drivers/net/netconsole.c

   1 /*
   2  * (C) Copyright 2004
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25 #include <command.h>
  26 #include <stdio_dev.h>
  27 #include <net.h>
  28
  29 DECLARE_GLOBAL_DATA_PTR;
  30
  31 static char input_buffer[512];
  32 static int input_size = 0;              /* char count in input buffer */
  33 static int input_offset = 0;            /* offset to valid chars in input buffer */
  34 static int input_recursion = 0;
  35 static int output_recursion = 0;
  36 static int net_timeout;
  37 static uchar nc_ether[6];               /* server enet address */
  38 static IPaddr_t nc_ip;                  /* server ip */
  39 static short nc_port;                   /* source/target port */
  40 static const char *output_packet;       /* used by first send udp */
  41 static int output_packet_len = 0;
  42
  43 static void nc_wait_arp_handler (uchar * pkt, unsigned dest, unsigned src,
  44                                  unsigned len)
  45 {
  46         NetState = NETLOOP_SUCCESS;     /* got arp reply - quit net loop */
  47 }
  48
  49 static void nc_handler (uchar * pkt, unsigned dest, unsigned src,
  50                         unsigned len)
  51 {
  52         if (input_size)
  53                 NetState = NETLOOP_SUCCESS;     /* got input - quit net loop */
  54 }
  55
  56 static void nc_timeout (void)
  57 {
  58         NetState = NETLOOP_SUCCESS;
  59 }
  60
  61 void NcStart (void)
  62 {
  63         if (!output_packet_len || memcmp (nc_ether, NetEtherNullAddr, 6)) {
  64                 /* going to check for input packet */
  65                 NetSetHandler (nc_handler);
  66                 NetSetTimeout (net_timeout, nc_timeout);
  67         } else {
  68                 /* send arp request */
  69                 uchar *pkt;
  70                 NetSetHandler (nc_wait_arp_handler);
  71                 pkt = (uchar *) NetTxPacket + NetEthHdrSize () + IP_HDR_SIZE;
  72                 memcpy (pkt, output_packet, output_packet_len);
  73                 NetSendUDPPacket (nc_ether, nc_ip, nc_port, nc_port, output_packet_len);
  74         }
  75 }
  76
  77 int nc_input_packet (uchar * pkt, unsigned dest, unsigned src, unsigned len)
  78 {
  79         int end, chunk;
  80
  81         if (dest != nc_port || !len)
  82                 return 0;               /* not for us */
  83
  84         if (input_size == sizeof input_buffer)
  85                 return 1;               /* no space */
  86         if (len > sizeof input_buffer - input_size)
  87                 len = sizeof input_buffer - input_size;
  88
  89         end = input_offset + input_size;
  90         if (end > sizeof input_buffer)
  91                 end -= sizeof input_buffer;
  92
  93         chunk = len;
  94         if (end + len > sizeof input_buffer) {
  95                 chunk = sizeof input_buffer - end;
  96                 memcpy(input_buffer, pkt + chunk, len - chunk);
  97         }
  98         memcpy (input_buffer + end, pkt, chunk);
  99
 100         input_size += len;
 101
 102         return 1;
 103 }
 104
 105 static void nc_send_packet (const char *buf, int len)
 106 {
 107         struct eth_device *eth;
 108         int inited = 0;
 109         uchar *pkt;
 110         uchar *ether;
 111         IPaddr_t ip;
 112
 113         if ((eth = eth_get_dev ()) == NULL) {
 114                 return;
 115         }
 116
 117         if (!memcmp (nc_ether, NetEtherNullAddr, 6)) {
 118                 if (eth->state == ETH_STATE_ACTIVE)
 119                         return; /* inside net loop */
 120                 output_packet = buf;
 121                 output_packet_len = len;
 122                 NetLoop (NETCONS);      /* wait for arp reply and send packet */
 123                 output_packet_len = 0;
 124                 return;
 125         }
 126
 127         if (eth->state != ETH_STATE_ACTIVE) {
 128                 if (eth_init (gd->bd) < 0)
 129                         return;
 130                 inited = 1;
 131         }
 132         pkt = (uchar *) NetTxPacket + NetEthHdrSize () + IP_HDR_SIZE;
 133         memcpy (pkt, buf, len);
 134         ether = nc_ether;
 135         ip = nc_ip;
 136         NetSendUDPPacket (ether, ip, nc_port, nc_port, len);
 137
 138         if (inited)
 139                 eth_halt ();
 140 }
 141
 142 int nc_start (void)
 143 {
 144         int netmask, our_ip;
 145
 146         nc_port = 6666;         /* default port */
 147
 148         if (getenv ("ncip")) {
 149                 char *p;
 150
 151                 nc_ip = getenv_IPaddr ("ncip");
 152                 if (!nc_ip)
 153                         return -1;      /* ncip is 0.0.0.0 */
 154                 if ((p = strchr (getenv ("ncip"), ':')) != NULL)
 155                         nc_port = simple_strtoul (p + 1, NULL, 10);
 156         } else
 157                 nc_ip = ~0;             /* ncip is not set */
 158
 159         our_ip = getenv_IPaddr ("ipaddr");
 160         netmask = getenv_IPaddr ("netmask");
 161
 162         if (nc_ip == ~0 ||                              /* 255.255.255.255 */
 163             ((netmask & our_ip) == (netmask & nc_ip) && /* on the same net */
 164             (netmask | nc_ip) == ~0))                   /* broadcast to our net */
 165                 memset (nc_ether, 0xff, sizeof nc_ether);
 166         else
 167                 memset (nc_ether, 0, sizeof nc_ether);  /* force arp request */
 168
 169         return 0;
 170 }
 171
 172 void nc_putc (char c)
 173 {
 174         if (output_recursion)
 175                 return;
 176         output_recursion = 1;
 177
 178         nc_send_packet (&c, 1);
 179
 180         output_recursion = 0;
 181 }
 182
 183 void nc_puts (const char *s)
 184 {
 185         int len;
 186
 187         if (output_recursion)
 188                 return;
 189         output_recursion = 1;
 190
 191         if ((len = strlen (s)) > 512)
 192                 len = 512;
 193
 194         nc_send_packet (s, len);
 195
 196         output_recursion = 0;
 197 }
 198
 199 int nc_getc (void)
 200 {
 201         uchar c;
 202
 203         input_recursion = 1;
 204
 205         net_timeout = 0;        /* no timeout */
 206         while (!input_size)
 207                 NetLoop (NETCONS);
 208
 209         input_recursion = 0;
 210
 211         c = input_buffer[input_offset++];
 212
 213         if (input_offset >= sizeof input_buffer)
 214                 input_offset -= sizeof input_buffer;
 215         input_size--;
 216
 217         return c;
 218 }
 219
 220 int nc_tstc (void)
 221 {
 222         struct eth_device *eth;
 223
 224         if (input_recursion)
 225                 return 0;
 226
 227         if (input_size)
 228                 return 1;
 229
 230         eth = eth_get_dev ();
 231         if (eth && eth->state == ETH_STATE_ACTIVE)
 232                 return 0;       /* inside net loop */
 233
 234         input_recursion = 1;
 235
 236         net_timeout = 1;
 237         NetLoop (NETCONS);      /* kind of poll */
 238
 239         input_recursion = 0;
 240
 241         return input_size != 0;
 242 }
 243
 244 int drv_nc_init (void)
 245 {
 246         struct stdio_dev dev;
 247         int rc;
 248
 249         memset (&dev, 0, sizeof (dev));
 250
 251         strcpy (dev.name, "nc");
 252         dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM;
 253         dev.start = nc_start;
 254         dev.putc = nc_putc;
 255         dev.puts = nc_puts;
 256         dev.getc = nc_getc;
 257         dev.tstc = nc_tstc;
 258
 259         rc = stdio_register (&dev);
 260
 261         return (rc == 0) ? 1 : rc;
 262 }