M7350/bootable/bootloader/lk/platform/armemu/net.c
2024-09-09 08:52:07 +00:00

399 lines
11 KiB
C

#if WITH_LWIP
/*
* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* This file is part of the lwIP TCP/IP stack.
*
* Author: Adam Dunkels <adam@sics.se>
*
*/
/*
* This file is a skeleton for developing Ethernet network interface
* drivers for lwIP. Add code to the low_level functions and do a
* search-and-replace for the word "ethernetif" to replace it with
* something that better describes your network interface.
*/
/*
* ARMEMU bits
* Copyright (c) 2006 Travis Geiselbrecht
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <malloc.h>
#include <dev/ethernet.h>
#include <err.h>
#include <reg.h>
#include <string.h>
#include <platform/interrupts.h>
#include <platform/armemu/memmap.h>
#include "lwip/opt.h"
#include "lwip/def.h"
#include "lwip/mem.h"
#include "lwip/pbuf.h"
#include "lwip/sys.h"
#include <lwip/stats.h>
#include "netif/etharp.h"
/* Define those to better describe your network interface. */
#define IFNAME0 'e'
#define IFNAME1 'n'
struct ethernetif {
struct eth_addr *ethaddr;
/* Add whatever per-interface state that is needed here. */
};
static const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}};
/* Forward declarations. */
static void ethernetif_input(struct netif *netif);
static err_t ethernetif_output(struct netif *netif, struct pbuf *p,
struct ip_addr *ipaddr);
static void
low_level_init(struct netif *netif)
{
struct ethernetif *ethernetif = netif->state;
/* set MAC hardware address length */
netif->hwaddr_len = 6;
/* set MAC hardware address */
netif->hwaddr[0] = 0;
netif->hwaddr[1] = 0x01;
netif->hwaddr[2] = 0x02;
netif->hwaddr[3] = 0x03;
netif->hwaddr[4] = 0x04;
netif->hwaddr[5] = 0x05;
/* maximum transfer unit */
netif->mtu = 1500;
/* broadcast capability */
netif->flags = NETIF_FLAG_BROADCAST;
/* Do whatever else is needed to initialize interface. */
}
/*
* low_level_output():
*
* Should do the actual transmission of the packet. The packet is
* contained in the pbuf that is passed to the function. This pbuf
* might be chained.
*
*/
static err_t
low_level_output(struct netif *netif, struct pbuf *p)
{
struct ethernetif *ethernetif = netif->state;
struct pbuf *q;
int i;
int j;
#if ETH_PAD_SIZE
pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
#endif
/* XXX maybe just a mutex? */
enter_critical_section();
i = 0;
for(q = p; q != NULL; q = q->next) {
/* Send the data from the pbuf to the interface, one pbuf at a
time. The size of the data in each pbuf is kept in the ->len
variable. */
// debug_dump_memory_bytes(q->payload, q->len);
for (j = 0; j < q->len; j++)
*REG8(NET_OUT_BUF + i + j) = ((unsigned char *)q->payload)[j];
i += q->len;
}
*REG(NET_SEND_LEN) = i;
*REG(NET_SEND) = 1;
exit_critical_section();
#if ETH_PAD_SIZE
pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
#endif
#if LINK_STATS
lwip_stats.link.xmit++;
#endif /* LINK_STATS */
return ERR_OK;
}
/*
* low_level_input():
*
* Should allocate a pbuf and transfer the bytes of the incoming
* packet from the interface into the pbuf.
*
*/
static struct pbuf *
low_level_input(struct netif *netif)
{
struct ethernetif *ethernetif = netif->state;
struct pbuf *p, *q;
u16_t len;
int i;
int head, tail;
/* get the head and tail pointers from the ethernet interface */
head = *REG(NET_HEAD);
tail = *REG(NET_TAIL);
if (tail == head)
return NULL; // false alarm
/* Obtain the size of the packet and put it into the "len"
variable. */
len = *REG(NET_IN_BUF_LEN);
#if ETH_PAD_SIZE
len += ETH_PAD_SIZE; /* allow room for Ethernet padding */
#endif
/* We allocate a pbuf chain of pbufs from the pool. */
p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
if (p != NULL) {
#if ETH_PAD_SIZE
pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
#endif
/* We iterate over the pbuf chain until we have read the entire
* packet into the pbuf. */
int pos = 0;
for(q = p; q != NULL; q = q->next) {
/* Read enough bytes to fill this pbuf in the chain. The
* available data in the pbuf is given by the q->len
* variable. */
for (i=0; i < q->len; i++) {
((unsigned char *)q->payload)[i] = *REG8(NET_IN_BUF + pos);
pos++;
}
}
#if ETH_PAD_SIZE
pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
#endif
#if LINK_STATS
lwip_stats.link.recv++;
#endif /* LINK_STATS */
} else {
#if LINK_STATS
lwip_stats.link.memerr++;
lwip_stats.link.drop++;
#endif /* LINK_STATS */
}
/* push the tail pointer up by one, giving the buffer back to the hardware */
*REG(NET_TAIL) = (tail + 1) % NET_IN_BUF_COUNT;
return p;
}
/*
* ethernetif_output():
*
* This function is called by the TCP/IP stack when an IP packet
* should be sent. It calls the function called low_level_output() to
* do the actual transmission of the packet.
*
*/
static err_t
ethernetif_output(struct netif *netif, struct pbuf *p,
struct ip_addr *ipaddr)
{
// dprintf("ethernetif_output: netif %p, pbuf %p, ipaddr %p\n", netif, p, ipaddr);
/* resolve hardware address, then send (or queue) packet */
return etharp_output(netif, ipaddr, p);
}
/*
* ethernetif_input():
*
* This function should be called when a packet is ready to be read
* from the interface. It uses the function low_level_input() that
* should handle the actual reception of bytes from the network
* interface.
*
*/
static void
ethernetif_input(struct netif *netif)
{
struct ethernetif *ethernetif;
struct eth_hdr *ethhdr;
struct pbuf *p;
ethernetif = netif->state;
/* move received packet into a new pbuf */
p = low_level_input(netif);
/* no packet could be read, silently ignore this */
if (p == NULL) return;
/* points to packet payload, which starts with an Ethernet header */
ethhdr = p->payload;
#if LINK_STATS
lwip_stats.link.recv++;
#endif /* LINK_STATS */
ethhdr = p->payload;
// dprintf("ethernetif_input: type 0x%x\n", htons(ethhdr->type));
switch (htons(ethhdr->type)) {
/* IP packet? */
case ETHTYPE_IP:
/* update ARP table */
etharp_ip_input(netif, p);
/* skip Ethernet header */
pbuf_header(p, -sizeof(struct eth_hdr));
/* pass to network layer */
netif->input(p, netif);
break;
case ETHTYPE_ARP:
/* pass p to ARP module */
etharp_arp_input(netif, ethernetif->ethaddr, p);
break;
default:
pbuf_free(p);
p = NULL;
break;
}
}
static enum handler_return ethernet_int(void *arg)
{
struct netif *netif = (struct netif *)arg;
ethernetif_input(netif);
return INT_RESCHEDULE;
}
/*
* ethernetif_init():
*
* Should be called at the beginning of the program to set up the
* network interface. It calls the function low_level_init() to do the
* actual setup of the hardware.
*
*/
static err_t
ethernetif_init(struct netif *netif)
{
struct ethernetif *ethernetif;
ethernetif = mem_malloc(sizeof(struct ethernetif));
if (ethernetif == NULL)
{
LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_init: out of memory\n"));
return ERR_MEM;
}
netif->state = ethernetif;
netif->name[0] = IFNAME0;
netif->name[1] = IFNAME1;
netif->output = ethernetif_output;
netif->linkoutput = low_level_output;
ethernetif->ethaddr = (struct eth_addr *)&(netif->hwaddr[0]);
low_level_init(netif);
return ERR_OK;
}
status_t ethernet_init(void)
{
/* check to see if the ethernet feature is turned on */
if ((*REG(SYSINFO_FEATURES) & SYSINFO_FEATURE_NETWORK) == 0)
return ERR_NOT_FOUND;
struct netif *netif = calloc(sizeof(struct netif), 1);
struct ip_addr *ipaddr = calloc(sizeof(struct ip_addr), 1);
struct ip_addr *netmask = calloc(sizeof(struct ip_addr), 1);
struct ip_addr *gw = calloc(sizeof(struct ip_addr), 1);
struct netif *netifret = netif_add(netif, ipaddr, netmask, gw, NULL, &ethernetif_init, &ip_input);
if (netifret == NULL) {
free(netif);
free(ipaddr);
free(netmask);
free(gw);
return ERR_NOT_FOUND;
}
/* register for interrupt handlers */
register_int_handler(INT_NET, ethernet_int, netif);
netif_set_default(netif);
unmask_interrupt(INT_NET, NULL);
return NO_ERROR;
}
#endif // WITH_LWIP