A2osX/LIB/LIBTCPIP.S.ARP.txt

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2017-12-22 21:24:30 +00:00
NEW
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AUTO 3,1
*/--------------------------------------
* # ARP.Clear
* Clear ARP Cache
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* **In:**
* ## RETURN VALUE
*\--------------------------------------
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ARP.Clear jsr ARP.GetCache
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ARP.Clear.I lda #0
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tay
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.2 sta (ZPCachePtr),y
iny
cpy #K.ARPCACHE.SIZE*S.ARPCACHE
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bne .2
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clc
.9 rts
*/--------------------------------------
* # ARP.Query
* Query ARP Cache and returns HW address
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* **In:**
* PUSHW PTR to MAC (to fill)
* PUSHW PTR to IP
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* ## RETURN VALUE
* CC: hit: MAC filled
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* CS: missed
*\--------------------------------------
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ARP.Query jsr ARP.GetIP
>PULLW ZPPtrMAC MAC
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jsr ARP.QUERY.I
bcs .9
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ldy #5
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.2 lda ARP.TmpCache+S.ARPCACHE.MAC,y
sta (ZPPtrMAC),y
dey
bpl .2
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* clc
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.9 rts
*/--------------------------------------
* # ARP.Add
* Add a static ARP cache record
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* **In:**
* PUSHW PTR to MAC
* PUSHW PTR to IP
*\--------------------------------------
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ARP.Add jsr ARP.GetIP
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>PULLW ZPPtrMAC MAC
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ldy #5
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.2 lda (ZPPtrMAC),y
sta ARP.TmpCache+S.ARPCACHE.MAC,y
dey
bpl .2
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stz ARP.TmpCache+S.ARPCACHE.TTL
stz ARP.TmpCache+S.ARPCACHE.TTL+1
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lda #S.ARPCACHE.S.RESOLVED+S.ARPCACHE.S.STATIC
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ARP.ADD.I sta ARP.TmpCache
jsr ARP.FIND.BY.IP
bcc .1
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jsr ARP.FIND.FREE
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.1 ldy #S.ARPCACHE-1
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.2 lda ARP.TmpCache,y
sta (ZPCachePtr),y
dey
bpl .2
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clc
rts
*/--------------------------------------
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* # ARP.GetCache
* Return a Ptr to ARP Cache Table
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* **In:**
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* ## RETURN VALUE
* Y,A = PTR to ARP.CACHE
*\--------------------------------------
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ARP.GetCache lda hARPCache
>SYSCALL2 GetMemPtr
bcs .9
>STYA ZPCachePtr
.9 rts
*--------------------------------------
* PRIVATE
*--------------------------------------
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ARP.IN ldy #S.ARP.TPA+3
ldx #3
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.1 lda (ZPFrameInPtr),y
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cmp IPCFG+S.IPCFG.IP,x
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bne ARP.IN.EXIT
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dey
dex
bpl .1
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ldy #S.ARP.OPERATION+1 HI byte
lda (ZPFrameInPtr),y
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cmp #S.ARP.OPERATION.REQ
beq ARP.IN.REQ
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cmp #S.ARP.OPERATION.REP
beq ARP.IN.REP
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ARP.IN.EXIT jmp FRM.DiscardIn
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ARP.IN.REQ ldy #S.ARP.SPA+3
ldx #3
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.1 lda (ZPFrameInPtr),y
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sta ARP.REP.TPA,x
dey
dex
bpl .1
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ldy #S.ARP.SHA+5
ldx #5
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.2 lda (ZPFrameInPtr),y
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sta ARP.REP.DSTMAC,x
sta ARP.REP.THA,x
dey
dex
bpl .2
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>LDYA L.ARP.REP
jsr ARP.Send
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bra ARP.IN.EXIT
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ARP.IN.REP lda #K.ARP.TTL
sta ARP.TmpCache+S.ARPCACHE.TTL
lda /K.ARP.TTL
sta ARP.TmpCache+S.ARPCACHE.TTL+1
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ldy #S.ARP.SPA+3
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jsr ARP.GetIPFromFrameInPtrY
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ldy #S.ARP.SHA+5
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jsr ARP.GetMacFromFrameInPtrY
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lda #S.ARPCACHE.S.RESOLVED
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jsr ARP.ADD.I
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bra ARP.IN.EXIT
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*--------------------------------------
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ARP.QUERY.I jsr ARP.FIND.BY.IP
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bcs .3 send an ARP request
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lda (ZPCachePtr) get status...
bpl .9 Pending...
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ldy #S.ARPCACHE.MAC
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.2 lda (ZPCachePtr),y
sta ARP.TmpCache,y
iny
cpy #S.ARPCACHE.MAC+6
bne .2
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ldy #S.ARPCACHE.TTL
lda #K.ARP.TTL
sta (ZPCachePtr),y
iny
lda /K.ARP.TTL
sta (ZPCachePtr),y
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clc
rts
.3 ldx #3
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.4 lda ARP.TmpCache+S.ARPCACHE.IP,x
sta ARP.REQ.TPA,x
dex
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bpl .4
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>LDYA L.ARP.REQ
jsr ARP.Send
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bcs .99
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lda #K.ARP.PENDING.TTL
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sta ARP.TmpCache+S.ARPCACHE.TTL
stz ARP.TmpCache+S.ARPCACHE.TTL+1
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lda #S.ARPCACHE.S.PENDING
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jsr ARP.ADD.I
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.9 lda #ERR.ARP.PENDING
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sec
.99 rts
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*--------------------------------------
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ARP.FIND.BY.IP jsr ARP.GetCache
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ldx #K.ARPCACHE.SIZE
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.1 lda (ZPCachePtr)
beq .3
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ldy #S.ARPCACHE.IP
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.2 lda ARP.TmpCache,y
cmp (ZPCachePtr),y
bne .3
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iny
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cpy #S.ARPCACHE.IP+4
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bne .2
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clc
rts
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.3 jsr ARP.NextCache
dex
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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 jsr ARP.GetCache
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lda #$ff
sta TmpDWord
sta TmpDWord+1
ldx #K.ARPCACHE.SIZE
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.1 lda (ZPCachePtr)
beq .8
bpl .6
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ldy #S.ARPCACHE.TTL
lda (ZPCachePtr),y
sec
sbc TmpDWord
iny
lda (ZPCachePtr),y
sbc TmpDWord+1
bcc .6
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lda (ZPCachePtr),y
sta TmpDWord+1
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dey
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lda (ZPCachePtr),y
sta TmpDWord
>LDYA ZPCachePtr
>STYA ZPTmpPtr1 save lowest TTL slot ...
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.6 jsr ARP.NextCache
dex
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bne .1
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>LDYA ZPTmpPtr1
>STYA ZPCachePtr
lda #0
sta (ZPCachePtr)
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.8 clc
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rts
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*--------------------------------------
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ARP.EXPIRE jsr ARP.GetCache
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ldx #K.ARPCACHE.SIZE
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.1 lda (ZPCachePtr)
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beq .2
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and #S.ARPCACHE.S.STATIC
bne .2
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ldy #S.ARPCACHE.TTL
sec
lda (ZPCachePtr),y
sbc #1
sta (ZPCachePtr),y
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iny
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lda (ZPCachePtr),y
sbc #0
sta (ZPCachePtr),y
bcs .2
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lda #0
sta (ZPCachePtr)
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.2 jsr ARP.NextCache
dex
bne .1
rts
*--------------------------------------
ARP.NextCache lda ZPCachePtr
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clc
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 rts
*--------------------------------------
ARP.GetIP >PULLW ZPPtrIP
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ldy #3
.1 lda (ZPPtrIP),y
sta ARP.TmpCache+S.ARPCACHE.IP,y
dey
bpl .1
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rts
*--------------------------------------
ARP.AddFromFrameInPtr
ldy #S.IP.SRC+3
jsr ARP.GetIPFromFrameInPtrY
ldy #S.ETH.SRCMAC+5
jsr ARP.GetMacFromFrameInPtrY
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lda #K.ARP.TTL
sta ARP.TmpCache+S.ARPCACHE.TTL
lda /K.ARP.TTL
sta ARP.TmpCache+S.ARPCACHE.TTL+1
lda #S.ARPCACHE.S.RESOLVED
jmp ARP.ADD.I
*--------------------------------------
ARP.GetIPFromFrameInPtrY
ldx #3
.1 lda (ZPFrameInPtr),y
sta ARP.TmpCache+S.ARPCACHE.IP,x
dey
dex
bpl .1
rts
*--------------------------------------
ARP.GetMacFromFrameInPtrY
ldx #5
.1 lda (ZPFrameInPtr),y
sta ARP.TmpCache+S.ARPCACHE.MAC,x
dey
dex
bpl .1
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rts
*--------------------------------------
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ARP.Send >STYA IOCTL+S.IOCTL.BUFPTR
>LDYAI S.ARP
>STYA IOCTL+S.IOCTL.BYTECNT
jmp FRM.Send.IOCTL
*--------------------------------------
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MAN
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SAVE usr/src/lib/libtcpip.s.arp
LOAD usr/src/lib/libtcpip.s
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ASM