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 #ifdef CONFIG_ALT_LB_ADDR
  63 static volatile logbuff_t *log;
  64 #else
  65 static logbuff_t *log;
  66 #endif
  67 static char *lbuf;
  68
  69 void logbuff_init_ptrs (void)
  70 {
  71         unsigned long tag, post_word;
  72         char *s;
  73
  74 #ifdef CONFIG_ALT_LB_ADDR
  75         log = (logbuff_t *)CONFIG_ALT_LH_ADDR;
  76         lbuf = (char *)CONFIG_ALT_LB_ADDR;
  77 #else
  78         log = (logbuff_t *)(gd->bd->bi_memsize-LOGBUFF_LEN) - 1;
  79         lbuf = (char *)log->buf;
  80 #endif
  81
  82         /* Set up log version */
  83         if ((s = getenv ("logversion")) != NULL)
  84                 log_version = (int)simple_strtoul (s, NULL, 10);
  85
  86         if (log_version == 2)
  87                 tag = log->v2.tag;
  88         else
  89                 tag = log->v1.tag;
  90         post_word = post_word_load();
  91 #ifdef CONFIG_POST
  92         /* The post routines have setup the word so we can simply test it */
  93         if (tag != LOGBUFF_MAGIC || (post_word & POST_COLDBOOT)) {
  94                 logbuff_reset ();
  95         }
  96 #else
  97         /* No post routines, so we do our own checking                    */
  98         if (tag != LOGBUFF_MAGIC || post_word != LOGBUFF_MAGIC) {
  99                 logbuff_reset ();
 100                 post_word_store (LOGBUFF_MAGIC);
 101         }
 102 #endif
 103         if (log_version == 2 && (long)log->v2.start > (long)log->v2.con)
 104                 log->v2.start = log->v2.con;
 105
 106         /* Initialize default loglevel if present */
 107         if ((s = getenv ("loglevel")) != NULL)
 108                 console_loglevel = (int)simple_strtoul (s, NULL, 10);
 109
 110         gd->post_log_word |= LOGBUFF_INITIALIZED;
 111 }
 112
 113 void logbuff_reset (void)
 114 {
 115 #ifndef CONFIG_ALT_LB_ADDR
 116         memset (log, 0, sizeof (logbuff_t));
 117 #endif
 118         if (log_version == 2) {
 119                 log->v2.tag = LOGBUFF_MAGIC;
 120 #ifdef CONFIG_ALT_LB_ADDR
 121                 log->v2.start = 0;
 122                 log->v2.con = 0;
 123                 log->v2.end = 0;
 124                 log->v2.chars = 0;
 125 #endif
 126         } else {
 127                 log->v1.tag = LOGBUFF_MAGIC;
 128 #ifdef CONFIG_ALT_LB_ADDR
 129                 log->v1.dummy = 0;
 130                 log->v1.start = 0;
 131                 log->v1.size = 0;
 132                 log->v1.chars = 0;
 133 #endif
 134         }
 135 }
 136
 137 int drv_logbuff_init (void)
 138 {
 139         device_t logdev;
 140         int rc;
 141
 142         /* Device initialization */
 143         memset (&logdev, 0, sizeof (logdev));
 144
 145         strcpy (logdev.name, "logbuff");
 146         logdev.ext   = 0;                       /* No extensions */
 147         logdev.flags = DEV_FLAGS_OUTPUT;        /* Output only */
 148         logdev.putc  = logbuff_putc;            /* 'putc' function */
 149         logdev.puts  = logbuff_puts;            /* 'puts' function */
 150
 151         rc = device_register (&logdev);
 152
 153         return (rc == 0) ? 1 : rc;
 154 }
 155
 156 static void logbuff_putc (const char c)
 157 {
 158         char buf[2];
 159         buf[0] = c;
 160         buf[1] = '\0';
 161         logbuff_printk (buf);
 162 }
 163
 164 static void logbuff_puts (const char *s)
 165 {
 166         logbuff_printk (s);
 167 }
 168
 169 void logbuff_log(char *msg)
 170 {
 171         if ((gd->post_log_word & LOGBUFF_INITIALIZED)) {
 172                 logbuff_printk (msg);
 173         } else {
 174                 /* Can happen only for pre-relocated errors as logging */
 175                 /* at that stage should be disabled                    */
 176                 puts (msg);
 177         }
 178 }
 179
 180 /*
 181  * Subroutine:  do_log
 182  *
 183  * Description: Handler for 'log' command..
 184  *
 185  * Inputs:      argv[1] contains the subcommand
 186  *
 187  * Return:      None
 188  *
 189  */
 190 int do_log (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 191 {
 192         char *s;
 193         unsigned long i, start, size;
 194
 195         if (strcmp(argv[1],"append") == 0) {
 196                 /* Log concatenation of all arguments separated by spaces */
 197                 for (i=2; i<argc; i++) {
 198                         logbuff_printk (argv[i]);
 199                         logbuff_putc ((i<argc-1) ? ' ' : '\n');
 200                 }
 201                 return 0;
 202         }
 203
 204         switch (argc) {
 205
 206         case 2:
 207                 if (strcmp(argv[1],"show") == 0) {
 208                         if (log_version == 2) {
 209                                 start = log->v2.start;
 210                                 size = log->v2.end - log->v2.start;
 211                         }
 212                         else {
 213                                 start = log->v1.start;
 214                                 size = log->v1.size;
 215                         }
 216                         for (i=0; i < (size&LOGBUFF_MASK); i++) {
 217                                 s = lbuf+((start+i)&LOGBUFF_MASK);
 218                                 putc (*s);
 219                         }
 220                         return 0;
 221                 } else if (strcmp(argv[1],"reset") == 0) {
 222                         logbuff_reset ();
 223                         return 0;
 224                 } else if (strcmp(argv[1],"info") == 0) {
 225                         printf ("Logbuffer   at  %08lx\n", (unsigned long)lbuf);
 226                         if (log_version == 2) {
 227                                 printf ("log_start    =  %08lx\n", log->v2.start);
 228                                 printf ("log_end      =  %08lx\n", log->v2.end);
 229                                 printf ("logged_chars =  %08lx\n", log->v2.chars);
 230                         }
 231                         else {
 232                                 printf ("log_start    =  %08lx\n", log->v1.start);
 233                                 printf ("log_size     =  %08lx\n", log->v1.size);
 234                                 printf ("logged_chars =  %08lx\n", log->v1.chars);
 235                         }
 236                         return 0;
 237                 }
 238                 printf ("Usage:\n%s\n", cmdtp->usage);
 239                 return 1;
 240
 241         default:
 242                 printf ("Usage:\n%s\n", cmdtp->usage);
 243                 return 1;
 244         }
 245 }
 246
 247 U_BOOT_CMD(
 248         log,     255,   1,      do_log,
 249         "log     - manipulate logbuffer\n",
 250         "info   - show pointer details\n"
 251         "log reset  - clear contents\n"
 252         "log show   - show contents\n"
 253         "log append <msg> - append <msg> to the logbuffer\n"
 254 );
 255
 256 static int logbuff_printk(const char *line)
 257 {
 258         int i;
 259         char *msg, *p, *buf_end;
 260         int line_feed;
 261         static signed char msg_level = -1;
 262
 263         strcpy (buf + 3, line);
 264         i = strlen (line);
 265         buf_end = buf + 3 + i;
 266         for (p = buf + 3; p < buf_end; p++) {
 267                 msg = p;
 268                 if (msg_level < 0) {
 269                         if (
 270                                 p[0] != '<' ||
 271                                 p[1] < '0' ||
 272                                 p[1] > '7' ||
 273                                 p[2] != '>'
 274                         ) {
 275                                 p -= 3;
 276                                 p[0] = '<';
 277                                 p[1] = default_message_loglevel + '0';
 278                                 p[2] = '>';
 279                         } else
 280                                 msg += 3;
 281                         msg_level = p[1] - '0';
 282                 }
 283                 line_feed = 0;
 284                 for (; p < buf_end; p++) {
 285                         if (log_version == 2) {
 286                                 lbuf[log->v2.end & LOGBUFF_MASK] = *p;
 287                                 log->v2.end++;
 288                                 if (log->v2.end - log->v2.start > LOGBUFF_LEN)
 289                                         log->v2.start++;
 290                                 log->v2.chars++;
 291                         }
 292                         else {
 293                                 lbuf[(log->v1.start + log->v1.size) &
 294                                          LOGBUFF_MASK] = *p;
 295                                 if (log->v1.size < LOGBUFF_LEN)
 296                                         log->v1.size++;
 297                                 else
 298                                         log->v1.start++;
 299                                 log->v1.chars++;
 300                         }
 301                         if (*p == '\n') {
 302                                 line_feed = 1;
 303                                 break;
 304                         }
 305                 }
 306                 if (msg_level < console_loglevel) {
 307                         printf("%s", msg);
 308                 }
 309                 if (line_feed)
 310                         msg_level = -1;
 311         }
 312         return i;
 313 }