#ifndef _LINUX_HW_BREAKPOINT_H
  #define _LINUX_HW_BREAKPOINT_H

  enum {
  	HW_BREAKPOINT_LEN_1 = 1,
  	HW_BREAKPOINT_LEN_2 = 2,
  	HW_BREAKPOINT_LEN_4 = 4,
  	HW_BREAKPOINT_LEN_8 = 8,

  };

  enum {

  	HW_BREAKPOINT_EMPTY	= 0,
  	HW_BREAKPOINT_R		= 1,
  	HW_BREAKPOINT_W		= 2,
  	HW_BREAKPOINT_RW	= HW_BREAKPOINT_R | HW_BREAKPOINT_W,
  	HW_BREAKPOINT_X		= 4,
  	HW_BREAKPOINT_INVALID   = HW_BREAKPOINT_RW | HW_BREAKPOINT_X,

  };

  enum bp_type_idx {
  	TYPE_INST 	= 0,
  #ifdef CONFIG_HAVE_MIXED_BREAKPOINTS_REGS
  	TYPE_DATA	= 0,
  #else
  	TYPE_DATA	= 1,
  #endif
  	TYPE_MAX
  };

  #ifdef __KERNEL__

  #include <linux/perf_event.h>

  #ifdef CONFIG_HAVE_HW_BREAKPOINT

  extern int __init init_hw_breakpoint(void);

  static inline void hw_breakpoint_init(struct perf_event_attr *attr)
  {

  	memset(attr, 0, sizeof(*attr));

  	attr->type = PERF_TYPE_BREAKPOINT;
  	attr->size = sizeof(*attr);

  	/*
  	 * As it's for in-kernel or ptrace use, we want it to be pinned
  	 * and to call its callback every hits.
  	 */

  	attr->pinned = 1;

  	attr->sample_period = 1;

  }
  
  static inline void ptrace_breakpoint_init(struct perf_event_attr *attr)
  {
  	hw_breakpoint_init(attr);
  	attr->exclude_kernel = 1;

  }

  static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
  {
  	return bp->attr.bp_addr;
  }
  
  static inline int hw_breakpoint_type(struct perf_event *bp)
  {
  	return bp->attr.bp_type;
  }

  static inline unsigned long hw_breakpoint_len(struct perf_event *bp)

  {
  	return bp->attr.bp_len;
  }

  extern struct perf_event *

  register_user_hw_breakpoint(struct perf_event_attr *attr,

  			    perf_overflow_handler_t triggered,

  			    void *context,

  			    struct task_struct *tsk);

  
  /* FIXME: only change from the attr, and don't unregister */

  extern int

  modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr);

  /*
   * Kernel breakpoints are not associated with any particular thread.
   */

  extern struct perf_event *

  register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,

  				perf_overflow_handler_t	triggered,

  				void *context,

  				int cpu);

  extern struct perf_event * __percpu *

  register_wide_hw_breakpoint(struct perf_event_attr *attr,

  			    perf_overflow_handler_t triggered,
  			    void *context);

  
  extern int register_perf_hw_breakpoint(struct perf_event *bp);
  extern int __register_perf_hw_breakpoint(struct perf_event *bp);
  extern void unregister_hw_breakpoint(struct perf_event *bp);

  extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events);

  extern int dbg_reserve_bp_slot(struct perf_event *bp);
  extern int dbg_release_bp_slot(struct perf_event *bp);

  extern int reserve_bp_slot(struct perf_event *bp);
  extern void release_bp_slot(struct perf_event *bp);
  
  extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);

  static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
  {
  	return &bp->hw.info;
  }

  #else /* !CONFIG_HAVE_HW_BREAKPOINT */

  static inline int __init init_hw_breakpoint(void) { return 0; }

  static inline struct perf_event *

  register_user_hw_breakpoint(struct perf_event_attr *attr,

  			    perf_overflow_handler_t triggered,

  			    void *context,

  			    struct task_struct *tsk)	{ return NULL; }

  static inline int

  modify_user_hw_breakpoint(struct perf_event *bp,

  			  struct perf_event_attr *attr)	{ return -ENOSYS; }

  static inline struct perf_event *

  register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,

  				perf_overflow_handler_t	 triggered,

  				void *context,

  				int cpu)		{ return NULL; }

  static inline struct perf_event * __percpu *

  register_wide_hw_breakpoint(struct perf_event_attr *attr,

  			    perf_overflow_handler_t triggered,
  			    void *context)		{ return NULL; }

  static inline int
  register_perf_hw_breakpoint(struct perf_event *bp)	{ return -ENOSYS; }
  static inline int
  __register_perf_hw_breakpoint(struct perf_event *bp) 	{ return -ENOSYS; }
  static inline void unregister_hw_breakpoint(struct perf_event *bp)	{ }
  static inline void

  unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events)	{ }

  static inline int
  reserve_bp_slot(struct perf_event *bp)			{return -ENOSYS; }
  static inline void release_bp_slot(struct perf_event *bp) 		{ }
  
  static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk)	{ }

  static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
  {
  	return NULL;
  }

  #endif /* CONFIG_HAVE_HW_BREAKPOINT */

  #endif /* __KERNEL__ */

  #endif /* _LINUX_HW_BREAKPOINT_H */