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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 #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 log_version
= 1;
64 static logbuff_t
*log
;
66 void logbuff_init_ptrs (void)
68 unsigned long tag
, post_word
;
71 log
= (logbuff_t
*)(gd
->bd
->bi_memsize
-LOGBUFF_LEN
) - 1;
73 /* Set up log version */
74 if ((s
= getenv ("logversion")) != NULL
)
75 log_version
= (int)simple_strtoul (s
, NULL
, 10);
81 post_word
= post_word_load();
83 /* The post routines have setup the word so we can simply test it */
84 if (tag
!= LOGBUFF_MAGIC
|| (post_word
& POST_COLDBOOT
)) {
88 /* No post routines, so we do our own checking */
89 if (tag
!= LOGBUFF_MAGIC
|| post_word
!= LOGBUFF_MAGIC
) {
91 post_word_store (LOGBUFF_MAGIC
);
94 if (log_version
== 2 && (long)log
->v2
.start
> (long)log
->v2
.con
)
95 log
->v2
.start
= log
->v2
.con
;
97 /* Initialize default loglevel if present */
98 if ((s
= getenv ("loglevel")) != NULL
)
99 console_loglevel
= (int)simple_strtoul (s
, NULL
, 10);
101 gd
->post_log_word
|= LOGBUFF_INITIALIZED
;
104 void logbuff_reset (void)
106 memset (log
, 0, sizeof (logbuff_t
));
107 if (log_version
== 2)
108 log
->v2
.tag
= LOGBUFF_MAGIC
;
110 log
->v1
.tag
= LOGBUFF_MAGIC
;
113 int drv_logbuff_init (void)
118 /* Device initialization */
119 memset (&logdev
, 0, sizeof (logdev
));
121 strcpy (logdev
.name
, "logbuff");
122 logdev
.ext
= 0; /* No extensions */
123 logdev
.flags
= DEV_FLAGS_OUTPUT
; /* Output only */
124 logdev
.putc
= logbuff_putc
; /* 'putc' function */
125 logdev
.puts
= logbuff_puts
; /* 'puts' function */
127 rc
= device_register (&logdev
);
129 return (rc
== 0) ? 1 : rc
;
132 static void logbuff_putc (const char c
)
137 logbuff_printk (buf
);
140 static void logbuff_puts (const char *s
)
145 void logbuff_log(char *msg
)
147 if ((gd
->post_log_word
& LOGBUFF_INITIALIZED
)) {
148 logbuff_printk (msg
);
150 /* Can happen only for pre-relocated errors as logging */
151 /* at that stage should be disabled */
159 * Description: Handler for 'log' command..
161 * Inputs: argv[1] contains the subcommand
166 int do_log (cmd_tbl_t
*cmdtp
, int flag
, int argc
, char *argv
[])
169 unsigned long i
, start
, size
;
171 if (strcmp(argv
[1],"append") == 0) {
172 /* Log concatenation of all arguments separated by spaces */
173 for (i
=2; i
<argc
; i
++) {
174 logbuff_printk (argv
[i
]);
175 logbuff_putc ((i
<argc
-1) ? ' ' : '\n');
183 if (strcmp(argv
[1],"show") == 0) {
184 if (log_version
== 2) {
185 start
= log
->v2
.start
;
186 size
= log
->v2
.end
- log
->v2
.start
;
189 start
= log
->v1
.start
;
192 for (i
=0; i
< (size
&LOGBUFF_MASK
); i
++) {
193 s
= (char *)log
->buf
+((start
+i
)&LOGBUFF_MASK
);
197 } else if (strcmp(argv
[1],"reset") == 0) {
200 } else if (strcmp(argv
[1],"info") == 0) {
201 printf ("Logbuffer at %08lx\n", (unsigned long)log
->buf
);
202 if (log_version
== 2) {
203 printf ("log_start = %08lx\n", log
->v2
.start
);
204 printf ("log_end = %08lx\n", log
->v2
.end
);
205 printf ("logged_chars = %08lx\n", log
->v2
.chars
);
208 printf ("log_start = %08lx\n", log
->v1
.start
);
209 printf ("log_size = %08lx\n", log
->v1
.size
);
210 printf ("logged_chars = %08lx\n", log
->v1
.chars
);
214 printf ("Usage:\n%s\n", cmdtp
->usage
);
218 printf ("Usage:\n%s\n", cmdtp
->usage
);
225 "log - manipulate logbuffer\n",
226 "info - show pointer details\n"
227 "log reset - clear contents\n"
228 "log show - show contents\n"
229 "log append <msg> - append <msg> to the logbuffer\n"
232 static int logbuff_printk(const char *line
)
235 char *msg
, *p
, *buf_end
;
237 static signed char msg_level
= -1;
239 strcpy (buf
+ 3, line
);
241 buf_end
= buf
+ 3 + i
;
242 for (p
= buf
+ 3; p
< buf_end
; p
++) {
253 p
[1] = default_message_loglevel
+ '0';
257 msg_level
= p
[1] - '0';
260 for (; p
< buf_end
; p
++) {
261 if (log_version
== 2) {
262 log
->buf
[log
->v2
.end
& LOGBUFF_MASK
] = *p
;
264 if (log
->v2
.end
- log
->v2
.start
> LOGBUFF_LEN
)
269 log
->buf
[(log
->v1
.start
+ log
->v1
.size
) &
271 if (log
->v1
.size
< LOGBUFF_LEN
)
282 if (msg_level
< console_loglevel
) {
291 #endif /* (CONFIG_LOGBUFFER) */