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git.ipfire.org Git - people/ms/u-boot.git/blob - common/cmd_log.c
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
) {