common/cmd_log.c

   1 /*
   2  * (C) Copyright 2002
   3  * Detlev Zundel, DENX Software Engineering, dzu@denx.de.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 /*
  25  * Logbuffer handling routines
  26  */
  27
  28 #include <common.h>
  29 #include <command.h>
  30 #include <devices.h>
  31 #include <logbuff.h>
  32
  33 #if defined(CONFIG_LOGBUFFER)
  34
  35 #define LOG_BUF_LEN     (16384)
  36 #define LOG_BUF_MASK    (LOG_BUF_LEN-1)
  37
  38 /* Local prototypes */
  39 static void logbuff_putc (const char c);
  40 static void logbuff_puts (const char *s);
  41 static int logbuff_printk(const char *line);
  42
  43 static char buf[1024];
  44
  45 static unsigned console_loglevel = 3;
  46 static unsigned default_message_loglevel = 4;
  47 static unsigned long log_size;
  48 static unsigned char *log_buf=NULL;
  49 static unsigned long *ext_log_start, *ext_logged_chars;
  50 #define log_start (*ext_log_start)
  51 #define logged_chars (*ext_logged_chars)
  52
  53 /* Forced by code, eh! */
  54 #define LOGBUFF_MAGIC 0xc0de4ced
  55
  56 int drv_logbuff_init (void)
  57 {
  58         device_t logdev;
  59         int rc;
  60
  61         /* Device initialization */
  62         memset (&logdev, 0, sizeof (logdev));
  63
  64         strcpy (logdev.name, "logbuff");
  65         logdev.ext   = 0;                       /* No extensions */
  66         logdev.flags = DEV_FLAGS_OUTPUT;        /* Output only */
  67         logdev.putc  = logbuff_putc;            /* 'putc' function */
  68         logdev.puts  = logbuff_puts;            /* 'puts' function */
  69
  70         rc = device_register (&logdev);
  71
  72         return (rc == 0) ? 1 : rc;
  73 }
  74
  75 static void logbuff_putc (const char c)
  76 {
  77         char buf[2];
  78         buf[0]=c;
  79         buf[1]='\0';
  80         logbuff_printk(buf);
  81 }
  82
  83 static void logbuff_puts (const char *s)
  84 {
  85         char buf[512];
  86
  87         sprintf(buf, "%s\n", s);
  88         logbuff_printk(buf);
  89 }
  90
  91 void logbuff_log(char *msg)
  92 {
  93         DECLARE_GLOBAL_DATA_PTR;
  94
  95         if (gd->flags & GD_FLG_RELOC) {
  96                 logbuff_printk(msg);
  97         } else {
  98                 puts(msg);
  99         }
 100 }
 101
 102 void logbuff_reset (void)
 103 {
 104         char *s;
 105         unsigned long *ext_tag;
 106
 107         if ((s = getenv ("logstart")) != NULL) {
 108                 log_buf = (unsigned char *)simple_strtoul(s, NULL, 16);
 109                 ext_tag=(unsigned long *)(log_buf)-3;
 110                 ext_log_start=(unsigned long *)(log_buf)-2;
 111                 ext_logged_chars=(unsigned long *)(log_buf)-1;
 112 //              if (*ext_tag!=LOGBUFF_MAGIC) {
 113                         logged_chars=log_start=0;
 114                         *ext_tag=LOGBUFF_MAGIC;
 115 //              }
 116                 log_size=logged_chars;
 117         }
 118 }
 119
 120 /*
 121  * Subroutine:  do_log
 122  *
 123  * Description: Handler for 'log' command..
 124  *
 125  * Inputs:      argv[1] contains the subcommand
 126  *
 127  * Return:      None
 128  *
 129  */
 130 int do_log (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 131 {
 132         char *s;
 133         unsigned long i;
 134
 135         if (log_buf==NULL) {
 136                 printf ("No logbuffer defined!  Set 'logstart' to use this feature.\n");
 137                 return 1;
 138         }
 139
 140         switch (argc) {
 141
 142         case 2:
 143                 if (strcmp(argv[1],"show") == 0) {
 144                         for (i=0; i<logged_chars; i++) {
 145                                 s=log_buf+((log_start+i)&LOG_BUF_MASK);
 146                                 putc(*s);
 147                         }
 148                         return 0;
 149                 } else if (strcmp(argv[1],"reset") == 0) {
 150                         log_start=0;
 151                         logged_chars=0;
 152                         log_size=0;
 153                         return 0;
 154                 }
 155                 printf ("Usage:\n%s\n", cmdtp->usage);
 156                 return 1;
 157
 158         case 3:
 159                 if (strcmp(argv[1],"append") == 0) {
 160                         logbuff_puts(argv[2]);
 161                         return 0;
 162
 163                 }
 164                 printf ("Usage:\n%s\n", cmdtp->usage);
 165                 return 1;
 166
 167         default:
 168                 printf ("Usage:\n%s\n", cmdtp->usage);
 169                 return 1;
 170         }
 171 }
 172
 173 static int logbuff_printk(const char *line)
 174 {
 175         int i;
 176         char *msg, *p, *buf_end;
 177         int line_feed;
 178         static signed char msg_level = -1;
 179
 180         strcpy(buf + 3, line);
 181         i = strlen(line);
 182         buf_end = buf + 3 + i;
 183         for (p = buf + 3; p < buf_end; p++) {
 184                 msg = p;
 185                 if (msg_level < 0) {
 186                         if (
 187                                 p[0] != '<' ||
 188                                 p[1] < '0' ||
 189                                 p[1] > '7' ||
 190                                 p[2] != '>'
 191                         ) {
 192                                 p -= 3;
 193                                 p[0] = '<';
 194                                 p[1] = default_message_loglevel + '0';
 195                                 p[2] = '>';
 196                         } else
 197                                 msg += 3;
 198                         msg_level = p[1] - '0';
 199                 }
 200                 line_feed = 0;
 201                 for (; p < buf_end; p++) {
 202                         log_buf[(log_start+log_size) & LOG_BUF_MASK] = *p;
 203                         if (log_size < LOG_BUF_LEN)
 204                                 log_size++;
 205                         else
 206                                 log_start++;
 207
 208                         logged_chars++;
 209                         if (*p == '\n') {
 210                                 line_feed = 1;
 211                                 break;
 212                         }
 213                 }
 214                 if (msg_level < console_loglevel) {
 215                         printf("%s", msg);
 216                 }
 217                 if (line_feed)
 218                         msg_level = -1;
 219         }
 220         return i;
 221 }
 222
 223 #endif /* (CONFIG_LOGBUFFER) */