Add support for console over UDP (compatible to Ingo Molnar's

netconsole patch under Linux)

1 files changed, 204 insertions, 0 deletions

diff --git a/drivers/netconsole.c b/drivers/netconsole.c
new file mode 100644
index 000000000..7e1916132
--- /dev/null
+++ b/drivers/netconsole.c
@@ -0,0 +1,204 @@
+/*
+ * (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>
+
+#ifndef CONFIG_NET_MULTI
+#error define CONFIG_NET_MULTI to use netconsole
+#endif
+
+static uchar nc_buf = 0;	/* input buffer */
+static int input_recursion = 0;
+static int output_recursion = 0;
+static int net_timeout;
+
+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 (nc_buf)
+		NetState = NETLOOP_SUCCESS;	/* got input - quit net loop */
+}
+
+static void nc_timeout (void)
+{
+	NetState = NETLOOP_SUCCESS;
+}
+
+void NcStart (void)
+{
+	if (memcmp (NetServerEther, NetEtherNullAddr, 6)) {
+		/* going to check for input packet */
+		NetSetHandler (nc_handler);
+		NetSetTimeout (net_timeout, nc_timeout);
+	} else {
+		/* send arp request */
+		NetSetHandler (nc_wait_arp_handler);
+		NetSendUDPPacket (NetServerEther, NetServerIP, 6665, 6666, 0);
+	}
+}
+
+int nc_input_packet (uchar * pkt, unsigned dest, unsigned src, unsigned len)
+{
+	if (dest != 6666 || !len)
+		return 0;		/* not for us */
+
+	nc_buf = *pkt;
+	return 1;
+}
+
+static void nc_send_packet (const char *buf, int len)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	struct eth_device *eth;
+	int inited = 0;
+	uchar *pkt;
+
+	if (!memcmp (NetServerEther, NetEtherNullAddr, 6))
+		return;
+
+	if ((eth = eth_get_dev ()) == NULL) {
+		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);
+	NetSendUDPPacket (NetServerEther, NetServerIP, 6666, 6665, len);
+
+	if (inited)
+		eth_halt ();
+}
+
+int nc_start (void)
+{
+	if (memcmp (NetServerEther, NetEtherNullAddr, 6))
+		return 0;
+
+	return NetLoop (NETCONS);	/* wait for arp reply */
+}
+
+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)
+{
+	if (output_recursion)
+		return;
+	output_recursion = 1;
+
+	int len = strlen (s);
+
+	if (len > 512)
+		len = 512;
+
+	nc_send_packet (s, len);
+
+	output_recursion = 0;
+}
+
+int nc_getc (void)
+{
+	input_recursion = 1;
+
+	net_timeout = 0;	/* no timeout */
+	while (!nc_buf)
+		NetLoop (NETCONS);
+
+	input_recursion = 0;
+
+	uchar tmp = nc_buf;
+
+	nc_buf = 0;
+	return tmp;
+}
+
+int nc_tstc (void)
+{
+	struct eth_device *eth;
+
+	if (input_recursion)
+		return 0;
+
+	if (nc_buf)
+		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 nc_buf != 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 */