Subversion Repositories openrisc_2011-10-31

/*

 *  RTEMS Task Manager

 *

 *

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  $Id: tasks.c,v 1.2 2001-09-27 11:59:19 chris Exp $

 */

#include <rtems/system.h>

#include <rtems/rtems/status.h>

#include <rtems/rtems/support.h>

#include <rtems/rtems/modes.h>

#include <rtems/score/object.h>

#include <rtems/score/stack.h>

#include <rtems/score/states.h>

#include <rtems/rtems/tasks.h>

#include <rtems/score/thread.h>

#include <rtems/score/threadq.h>

#include <rtems/score/tod.h>

#include <rtems/score/userext.h>

#include <rtems/score/wkspace.h>

#include <rtems/score/apiext.h>

#include <rtems/score/sysstate.h>

/*PAGE

 *

 *  _RTEMS_tasks_Create_extension

 *

 *  This routine is an extension routine that is invoked as part

 *  of creating any type of task or thread in the system.  If the

 *  task is created via another API, then this routine is invoked

 *  and this API given the opportunity to initialize its extension

 *  area.

 */

boolean _RTEMS_tasks_Create_extension(

  Thread_Control *executing,

  Thread_Control *created

)

{

  RTEMS_API_Control *api;

  api = _Workspace_Allocate( sizeof( RTEMS_API_Control ) );

  if ( !api )

    return FALSE;

  created->API_Extensions[ THREAD_API_RTEMS ] = api;

  api->pending_events = EVENT_SETS_NONE_PENDING;

  _ASR_Initialize( &api->Signal );

  created->task_variables = NULL;

  return TRUE;

}

/*PAGE

 *

 *  _RTEMS_tasks_Start_extension

 *

 *  This extension routine is invoked when a task is started for the

 *  first time.

 */

User_extensions_routine _RTEMS_tasks_Start_extension(

  Thread_Control *executing,

  Thread_Control *started

)

{

  RTEMS_API_Control *api;

  api = started->API_Extensions[ THREAD_API_RTEMS ];

  api->pending_events = EVENT_SETS_NONE_PENDING;

  _ASR_Initialize( &api->Signal );

}

/*PAGE

 *

 *  _RTEMS_tasks_Delete_extension

 *

 *  This extension routine is invoked when a task is deleted.

 */

User_extensions_routine _RTEMS_tasks_Delete_extension(

  Thread_Control *executing,

  Thread_Control *deleted

)

{

  rtems_task_variable_t *tvp, *next;

  /*

   *  Free per task variable memory

   */

  tvp = deleted->task_variables;

  deleted->task_variables = NULL;

  while (tvp) {

    next = tvp->next;

    if  (tvp->dtor)

        (*tvp->dtor)( tvp->ptr );

    if (executing == deleted)

        *tvp->ptr = tvp->gval;

    _Workspace_Free( tvp );

    tvp = next;

  }

  /*

   *  Free API specific memory

   */

  (void) _Workspace_Free( deleted->API_Extensions[ THREAD_API_RTEMS ] );

  deleted->API_Extensions[ THREAD_API_RTEMS ] = NULL;

}

/*PAGE

 *

 *  _RTEMS_tasks_Switch_extension

 *

 *  This extension routine is invoked at each context switch.

 */

void _RTEMS_tasks_Switch_extension(

  Thread_Control *executing,

  Thread_Control *heir

)

{

  rtems_task_variable_t *tvp;

  /*

   *  Per Task Variables

   */

  tvp = executing->task_variables;

  while (tvp) {

    tvp->tval = *tvp->ptr;

    *tvp->ptr = tvp->gval;

    tvp = tvp->next;

  }

  tvp = heir->task_variables;

  while (tvp) {

    tvp->gval = *tvp->ptr;

    *tvp->ptr = tvp->tval;

    tvp = tvp->next;

  }

}

/*PAGE

 *

 *  _RTEMS_tasks_Post_switch_extension

 *

 *  This extension routine is invoked at each context switch.

 */

void _RTEMS_tasks_Post_switch_extension(

  Thread_Control *executing

)

{

  ISR_Level          level;

  RTEMS_API_Control *api;

  ASR_Information   *asr;

  rtems_signal_set   signal_set;

  Modes_Control      prev_mode;

  api = executing->API_Extensions[ THREAD_API_RTEMS ];

  /*

   *  Signal Processing

   */

  asr = &api->Signal;

  _ISR_Disable( level );

    signal_set = asr->signals_posted;

    asr->signals_posted = 0;

  _ISR_Enable( level );

  if ( !signal_set ) /* similar to _ASR_Are_signals_pending( asr ) */

    return;

  asr->nest_level += 1;

  rtems_task_mode( asr->mode_set, RTEMS_ALL_MODE_MASKS, &prev_mode );

  (*asr->handler)( signal_set );

  asr->nest_level -= 1;

  rtems_task_mode( prev_mode, RTEMS_ALL_MODE_MASKS, &prev_mode );

}

API_extensions_Control _RTEMS_tasks_API_extensions = {

  { NULL, NULL },

  NULL,                                     /* predriver */

  _RTEMS_tasks_Initialize_user_tasks,       /* postdriver */

  _RTEMS_tasks_Post_switch_extension        /* post switch */

};

User_extensions_Control _RTEMS_tasks_User_extensions = {

  { NULL, NULL },

  { _RTEMS_tasks_Create_extension,            /* create */

    _RTEMS_tasks_Start_extension,             /* start */

    _RTEMS_tasks_Start_extension,             /* restart */

    _RTEMS_tasks_Delete_extension,            /* delete */

    _RTEMS_tasks_Switch_extension,            /* switch */

    NULL,                                     /* begin */

    NULL,                                     /* exitted */

    NULL                                      /* fatal */

  }

};

/*PAGE

 *

 *  _RTEMS_tasks_Manager_initialization

 *

 *  This routine initializes all Task Manager related data structures.

 *

 *  Input parameters:

 *    maximum_tasks       - number of tasks to initialize

 *

 *  Output parameters:  NONE

 */

void _RTEMS_tasks_Manager_initialization(

  unsigned32                        maximum_tasks,

  unsigned32                        number_of_initialization_tasks,

  rtems_initialization_tasks_table *user_tasks

)

{

  _RTEMS_tasks_Number_of_initialization_tasks = number_of_initialization_tasks;

  _RTEMS_tasks_User_initialization_tasks = user_tasks;

  /*

   *  There may not be any RTEMS initialization tasks configured.

   */

#if 0

  if ( user_tasks == NULL || number_of_initialization_tasks == 0 )

    _Internal_error_Occurred( INTERNAL_ERROR_RTEMS_API, TRUE, RTEMS_TOO_MANY );

#endif

  _Objects_Initialize_information(

    &_RTEMS_tasks_Information,

    OBJECTS_RTEMS_TASKS,

    TRUE,

    maximum_tasks,

    sizeof( Thread_Control ),

    FALSE,

    RTEMS_MAXIMUM_NAME_LENGTH,

    TRUE

  );

  /*

   *  Add all the extensions for this API

   */

  _User_extensions_Add_API_set( &_RTEMS_tasks_User_extensions );

  _API_extensions_Add( &_RTEMS_tasks_API_extensions );

  /*

   *  Register the MP Process Packet routine.

   */

#if defined(RTEMS_MULTIPROCESSING)

  _MPCI_Register_packet_processor(

    MP_PACKET_TASKS,

    _RTEMS_tasks_MP_Process_packet

  );

#endif

}