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 /* The mapping used here has to be the same as in setup_ext_logbuff ()
  35    in linux/kernel/printk */
  36
  37 typedef struct {
  38         union {
  39                 struct {
  40                         unsigned long   tag;
  41                         unsigned long   start;
  42                         unsigned long   con;
  43                         unsigned long   end;
  44                         unsigned long   chars;
  45                 } v2;
  46                 struct {
  47                         unsigned long   dummy;
  48                         unsigned long   tag;
  49                         unsigned long   start;
  50                         unsigned long   size;
  51                         unsigned long   chars;
  52                 } v1;
  53         };
  54         unsigned char   buf[0];
  55 } logbuff_t;
  56
  57 int drv_logbuff_init (void);
  58 void logbuff_init_ptrs (void);
  59 void logbuff_log(char *msg);
  60 void logbuff_reset (void);
  61 unsigned long logbuffer_base (void);
  62
  63 #endif /* CONFIG_LOGBUFFER */
  64
  65 #endif /* _LOGBUFF_H */