/**
 * @file
 *
 * @brief Extend Set of Objects
 * @ingroup ScoreObject
 */

/*
 *  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.rtems.org/license/LICENSE.
 */

#if HAVE_CONFIG_H
#include "config.h"
#endif

#include <rtems/score/objectimpl.h>
#include <rtems/score/address.h>
#include <rtems/score/assert.h>
#include <rtems/score/chainimpl.h>
#include <rtems/score/isrlevel.h>
#include <rtems/score/sysstate.h>
#include <rtems/score/wkspace.h>

#include <string.h>  /* for memcpy() */

/*
 *  _Objects_Extend_information
 *
 *  This routine extends all object information related data structures.
 *
 *  Input parameters:
 *    information     - object information table
 *
 *  Output parameters:  NONE
 */

void _Objects_Extend_information(
  Objects_Information *information
)
{
  Objects_Control  *the_object;
  uint32_t          block_count;
  uint32_t          block;
  uint32_t          index_base;
  uint32_t          index_end;
  uint32_t          index;
  uint32_t          maximum;
  size_t            object_block_size;
  Objects_Control  *new_object_block;
  bool              do_extend;

  _Assert(
    _Objects_Allocator_is_owner()
      || !_System_state_Is_up( _System_state_Get() )
  );

  /*
   *  Search for a free block of indexes. If we do NOT need to allocate or
   *  extend the block table, then we will change do_extend.
   */
  do_extend     = true;
  index_base    = 0;
  block         = 0;

  if ( information->object_blocks == NULL )
    block_count = 0;
  else {
    block_count = information->maximum / information->objects_per_block;

    for ( ; block < block_count; block++ ) {
      if ( information->object_blocks[ block ] == NULL ) {
        do_extend = false;
        break;
      } else
        index_base += information->objects_per_block;
    }
  }
  index_end = index_base + information->objects_per_block;

  maximum = (uint32_t) information->maximum + information->objects_per_block;

  /*
   *  We need to limit the number of objects to the maximum number
   *  representable in the index portion of the object Id.  In the
   *  case of 16-bit Ids, this is only 256 object instances.
   */
  if ( maximum > OBJECTS_ID_FINAL_INDEX ) {
    return;
  }

  /*
   * Allocate the name table, and the objects and if it fails either return or
   * generate a fatal error depending on auto-extending being active.
   */
  object_block_size = information->objects_per_block
    * information->object_size;
  if ( information->auto_extend ) {
    new_object_block = _Workspace_Allocate( object_block_size );
    if ( !new_object_block )
      return;
  } else {
    new_object_block = _Workspace_Allocate_or_fatal_error( object_block_size );
  }

  /*
   *  Do we need to grow the tables?
   */
  if ( do_extend ) {
    ISR_lock_Context  lock_context;
    Objects_Control **object_blocks;
    Objects_Control **local_table;
    Objects_Maximum  *inactive_per_block;
    void             *old_tables;
    size_t            table_size;
    uintptr_t         object_blocks_size;
    uintptr_t         local_table_size;

    /*
     *  Growing the tables means allocating a new area, doing a copy and
     *  updating the information table.
     *
     *  If the maximum is minimum we do not have a table to copy. First
     *  time through.
     *
     *  The allocation has:
     *
     *      Objects_Control *object_blocks[ block_count ];
     *      Objects_Control *local_table[ maximum ];
     *      Objects_Maximum  inactive_count[ block_count ];
     *
     *  This is the order in memory. Watch changing the order. See the memcpy
     *  below.
     */

    /*
     *  Up the block count and maximum.
     */
    block_count++;

    /*
     *  Allocate the tables and break it up.
     */
    object_blocks_size = block_count * sizeof( *object_blocks );
    local_table_size =  maximum * sizeof( *local_table );
    table_size = object_blocks_size
      + local_table_size
      + block_count * sizeof( *inactive_per_block );
    if ( information->auto_extend ) {
      object_blocks = _Workspace_Allocate( table_size );
      if ( !object_blocks ) {
        _Workspace_Free( new_object_block );
        return;
      }
    } else {
      object_blocks = _Workspace_Allocate_or_fatal_error( table_size );
    }

    /*
     *  Break the block into the various sections.
     */
    local_table = _Addresses_Add_offset(
      object_blocks,
      object_blocks_size
    );
    inactive_per_block = _Addresses_Add_offset(
      local_table,
      local_table_size
    );

    /*
     *  Take the block count down. Saves all the (block_count - 1)
     *  in the copies.
     */
    block_count--;

    if ( information->maximum > 0 ) {
      /*
       *  Copy each section of the table over. This has to be performed as
       *  separate parts as size of each block has changed.
       */
      memcpy(
        object_blocks,
        information->object_blocks,
        block_count * sizeof( *object_blocks )
      );
      memcpy(
        inactive_per_block,
        information->inactive_per_block,
        block_count * sizeof( *inactive_per_block )
      );
      memcpy(
        local_table,
        information->local_table,
        information->maximum * sizeof( *local_table )
      );
    }

    /*
     *  Initialise the new entries in the table.
     */
    for ( index = index_base ; index < index_end ; ++index ) {
      local_table[ index ] = NULL;
    }

    /* FIXME: https://devel.rtems.org/ticket/2280 */
    _ISR_lock_ISR_disable( &lock_context );

    old_tables = information->object_blocks;

    information->object_blocks = object_blocks;
    information->inactive_per_block = inactive_per_block;
    information->local_table = local_table;
    information->maximum = (Objects_Maximum) maximum;
    information->maximum_id = _Objects_Build_id(
      information->the_api,
      information->the_class,
      _Objects_Local_node,
      information->maximum
    );

    _ISR_lock_ISR_enable( &lock_context );

    _Workspace_Free( old_tables );

    block_count++;
  }

  /*
   *  Assign the new object block to the object block table.
   */
  information->object_blocks[ block ] = new_object_block;
  information->inactive_per_block[ block ] = information->objects_per_block;
  information->inactive += information->objects_per_block;

  /*
   *  Append to inactive chain.
   */
  the_object = new_object_block;
  for ( index = index_base ; index < index_end ; ++index ) {
    the_object->id = _Objects_Build_id(
      information->the_api,
      information->the_class,
      _Objects_Local_node,
      index + OBJECTS_INDEX_MINIMUM
    );

    _Chain_Initialize_node( &the_object->Node );
    _Chain_Append_unprotected( &information->Inactive, &the_object->Node );

    the_object = _Addresses_Add_offset( the_object, information->object_size );
  }
}