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extmem.c
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extmem.c
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/* MegaZeux
*
* Copyright (C) 2007 Kevin Vance <kvance@kvance.com>
*
* This program 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 2 of
* the License, or (at your option) any later version.
*
* This program 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* This file is only used on NDS, and is not even compiled on
* other systems. It handles transferral of main-memory data structures
* into slower external memory to reduce memory pressure.
*/
#include "extmem.h"
#include "dlmalloc.h"
#include "robot.h"
// Move the robot's memory from normal RAM to extra RAM.
static void store_robot_to_extram(struct robot *robot)
{
if(!robot)
return;
// Store the stack in extram.
if(!nds_ext_in(&robot->stack, robot->stack_size * sizeof(int))) {}
// TODO: handle out-of-memory
// Store the program in extram, noting the address change.
if(!nds_ext_in(&robot->program_bytecode, robot->program_bytecode_length)) {}
// TODO: handle out-of-memory
if(robot->used)
{
clear_label_cache(robot->label_list, robot->num_labels);
robot->label_list = cache_robot_labels(robot, &robot->num_labels);
}
}
// Move the robot's memory from extra RAM to normal RAM.
static void retrieve_robot_from_extram(struct robot *robot)
{
if(!robot)
return;
if(!nds_ext_out(&robot->stack, robot->stack_size * sizeof(int))) {}
// TODO: handle out-of-memory
if(!nds_ext_out(&robot->program_bytecode, robot->program_bytecode_length)) {}
// TODO: handle out-of-memory
if(robot->used)
{
clear_label_cache(robot->label_list, robot->num_labels);
robot->label_list = cache_robot_labels(robot, &robot->num_labels);
}
}
// Move the board's memory from normal RAM to extra RAM.
void store_board_to_extram(struct board *board)
{
size_t i, num_fields;
int size, j;
char **ptr_list[] =
{
&board->level_id, &board->level_param, &board->level_color,
&board->level_under_id, &board->level_under_param,
&board->level_under_color, &board->overlay, &board->overlay_color
};
// Skip the last 2 pointers if overlays are disabled.
num_fields = sizeof(ptr_list)/sizeof(*ptr_list);
if(!board->overlay_mode)
num_fields -= 2;
size = board->board_width * board->board_height;
for(i = 0; i < num_fields; i++)
if(!nds_ext_in((void**)ptr_list[i], size)) {}
// TODO: handle out-of-memory
// Copy the robots if necessary.
if(board->robot_list)
for(j = 1; j <= board->num_robots; j++)
store_robot_to_extram(board->robot_list[j]);
}
// Move the board's memory from normal RAM to extra RAM.
void retrieve_board_from_extram(struct board *board)
{
size_t i, num_fields;
int j, size;
char **ptr_list[] =
{
&board->level_id, &board->level_param, &board->level_color,
&board->level_under_id, &board->level_under_param,
&board->level_under_color, &board->overlay, &board->overlay_color
};
// Skip the last 2 pointers if overlays are disabled.
num_fields = sizeof(ptr_list)/sizeof(*ptr_list);
if(!board->overlay_mode)
num_fields -= 2;
size = board->board_width * board->board_height;
for(i = 0; i < num_fields; i++)
if(!nds_ext_out((void**)ptr_list[i], size)) {}
// TODO: handle out-of-memory
// Copy the robots if necessary.
if(board->robot_list)
for(j = 1; j <= board->num_robots; j++)
retrieve_robot_from_extram(board->robot_list[j]);
}
// Set the current board to cur_board, in regular memory.
void set_current_board(struct world *mzx_world, struct board *cur_board)
{
if(mzx_world->current_board)
store_board_to_extram(mzx_world->current_board);
mzx_world->current_board = cur_board;
}
// Set the current board to cur_board, in extra memory.
void set_current_board_ext(struct world *mzx_world, struct board *cur_board)
{
set_current_board(mzx_world, cur_board);
retrieve_board_from_extram(cur_board);
}