include/logbuff.h

   1 /*
   2  * (C) Copyright 2002-2007
   3  * Detlev Zundel, dzu@denx.de.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7 #ifndef _LOGBUFF_H
   8 #define _LOGBUFF_H
   9
  10 #ifdef CONFIG_LOGBUFFER
  11
  12 #define LOGBUFF_MAGIC   0xc0de4ced      /* Forced by code, eh!  */
  13 #define LOGBUFF_LEN     (16384) /* Must be 16k right now */
  14 #define LOGBUFF_MASK    (LOGBUFF_LEN-1)
  15 #define LOGBUFF_OVERHEAD (4096) /* Logbuffer overhead for extra info */
  16 #define LOGBUFF_RESERVE (LOGBUFF_LEN+LOGBUFF_OVERHEAD)
  17
  18 /* The mapping used here has to be the same as in setup_ext_logbuff ()
  19    in linux/kernel/printk */
  20
  21 typedef struct {
  22         union {
  23                 struct {
  24                         unsigned long   tag;
  25                         unsigned long   start;
  26                         unsigned long   con;
  27                         unsigned long   end;
  28                         unsigned long   chars;
  29                 } v2;
  30                 struct {
  31                         unsigned long   dummy;
  32                         unsigned long   tag;
  33                         unsigned long   start;
  34                         unsigned long   size;
  35                         unsigned long   chars;
  36                 } v1;
  37         };
  38         unsigned char   buf[0];
  39 } logbuff_t;
  40
  41 int drv_logbuff_init (void);
  42 void logbuff_init_ptrs (void);
  43 void logbuff_log(char *msg);
  44 void logbuff_reset (void);
  45 unsigned long logbuffer_base (void);
  46
  47 #endif /* CONFIG_LOGBUFFER */
  48
  49 #endif /* _LOGBUFF_H */