PR#3
PREFIX /A2OSX.BUILD
LOMEM $A00
INC 1
AUTO 6
				.LIST OFF	
*--------------------------------------
* FRM.New
*  In:
*  Y,A = DataLen
*  X = S.IP.PROTOCOL.xxx
* Out:
*  Y,A = Frame PTR
*  X = hMem
*--------------------------------------
FRM.NewIP		stx	.8+1
				>STYA ZPDataOutLen
				cpx #S.IP.PROTOCOL.TCP
				bne .1
				lda #S.TCP-2
				bra .4
				
.1				cpx #S.IP.PROTOCOL.UDP
				bne .2
				lda #S.UDP-2
				bra .4
				
.2				lda #S.IP-2
				bra .4
				
.4				sta	.5+1 					save Header len for reset later
				clc
				adc ZPDataOutLen
				sta ZPFrameOutLen
				pha
				
				lda #0
				adc ZPDataOutLen+1
				sta ZPFrameOutLen+1
				tax
				
				pla
				adc #2
				tay
				txa
				adc #0
				
				>SYSCALL GetMem.YA
				bcs .9
				
				stx hFrameOut
				>STYA ZPFrameOutPtr

				lda ZPFrameOutLen
				sta (ZPFrameOutPtr)
				ldy #1
				lda ZPFrameOutLen+1
				sta (ZPFrameOutPtr),y
				
				iny
				
.5				ldx #$ff				Self Modified, header length
				
				lda #0

.6				sta (ZPFrameOutPtr),y
				iny
				dex
				bne .6
				
				tya
*				clc
				adc ZPFrameOutPtr
				sta ZPDataOutPtr
				
				lda #0
				adc ZPFrameOutPtr+1
				sta ZPDataOutPtr+1
				
				lda DevFlags
				and #S.DEVSTAT.NET.FLAGS.IPOFFLOAD
				bne .7
				
				ldy #S.ETH.ETHERTYPE
				lda /S.ETH.ETHERTYPE.IP
				sta (ZPFrameOutPtr),y		
				iny
				lda #S.ETH.ETHERTYPE.IP
				sta (ZPFrameOutPtr),y

				ldy #S.IP.V.IHL.DSCP.ECN
				lda #$45
				sta (ZPFrameOutPtr),y
				
*				iny
*				lda #$0
*				sta (ZPFrameOutPtr),y

*				ldy #S.IP.FRAGMENT.FLAGS 
*				sta (ZPFrameOutPtr),y
*				iny
*				sta (ZPFrameOutPtr),y
				
				ldy #S.IP.IDENTIFICATION+1
				
				lda IP.ID
				ldx IP.ID+1
				inc
				bne .61
				inx
				stx IP.ID+1
				
.61				sta IP.ID
				
				sta (ZPFrameOutPtr),y
				dey
				txa
				sta (ZPFrameOutPtr),y

				ldy #S.IP.TTL
				lda #K.IP.TTL
				sta (ZPFrameOutPtr),y
		
.7				ldy #S.IP.PROTOCOL

.8				lda #$ff
				sta (ZPFrameOutPtr),y
				
.9				rts
*--------------------------------------
FRM.SendIP		ldx #3					Copy SRC.IP even if IP offload
				ldy #S.IP.SRC+3			for proper UDP/TCP CRC calculation
				
.1				lda IPCFG+S.IPCFG.IP,x
				sta (ZPFrameOutPtr),y	
				dey
				dex
				bpl .1
				
				lda DevFlags
				and #S.DEVSTAT.NET.FLAGS.IPOFFLOAD
				bne .21
				
				ldy #S.IP.TOTAL.LENGTH+1
				lda ZPFrameOutLen
				sec
				sbc #S.ETH-2
				sta (ZPFrameOutPtr),y
				dey
				lda ZPFrameOutLen+1
				sbc /S.ETH-2
				sta (ZPFrameOutPtr),y
				
				lda #0
				ldy #S.IP.HDR.CHECKSUM
				sta (ZPFrameOutPtr),y
				iny
				sta (ZPFrameOutPtr),y
				
				stz IP.CHECKSUM			RESET.IP.CHECKSUM	
				stz IP.CHECKSUM+1

				clc

				ldy #S.IP.V.IHL.DSCP.ECN
				ldx #10					10 words for IP Header
				
.2				lda (ZPFrameOutPtr),y
				adc IP.CHECKSUM
				sta IP.CHECKSUM

				iny
				lda (ZPFrameOutPtr),y
				adc IP.CHECKSUM+1
				sta IP.CHECKSUM+1
				iny
				dex
				bne .2
				
				ldy #S.IP.HDR.CHECKSUM
				lda IP.CHECKSUM
				adc #0
				eor #$FF
				sta (ZPFrameOutPtr),y
				iny
				lda IP.CHECKSUM+1
				adc #0
				eor #$FF
				sta (ZPFrameOutPtr),y

.21				ldy #S.IP.PROTOCOL
				lda (ZPFrameOutPtr),y
				cmp #S.IP.PROTOCOL.TCP
				bne .3
				jsr TCP.ComputeChecksum
				bra .5
				
.3				cmp #S.IP.PROTOCOL.UDP
				bne .4
				
				lda ZPFrameOutLen
				sec
				sbc #S.IP-2
				
				ldy #S.UDP.LENGTH+1
				sta (ZPFrameOutPtr),y
				
				lda ZPFrameOutLen+1
				sbc /S.IP-2
				
				dey
				sta (ZPFrameOutPtr),y				
				
				jsr UDP.ComputeChecksum
				bra .5
				
.4				cmp #S.IP.PROTOCOL.ICMP
				bne .5
				jsr ICMP.ComputeChecksum
				
.5				lda DevFlags
				and #S.DEVSTAT.NET.FLAGS.ARPOFFLOAD
				bne .6

				jsr IP.SetDestMAC
				bcs FRM.Queue
				
.6				>LDYA ZPFrameOutPtr
				ldx #DEVMGR.WRITEBLOCK
				jsr NetDevJmp
				bcs FRM.Queue
				
				lda hFrameOut
				beq .9
				>SYSCALL FreeMem.A
				
				clc				
.9				rts
*--------------------------------------
FRM.Queue		ldy hFrameOut			no hFrame, cannot queue for retry
				beq .9

				ldx FRM.QUEUE.Head
				inx
				cpx #K.FRMQUEUE.SIZE
				bne .1
				ldx #0
.1				cpx FRM.QUEUE.Tail
				beq .9
				ldy FRM.QUEUE.Head
				stx FRM.QUEUE.Head

				sta	FRM.QUEUE.State,y
				lda #K.FRMSEND.RETRY
				sta FRM.QUEUE.Retry,y
				lda hFrameOut
				sta FRM.QUEUE.hMem,y
				clc
				rts
				
.9				sec
				rts
*--------------------------------------
FRM.Retry		ldx FRM.QUEUE.Tail

.10				cpx FRM.QUEUE.Head
				beq .8					Queue is empty, exit....
				lda FRM.QUEUE.hMem,x
				>SYSCALL GetMemPtr.A
				>STYA ZPFrameOutPtr
				
				ldx FRM.QUEUE.Tail
				lda FRM.QUEUE.State,x
				cmp #ERR.DEV+1			Device error ?
				bcc .1					yes, retry sending...
				jsr IP.SetDestMAC		Err is ARP or higher, retry getting MAC
				bcs .2					still error getting dest MAC
				
.1				>LDYA ZPFrameOutPtr		try sending again to DRV
				ldx #DEVMGR.WRITEBLOCK
				jsr NetDevJmp
				bcc .3
	
.2				ldx FRM.QUEUE.Tail		save error...
				sta FRM.QUEUE.State,x	
				dec FRM.QUEUE.Retry,x	
				bne .8					exit....until next run!
	
.3				ldx FRM.QUEUE.Tail		Success,or max retry, discard entry
				lda FRM.QUEUE.hMem,x
				>SYSCALL FreeMem.A
				
.4				ldx FRM.QUEUE.Tail
				inx
				cpx #K.FRMQUEUE.SIZE
				bne .5
				ldx #0
.5				stx FRM.QUEUE.Tail
				bra .10
				
.8				rts
*--------------------------------------
MAN
SAVE /A2OSX.SRC/LIB/LIBTCPIP.S.FRM
LOAD /A2OSX.SRC/LIB/LIBTCPIP.S
ASM