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 #if defined(CONFIG_LOGBUFFER)
53 /* Local prototypes */
54 static void logbuff_putc (const char c);
55 static void logbuff_puts (const char *s);
56 static int logbuff_printk(const char *line);
58 static char buf[1024];
60 /* This combination will not print messages with the default loglevel */
61 static unsigned console_loglevel = 3;
62 static unsigned default_message_loglevel = 4;
63 static unsigned char *log_buf = NULL;
64 static unsigned long *ext_log_size;
65 static unsigned long *ext_log_start;
66 static unsigned long *ext_logged_chars;
67 #define log_size (*ext_log_size)
68 #define log_start (*ext_log_start)
69 #define logged_chars (*ext_logged_chars)
71 /* Forced by code, eh! */
72 #define LOGBUFF_MAGIC 0xc0de4ced
74 /* The mapping used here has to be the same as in setup_ext_logbuff ()
75 in linux/kernel/printk */
76 void logbuff_init_ptrs (void)
78 unsigned long *ext_tag;
79 unsigned long post_word;
82 log_buf = (unsigned char *)(gd->bd->bi_memsize-LOGBUFF_LEN);
83 ext_tag = (unsigned long *)(log_buf)-4;
84 ext_log_start = (unsigned long *)(log_buf)-3;
85 ext_log_size = (unsigned long *)(log_buf)-2;
86 ext_logged_chars = (unsigned long *)(log_buf)-1;
87 post_word = post_word_load();
89 /* The post routines have setup the word so we can simply test it */
90 if (post_word_load () & POST_COLDBOOT) {
91 logged_chars = log_size = log_start = 0;
92 *ext_tag = LOGBUFF_MAGIC;
95 /* No post routines, so we do our own checking */
96 if (post_word != LOGBUFF_MAGIC) {
97 logged_chars = log_size = log_start = 0;
98 post_word_store (LOGBUFF_MAGIC);
99 *ext_tag = LOGBUFF_MAGIC;
102 /* Initialize default loglevel if present */
103 if ((s = getenv ("loglevel")) != NULL)
104 console_loglevel = (int)simple_strtoul (s, NULL, 10);
106 gd->post_log_word |= LOGBUFF_INITIALIZED;
109 int drv_logbuff_init (void)
114 /* Device initialization */
115 memset (&logdev, 0, sizeof (logdev));
117 strcpy (logdev.name, "logbuff");
118 logdev.ext = 0; /* No extensions */
119 logdev.flags = DEV_FLAGS_OUTPUT; /* Output only */
120 logdev.putc = logbuff_putc; /* 'putc' function */
121 logdev.puts = logbuff_puts; /* 'puts' function */
123 rc = device_register (&logdev);
125 return (rc == 0) ? 1 : rc;
128 static void logbuff_putc (const char c)
133 logbuff_printk (buf);
136 static void logbuff_puts (const char *s)
141 void logbuff_log(char *msg)
143 if ((gd->post_log_word & LOGBUFF_INITIALIZED)) {
144 logbuff_printk (msg);
146 /* Can happen only for pre-relocated errors as logging */
147 /* at that stage should be disabled */
155 * Description: Handler for 'log' command..
157 * Inputs: argv[1] contains the subcommand
162 int do_log (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
167 if (strcmp(argv[1],"append") == 0) {
168 /* Log concatenation of all arguments separated by spaces */
169 for (i=2; i<argc; i++) {
170 logbuff_printk (argv[i]);
171 logbuff_putc ((i<argc-1) ? ' ' : '\n');
179 if (strcmp(argv[1],"show") == 0) {
180 for (i=0; i < (log_size&LOGBUFF_MASK); i++) {
181 s = (char *)log_buf+((log_start+i)&LOGBUFF_MASK);
185 } else if (strcmp(argv[1],"reset") == 0) {
190 } else if (strcmp(argv[1],"info") == 0) {
191 printf ("Logbuffer at %08lx\n", (unsigned long)log_buf);
192 printf ("log_start = %08lx\n", log_start);
193 printf ("log_size = %08lx\n", log_size);
194 printf ("logged_chars = %08lx\n", logged_chars);
197 printf ("Usage:\n%s\n", cmdtp->usage);
201 printf ("Usage:\n%s\n", cmdtp->usage);
205 #if defined(CONFIG_LOGBUFFER)
208 "log - manipulate logbuffer\n",
209 "info - show pointer details\n"
210 "log reset - clear contents\n"
211 "log show - show contents\n"
212 "log append <msg> - append <msg> to the logbuffer\n"
214 #endif /* CONFIG_LOGBUFFER */
215 static int logbuff_printk(const char *line)
218 char *msg, *p, *buf_end;
220 static signed char msg_level = -1;
222 strcpy (buf + 3, line);
224 buf_end = buf + 3 + i;
225 for (p = buf + 3; p < buf_end; p++) {
236 p[1] = default_message_loglevel + '0';
240 msg_level = p[1] - '0';
243 for (; p < buf_end; p++) {
244 log_buf[(log_start+log_size) & LOGBUFF_MASK] = *p;
245 if (log_size < LOGBUFF_LEN)
256 if (msg_level < console_loglevel) {
265 #endif /* (CONFIG_LOGBUFFER) */