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
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 static logbuff_t *log;
64 void logbuff_init_ptrs (void)
66 unsigned long tag, post_word;
69 log = (logbuff_t *)(gd->bd->bi_memsize-LOGBUFF_LEN) - 1;
71 /* Set up log version */
72 if ((s = getenv ("logversion")) != NULL)
73 log_version = (int)simple_strtoul (s, NULL, 10);
79 post_word = post_word_load();
81 /* The post routines have setup the word so we can simply test it */
82 if (tag != LOGBUFF_MAGIC || (post_word & POST_COLDBOOT)) {
86 /* No post routines, so we do our own checking */
87 if (tag != LOGBUFF_MAGIC || post_word != LOGBUFF_MAGIC) {
89 post_word_store (LOGBUFF_MAGIC);
92 if (log_version == 2 && (long)log->v2.start > (long)log->v2.con)
93 log->v2.start = log->v2.con;
95 /* Initialize default loglevel if present */
96 if ((s = getenv ("loglevel")) != NULL)
97 console_loglevel = (int)simple_strtoul (s, NULL, 10);
99 gd->post_log_word |= LOGBUFF_INITIALIZED;
102 void logbuff_reset (void)
104 memset (log, 0, sizeof (logbuff_t));
105 if (log_version == 2)
106 log->v2.tag = LOGBUFF_MAGIC;
108 log->v1.tag = LOGBUFF_MAGIC;
111 int drv_logbuff_init (void)
116 /* Device initialization */
117 memset (&logdev, 0, sizeof (logdev));
119 strcpy (logdev.name, "logbuff");
120 logdev.ext = 0; /* No extensions */
121 logdev.flags = DEV_FLAGS_OUTPUT; /* Output only */
122 logdev.putc = logbuff_putc; /* 'putc' function */
123 logdev.puts = logbuff_puts; /* 'puts' function */
125 rc = device_register (&logdev);
127 return (rc == 0) ? 1 : rc;
130 static void logbuff_putc (const char c)
135 logbuff_printk (buf);
138 static void logbuff_puts (const char *s)
143 void logbuff_log(char *msg)
145 if ((gd->post_log_word & LOGBUFF_INITIALIZED)) {
146 logbuff_printk (msg);
148 /* Can happen only for pre-relocated errors as logging */
149 /* at that stage should be disabled */
157 * Description: Handler for 'log' command..
159 * Inputs: argv[1] contains the subcommand
164 int do_log (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
167 unsigned long i, start, size;
169 if (strcmp(argv[1],"append") == 0) {
170 /* Log concatenation of all arguments separated by spaces */
171 for (i=2; i<argc; i++) {
172 logbuff_printk (argv[i]);
173 logbuff_putc ((i<argc-1) ? ' ' : '\n');
181 if (strcmp(argv[1],"show") == 0) {
182 if (log_version == 2) {
183 start = log->v2.start;
184 size = log->v2.end - log->v2.start;
187 start = log->v1.start;
190 for (i=0; i < (size&LOGBUFF_MASK); i++) {
191 s = (char *)log->buf+((start+i)&LOGBUFF_MASK);
195 } else if (strcmp(argv[1],"reset") == 0) {
198 } else if (strcmp(argv[1],"info") == 0) {
199 printf ("Logbuffer at %08lx\n", (unsigned long)log->buf);
200 if (log_version == 2) {
201 printf ("log_start = %08lx\n", log->v2.start);
202 printf ("log_end = %08lx\n", log->v2.end);
203 printf ("logged_chars = %08lx\n", log->v2.chars);
206 printf ("log_start = %08lx\n", log->v1.start);
207 printf ("log_size = %08lx\n", log->v1.size);
208 printf ("logged_chars = %08lx\n", log->v1.chars);
212 printf ("Usage:\n%s\n", cmdtp->usage);
216 printf ("Usage:\n%s\n", cmdtp->usage);
223 "log - manipulate logbuffer\n",
224 "info - show pointer details\n"
225 "log reset - clear contents\n"
226 "log show - show contents\n"
227 "log append <msg> - append <msg> to the logbuffer\n"
230 static int logbuff_printk(const char *line)
233 char *msg, *p, *buf_end;
235 static signed char msg_level = -1;
237 strcpy (buf + 3, line);
239 buf_end = buf + 3 + i;
240 for (p = buf + 3; p < buf_end; p++) {
251 p[1] = default_message_loglevel + '0';
255 msg_level = p[1] - '0';
258 for (; p < buf_end; p++) {
259 if (log_version == 2) {
260 log->buf[log->v2.end & LOGBUFF_MASK] = *p;
262 if (log->v2.end - log->v2.start > LOGBUFF_LEN)
267 log->buf[(log->v1.start + log->v1.size) &
269 if (log->v1.size < LOGBUFF_LEN)
280 if (msg_level < console_loglevel) {