PR#3
PREFIX /A2OSX.SRC
LOMEM $A00
INC 1
AUTO 6
				.LIST OFF	
*/--------------------------------------
* #FRM.NewA
* ##In:
*  A = S.IP.PROTOCOL.???
* ##Out:
*	Y,A = Frame PTR
*	X = hMem
*\--------------------------------------
FRM.NewA		sta	.1+1
				>PUSHWI K.ETH.FRAME.LEN
				>PUSHBI S.MEM.F.INIT0
				>SYSCALL GetMem
				bcs .9
				>STYA ZPFrameBase

				ldy #S.IP.PROTOCOL
.1				lda #$ff
				sta (ZPFrameBase),y
				
				lda DevFlags
				and #S.DEVSTAT.NET.FLAGS.IPOFFLOAD
				bne .9
				
				ldy #S.ETH.ETHERTYPE
				lda /S.ETH.ETHERTYPE.IP
				sta (ZPFrameBase),y		
				iny
				lda #S.ETH.ETHERTYPE.IP
				sta (ZPFrameBase),y

				ldy #S.IP.V.IHL.DSCP.ECN
				lda #$45
				sta (ZPFrameBase),y
				iny
				lda #$0
				sta (ZPFrameBase),y
				
				ldy #S.IP.IDENTIFICATION
				sta (ZPFrameBase),y
				inc
				iny
				sta (ZPFrameBase),y
				dec
				ldy #S.IP.FRAGMENT.FLAGS 
				sta (ZPFrameBase),y
				iny
				sta (ZPFrameBase),y

				ldy #S.IP.TTL
				lda #K.IP.TTL
				sta (ZPFrameBase),y
				>LDYA ZPFrameBase
.9				rts
*--------------------------------------
FRM.SendICMP	>PUSHW ZPFrameLen
				>PUSHWI S.ICMP.TYPE-2

				ldy #S.ICMP.CHECKSUM
				lda #0
				sta (ZPFrameBase),y
				iny
				sta (ZPFrameBase),y

				jsr IP.ComputeChecksum

				phy
				ldy #S.ICMP.CHECKSUM
				sta (ZPFrameBase),y
				iny
				pla
				sta (ZPFrameBase),y
				
				bra FRM.SendIP
*--------------------------------------
FRM.SendTCP

				bra FRM.SendIP
*--------------------------------------
FRM.SendUDP		ldy #S.UDP.LENGTH+1
				lda ZPFrameLen
				sec
				sbc #S.IP-2
				sta (ZPFrameBase),y
				dey
				lda ZPFrameLen+1
				sbc /S.IP-2
				sta (ZPFrameBase),y
*--------------------------------------
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 (ZPFrameBase),y	
				dey
				dex
				bpl .1
				
				lda DevFlags
				and #S.DEVSTAT.NET.FLAGS.IPOFFLOAD
				bne .21
				
				ldy #S.IP.TOTAL.LENGTH+1
				lda ZPFrameLen
				sec
				sbc #S.ETH-2
				sta (ZPFrameBase),y
				dey
				lda ZPFrameLen+1
				sbc /S.ETH-2
				sta (ZPFrameBase),y
				
				lda #0
				ldy #S.IP.HDR.CHECKSUM
				sta (ZPFrameBase),y
				iny
				sta (ZPFrameBase),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 (ZPFrameBase),y
				adc IP.CHECKSUM
				sta IP.CHECKSUM

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

.21				ldy #S.IP.PROTOCOL
				lda (ZPFrameBase),y
				cmp #S.IP.PROTOCOL.TCP
				bne .3
				jsr TCP.ComputeChecksum
				bra .4
				
.3				cmp #S.IP.PROTOCOL.UDP
				bne .4
				jsr UDP.ComputeChecksum
				
.4				lda DevFlags
				and #S.DEVSTAT.NET.FLAGS.ARPOFFLOAD
				bne .5

				jsr IP.SetDestMAC
				bcs FRM.Queue
				
.5				>LDYA ZPFrameBase
				ldx #DEVMGR.WRITEBLOCK
				jsr NetDevJmp
				bcs FRM.Queue
				lda hFrameOut
				beq .9
				>SYSCALL FreeMemA
				
				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 GetMemPtrA
				>STYA ZPFrameBase
				
				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 ZPFrameBase		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 FreeMemA
				
.4				ldx FRM.QUEUE.Tail
				inx
				cpx #K.FRMQUEUE.SIZE
				bne .5
				ldx #0
.5				stx FRM.QUEUE.Tail
				bra .10
				
.8				rts
*--------------------------------------
FRM.GetLen		lda (ZPFrameBase)		Get Frame Len
				sta ZPFrameLen
				ldy #1
				lda (ZPFrameBase),y
				sta ZPFrameLen+1
				rts
*--------------------------------------
MAN
SAVE LIB/LIBTCPIP.S.FRM
LOAD LIB/LIBTCPIP.S
ASM