include/logbuff.h

   1 /*
   2  * (C) Copyright 2002-2007
   3  * Detlev Zundel, 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 #ifndef _LOGBUFF_H
  24 #define _LOGBUFF_H
  25
  26 #ifdef CONFIG_LOGBUFFER
  27
  28 #define LOGBUFF_MAGIC   0xc0de4ced      /* Forced by code, eh!  */
  29 #define LOGBUFF_LEN     (16384) /* Must be 16k right now */
  30 #define LOGBUFF_MASK    (LOGBUFF_LEN-1)
  31 #define LOGBUFF_OVERHEAD (4096) /* Logbuffer overhead for extra info */
  32 #define LOGBUFF_RESERVE (LOGBUFF_LEN+LOGBUFF_OVERHEAD)
  33
  34 #define LOGBUFF_INITIALIZED     (1<<31)
  35
  36 /* The mapping used here has to be the same as in setup_ext_logbuff ()
  37    in linux/kernel/printk */
  38
  39 typedef struct {
  40         union {
  41                 struct {
  42                         unsigned long   tag;
  43                         unsigned long   start;
  44                         unsigned long   con;
  45                         unsigned long   end;
  46                         unsigned long   chars;
  47                 } v2;
  48                 struct {
  49                         unsigned long   dummy;
  50                         unsigned long   tag;
  51                         unsigned long   start;
  52                         unsigned long   size;
  53                         unsigned long   chars;
  54                 } v1;
  55         };
  56         unsigned char   buf[0];
  57 } logbuff_t;
  58
  59 int drv_logbuff_init (void);
  60 void logbuff_init_ptrs (void);
  61 void logbuff_log(char *msg);
  62 void logbuff_reset (void);
  63
  64 #endif /* CONFIG_LOGBUFFER */
  65
  66 #endif /* _LOGBUFF_H */