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64 lines
1.4 KiB
ArmAsm
64 lines
1.4 KiB
ArmAsm
; Common ethernet driver code (independant of host computer or ethernet chipset)
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.include "../inc/common.i"
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.export eth_set_broadcast_dest
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.export eth_set_my_mac_src
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.export eth_set_proto
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.exportzp eth_proto_ip
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.exportzp eth_proto_arp
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.import eth_outp
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.import cfg_mac
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; ethernet packet offsets
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eth_dest = 0 ; offset of destination address in ethernet packet
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eth_src = 6 ; offset of source address in ethernet packet
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eth_type = 12 ; offset of packet type in ethernet packet
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eth_data = 14 ; offset of packet data in ethernet packet
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; protocols
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eth_proto_ip = 0
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eth_proto_arp = 6
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.code
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;set the destination address in the packet under construction to be the ethernet
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;broadcast address (FF:FF:FF:FF:FF:FF)
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;inputs:
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; eth_outp: buffer in which outbound ethernet packet is being constructed
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;outputs: none
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eth_set_broadcast_dest:
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ldx #5
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lda #$ff
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: sta eth_outp,x
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dex
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bpl :-
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rts
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;set the source address in the packet under construction to be local mac address
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;inputs:
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; eth_outp: buffer in which outbound ethernet packet is being constructed
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;outputs: none
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eth_set_my_mac_src:
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ldx #5
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: lda cfg_mac,x
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sta eth_outp + 6,x
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dex
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bpl :-
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rts
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;set the 'protocol' field in the packet under construction
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;inputs:
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; A = protocol number (per 'eth_proto_*' constants)
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;outputs: none
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eth_set_proto:
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sta eth_outp + eth_type + 1
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lda #8
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sta eth_outp + eth_type
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rts
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