100 lines
2.5 KiB
ArmAsm
100 lines
2.5 KiB
ArmAsm
; Common ethernet driver code (independant of host computer or ethernet chipset)
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.include "../inc/common.inc"
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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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.exportzp eth_dest
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.exportzp eth_src
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.exportzp eth_type
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.exportzp eth_data
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.export eth_outp
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.export eth_outp_len
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.export eth_inp
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.export eth_inp_len
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.import cfg_mac
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.bss
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; input and output buffers
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eth_inp_len: .res 2 ; input packet length
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eth_inp: .res 1518 ; space for input packet
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eth_outp_len: .res 2 ; output packet length
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eth_outp: .res 1518 ; space for output packet
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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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; -- LICENSE FOR eth.s --
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; The contents of this file are subject to the Mozilla Public License
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; Version 1.1 (the "License"); you may not use this file except in
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; compliance with the License. You may obtain a copy of the License at
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; http://www.mozilla.org/MPL/
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;
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; Software distributed under the License is distributed on an "AS IS"
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; basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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; License for the specific language governing rights and limitations
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; under the License.
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;
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; The Original Code is ip65.
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;
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; The Initial Developer of the Original Code is Per Olofsson,
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; MagerValp@gmail.com.
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; Portions created by the Initial Developer are Copyright (C) 2009
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; Per Olofsson. All Rights Reserved.
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; -- LICENSE END --
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