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139 lines
3.6 KiB
ArmAsm
139 lines
3.6 KiB
ArmAsm
; ip65 main routines
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.include "../inc/common.inc"
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.include "../inc/error.inc"
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.export ip65_init
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.export ip65_process
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.export ip65_random_word
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.export ip65_ctr
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.export ip65_ctr_arp
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.export ip65_ctr_ip
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.export ip65_error
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.import eth_init
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.import timer_init
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.import arp_init
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.import ip_init
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.import timer_read
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.import eth_inp
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.import eth_outp
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.import eth_rx
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.import ip_process
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.import arp_process
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.importzp eth_proto_arp
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.bss
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ip65_ctr: .res 1 ; incremented for every incoming packet
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ip65_ctr_arp: .res 1 ; incremented for every incoming arp packet
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ip65_ctr_ip: .res 1 ; incremented for every incoming ip packet
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ip65_error: .res 1 ; last error code
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.code
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; generate a 'random' 16 bit word
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; entropy comes from the last ethernet frame, counters, and timer
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; inputs: none
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; outputs: AX set to a pseudo-random 16 bit number
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ip65_random_word:
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jsr timer_read ;sets AX
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adc $4e ; on an Apple 2, this is RNDL
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adc $9004 ; on a VIC 20, this is the raster register
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adc $d41b ; on a C64, this is a 'random' number from the SID
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pha
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adc ip65_ctr_arp
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ora #$08 ; make sure we grab at least 8 bytes from eth_inp
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tax
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: adc eth_inp,x
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adc eth_outp,x
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dex
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bne :-
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tax
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pla
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adc ip65_ctr
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eor ip65_ctr_ip
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rts
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; initialise the IP stack
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; this calls the individual protocol & driver initialisations, so this is
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; the only *_init routine that must be called by a user application,
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; except for dhcp_init which must also be called if the application
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; is using dhcp rather than hardcoded ip configuration
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; inputs: none
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; outputs: carry flag is set if there was an error, clear otherwise
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ip65_init:
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jsr eth_init ; initialize ethernet driver
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bcc @ok
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lda #IP65_ERROR_DEVICE_FAILURE
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sta ip65_error
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rts
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@ok:
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jsr timer_init ; initialize timer
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jsr arp_init ; initialize arp
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jsr ip_init ; initialize ip, icmp, udp, and tcp
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clc
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rts
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; main ip polling loop
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; this routine should be periodically called by an application at any time
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; that an inbound packet needs to be handled.
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; it is 'non-blocking', i.e. it will return if there is no packet waiting to be
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; handled. any inbound packet will be handed off to the appropriate handler.
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; inputs: none
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; outputs: carry flag set if no packet was waiting, or packet handling caused error.
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; since the inbound packet may trigger generation of an outbound, eth_outp
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; and eth_outp_len may be overwriiten.
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ip65_process:
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jsr eth_rx ; check for incoming packets
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bcs @done
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lda eth_inp + 12 ; type should be 08xx
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cmp #8
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bne @done
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lda eth_inp + 13
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; cmp #eth_proto_ip ; ip = 00
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beq @ip
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cmp #eth_proto_arp ; arp = 06
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beq @arp
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@done:
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rts
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@arp:
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inc ip65_ctr_arp
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jmp arp_process
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@ip:
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inc ip65_ctr_ip
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jmp ip_process
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; -- LICENSE FOR ip65.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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