec
sbc ZPMemMgrTmp1
sta ZPMemMgrTmp2 store new MemMgr.Free in ZPMemMgrTmp2
lda MemMgr.Free+1
sbc ZPMemMgrTmp1+1
sta ZPMemMgrTmp2+1
lda ZPMemMgrTmp2 ensure new MemMgr.Free is not lower
sec than LoMem
sbc MemMgr.LoMem
lda ZPMemMgrTmp2+1
sbc MemMgr.LoMem+1
bcc .98 ERR out of mem
jsr MemMgr.NextSlot
ldy #S.MEM.PTR
lda ZPMemMgrTmp2 get new MemMgr.Free
sta MemMgr.Free set as system MemMgr.Free value
sta (ZPMemMgrSPtr),y store is as base address of new slot
iny
lda ZPMemMgrTmp2+1
sta MemMgr.Free+1
sta (ZPMemMgrSPtr),y
iny
lda ZPMemMgrTmp1 get requested size
sta (ZPMemMgrSPtr),y setup slot LEN
iny
lda ZPMemMgrTmp1+1
sta (ZPMemMgrSPtr),y
stx MemMgr.LastSlot mark this slot allocated
clc
rts
.98 lda #MemMgr.ERROOM
sec
rts
.99 lda #MemMgr.ERROOH
sec
rts
*--------------------------------------
MemMgr.NextSlot lda ZPMemMgrSPtr
clc
adc #S.MEM.SIZE
sta ZPMemMgrSPtr
bcc .8
inc ZPMemMgrSPtr+1
.8 rts
*--------------------------------------
MemMgr.Init0 ldy #S.MEM.PTR
lda (ZPMemMgrSPtr),y ZPMemMgrSPtr already set
sta ZPMemMgrTmp1 set ZPMemMgrTmp1 to Mem Ptr
iny
lda (ZPMemMgrSPtr),y
sta ZPMemMgrTmp1+1
ldy #S.MEM.LEN
lda (ZPMemMgrSPtr),y
sta ZPMemMgrTmp2 set ZPMemMgrTmp2 to mem size
iny
lda (ZPMemMgrSPtr),y
sta ZPMemMgrTmp2+1
lda #0
.1 ldy ZPMemMgrTmp2
bne .2
ldy ZPMemMgrTmp2+1
beq .3
dec ZPMemMgrTmp2+1
.2 dec ZPMemMgrTmp2
sta (ZPMemMgrTmp1)
inc ZPMemMgrTmp1
bne .1
inc ZPMemMgrTmp1+1
bra .1
.3 rts
*--------------------------------------
MemMgr.SlotCnt .BS 1
MemMgr.ReqFlags .BS 1 store requested Flags
MemMgr.ReqSize .BS 2 store requested Size
*--------------------------------------
* S.FreeMemA
* In:
* A = hMem To Free
* Out:
* X,Y unmodified
*--------------------------------------
S.FreeMemA phy
phx
tax
beq .8 Slot=0, reserved by Kernel
jsr S.GetMemByIDA
lda (ZPMemMgrSPtr)
bpl * In use ?
ldy #S.MEM.REFCNT
lda (ZPMemMgrSPtr),y Get count of those referencing this hMem
dec only one left ?
sta (ZPMemMgrSPtr),y
bne .8 no, must be a code segment loaded several times
ldy #S.MEM.BIN
lda (ZPMemMgrSPtr),y Any BINPATH to discard ?
beq .1
pha save hMem
>PUSHW ZPMemMgrSPtr
pla
jsr S.GetMemByIDA
lda (ZPMemMgrSPtr)
bpl * ***MUST BE ALLOCATED***
lda #0 mark BINPATH slot as free
sta (ZPMemMgrSPtr)
>PULLW ZPMemMgrSPtr
.1 lda #0 mark this slot as free
sta (ZPMemMgrSPtr)
.2 lda MemMgr.LastSlot
beq .8
jsr S.GetMemByIDA
lda (ZPMemMgrSPtr)
bmi .8
ldy #S.MEM.LEN
lda (ZPMemMgrSPtr),y give back LEN bytes
clc
adc MemMgr.Free to MemMgr.Free
sta MemMgr.Free
iny
lda (ZPMemMgrSPtr),y
adc MemMgr.Free+1
sta MemMgr.Free+1
dec MemMgr.LastSlot discard last slot
bne .2 no slot left, exit
.8 plx
ply
clc
rts
*--------------------------------------
* S.GetMemPtrA
* In:
* A = hMem
* Out:
* Y,A = PTR to MemBlock
* X unmodified
*--------------------------------------
S.GetMemPtrA jsr S.GetMemByIDA
ldy #S.MEM.PTR
lda (ZPMemMgrSPtr),y
pha
iny
lda (ZPMemMgrSPtr),y
ply
rts
*--------------------------------------
* S.GetMemByIDA
* In:
* A = hMem
* Out:
* Y,A = ZPMemMgrSPtr = PTR to S.MEM
* X unmodified
*--------------------------------------
S.GetMemByIDA stz ZPMemMgrSPtr+1
asl
rol ZPMemMgrSPtr+1
asl
rol ZPMemMgrSPtr+1
asl
rol ZPMemMgrSPtr+1
clc
adc #MemMgr.Table
sta ZPMemMgrSPtr
tay
lda ZPMemMgrSPtr+1
adc /MemMgr.Table
sta ZPMemMgrSPtr+1
rts
*--------------------------------------
* In:
* Y,A = BINPATH (PSTR)
* Out:
* Y,A = ZPMemMgrSPtr = PTR to S.MEM
* X = hMem
*--------------------------------------
S.GetMemByNameYA
>STYA ZPMemMgrTmp1 save BINPATH
>LDYAI MemMgr.Table
>STYA ZPMemMgrTmp2
ldx #0
.1 cpx MemMgr.LastSlot
beq .9
lda (ZPMemMgrTmp2)
bpl .6 In Use?
ldy #S.MEM.BIN any BIN PATH in this slot?
lda (ZPMemMgrTmp2),y
beq .6
jsr S.GetMemPtrA get pathname
bcs *
>STYA ZPMemMgrTmp3
lda (ZPMemMgrTmp1)
cmp (ZPMemMgrTmp3)
bne .6
tay
.2 lda (ZPMemMgrTmp1),y
cmp (ZPMemMgrTmp3),y
bne .6
dey
bne .2
>LDYA ZPMemMgrTmp2
clc
rts
.6 lda ZPMemMgrTmp2
clc
adc #S.MEM.SIZE
sta ZPMemMgrTmp2
bcc .7
inc ZPMemMgrTmp2+1
.7 inx
bra .1
.9 sec
rts
*--------------------------------------
S.SetLoMem
clc
rts
*--------------------------------------
S.GarbageCollector
clc
rts
*--------------------------------------
MAN
SAVE SYS/KERNEL.S.MEM
LOAD SYS/KERNEL.S
ASM