#ifndef _KDB_H
  #define _KDB_H
  
  /*
   * Kernel Debugger Architecture Independent Global Headers
   *
   * This file is subject to the terms and conditions of the GNU General Public
   * License.  See the file "COPYING" in the main directory of this archive
   * for more details.
   *
   * Copyright (c) 2000-2007 Silicon Graphics, Inc.  All Rights Reserved.
   * Copyright (C) 2000 Stephane Eranian <eranian@hpl.hp.com>
   * Copyright (C) 2009 Jason Wessel <jason.wessel@windriver.com>
   */
  
  #ifdef	CONFIG_KGDB_KDB
  #include <linux/init.h>
  #include <linux/sched.h>
  #include <asm/atomic.h>
  
  #define KDB_POLL_FUNC_MAX	5

  extern int kdb_poll_idx;

  
  /*
   * kdb_initial_cpu is initialized to -1, and is set to the cpu
   * number whenever the kernel debugger is entered.
   */
  extern int kdb_initial_cpu;
  extern atomic_t kdb_event;

  /* Types and messages used for dynamically added kdb shell commands */
  
  #define KDB_MAXARGS    16 /* Maximum number of arguments to a function  */
  
  typedef enum {
  	KDB_REPEAT_NONE = 0,	/* Do not repeat this command */
  	KDB_REPEAT_NO_ARGS,	/* Repeat the command without arguments */
  	KDB_REPEAT_WITH_ARGS,	/* Repeat the command including its arguments */
  } kdb_repeat_t;
  
  typedef int (*kdb_func_t)(int, const char **);
  
  /* KDB return codes from a command or internal kdb function */
  #define KDB_NOTFOUND	(-1)
  #define KDB_ARGCOUNT	(-2)
  #define KDB_BADWIDTH	(-3)
  #define KDB_BADRADIX	(-4)
  #define KDB_NOTENV	(-5)
  #define KDB_NOENVVALUE	(-6)
  #define KDB_NOTIMP	(-7)
  #define KDB_ENVFULL	(-8)
  #define KDB_ENVBUFFULL	(-9)
  #define KDB_TOOMANYBPT	(-10)
  #define KDB_TOOMANYDBREGS (-11)
  #define KDB_DUPBPT	(-12)
  #define KDB_BPTNOTFOUND	(-13)
  #define KDB_BADMODE	(-14)
  #define KDB_BADINT	(-15)
  #define KDB_INVADDRFMT  (-16)
  #define KDB_BADREG      (-17)
  #define KDB_BADCPUNUM   (-18)
  #define KDB_BADLENGTH	(-19)
  #define KDB_NOBP	(-20)
  #define KDB_BADADDR	(-21)

  /*
   * kdb_diemsg
   *
   *	Contains a pointer to the last string supplied to the
   *	kernel 'die' panic function.
   */
  extern const char *kdb_diemsg;
  
  #define KDB_FLAG_EARLYKDB	(1 << 0) /* set from boot parameter kdb=early */
  #define KDB_FLAG_CATASTROPHIC	(1 << 1) /* A catastrophic event has occurred */
  #define KDB_FLAG_CMD_INTERRUPT	(1 << 2) /* Previous command was interrupted */
  #define KDB_FLAG_NOIPI		(1 << 3) /* Do not send IPIs */
  #define KDB_FLAG_ONLY_DO_DUMP	(1 << 4) /* Only do a dump, used when
  					  * kdb is off */
  #define KDB_FLAG_NO_CONSOLE	(1 << 5) /* No console is available,
  					  * kdb is disabled */
  #define KDB_FLAG_NO_VT_CONSOLE	(1 << 6) /* No VT console is available, do
  					  * not use keyboard */
  #define KDB_FLAG_NO_I8042	(1 << 7) /* No i8042 chip is available, do
  					  * not use keyboard */
  
  extern int kdb_flags;	/* Global flags, see kdb_state for per cpu state */
  
  extern void kdb_save_flags(void);
  extern void kdb_restore_flags(void);
  
  #define KDB_FLAG(flag)		(kdb_flags & KDB_FLAG_##flag)
  #define KDB_FLAG_SET(flag)	((void)(kdb_flags |= KDB_FLAG_##flag))
  #define KDB_FLAG_CLEAR(flag)	((void)(kdb_flags &= ~KDB_FLAG_##flag))
  
  /*
   * External entry point for the kernel debugger.  The pt_regs
   * at the time of entry are supplied along with the reason for
   * entry to the kernel debugger.
   */
  
  typedef enum {
  	KDB_REASON_ENTER = 1,	/* KDB_ENTER() trap/fault - regs valid */
  	KDB_REASON_ENTER_SLAVE,	/* KDB_ENTER_SLAVE() trap/fault - regs valid */
  	KDB_REASON_BREAK,	/* Breakpoint inst. - regs valid */
  	KDB_REASON_DEBUG,	/* Debug Fault - regs valid */
  	KDB_REASON_OOPS,	/* Kernel Oops - regs valid */
  	KDB_REASON_SWITCH,	/* CPU switch - regs valid*/
  	KDB_REASON_KEYBOARD,	/* Keyboard entry - regs valid */
  	KDB_REASON_NMI,		/* Non-maskable interrupt; regs valid */
  	KDB_REASON_RECURSE,	/* Recursive entry to kdb;
  				 * regs probably valid */
  	KDB_REASON_SSTEP,	/* Single Step trap. - regs valid */
  } kdb_reason_t;

  extern int kdb_trap_printk;
  extern int vkdb_printf(const char *fmt, va_list args)
  	    __attribute__ ((format (printf, 1, 0)));

  extern int kdb_printf(const char *, ...)
  	    __attribute__ ((format (printf, 1, 2)));
  typedef int (*kdb_printf_t)(const char *, ...)
  	     __attribute__ ((format (printf, 1, 2)));
  
  extern void kdb_init(int level);
  
  /* Access to kdb specific polling devices */
  typedef int (*get_char_func)(void);
  extern get_char_func kdb_poll_funcs[];
  extern int kdb_get_kbd_char(void);
  
  static inline
  int kdb_process_cpu(const struct task_struct *p)
  {
  	unsigned int cpu = task_thread_info(p)->cpu;
  	if (cpu > num_possible_cpus())
  		cpu = 0;
  	return cpu;
  }
  
  /* kdb access to register set for stack dumping */
  extern struct pt_regs *kdb_current_regs;

  #ifdef CONFIG_KALLSYMS
  extern const char *kdb_walk_kallsyms(loff_t *pos);
  #else /* ! CONFIG_KALLSYMS */
  static inline const char *kdb_walk_kallsyms(loff_t *pos)
  {
  	return NULL;
  }
  #endif /* ! CONFIG_KALLSYMS */

  /* Dynamic kdb shell command registration */
  extern int kdb_register(char *, kdb_func_t, char *, char *, short);
  extern int kdb_register_repeat(char *, kdb_func_t, char *, char *,
  			       short, kdb_repeat_t);
  extern int kdb_unregister(char *);

  #else /* ! CONFIG_KGDB_KDB */
  #define kdb_printf(...)
  #define kdb_init(x)

  #define kdb_register(...)
  #define kdb_register_repeat(...)
  #define kdb_uregister(x)

  #endif	/* CONFIG_KGDB_KDB */
  enum {
  	KDB_NOT_INITIALIZED,
  	KDB_INIT_EARLY,
  	KDB_INIT_FULL,
  };

  
  extern int kdbgetintenv(const char *, int *);
  extern int kdb_set(int, const char **);

  #endif	/* !_KDB_H */