A2osX/LIB/LIBTCPIP.S.ARP.txt
2021-05-19 14:44:47 +02:00

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