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 #if defined(CONFIG_LOGBUFFER)
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 char *log_buf = NULL;
62 static unsigned long *ext_log_size;
63 static unsigned long *ext_log_start;
64 static unsigned long *ext_logged_chars;
65 #define log_size (*ext_log_size)
66 #define log_start (*ext_log_start)
67 #define logged_chars (*ext_logged_chars)
69 /* Forced by code, eh! */
70 #define LOGBUFF_MAGIC 0xc0de4ced
72 /* The mapping used here has to be the same as in setup_ext_logbuff ()
73 in linux/kernel/printk */
74 void logbuff_init_ptrs (void)
76 DECLARE_GLOBAL_DATA_PTR;
79 log_buf = (unsigned char *)(gd->bd->bi_memsize-LOGBUFF_LEN);
80 ext_log_start = (unsigned long *)(log_buf)-3;
81 ext_log_size = (unsigned long *)(log_buf)-2;
82 ext_logged_chars = (unsigned long *)(log_buf)-1;
84 /* The post routines have setup the word so we can simply test it */
85 if (post_word_load () & POST_POWERON) {
86 logged_chars = log_size = log_start = 0;
89 /* No post routines, so we do our own checking */
90 if (post_word_load () != LOGBUFF_MAGIC) {
91 logged_chars = log_size = log_start = 0;
92 post_word_store (LOGBUFF_MAGIC);
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 int drv_logbuff_init (void)
107 /* Device initialization */
108 memset (&logdev, 0, sizeof (logdev));
110 strcpy (logdev.name, "logbuff");
111 logdev.ext = 0; /* No extensions */
112 logdev.flags = DEV_FLAGS_OUTPUT; /* Output only */
113 logdev.putc = logbuff_putc; /* 'putc' function */
114 logdev.puts = logbuff_puts; /* 'puts' function */
116 rc = device_register (&logdev);
118 return (rc == 0) ? 1 : rc;
121 static void logbuff_putc (const char c)
126 logbuff_printk (buf);
129 static void logbuff_puts (const char *s)
134 void logbuff_log(char *msg)
136 DECLARE_GLOBAL_DATA_PTR;
138 if ((gd->post_log_word & LOGBUFF_INITIALIZED)) {
139 logbuff_printk (msg);
141 /* Can happen only for pre-relocated errors as logging */
142 /* at that stage should be disabled */
150 * Description: Handler for 'log' command..
152 * Inputs: argv[1] contains the subcommand
157 int do_log (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
162 if (strcmp(argv[1],"append") == 0) {
163 /* Log concatenation of all arguments separated by spaces */
164 for (i=2; i<argc; i++) {
166 logbuff_printk (argv[i]);
169 logbuff_puts (argv[i]);
178 if (strcmp(argv[1],"show") == 0) {
179 for (i=0; i < (log_size&LOGBUFF_MASK); i++) {
180 s = log_buf+((log_start+i)&LOGBUFF_MASK);
184 } else if (strcmp(argv[1],"reset") == 0) {
189 } else if (strcmp(argv[1],"info") == 0) {
190 printf ("Logbuffer at %08lx\n", (unsigned long)log_buf);
191 printf ("log_start = %08lx\n", log_start);
192 printf ("log_size = %08lx\n", log_size);
193 printf ("logged_chars = %08lx\n", logged_chars);
196 printf ("Usage:\n%s\n", cmdtp->usage);
200 printf ("Usage:\n%s\n", cmdtp->usage);
204 #if defined(CONFIG_LOGBUFFER)
205 cmd_tbl_t U_BOOT_CMD(LOG) = MK_CMD_ENTRY(
206 "log", 255, 1, do_log,
207 "log - manipulate logbuffer\n",
208 "log info - show pointer details\n"
209 "log reset - clear contents\n"
210 "log show - show contents\n"
211 "log append <msg> - append <msg> to the logbuffer\n"
213 #endif /* CONFIG_LOGBUFFER */
214 static int logbuff_printk(const char *line)
217 char *msg, *p, *buf_end;
219 static signed char msg_level = -1;
221 strcpy (buf + 3, line);
223 buf_end = buf + 3 + i;
224 for (p = buf + 3; p < buf_end; p++) {
235 p[1] = default_message_loglevel + '0';
239 msg_level = p[1] - '0';
242 for (; p < buf_end; p++) {
243 log_buf[(log_start+log_size) & LOGBUFF_MASK] = *p;
244 if (log_size < LOGBUFF_LEN)
255 if (msg_level < console_loglevel) {
264 #endif /* (CONFIG_LOGBUFFER) */