Add common memory fixup function
[platform/kernel/u-boot.git] / common / cmd_log.c
1 /*
2  * (C) Copyright 2002-2007
3  * Detlev Zundel, DENX Software Engineering, dzu@denx.de.
4  *
5  * Code used from linux/kernel/printk.c
6  * Copyright (C) 1991, 1992  Linus Torvalds
7  *
8  * See file CREDITS for list of people who contributed to this
9  * project.
10  *
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.
15  *
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.
20  *
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,
24  * MA 02111-1307 USA
25  *
26  * Comments:
27  *
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.
32  *
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.
37  */
38
39 /*
40  * Logbuffer handling routines
41  */
42
43 #include <common.h>
44 #include <command.h>
45 #include <devices.h>
46 #include <post.h>
47 #include <logbuff.h>
48
49 DECLARE_GLOBAL_DATA_PTR;
50
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);
55
56 static char buf[1024];
57
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;
63
64 void logbuff_init_ptrs (void)
65 {
66         unsigned long tag, post_word;
67         char *s;
68
69         log = (logbuff_t *)(gd->bd->bi_memsize-LOGBUFF_LEN) - 1;
70
71         /* Set up log version */
72         if ((s = getenv ("logversion")) != NULL)
73                 log_version = (int)simple_strtoul (s, NULL, 10);
74
75         if (log_version == 2)
76                 tag = log->v2.tag;
77         else
78                 tag = log->v1.tag;
79         post_word = post_word_load();
80 #ifdef CONFIG_POST
81         /* The post routines have setup the word so we can simply test it */
82         if (tag != LOGBUFF_MAGIC || (post_word & POST_COLDBOOT)) {
83                 logbuff_reset ();
84         }
85 #else
86         /* No post routines, so we do our own checking                    */
87         if (tag != LOGBUFF_MAGIC || post_word != LOGBUFF_MAGIC) {
88                 logbuff_reset ();
89                 post_word_store (LOGBUFF_MAGIC);
90         }
91 #endif
92         if (log_version == 2 && (long)log->v2.start > (long)log->v2.con)
93                 log->v2.start = log->v2.con;
94
95         /* Initialize default loglevel if present */
96         if ((s = getenv ("loglevel")) != NULL)
97                 console_loglevel = (int)simple_strtoul (s, NULL, 10);
98
99         gd->post_log_word |= LOGBUFF_INITIALIZED;
100 }
101
102 void logbuff_reset (void)
103 {
104         memset (log, 0, sizeof (logbuff_t));
105         if (log_version == 2)
106                 log->v2.tag = LOGBUFF_MAGIC;
107         else
108                 log->v1.tag = LOGBUFF_MAGIC;
109 }
110
111 int drv_logbuff_init (void)
112 {
113         device_t logdev;
114         int rc;
115
116         /* Device initialization */
117         memset (&logdev, 0, sizeof (logdev));
118
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 */
124
125         rc = device_register (&logdev);
126
127         return (rc == 0) ? 1 : rc;
128 }
129
130 static void logbuff_putc (const char c)
131 {
132         char buf[2];
133         buf[0] = c;
134         buf[1] = '\0';
135         logbuff_printk (buf);
136 }
137
138 static void logbuff_puts (const char *s)
139 {
140         logbuff_printk (s);
141 }
142
143 void logbuff_log(char *msg)
144 {
145         if ((gd->post_log_word & LOGBUFF_INITIALIZED)) {
146                 logbuff_printk (msg);
147         } else {
148                 /* Can happen only for pre-relocated errors as logging */
149                 /* at that stage should be disabled                    */
150                 puts (msg);
151         }
152 }
153
154 /*
155  * Subroutine:  do_log
156  *
157  * Description: Handler for 'log' command..
158  *
159  * Inputs:      argv[1] contains the subcommand
160  *
161  * Return:      None
162  *
163  */
164 int do_log (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
165 {
166         char *s;
167         unsigned long i, start, size;
168
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');
174                 }
175                 return 0;
176         }
177
178         switch (argc) {
179
180         case 2:
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;
185                         }
186                         else {
187                                 start = log->v1.start;
188                                 size = log->v1.size;
189                         }
190                         for (i=0; i < (size&LOGBUFF_MASK); i++) {
191                                 s = (char *)log->buf+((start+i)&LOGBUFF_MASK);
192                                 putc (*s);
193                         }
194                         return 0;
195                 } else if (strcmp(argv[1],"reset") == 0) {
196                         logbuff_reset ();
197                         return 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);
204                         }
205                         else {
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);
209                         }
210                         return 0;
211                 }
212                 printf ("Usage:\n%s\n", cmdtp->usage);
213                 return 1;
214
215         default:
216                 printf ("Usage:\n%s\n", cmdtp->usage);
217                 return 1;
218         }
219 }
220
221 U_BOOT_CMD(
222         log,     255,   1,      do_log,
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"
228 );
229
230 static int logbuff_printk(const char *line)
231 {
232         int i;
233         char *msg, *p, *buf_end;
234         int line_feed;
235         static signed char msg_level = -1;
236
237         strcpy (buf + 3, line);
238         i = strlen (line);
239         buf_end = buf + 3 + i;
240         for (p = buf + 3; p < buf_end; p++) {
241                 msg = p;
242                 if (msg_level < 0) {
243                         if (
244                                 p[0] != '<' ||
245                                 p[1] < '0' ||
246                                 p[1] > '7' ||
247                                 p[2] != '>'
248                         ) {
249                                 p -= 3;
250                                 p[0] = '<';
251                                 p[1] = default_message_loglevel + '0';
252                                 p[2] = '>';
253                         } else
254                                 msg += 3;
255                         msg_level = p[1] - '0';
256                 }
257                 line_feed = 0;
258                 for (; p < buf_end; p++) {
259                         if (log_version == 2) {
260                                 log->buf[log->v2.end & LOGBUFF_MASK] = *p;
261                                 log->v2.end++;
262                                 if (log->v2.end - log->v2.start > LOGBUFF_LEN)
263                                         log->v2.start++;
264                                 log->v2.chars++;
265                         }
266                         else {
267                                 log->buf[(log->v1.start + log->v1.size) &
268                                          LOGBUFF_MASK] = *p;
269                                 if (log->v1.size < LOGBUFF_LEN)
270                                         log->v1.size++;
271                                 else
272                                         log->v1.start++;
273                                 log->v1.chars++;
274                         }
275                         if (*p == '\n') {
276                                 line_feed = 1;
277                                 break;
278                         }
279                 }
280                 if (msg_level < console_loglevel) {
281                         printf("%s", msg);
282                 }
283                 if (line_feed)
284                         msg_level = -1;
285         }
286         return i;
287 }