* Add support for log buffer which can be passed to Linux kernel's

  syslog mechanism; used especially for POST results.

* Patch by Klaus Heydeck, 31 Oct 2002:
  Add initial support for kup4k board

1 files changed, 223 insertions, 0 deletions

diff --git a/common/cmd_log.c b/common/cmd_log.c
new file mode 100644
index 0000000000..2e42f10338
--- /dev/null
+++ b/common/cmd_log.c
@@ -0,0 +1,223 @@
+/*
+ * (C) Copyright 2002
+ * Detlev Zundel, DENX Software Engineering, dzu@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
+ */
+
+/*
+ * Logbuffer handling routines
+ */
+
+#include <common.h>
+#include <command.h>
+#include <devices.h>
+#include <logbuff.h>
+
+#if defined(CONFIG_LOGBUFFER)
+
+#define LOG_BUF_LEN	(16384)
+#define LOG_BUF_MASK	(LOG_BUF_LEN-1)
+
+/* Local prototypes */
+static void logbuff_putc (const char c);
+static void logbuff_puts (const char *s);
+static int logbuff_printk(const char *line);
+
+static char buf[1024];
+
+static unsigned console_loglevel = 3;
+static unsigned default_message_loglevel = 4;
+static unsigned long log_size;
+static unsigned char *log_buf=NULL;
+static unsigned long *ext_log_start, *ext_logged_chars;
+#define log_start (*ext_log_start)
+#define logged_chars (*ext_logged_chars)
+
+/* Forced by code, eh! */
+#define LOGBUFF_MAGIC 0xc0de4ced
+
+int drv_logbuff_init (void)
+{
+	device_t logdev;
+	int rc;
+
+	/* Device initialization */
+	memset (&logdev, 0, sizeof (logdev));
+
+	strcpy (logdev.name, "logbuff");
+	logdev.ext   = 0;			/* No extensions */
+	logdev.flags = DEV_FLAGS_OUTPUT;	/* Output only */
+	logdev.putc  = logbuff_putc;		/* 'putc' function */
+	logdev.puts  = logbuff_puts;		/* 'puts' function */
+
+	rc = device_register (&logdev);
+
+	return (rc == 0) ? 1 : rc;
+}
+
+static void logbuff_putc (const char c)
+{
+	char buf[2];
+	buf[0]=c;
+	buf[1]='\0';
+	logbuff_printk(buf);
+}
+
+static void logbuff_puts (const char *s)
+{
+	char buf[512];
+
+	sprintf(buf, "%s\n", s);
+	logbuff_printk(buf);
+}
+
+void logbuff_log(char *msg)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	if (gd->flags & GD_FLG_RELOC) {
+		logbuff_printk(msg);
+	} else {
+		puts(msg);
+	}
+}
+
+void logbuff_reset (void)
+{
+	char *s;
+	unsigned long *ext_tag;
+
+	if ((s = getenv ("logstart")) != NULL) {
+		log_buf = (unsigned char *)simple_strtoul(s, NULL, 16);
+		ext_tag=(unsigned long *)(log_buf)-3;
+		ext_log_start=(unsigned long *)(log_buf)-2;
+		ext_logged_chars=(unsigned long *)(log_buf)-1;
+//		if (*ext_tag!=LOGBUFF_MAGIC) {
+			logged_chars=log_start=0;
+			*ext_tag=LOGBUFF_MAGIC;
+//		}
+		log_size=logged_chars;
+	}
+}
+
+/*
+ * Subroutine:  do_log
+ *
+ * Description: Handler for 'log' command..
+ *
+ * Inputs:	argv[1] contains the subcommand
+ *
+ * Return:      None
+ *
+ */
+int do_log (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	char *s;
+	unsigned long i;
+
+	if (log_buf==NULL) {
+		printf ("No logbuffer defined!  Set 'logstart' to use this feature.\n");
+		return 1;
+	}
+
+	switch (argc) {
+
+	case 2:
+		if (strcmp(argv[1],"show") == 0) {
+			for (i=0; i<logged_chars; i++) {
+				s=log_buf+((log_start+i)&LOG_BUF_MASK);
+				putc(*s);
+			}
+			return 0;
+		} else if (strcmp(argv[1],"reset") == 0) {
+			log_start=0;
+			logged_chars=0;
+			log_size=0;
+			return 0;
+		}
+		printf ("Usage:\n%s\n", cmdtp->usage);
+		return 1;
+
+	case 3:
+		if (strcmp(argv[1],"append") == 0) {
+			logbuff_puts(argv[2]);
+			return 0;
+
+		}
+		printf ("Usage:\n%s\n", cmdtp->usage);
+		return 1;
+
+	default:
+		printf ("Usage:\n%s\n", cmdtp->usage);
+		return 1;
+	}
+}
+
+static int logbuff_printk(const char *line)
+{
+	int i;
+	char *msg, *p, *buf_end;
+	int line_feed;
+	static signed char msg_level = -1;
+
+	strcpy(buf + 3, line);
+	i = strlen(line);
+	buf_end = buf + 3 + i;
+	for (p = buf + 3; p < buf_end; p++) {
+		msg = p;
+		if (msg_level < 0) {
+			if (
+				p[0] != '<' ||
+				p[1] < '0' ||
+				p[1] > '7' ||
+				p[2] != '>'
+			) {
+				p -= 3;
+				p[0] = '<';
+				p[1] = default_message_loglevel + '0';
+				p[2] = '>';
+			} else
+				msg += 3;
+			msg_level = p[1] - '0';
+		}
+		line_feed = 0;
+		for (; p < buf_end; p++) {
+			log_buf[(log_start+log_size) & LOG_BUF_MASK] = *p;
+			if (log_size < LOG_BUF_LEN)
+				log_size++;
+			else
+				log_start++;
+
+			logged_chars++;
+			if (*p == '\n') {
+				line_feed = 1;
+				break;
+			}
+		}
+		if (msg_level < console_loglevel) {
+			printf("%s", msg);
+		}
+		if (line_feed)
+			msg_level = -1;
+	}
+	return i;
+}
+
+#endif /* (CONFIG_LOGBUFFER) */