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  * SPDX-License-Identifier:     GPL-2.0+
   9  *
  10  * Comments:
  11  *
  12  * After relocating the code, the environment variable "loglevel" is
  13  * copied to console_loglevel.  The functionality is similar to the
  14  * handling in the Linux kernel, i.e. messages logged with a priority
  15  * less than console_loglevel are also output to stdout.
  16  *
  17  * If you want messages with the default level (e.g. POST messages) to
  18  * appear on stdout also, make sure the environment variable
  19  * "loglevel" is set at boot time to a number higher than
  20  * default_message_loglevel below.
  21  */
  22
  23 /*
  24  * Logbuffer handling routines
  25  */
  26
  27 #include <common.h>
  28 #include <command.h>
  29 #include <stdio_dev.h>
  30 #include <post.h>
  31 #include <logbuff.h>
  32
  33 DECLARE_GLOBAL_DATA_PTR;
  34
  35 /* Local prototypes */
  36 static void logbuff_putc(const char c);
  37 static void logbuff_puts(const char *s);
  38 static int logbuff_printk(const char *line);
  39
  40 static char buf[1024];
  41
  42 /* This combination will not print messages with the default loglevel */
  43 static unsigned console_loglevel = 3;
  44 static unsigned default_message_loglevel = 4;
  45 static unsigned log_version = 1;
  46 #ifdef CONFIG_ALT_LB_ADDR
  47 static volatile logbuff_t *log;
  48 #else
  49 static logbuff_t *log;
  50 #endif
  51 static char *lbuf;
  52
  53 unsigned long __logbuffer_base(void)
  54 {
  55         return CONFIG_SYS_SDRAM_BASE + gd->ram_size - LOGBUFF_LEN;
  56 }
  57 unsigned long logbuffer_base(void)
  58 __attribute__((weak, alias("__logbuffer_base")));
  59
  60 void logbuff_init_ptrs(void)
  61 {
  62         unsigned long tag, post_word;
  63         char *s;
  64
  65 #ifdef CONFIG_ALT_LB_ADDR
  66         log = (logbuff_t *)CONFIG_ALT_LH_ADDR;
  67         lbuf = (char *)CONFIG_ALT_LB_ADDR;
  68 #else
  69         log = (logbuff_t *)(logbuffer_base()) - 1;
  70         lbuf = (char *)log->buf;
  71 #endif
  72
  73         /* Set up log version */
  74         if ((s = getenv ("logversion")) != NULL)
  75                 log_version = (int)simple_strtoul(s, NULL, 10);
  76
  77         if (log_version == 2)
  78                 tag = log->v2.tag;
  79         else
  80                 tag = log->v1.tag;
  81         post_word = post_word_load();
  82 #ifdef CONFIG_POST
  83         /* The post routines have setup the word so we can simply test it */
  84         if (tag != LOGBUFF_MAGIC || (post_word & POST_COLDBOOT))
  85                 logbuff_reset();
  86 #else
  87         /* No post routines, so we do our own checking                    */
  88         if (tag != LOGBUFF_MAGIC || post_word != LOGBUFF_MAGIC) {
  89                 logbuff_reset ();
  90                 post_word_store (LOGBUFF_MAGIC);
  91         }
  92 #endif
  93         if (log_version == 2 && (long)log->v2.start > (long)log->v2.con)
  94                 log->v2.start = log->v2.con;
  95
  96         /* Initialize default loglevel if present */
  97         if ((s = getenv ("loglevel")) != NULL)
  98                 console_loglevel = (int)simple_strtoul(s, NULL, 10);
  99
 100         gd->flags |= GD_FLG_LOGINIT;
 101 }
 102
 103 void logbuff_reset(void)
 104 {
 105 #ifndef CONFIG_ALT_LB_ADDR
 106         memset(log, 0, sizeof(logbuff_t));
 107 #endif
 108         if (log_version == 2) {
 109                 log->v2.tag = LOGBUFF_MAGIC;
 110 #ifdef CONFIG_ALT_LB_ADDR
 111                 log->v2.start = 0;
 112                 log->v2.con = 0;
 113                 log->v2.end = 0;
 114                 log->v2.chars = 0;
 115 #endif
 116         } else {
 117                 log->v1.tag = LOGBUFF_MAGIC;
 118 #ifdef CONFIG_ALT_LB_ADDR
 119                 log->v1.dummy = 0;
 120                 log->v1.start = 0;
 121                 log->v1.size = 0;
 122                 log->v1.chars = 0;
 123 #endif
 124         }
 125 }
 126
 127 int drv_logbuff_init(void)
 128 {
 129         struct stdio_dev logdev;
 130         int rc;
 131
 132         /* Device initialization */
 133         memset (&logdev, 0, sizeof (logdev));
 134
 135         strcpy (logdev.name, "logbuff");
 136         logdev.ext   = 0;                       /* No extensions */
 137         logdev.flags = DEV_FLAGS_OUTPUT;        /* Output only */
 138         logdev.putc  = logbuff_putc;            /* 'putc' function */
 139         logdev.puts  = logbuff_puts;            /* 'puts' function */
 140
 141         rc = stdio_register(&logdev);
 142
 143         return (rc == 0) ? 1 : rc;
 144 }
 145
 146 static void logbuff_putc(const char c)
 147 {
 148         char buf[2];
 149         buf[0] = c;
 150         buf[1] = '\0';
 151         logbuff_printk(buf);
 152 }
 153
 154 static void logbuff_puts(const char *s)
 155 {
 156         logbuff_printk (s);
 157 }
 158
 159 void logbuff_log(char *msg)
 160 {
 161         if ((gd->flags & GD_FLG_LOGINIT)) {
 162                 logbuff_printk(msg);
 163         } else {
 164                 /*
 165                  * Can happen only for pre-relocated errors as logging
 166                  * at that stage should be disabled
 167                  */
 168                 puts (msg);
 169         }
 170 }
 171
 172 /*
 173  * Subroutine:  do_log
 174  *
 175  * Description: Handler for 'log' command..
 176  *
 177  * Inputs:      argv[1] contains the subcommand
 178  *
 179  * Return:      None
 180  *
 181  */
 182 int do_log(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 183 {
 184         char *s;
 185         unsigned long i, start, size;
 186
 187         if (strcmp(argv[1], "append") == 0) {
 188                 /* Log concatenation of all arguments separated by spaces */
 189                 for (i = 2; i < argc; i++) {
 190                         logbuff_printk(argv[i]);
 191                         logbuff_putc((i < argc - 1) ? ' ' : '\n');
 192                 }
 193                 return 0;
 194         }
 195
 196         switch (argc) {
 197
 198         case 2:
 199                 if (strcmp(argv[1], "show") == 0) {
 200                         if (log_version == 2) {
 201                                 start = log->v2.start;
 202                                 size = log->v2.end - log->v2.start;
 203                         } else {
 204                                 start = log->v1.start;
 205                                 size = log->v1.size;
 206                         }
 207                         if (size > LOGBUFF_LEN)
 208                                 size = LOGBUFF_LEN;
 209                         for (i = 0; i < size; i++) {
 210                                 s = lbuf + ((start + i) & LOGBUFF_MASK);
 211                                 putc(*s);
 212                         }
 213                         return 0;
 214                 } else if (strcmp(argv[1], "reset") == 0) {
 215                         logbuff_reset();
 216                         return 0;
 217                 } else if (strcmp(argv[1], "info") == 0) {
 218                         printf("Logbuffer   at  %08lx\n", (unsigned long)lbuf);
 219                         if (log_version == 2) {
 220                                 printf("log_start    =  %08lx\n",
 221                                         log->v2.start);
 222                                 printf("log_end      =  %08lx\n", log->v2.end);
 223                                 printf("log_con      =  %08lx\n", log->v2.con);
 224                                 printf("logged_chars =  %08lx\n",
 225                                         log->v2.chars);
 226                         }
 227                         else {
 228                                 printf("log_start    =  %08lx\n",
 229                                         log->v1.start);
 230                                 printf("log_size     =  %08lx\n",
 231                                         log->v1.size);
 232                                 printf("logged_chars =  %08lx\n",
 233                                         log->v1.chars);
 234                         }
 235                         return 0;
 236                 }
 237                 return CMD_RET_USAGE;
 238
 239         default:
 240                 return CMD_RET_USAGE;
 241         }
 242 }
 243
 244 U_BOOT_CMD(
 245         log,     255,   1,      do_log,
 246         "manipulate logbuffer",
 247         "info   - show pointer details\n"
 248         "log reset  - clear contents\n"
 249         "log show   - show contents\n"
 250         "log append <msg> - append <msg> to the logbuffer"
 251 );
 252
 253 static int logbuff_printk(const char *line)
 254 {
 255         int i;
 256         char *msg, *p, *buf_end;
 257         int line_feed;
 258         static signed char msg_level = -1;
 259
 260         strcpy(buf + 3, line);
 261         i = strlen(line);
 262         buf_end = buf + 3 + i;
 263         for (p = buf + 3; p < buf_end; p++) {
 264                 msg = p;
 265                 if (msg_level < 0) {
 266                         if (
 267                                 p[0] != '<' ||
 268                                 p[1] < '0' ||
 269                                 p[1] > '7' ||
 270                                 p[2] != '>'
 271                         ) {
 272                                 p -= 3;
 273                                 p[0] = '<';
 274                                 p[1] = default_message_loglevel + '0';
 275                                 p[2] = '>';
 276                         } else {
 277                                 msg += 3;
 278                         }
 279                         msg_level = p[1] - '0';
 280                 }
 281                 line_feed = 0;
 282                 for (; p < buf_end; p++) {
 283                         if (log_version == 2) {
 284                                 lbuf[log->v2.end & LOGBUFF_MASK] = *p;
 285                                 log->v2.end++;
 286                                 if (log->v2.end - log->v2.start > LOGBUFF_LEN)
 287                                         log->v2.start++;
 288                                 log->v2.chars++;
 289                         } else {
 290                                 lbuf[(log->v1.start + log->v1.size) &
 291                                          LOGBUFF_MASK] = *p;
 292                                 if (log->v1.size < LOGBUFF_LEN)
 293                                         log->v1.size++;
 294                                 else
 295                                         log->v1.start++;
 296                                 log->v1.chars++;
 297                         }
 298                         if (*p == '\n') {
 299                                 line_feed = 1;
 300                                 break;
 301                         }
 302                 }
 303                 if (msg_level < console_loglevel) {
 304                         printf("%s", msg);
 305                 }
 306                 if (line_feed)
 307                         msg_level = -1;
 308         }
 309         return i;
 310 }