u-boot/drivers/net/netconsole.c

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/*
* (C) Copyright 2004
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <command.h>
#include <stdio_dev.h>
#include <net.h>
DECLARE_GLOBAL_DATA_PTR;
static char input_buffer[512];
static int input_size = 0; /* char count in input buffer */
static int input_offset = 0; /* offset to valid chars in input buffer */
static int input_recursion = 0;
static int output_recursion = 0;
static int net_timeout;
static uchar nc_ether[6]; /* server enet address */
static IPaddr_t nc_ip; /* server ip */
static short nc_port; /* source/target port */
static const char *output_packet; /* used by first send udp */
static int output_packet_len = 0;
static void nc_wait_arp_handler (uchar * pkt, unsigned dest, unsigned src,
unsigned len)
{
NetState = NETLOOP_SUCCESS; /* got arp reply - quit net loop */
}
static void nc_handler (uchar * pkt, unsigned dest, unsigned src,
unsigned len)
{
if (input_size)
NetState = NETLOOP_SUCCESS; /* got input - quit net loop */
}
static void nc_timeout (void)
{
NetState = NETLOOP_SUCCESS;
}
void NcStart (void)
{
if (!output_packet_len || memcmp (nc_ether, NetEtherNullAddr, 6)) {
/* going to check for input packet */
NetSetHandler (nc_handler);
NetSetTimeout (net_timeout, nc_timeout);
} else {
/* send arp request */
uchar *pkt;
NetSetHandler (nc_wait_arp_handler);
pkt = (uchar *) NetTxPacket + NetEthHdrSize () + IP_HDR_SIZE;
memcpy (pkt, output_packet, output_packet_len);
NetSendUDPPacket (nc_ether, nc_ip, nc_port, nc_port, output_packet_len);
}
}
int nc_input_packet (uchar * pkt, unsigned dest, unsigned src, unsigned len)
{
int end, chunk;
if (dest != nc_port || !len)
return 0; /* not for us */
if (input_size == sizeof input_buffer)
return 1; /* no space */
if (len > sizeof input_buffer - input_size)
len = sizeof input_buffer - input_size;
end = input_offset + input_size;
if (end > sizeof input_buffer)
end -= sizeof input_buffer;
chunk = len;
if (end + len > sizeof input_buffer) {
chunk = sizeof input_buffer - end;
memcpy(input_buffer, pkt + chunk, len - chunk);
}
memcpy (input_buffer + end, pkt, chunk);
input_size += len;
return 1;
}
static void nc_send_packet (const char *buf, int len)
{
struct eth_device *eth;
int inited = 0;
uchar *pkt;
uchar *ether;
IPaddr_t ip;
if ((eth = eth_get_dev ()) == NULL) {
return;
}
if (!memcmp (nc_ether, NetEtherNullAddr, 6)) {
if (eth->state == ETH_STATE_ACTIVE)
return; /* inside net loop */
output_packet = buf;
output_packet_len = len;
NetLoop (NETCONS); /* wait for arp reply and send packet */
output_packet_len = 0;
return;
}
if (eth->state != ETH_STATE_ACTIVE) {
if (eth_init (gd->bd) < 0)
return;
inited = 1;
}
pkt = (uchar *) NetTxPacket + NetEthHdrSize () + IP_HDR_SIZE;
memcpy (pkt, buf, len);
ether = nc_ether;
ip = nc_ip;
NetSendUDPPacket (ether, ip, nc_port, nc_port, len);
if (inited)
eth_halt ();
}
static int nc_start(void)
{
int netmask, our_ip;
nc_port = 6666; /* default port */
if (getenv ("ncip")) {
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char *p;
nc_ip = getenv_IPaddr ("ncip");
if (!nc_ip)
return -1; /* ncip is 0.0.0.0 */
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if ((p = strchr (getenv ("ncip"), ':')) != NULL)
nc_port = simple_strtoul (p + 1, NULL, 10);
} else
nc_ip = ~0; /* ncip is not set */
our_ip = getenv_IPaddr ("ipaddr");
netmask = getenv_IPaddr ("netmask");
if (nc_ip == ~0 || /* 255.255.255.255 */
((netmask & our_ip) == (netmask & nc_ip) && /* on the same net */
(netmask | nc_ip) == ~0)) /* broadcast to our net */
memset (nc_ether, 0xff, sizeof nc_ether);
else
memset (nc_ether, 0, sizeof nc_ether); /* force arp request */
return 0;
}
static void nc_putc(char c)
{
if (output_recursion)
return;
output_recursion = 1;
nc_send_packet (&c, 1);
output_recursion = 0;
}
static void nc_puts(const char *s)
{
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int len;
if (output_recursion)
return;
output_recursion = 1;
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if ((len = strlen (s)) > 512)
len = 512;
nc_send_packet (s, len);
output_recursion = 0;
}
static int nc_getc(void)
{
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uchar c;
input_recursion = 1;
net_timeout = 0; /* no timeout */
while (!input_size)
NetLoop (NETCONS);
input_recursion = 0;
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c = input_buffer[input_offset++];
if (input_offset >= sizeof input_buffer)
input_offset -= sizeof input_buffer;
input_size--;
return c;
}
static int nc_tstc(void)
{
struct eth_device *eth;
if (input_recursion)
return 0;
if (input_size)
return 1;
eth = eth_get_dev ();
if (eth && eth->state == ETH_STATE_ACTIVE)
return 0; /* inside net loop */
input_recursion = 1;
net_timeout = 1;
NetLoop (NETCONS); /* kind of poll */
input_recursion = 0;
return input_size != 0;
}
int drv_nc_init (void)
{
struct stdio_dev dev;
int rc;
memset (&dev, 0, sizeof (dev));
strcpy (dev.name, "nc");
dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
dev.start = nc_start;
dev.putc = nc_putc;
dev.puts = nc_puts;
dev.getc = nc_getc;
dev.tstc = nc_tstc;
rc = stdio_register (&dev);
return (rc == 0) ? 1 : rc;
}