2 * (C) Copyright 2002-2007
3 * Detlev Zundel, DENX Software Engineering, dzu@denx.de.
5 * Code used from linux/kernel/printk.c
6 * Copyright (C) 1991, 1992 Linus Torvalds
8 * See file CREDITS for list of people who contributed to this
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2 of
14 * the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28 * After relocating the code, the environment variable "loglevel" is
29 * copied to console_loglevel. The functionality is similar to the
30 * handling in the Linux kernel, i.e. messages logged with a priority
31 * less than console_loglevel are also output to stdout.
33 * If you want messages with the default level (e.g. POST messages) to
34 * appear on stdout also, make sure the environment variable
35 * "loglevel" is set at boot time to a number higher than
36 * default_message_loglevel below.
40 * Logbuffer handling routines
45 #include <stdio_dev.h>
49 DECLARE_GLOBAL_DATA_PTR;
51 /* Local prototypes */
52 static void logbuff_putc (const char c);
53 static void logbuff_puts (const char *s);
54 static int logbuff_printk(const char *line);
56 static char buf[1024];
58 /* This combination will not print messages with the default loglevel */
59 static unsigned console_loglevel = 3;
60 static unsigned default_message_loglevel = 4;
61 static unsigned log_version = 1;
62 #ifdef CONFIG_ALT_LB_ADDR
63 static volatile logbuff_t *log;
65 static logbuff_t *log;
69 unsigned long __logbuffer_base(void)
71 return CONFIG_SYS_SDRAM_BASE + gd->ram_size - LOGBUFF_LEN;
73 unsigned long logbuffer_base (void) __attribute__((weak, alias("__logbuffer_base")));
75 void logbuff_init_ptrs (void)
77 unsigned long tag, post_word;
80 #ifdef CONFIG_ALT_LB_ADDR
81 log = (logbuff_t *)CONFIG_ALT_LH_ADDR;
82 lbuf = (char *)CONFIG_ALT_LB_ADDR;
84 log = (logbuff_t *)(logbuffer_base ()) - 1;
85 lbuf = (char *)log->buf;
88 /* Set up log version */
89 if ((s = getenv ("logversion")) != NULL)
90 log_version = (int)simple_strtoul (s, NULL, 10);
96 post_word = post_word_load();
98 /* The post routines have setup the word so we can simply test it */
99 if (tag != LOGBUFF_MAGIC || (post_word & POST_COLDBOOT)) {
103 /* No post routines, so we do our own checking */
104 if (tag != LOGBUFF_MAGIC || post_word != LOGBUFF_MAGIC) {
106 post_word_store (LOGBUFF_MAGIC);
109 if (log_version == 2 && (long)log->v2.start > (long)log->v2.con)
110 log->v2.start = log->v2.con;
112 /* Initialize default loglevel if present */
113 if ((s = getenv ("loglevel")) != NULL)
114 console_loglevel = (int)simple_strtoul (s, NULL, 10);
116 gd->flags |= GD_FLG_LOGINIT;
119 void logbuff_reset (void)
121 #ifndef CONFIG_ALT_LB_ADDR
122 memset (log, 0, sizeof (logbuff_t));
124 if (log_version == 2) {
125 log->v2.tag = LOGBUFF_MAGIC;
126 #ifdef CONFIG_ALT_LB_ADDR
133 log->v1.tag = LOGBUFF_MAGIC;
134 #ifdef CONFIG_ALT_LB_ADDR
143 int drv_logbuff_init (void)
145 struct stdio_dev logdev;
148 /* Device initialization */
149 memset (&logdev, 0, sizeof (logdev));
151 strcpy (logdev.name, "logbuff");
152 logdev.ext = 0; /* No extensions */
153 logdev.flags = DEV_FLAGS_OUTPUT; /* Output only */
154 logdev.putc = logbuff_putc; /* 'putc' function */
155 logdev.puts = logbuff_puts; /* 'puts' function */
157 rc = stdio_register (&logdev);
159 return (rc == 0) ? 1 : rc;
162 static void logbuff_putc (const char c)
167 logbuff_printk (buf);
170 static void logbuff_puts (const char *s)
175 void logbuff_log(char *msg)
177 if ((gd->flags & GD_FLG_LOGINIT)) {
178 logbuff_printk (msg);
180 /* Can happen only for pre-relocated errors as logging */
181 /* at that stage should be disabled */
189 * Description: Handler for 'log' command..
191 * Inputs: argv[1] contains the subcommand
196 int do_log (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
199 unsigned long i, start, size;
201 if (strcmp(argv[1],"append") == 0) {
202 /* Log concatenation of all arguments separated by spaces */
203 for (i=2; i<argc; i++) {
204 logbuff_printk (argv[i]);
205 logbuff_putc ((i<argc-1) ? ' ' : '\n');
213 if (strcmp(argv[1],"show") == 0) {
214 if (log_version == 2) {
215 start = log->v2.start;
216 size = log->v2.end - log->v2.start;
219 start = log->v1.start;
222 for (i=0; i < (size&LOGBUFF_MASK); i++) {
223 s = lbuf+((start+i)&LOGBUFF_MASK);
227 } else if (strcmp(argv[1],"reset") == 0) {
230 } else if (strcmp(argv[1],"info") == 0) {
231 printf ("Logbuffer at %08lx\n", (unsigned long)lbuf);
232 if (log_version == 2) {
233 printf ("log_start = %08lx\n", log->v2.start);
234 printf ("log_end = %08lx\n", log->v2.end);
235 printf ("logged_chars = %08lx\n", log->v2.chars);
238 printf ("log_start = %08lx\n", log->v1.start);
239 printf ("log_size = %08lx\n", log->v1.size);
240 printf ("logged_chars = %08lx\n", log->v1.chars);
244 return cmd_usage(cmdtp);
247 return cmd_usage(cmdtp);
253 "manipulate logbuffer",
254 "info - show pointer details\n"
255 "log reset - clear contents\n"
256 "log show - show contents\n"
257 "log append <msg> - append <msg> to the logbuffer"
260 static int logbuff_printk(const char *line)
263 char *msg, *p, *buf_end;
265 static signed char msg_level = -1;
267 strcpy (buf + 3, line);
269 buf_end = buf + 3 + i;
270 for (p = buf + 3; p < buf_end; p++) {
281 p[1] = default_message_loglevel + '0';
285 msg_level = p[1] - '0';
288 for (; p < buf_end; p++) {
289 if (log_version == 2) {
290 lbuf[log->v2.end & LOGBUFF_MASK] = *p;
292 if (log->v2.end - log->v2.start > LOGBUFF_LEN)
297 lbuf[(log->v1.start + log->v1.size) &
299 if (log->v1.size < LOGBUFF_LEN)
310 if (msg_level < console_loglevel) {