#ifndef __KERNEL_PRINTK__
  #define __KERNEL_PRINTK__

  #include <stdarg.h>

  #include <linux/init.h>

  #include <linux/kern_levels.h>

  #include <linux/linkage.h>

  #include <linux/cache.h>

  extern const char linux_banner[];
  extern const char linux_proc_banner[];

  static inline int printk_get_level(const char *buffer)
  {

  	if (buffer[0] == KERN_SOH_ASCII && buffer[1]) {

  		switch (buffer[1]) {
  		case '0' ... '7':
  		case 'd':	/* KERN_DEFAULT */

  			return buffer[1];
  		}
  	}
  	return 0;
  }
  
  static inline const char *printk_skip_level(const char *buffer)
  {

  	if (printk_get_level(buffer))
  		return buffer + 2;

  	return buffer;
  }

  /* printk's without a loglevel use this.. */

  #define MESSAGE_LOGLEVEL_DEFAULT CONFIG_MESSAGE_LOGLEVEL_DEFAULT

  
  /* We show everything that is MORE important than this.. */
  #define CONSOLE_LOGLEVEL_SILENT  0 /* Mum's the word */
  #define CONSOLE_LOGLEVEL_MIN	 1 /* Minimum loglevel we let people use */
  #define CONSOLE_LOGLEVEL_QUIET	 4 /* Shhh ..., when booted with "quiet" */
  #define CONSOLE_LOGLEVEL_DEFAULT 7 /* anything MORE serious than KERN_DEBUG */
  #define CONSOLE_LOGLEVEL_DEBUG	10 /* issue debug messages */
  #define CONSOLE_LOGLEVEL_MOTORMOUTH 15	/* You can't shut this one up */

  extern int console_printk[];
  
  #define console_loglevel (console_printk[0])
  #define default_message_loglevel (console_printk[1])
  #define minimum_console_loglevel (console_printk[2])
  #define default_console_loglevel (console_printk[3])

  static inline void console_silent(void)
  {

  	console_loglevel = CONSOLE_LOGLEVEL_SILENT;

  }
  
  static inline void console_verbose(void)
  {
  	if (console_loglevel)

  		console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;

  }

  struct va_format {
  	const char *fmt;
  	va_list *va;
  };
  
  /*
   * FW_BUG
   * Add this to a message where you are sure the firmware is buggy or behaves
   * really stupid or out of spec. Be aware that the responsible BIOS developer
   * should be able to fix this issue or at least get a concrete idea of the
   * problem by reading your message without the need of looking at the kernel
   * code.
   *
   * Use it for definite and high priority BIOS bugs.
   *
   * FW_WARN
   * Use it for not that clear (e.g. could the kernel messed up things already?)
   * and medium priority BIOS bugs.
   *
   * FW_INFO
   * Use this one if you want to tell the user or vendor about something
   * suspicious, but generally harmless related to the firmware.
   *
   * Use it for information or very low priority BIOS bugs.
   */
  #define FW_BUG		"[Firmware Bug]: "
  #define FW_WARN		"[Firmware Warn]: "
  #define FW_INFO		"[Firmware Info]: "
  
  /*
   * HW_ERR
   * Add this to a message for hardware errors, so that user can report
   * it to hardware vendor instead of LKML or software vendor.
   */
  #define HW_ERR		"[Hardware Error]: "

  /*

   * DEPRECATED
   * Add this to a message whenever you want to warn user space about the use
   * of a deprecated aspect of an API so they can stop using it
   */
  #define DEPRECATED	"[Deprecated]: "
  
  /*

   * Dummy printk for disabled debugging statements to use whilst maintaining
   * gcc's format and side-effect checking.
   */

  static inline __printf(1, 2)

  int no_printk(const char *fmt, ...)
  {
  	return 0;
  }

  #ifdef CONFIG_EARLY_PRINTK

  extern asmlinkage __printf(1, 2)

  void early_printk(const char *fmt, ...);

  #else
  static inline __printf(1, 2) __cold
  void early_printk(const char *s, ...) { }
  #endif

  typedef int(*printk_func_t)(const char *fmt, va_list args);

  #ifdef CONFIG_PRINTK

  asmlinkage __printf(5, 0)
  int vprintk_emit(int facility, int level,
  		 const char *dict, size_t dictlen,
  		 const char *fmt, va_list args);

  asmlinkage __printf(1, 0)

  int vprintk(const char *fmt, va_list args);

  
  asmlinkage __printf(5, 6) __cold

  int printk_emit(int facility, int level,
  		const char *dict, size_t dictlen,
  		const char *fmt, ...);

  asmlinkage __printf(1, 2) __cold

  int printk(const char *fmt, ...);

  
  /*

   * Special printk facility for scheduler/timekeeping use only, _DO_NOT_USE_ !

   */

  __printf(1, 2) __cold int printk_deferred(const char *fmt, ...);

  
  /*

   * Please don't use printk_ratelimit(), because it shares ratelimiting state
   * with all other unrelated printk_ratelimit() callsites.  Instead use
   * printk_ratelimited() or plain old __ratelimit().
   */
  extern int __printk_ratelimit(const char *func);
  #define printk_ratelimit() __printk_ratelimit(__func__)
  extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
  				   unsigned int interval_msec);
  
  extern int printk_delay_msec;
  extern int dmesg_restrict;

  extern int kptr_restrict;

  extern void wake_up_klogd(void);

  char *log_buf_addr_get(void);
  u32 log_buf_len_get(void);

  void log_buf_kexec_setup(void);

  void __init setup_log_buf(int early);

  void dump_stack_set_arch_desc(const char *fmt, ...);

  void dump_stack_print_info(const char *log_lvl);

  void show_regs_print_info(const char *log_lvl);

  #else

  static inline __printf(1, 0)

  int vprintk(const char *s, va_list args)
  {
  	return 0;
  }

  static inline __printf(1, 2) __cold

  int printk(const char *s, ...)
  {
  	return 0;
  }

  static inline __printf(1, 2) __cold

  int printk_deferred(const char *s, ...)

  {
  	return 0;
  }

  static inline int printk_ratelimit(void)
  {
  	return 0;
  }
  static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
  					  unsigned int interval_msec)
  {
  	return false;
  }

  static inline void wake_up_klogd(void)
  {
  }

  static inline char *log_buf_addr_get(void)
  {
  	return NULL;
  }
  
  static inline u32 log_buf_len_get(void)
  {
  	return 0;
  }

  static inline void log_buf_kexec_setup(void)
  {
  }

  
  static inline void setup_log_buf(int early)
  {
  }

  static inline void dump_stack_set_arch_desc(const char *fmt, ...)
  {
  }

  static inline void dump_stack_print_info(const char *log_lvl)
  {
  }

  
  static inline void show_regs_print_info(const char *log_lvl)
  {
  }

  #endif

  extern asmlinkage void dump_stack(void) __cold;

  #ifndef pr_fmt
  #define pr_fmt(fmt) fmt
  #endif

  /*
   * These can be used to print at the various log levels.
   * All of these will print unconditionally, although note that pr_debug()
   * and other debug macros are compiled out unless either DEBUG is defined
   * or CONFIG_DYNAMIC_DEBUG is set.
   */

  #define pr_emerg(fmt, ...) \

  	printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)

  #define pr_alert(fmt, ...) \

  	printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)

  #define pr_crit(fmt, ...) \

  	printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)

  #define pr_err(fmt, ...) \

  	printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)

  #define pr_warning(fmt, ...) \

  	printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)

  #define pr_warn pr_warning
  #define pr_notice(fmt, ...) \

  	printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)

  #define pr_info(fmt, ...) \

  	printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)

  /*
   * Like KERN_CONT, pr_cont() should only be used when continuing
   * a line with no newline ('
  ') enclosed. Otherwise it defaults
   * back to KERN_DEFAULT.
   */

  #define pr_cont(fmt, ...) \
  	printk(KERN_CONT fmt, ##__VA_ARGS__)
  
  /* pr_devel() should produce zero code unless DEBUG is defined */
  #ifdef DEBUG
  #define pr_devel(fmt, ...) \
  	printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
  #else
  #define pr_devel(fmt, ...) \

  	no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)

  #endif

  #include <linux/dynamic_debug.h>

  /* If you are writing a driver, please use dev_dbg instead */

  #if defined(CONFIG_DYNAMIC_DEBUG)

  /* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
  #define pr_debug(fmt, ...) \
  	dynamic_pr_debug(fmt, ##__VA_ARGS__)

  #elif defined(DEBUG)
  #define pr_debug(fmt, ...) \
  	printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)

  #else
  #define pr_debug(fmt, ...) \

  	no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)

  #endif
  
  /*

   * Print a one-time message (analogous to WARN_ONCE() et al):
   */
  
  #ifdef CONFIG_PRINTK

  #define printk_once(fmt, ...)					\
  ({								\
  	static bool __print_once __read_mostly;			\
  								\
  	if (!__print_once) {					\
  		__print_once = true;				\
  		printk(fmt, ##__VA_ARGS__);			\
  	}							\

  })

  #define printk_deferred_once(fmt, ...)				\
  ({								\
  	static bool __print_once __read_mostly;			\
  								\
  	if (!__print_once) {					\
  		__print_once = true;				\
  		printk_deferred(fmt, ##__VA_ARGS__);		\
  	}							\
  })

  #else

  #define printk_once(fmt, ...)					\

  	no_printk(fmt, ##__VA_ARGS__)

  #define printk_deferred_once(fmt, ...)				\
  	no_printk(fmt, ##__VA_ARGS__)

  #endif
  
  #define pr_emerg_once(fmt, ...)					\
  	printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
  #define pr_alert_once(fmt, ...)					\
  	printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
  #define pr_crit_once(fmt, ...)					\
  	printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
  #define pr_err_once(fmt, ...)					\
  	printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
  #define pr_warn_once(fmt, ...)					\
  	printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
  #define pr_notice_once(fmt, ...)				\
  	printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
  #define pr_info_once(fmt, ...)					\
  	printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
  #define pr_cont_once(fmt, ...)					\
  	printk_once(KERN_CONT pr_fmt(fmt), ##__VA_ARGS__)

  
  #if defined(DEBUG)
  #define pr_devel_once(fmt, ...)					\
  	printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
  #else
  #define pr_devel_once(fmt, ...)					\
  	no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
  #endif

  /* If you are writing a driver, please use dev_dbg instead */
  #if defined(DEBUG)
  #define pr_debug_once(fmt, ...)					\
  	printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
  #else
  #define pr_debug_once(fmt, ...)					\
  	no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
  #endif
  
  /*

   * ratelimited messages with local ratelimit_state,
   * no local ratelimit_state used in the !PRINTK case
   */
  #ifdef CONFIG_PRINTK

  #define printk_ratelimited(fmt, ...)					\
  ({									\

  	static DEFINE_RATELIMIT_STATE(_rs,				\
  				      DEFAULT_RATELIMIT_INTERVAL,	\
  				      DEFAULT_RATELIMIT_BURST);		\
  									\
  	if (__ratelimit(&_rs))						\
  		printk(fmt, ##__VA_ARGS__);				\
  })
  #else

  #define printk_ratelimited(fmt, ...)					\
  	no_printk(fmt, ##__VA_ARGS__)

  #endif

  #define pr_emerg_ratelimited(fmt, ...)					\

  	printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)

  #define pr_alert_ratelimited(fmt, ...)					\

  	printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)

  #define pr_crit_ratelimited(fmt, ...)					\

  	printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)

  #define pr_err_ratelimited(fmt, ...)					\

  	printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)

  #define pr_warn_ratelimited(fmt, ...)					\

  	printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)

  #define pr_notice_ratelimited(fmt, ...)					\

  	printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)

  #define pr_info_ratelimited(fmt, ...)					\

  	printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
  /* no pr_cont_ratelimited, don't do that... */

  
  #if defined(DEBUG)
  #define pr_devel_ratelimited(fmt, ...)					\
  	printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
  #else
  #define pr_devel_ratelimited(fmt, ...)					\
  	no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
  #endif

  /* If you are writing a driver, please use dev_dbg instead */

  #if defined(CONFIG_DYNAMIC_DEBUG)
  /* descriptor check is first to prevent flooding with "callbacks suppressed" */
  #define pr_debug_ratelimited(fmt, ...)					\
  do {									\
  	static DEFINE_RATELIMIT_STATE(_rs,				\
  				      DEFAULT_RATELIMIT_INTERVAL,	\
  				      DEFAULT_RATELIMIT_BURST);		\
  	DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);			\
  	if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) &&	\
  	    __ratelimit(&_rs))						\
  		__dynamic_pr_debug(&descriptor, fmt, ##__VA_ARGS__);	\
  } while (0)
  #elif defined(DEBUG)

  #define pr_debug_ratelimited(fmt, ...)					\

  	printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
  #else
  #define pr_debug_ratelimited(fmt, ...) \

  	no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)

  #endif

  extern const struct file_operations kmsg_fops;

  enum {
  	DUMP_PREFIX_NONE,
  	DUMP_PREFIX_ADDRESS,
  	DUMP_PREFIX_OFFSET
  };

  extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
  			      int groupsize, char *linebuf, size_t linebuflen,
  			      bool ascii);

  #ifdef CONFIG_PRINTK
  extern void print_hex_dump(const char *level, const char *prefix_str,
  			   int prefix_type, int rowsize, int groupsize,
  			   const void *buf, size_t len, bool ascii);

  #if defined(CONFIG_DYNAMIC_DEBUG)
  #define print_hex_dump_bytes(prefix_str, prefix_type, buf, len)	\
  	dynamic_hex_dump(prefix_str, prefix_type, 16, 1, buf, len, true)
  #else

  extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
  				 const void *buf, size_t len);

  #endif /* defined(CONFIG_DYNAMIC_DEBUG) */

  #else
  static inline void print_hex_dump(const char *level, const char *prefix_str,
  				  int prefix_type, int rowsize, int groupsize,
  				  const void *buf, size_t len, bool ascii)
  {
  }
  static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
  					const void *buf, size_t len)
  {
  }
  
  #endif

  #if defined(CONFIG_DYNAMIC_DEBUG)
  #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,	\
  			     groupsize, buf, len, ascii)	\
  	dynamic_hex_dump(prefix_str, prefix_type, rowsize,	\
  			 groupsize, buf, len, ascii)
  #else
  #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,		\
  			     groupsize, buf, len, ascii)		\
  	print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize,	\
  		       groupsize, buf, len, ascii)
  #endif /* defined(CONFIG_DYNAMIC_DEBUG) */

  #endif