mirror of
https://github.com/A2osX/A2osX.git
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350 lines
6.3 KiB
Plaintext
350 lines
6.3 KiB
Plaintext
PR#3
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PREFIX /A2OSX.SRC
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NEW
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INC 1
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AUTO 6
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.LIST OFF
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*--------------------------------------
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ARP.CLEAR ldx #K.ARPCACHE.SIZE*S.ARPCACHE
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.1 dex
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stz ARP.CACHE,x
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txa
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bne .1
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clc
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rts
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*--------------------------------------
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* ARP.QUERY
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* In:
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* PULLW PTR to IP
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* PULLW PTR to MAC (to fill)
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* Out:
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* CC: hit: MAC filled
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* CS: missed
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*--------------------------------------
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ARP.QUERY >PULLW ZPPtrIP IP
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>PULLW ZPPtrMAC MAC
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ARP.QUERY.I jsr ARP.FIND.BY.IP
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bcs ARP.REQUEST
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lda (ZPCachePtr) get status...
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bpl .9 Pending...
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lda ZPCachePtr
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clc
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adc S.ARPCACHE.MAC
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sta ZPCachePtr
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bcc .1
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inc ZPCachePtr+1
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.1 ldy #5
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.2 lda (ZPCachePtr),y
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sta (ZPPtrMAC),y
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dey
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bpl .2
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clc
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rts
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.9 lda #ERR.ARPPENDING
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sec
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rts
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*--------------------------------------
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ARP.REQUEST ldy #3
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.1 lda (ZPPtrIP),y
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sta ARP.REQ.TPA,y
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sta ARP.TmpCache+S.ARPCACHE.IP,y
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dey
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bpl .1
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>PUSHW L.ARP.REQ
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ldx #DEVMGR.NET.SEND
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jsr NetDevJmp
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bcs .9
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lda #S.ARPCACHE.STATUS.PENDING
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jsr ARP.ADD.I ZPPtrIP still pointing IP
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lda #ERR.ARPPENDING
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sec
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.9 rts
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*--------------------------------------
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* ARP.ADD
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* In:
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* PULLW PTR to IP
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* PULLW PTR to MAC
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*--------------------------------------
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ARP.ADD >PULLW ZPPtrIP IP
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>PULLW ZPPtrMAC MAC
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lda #S.ARPCACHE.STATUS.RESOLVED+S.ARPCACHE.STATUS.STATIC
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ARP.ADD.I sta ARP.TmpCache
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jsr ARP.FIND.BY.IP
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bcc .5
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jsr DNS.FIND.FREE
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.1 lda ARP.CACHE,x get status
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beq .7 empty ARP cache entry
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phx
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ldy #0
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.2 lda (ZPPtrIP),y
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cmp ARP.CACHE+S.ARPCACHE.IP,x
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bne .4
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inx
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iny
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cpy #4
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bne .2
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plx
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bra .7 same IP,update MAC
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.4 pla get back index in ARP.CACHE
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clc
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adc #S.ARPCACHE
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cmp #K.ARPCACHE.SIZE*S.ARPCACHE
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beq .5 Cache is full ?
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tax
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bra .1
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.5 bra *
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ldx #K.ARPCACHE.SIZE*S.ARPCACHE-S.ARPCACHE
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.6 lda ARP.CACHE+S.ARPCACHE-1,x
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sta ARP.CACHE-1,x
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dex
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bne .6
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ldx #K.ARPCACHE.SIZE*S.ARPCACHE-S.ARPCACHE
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.7 lda Status
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sta ARP.CACHE,x mark ARP entry Status
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lda #K.ARP.TTL
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sta ARP.CACHE+S.ARPCACHE.TTL,x
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lda /K.ARP.TTL
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sta ARP.CACHE+S.ARPCACHE.TTL+1,x
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ldy #0
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phx
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.8 lda (ZPPtrIP),y store IP in cache
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sta ARP.CACHE+S.ARPCACHE.IP,x
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iny
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inx
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cpy #4
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bne .8
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plx
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lda Status
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bpl .82 no MAC if "pending"
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ldy #0
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.81 lda (ZPPtrMAC),y store MAC in cache
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sta ARP.CACHE+S.ARPCACHE.MAC,x
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iny
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inx
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cpy #6
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bne .81
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.82 clc
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rts
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*--------------------------------------
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* ARP.GETCACHE
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* Out:
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* Y,A = PTR to ARP.CACHE
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*--------------------------------------
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ARP.GETCACHE >LDYA L.ARP.CACHE
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clc
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rts
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*--------------------------------------
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* PRIVATE
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*--------------------------------------
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ARP.RESOLVE ldy #S.IP.DST
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lda (ZPFrameBase1),y
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iny
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.1 and (ZPFrameBase1),y
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iny
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cpy #S.IP.DST+4
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bne .1
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cmp #$FF
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bne .3 not a broadcast....
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ldy #S.ETH.DSTMAC
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.2 sta (ZPFrameBase1),y
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iny
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cpy #S.ETH.DSTMAC+6
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bne .2
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clc
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rts
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.3 ldy #S.IP.DST+3
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ldx #3
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.4 lda (ZPFrameBase1),y
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eor IPCFG+S.IPCFG.IP,x
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and IPCFG+S.IPCFG.MASK,x
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bne .5
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dey
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dex
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bpl .4
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lda ZPFrameBase1 Same network, query ARP for dest IP
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clc
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adc #S.IP.DST
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sta ZPPtrIP
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lda ZPFrameBase1+1
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adc /S.IP.DST
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sta ZPPtrIP+1
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bra .6
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.5 lda L.IPCFG Not Same network, query ARP for GW
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clc
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adc #S.IPCFG.GW
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sta ZPPtrIP
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lda L.IPCFG+1
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adc /S.IPCFG.GW
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sta ZPPtrIP+1
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.6 lda ZPFrameBase1
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clc
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adc #S.ETH.DSTMAC
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sta ZPPtrMAC
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lda ZPFrameBase1+1
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adc /S.ETH.DSTMAC
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sta ZPPtrMAC+1
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*--------------------------------------
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*--------------------------------------
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*--------------------------------------
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ARP.IN ldy #S.ARP.TPA
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ldx #S.IPCFG.IP
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.1 lda (ZPFrameBase1),y
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cmp IPCFG,x
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bne .9
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iny
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inx
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cpx #S.IPCFG.IP+4
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bne .1
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ldy #S.ARP.OPERATION+1 HI byte
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lda (ZPFrameBase1),y
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cmp #S.ARP.OPERATION.REQ
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beq ARP.IN.REQ
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cmp #S.ARP.OPERATION.REP
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beq ARP.IN.REP
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.9 clc Discard any other ARP frames
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rts
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ARP.IN.REQ ldy #S.ETH.SRCMAC+5
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ldx #5
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.1 lda (ZPFrameBase1),y
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sta ARP.REP.DSTMAC,x
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sta ARP.REP.THA,x
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dey
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dex
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bpl .1
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ldy #S.ARP.SPA+3
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ldx #3
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.2 lda (ZPFrameBase1),y
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sta ARP.REP.TPA,x
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dey
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dex
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bpl .2
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>PUSHW L.ARP.REP
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ldx #DEVMGR.NET.SEND
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jsr NetDevJmp
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ARP.IN.REP lda #S.ARP.SHA
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clc
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adc ZPFrameBase1
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sta ZPPtrMAC
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lda ZPFrameBase1+1
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adc /S.ARP.SHA
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sta ZPPtrMAC+1
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lda #S.ARP.SPA
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clc
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adc ZPFrameBase1
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sta ZPPtrIP
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lda ZPFrameBase1+1
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adc /S.ARP.SPA
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sta ZPPtrIP+1
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lda #S.ARPCACHE.STATUS.RESOLVED
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jsr ARP.ADD.I
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clc
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rts
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*--------------------------------------
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ARP.EXPIRE >LDYA L.ARP.CACHE
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>STYA ZPCachePtr
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ldx #K.ARPCACHE.SIZE
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.1 lda (ZPCachePtr)
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beq .7
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ldy #S.ARPCACHE.TTL
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sec
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lda (ZPCachePtr),y
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sbc #1
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sta (ZPCachePtr),y
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iny
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lda (ZPCachePtr),y
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sbc #0
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sta (ZPCachePtr),y
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bcs .2
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lda #0
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sta (ZPCachePtr)
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.2 lda ZPCachePtr
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clc
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adc #S.ARPCACHE
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sta ZPCachePtr
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bcc .3
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inc ZPCachePtr+1
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.3 dex
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bne .1
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rts
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*--------------------------------------
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ARP.FIND.BY.IP >LDYA L.ARP.CACHE
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>STYA ZPCachePtr
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lda #K.ARPCACHE.SIZE
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sta TmpOffset
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.1 lda (ZPCachePtr)
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beq .7
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ldy #S.ARPCACHE.IP
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lda (ZPCachePtr),y
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.7 lda ZPCachePtr
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clc
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adc #S.ARPCACHE
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sta ZPCachePtr
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bcc .8
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inc ZPCachePtr+1
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.8 dec TmpOffset
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bne .1
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sec
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rts
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*--------------------------------------
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ARP.FIND.FREE
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*--------------------------------------
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MAN
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SAVE LIB/LIBTCPIP.S.ARP
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LOAD LIB/LIBTCPIP.S
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ASM
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