diff options
Diffstat (limited to 'drivers/net/netconsole.c')
| -rw-r--r-- | drivers/net/netconsole.c | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c new file mode 100644 index 0000000..69089f9 --- /dev/null +++ b/drivers/net/netconsole.c @@ -0,0 +1,267 @@ +/* + * (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> + +#ifdef CONFIG_NETCONSOLE + +#include <command.h> +#include <devices.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 (); +} + +int nc_start (void) +{ + int netmask, our_ip; + + nc_port = 6666; /* default port */ + + if (getenv ("ncip")) { + char *p; + + nc_ip = getenv_IPaddr ("ncip"); + if (!nc_ip) + return -1; /* ncip is 0.0.0.0 */ + 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; +} + +void nc_putc (char c) +{ + if (output_recursion) + return; + output_recursion = 1; + + nc_send_packet (&c, 1); + + output_recursion = 0; +} + +void nc_puts (const char *s) +{ + int len; + + if (output_recursion) + return; + output_recursion = 1; + + if ((len = strlen (s)) > 512) + len = 512; + + nc_send_packet (s, len); + + output_recursion = 0; +} + +int nc_getc (void) +{ + uchar c; + + input_recursion = 1; + + net_timeout = 0; /* no timeout */ + while (!input_size) + NetLoop (NETCONS); + + input_recursion = 0; + + c = input_buffer[input_offset++]; + + if (input_offset >= sizeof input_buffer) + input_offset -= sizeof input_buffer; + input_size--; + + return c; +} + +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) +{ + device_t 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 = device_register (&dev); + + return (rc == 0) ? 1 : rc; +} + +#endif /* CONFIG_NETCONSOLE */ |