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/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
                 2011,2012,2013 Giovanni Di Sirio.

    This file is part of ChibiOS/RT.

    ChibiOS/RT is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    ChibiOS/RT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/**
 * @file    chglobal.h
 * @brief   Data structures with global scope header.
 *
 * @addtogroup global
 */

#ifndef _CHGLOBAL_H_
#define _CHGLOBAL_H_

/*===========================================================================*/
/* Module constants.                                                         */
/*===========================================================================*/

/*===========================================================================*/
/* Module pre-compile time settings.                                         */
/*===========================================================================*/

/*===========================================================================*/
/* Derived constants and error checks.                                       */
/*===========================================================================*/

/*===========================================================================*/
/* Module data structures and types.                                         */
/*===========================================================================*/

/**
 * @brief   Generic threads single link list, it works like a stack.
 */
typedef struct {
  thread_t              *p_next;    /**< @brief Next in the list/queue.     */
} threads_list_t;

/**
 * @extends threads_list_t
 *
 * @brief   Generic threads bidirectional linked list header and element.
 */
typedef struct {
  thread_t              *p_next;    /**< @brief Next in the list/queue.     */
  thread_t              *p_prev;    /**< @brief Previous in the queue.      */
} threads_queue_t;

/**
 * @extends threads_queue_t
 *
 * @brief   Ready list header.
 */
typedef struct {
  threads_queue_t       r_queue;    /**< @brief Threads queue.              */
  tprio_t               r_prio;     /**< @brief This field must be
                                                initialized to zero.        */
  struct context        r_ctx;      /**< @brief Not used, present because
                                                offsets.                    */
#if CH_CFG_USE_REGISTRY || defined(__DOXYGEN__)
  thread_t              *r_newer;   /**< @brief Newer registry element.     */
  thread_t              *r_older;   /**< @brief Older registry element.     */
#endif
  /* End of the fields shared with the thread_t structure.*/
  thread_t              *r_current; /**< @brief The currently running
                                                thread.                     */
} ready_list_t;

/**
 * @extends threads_queue_t
 *
 * @brief   Structure representing a thread.
 * @note    Not all the listed fields are always needed, by switching off some
 *          not needed ChibiOS/RT subsystems it is possible to save RAM space
 *          by shrinking the @p thread_t structure.
 */
typedef struct thread {
  thread_t              *p_next;    /**< @brief Next in the list/queue.     */
  /* End of the fields shared with the threads_list_t structure.*/
  thread_t              *p_prev;    /**< @brief Previous in the queue.      */
  /* End of the fields shared with the threads_queue_t structure.*/
  tprio_t               p_prio;     /**< @brief Thread priority.            */
  struct context        p_ctx;      /**< @brief Processor context.          */
#if CH_CFG_USE_REGISTRY || defined(__DOXYGEN__)
  thread_t              *p_newer;   /**< @brief Newer registry element.     */
  thread_t              *p_older;   /**< @brief Older registry element.     */
#endif
  /* End of the fields shared with the ReadyList structure. */
#if CH_CFG_USE_REGISTRY || defined(__DOXYGEN__)
  /**
   * @brief Thread name or @p NULL.
   */
  const char            *p_name;
#endif
#if CH_DBG_ENABLE_STACK_CHECK || defined(__DOXYGEN__)
  /**
   * @brief Thread stack boundary.
   */
  stkalign_t            *p_stklimit;
#endif
  /**
   * @brief Current thread state.
   */
  tstate_t              p_state;
  /**
   * @brief Various thread flags.
   */
  tmode_t               p_flags;
#if CH_CFG_USE_DYNAMIC || defined(__DOXYGEN__)
  /**
   * @brief References to this thread.
   */
  trefs_t               p_refs;
#endif
  /**
   * @brief Number of ticks remaining to this thread.
   */
#if (CH_CFG_TIME_QUANTUM > 0) || defined(__DOXYGEN__)
  tslices_t             p_preempt;
#endif
#if CH_DBG_THREADS_PROFILING || defined(__DOXYGEN__)
  /**
   * @brief Thread consumed time in ticks.
   * @note  This field can overflow.
   */
  volatile systime_t    p_time;
#endif
  /**
   * @brief State-specific fields.
   * @note  All the fields declared in this union are only valid in the
   *        specified state or condition and are thus volatile.
   */
  union {
    /**
     * @brief Thread wakeup code.
     * @note  This field contains the low level message sent to the thread
     *        by the waking thread or interrupt handler. The value is valid
     *        after exiting the @p chSchWakeupS() function.
     */
    msg_t               rdymsg;
    /**
     * @brief Thread exit code.
     * @note  The thread termination code is stored in this field in order
     *        to be retrieved by the thread performing a @p chThdWait() on
     *        this thread.
     */
    msg_t               exitcode;
    /**
     * @brief Pointer to a generic "wait" object.
     * @note  This field is used to get a generic pointer to a synchronization
     *        object and is valid when the thread is in one of the wait
     *        states.
     */
    void                *wtobjp;
#if CH_CFG_USE_EVENTS || defined(__DOXYGEN__)
    /**
     * @brief Enabled events mask.
     * @note  This field is only valid while the thread is in the
     *        @p CH_STATE_WTOREVT or @p CH_STATE_WTANDEVT states.
     */
    eventmask_t         ewmask;
#endif
  }                     p_u;
#if CH_CFG_USE_WAITEXIT || defined(__DOXYGEN__)
  /**
   * @brief Termination waiting list.
   */
  threads_list_t        p_waiting;
#endif
#if CH_CFG_USE_MESSAGES || defined(__DOXYGEN__)
  /**
   * @brief Messages queue.
   */
  threads_queue_t       p_msgqueue;
  /**
   * @brief Thread message.
   */
  msg_t                 p_msg;
#endif
#if CH_CFG_USE_EVENTS || defined(__DOXYGEN__)
  /**
   * @brief Pending events mask.
   */
  eventmask_t           p_epending;
#endif
#if CH_CFG_USE_MUTEXES || defined(__DOXYGEN__)
  /**
   * @brief List of the mutexes owned by this thread.
   * @note  The list is terminated by a @p NULL in this field.
   */
  struct mutex          *p_mtxlist;
  /**
   * @brief Thread's own, non-inherited, priority.
   */
  tprio_t               p_realprio;
#endif
#if (CH_CFG_USE_DYNAMIC && CH_CFG_USE_MEMPOOLS) || defined(__DOXYGEN__)
  /**
   * @brief Memory Pool where the thread workspace is returned.
   */
  void                  *p_mpool;
#endif
#if CH_DBG_STATISTICS || defined(__DOXYGEN__)
  time_measurement_t    p_stats;
#endif
#if defined(CH_CFG_THREAD_EXTRA_FIELDS)
  /* Extra fields defined in chconf.h.*/
  CH_CFG_THREAD_EXTRA_FIELDS
#endif
} thread_t;

/**
 * @brief   Virtual timers list header.
 * @note    The timers list is implemented as a double link bidirectional list
 *          in order to make the unlink time constant, the reset of a virtual
 *          timer is often used in the code.
 */
typedef struct {
  virtual_timer_t       *vt_next;   /**< @brief Next timer in the delta
                                                list.                       */
  virtual_timer_t       *vt_prev;   /**< @brief Last timer in the delta
                                                list.                       */
  systime_t             vt_delta;   /**< @brief Must be initialized to -1.  */
#if CH_CFG_ST_TIMEDELTA == 0 || defined(__DOXYGEN__)
  volatile systime_t    vt_systime; /**< @brief System Time counter.        */
#endif
#if CH_CFG_ST_TIMEDELTA > 0 || defined(__DOXYGEN__)
  /**
   * @brief   System time of the last tick event.
   */
  systime_t             vt_lasttime;/**< @brief System time of the last
                                                tick event.                 */
#endif
} virtual_timers_list_t;

/**
 * @brief   System data structure.
 * @note    This structure contain all the data areas used by the OS except
 *          stacks.
 */
typedef struct ch_system {
  /**
   * @brief   Ready list header.
   */
  ready_list_t          rlist;
  /**
   * @brief   Virtual timers delta list header.
   */
  virtual_timers_list_t vtlist;
#if CH_CFG_USE_TM || defined(__DOXYGEN__)
  /**
   * @brief   Measurement calibration value.
   */
  rtcnt_t               measurement_offset;
#endif
#if CH_DBG_STATISTICS || defined(__DOXYGEN__)
  /**
   * @brief   Global kernel statistics.
   */
  kernel_stats_t        kernel_stats;
#endif
#if CH_DBG_ENABLED || defined(__DOXYGEN__)
  /**
   * @brief   Pointer to the panic message.
   * @details This pointer is meant to be accessed through the debugger, it is
   *          written once and then the system is halted.
   */
  const char            *dbg_panic_msg;
#endif
#if CH_DBG_SYSTEM_STATE_CHECK || defined(__DOXYGEN__)
  /**
   * @brief   ISR nesting level.
   */
  cnt_t                 dbg_isr_cnt;
  /**
   * @brief   Lock nesting level.
   */
  cnt_t                 dbg_lock_cnt;
#endif
#if CH_DBG_ENABLE_TRACE || defined(__DOXYGEN__)
  /**
   * @brief   Public trace buffer.
   */
  ch_trace_buffer_t     dbg_trace_buffer;
#endif
} ch_system_t;

/*===========================================================================*/
/* Module macros.                                                            */
/*===========================================================================*/

/*===========================================================================*/
/* External declarations.                                                    */
/*===========================================================================*/

#if !defined(__DOXYGEN__)
extern ch_system_t ch;
#endif

/*===========================================================================*/
/* Module inline functions.                                                  */
/*===========================================================================*/

#endif /* _CHGLOBAL_H_ */

/** @} */