nkeynes@26 | 1 | /**
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nkeynes@461 | 2 | * $Id: dreamcast.c,v 1.25 2007-10-23 10:48:24 nkeynes Exp $
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nkeynes@26 | 3 | * Central switchboard for the system. This pulls all the individual modules
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nkeynes@26 | 4 | * together into some kind of coherent structure. This is also where you'd
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nkeynes@26 | 5 | * add Naomi support, if I ever get a board to play with...
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nkeynes@26 | 6 | *
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nkeynes@26 | 7 | * Copyright (c) 2005 Nathan Keynes.
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nkeynes@26 | 8 | *
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nkeynes@26 | 9 | * This program is free software; you can redistribute it and/or modify
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nkeynes@26 | 10 | * it under the terms of the GNU General Public License as published by
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nkeynes@26 | 11 | * the Free Software Foundation; either version 2 of the License, or
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nkeynes@26 | 12 | * (at your option) any later version.
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nkeynes@26 | 13 | *
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nkeynes@26 | 14 | * This program is distributed in the hope that it will be useful,
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nkeynes@26 | 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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nkeynes@26 | 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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nkeynes@26 | 17 | * GNU General Public License for more details.
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nkeynes@26 | 18 | */
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nkeynes@26 | 19 |
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nkeynes@18 | 20 | #include <errno.h>
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nkeynes@2 | 21 | #include "dream.h"
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nkeynes@450 | 22 | #include "config.h"
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nkeynes@2 | 23 | #include "mem.h"
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nkeynes@11 | 24 | #include "aica/aica.h"
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nkeynes@2 | 25 | #include "asic.h"
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nkeynes@2 | 26 | #include "dreamcast.h"
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nkeynes@25 | 27 | #include "gdrom/ide.h"
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nkeynes@25 | 28 | #include "maple/maple.h"
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nkeynes@15 | 29 |
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nkeynes@26 | 30 | /**
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nkeynes@26 | 31 | * Current state of the DC virtual machine
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nkeynes@26 | 32 | */
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nkeynes@26 | 33 | #define STATE_UNINIT 0
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nkeynes@26 | 34 | #define STATE_RUNNING 1
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nkeynes@26 | 35 | #define STATE_STOPPING 2
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nkeynes@26 | 36 | #define STATE_STOPPED 3
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nkeynes@26 | 37 | static volatile int dreamcast_state = STATE_UNINIT;
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nkeynes@26 | 38 | static uint32_t timeslice_length = DEFAULT_TIMESLICE_LENGTH;
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nkeynes@422 | 39 | const char *dreamcast_config = "DEFAULT";
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nkeynes@2 | 40 |
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nkeynes@15 | 41 | #define MAX_MODULES 32
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nkeynes@15 | 42 | static int num_modules = 0;
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nkeynes@16 | 43 | dreamcast_module_t modules[MAX_MODULES];
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nkeynes@15 | 44 |
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nkeynes@16 | 45 | /**
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nkeynes@35 | 46 | * The unknown module is used for logging files without an actual module
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nkeynes@35 | 47 | * declaration
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nkeynes@35 | 48 | */
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nkeynes@35 | 49 | struct dreamcast_module unknown_module = { "****", NULL, NULL, NULL, NULL,
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nkeynes@35 | 50 | NULL, NULL, NULL };
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nkeynes@35 | 51 |
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nkeynes@35 | 52 | /**
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nkeynes@16 | 53 | * This function is responsible for defining how all the pieces of the
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nkeynes@26 | 54 | * dreamcast actually fit together.
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nkeynes@16 | 55 | *
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nkeynes@16 | 56 | * Note currently the locations of the various MMIO pages are hard coded in
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nkeynes@16 | 57 | * the MMIO definitions - they should probably be moved here.
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nkeynes@16 | 58 | */
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nkeynes@15 | 59 | void dreamcast_configure( )
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nkeynes@15 | 60 | {
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nkeynes@265 | 61 | dreamcast_register_module( &eventq_module );
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nkeynes@16 | 62 | /* Register the memory framework */
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nkeynes@15 | 63 | dreamcast_register_module( &mem_module );
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nkeynes@16 | 64 |
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nkeynes@16 | 65 | /* Setup standard memory map */
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nkeynes@146 | 66 | mem_create_repeating_ram_region( 0x0C000000, 16 MB, MEM_REGION_MAIN, 0x01000000, 0x0F000000 );
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nkeynes@16 | 67 | mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
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nkeynes@16 | 68 | mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
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nkeynes@16 | 69 | mem_create_ram_region( 0x05000000, 8 MB, MEM_REGION_VIDEO );
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nkeynes@450 | 70 | if( mem_load_rom( lxdream_get_config_value(CONFIG_BIOS_PATH),
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nkeynes@180 | 71 | 0x00000000, 0x00200000, 0x89f2b1a1 ) == NULL ) {
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nkeynes@180 | 72 | /* Bios wasn't found. Dump an empty ram region in there for something to do */
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nkeynes@180 | 73 | mem_create_ram_region( 0x00000000, 0x00200000, MEM_REGION_BIOS );
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nkeynes@180 | 74 | }
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nkeynes@146 | 75 | mem_create_ram_region( 0x00200000, 0x00020000, MEM_REGION_FLASH );
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nkeynes@450 | 76 | mem_load_block( lxdream_get_config_value(CONFIG_FLASH_PATH),
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nkeynes@167 | 77 | 0x00200000, 0x00020000 );
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nkeynes@16 | 78 |
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nkeynes@16 | 79 | /* Load in the rest of the core modules */
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nkeynes@15 | 80 | dreamcast_register_module( &sh4_module );
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nkeynes@15 | 81 | dreamcast_register_module( &asic_module );
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nkeynes@15 | 82 | dreamcast_register_module( &pvr2_module );
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nkeynes@15 | 83 | dreamcast_register_module( &aica_module );
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nkeynes@15 | 84 | dreamcast_register_module( &maple_module );
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nkeynes@15 | 85 | dreamcast_register_module( &ide_module );
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nkeynes@15 | 86 | }
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nkeynes@15 | 87 |
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nkeynes@461 | 88 | void dreamcast_config_changed(void)
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nkeynes@461 | 89 | {
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nkeynes@461 | 90 | mem_load_rom( lxdream_get_config_value(CONFIG_BIOS_PATH),
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nkeynes@461 | 91 | 0x00000000, 0x00200000, 0x89f2b1a1 );
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nkeynes@461 | 92 | mem_load_block( lxdream_get_config_value(CONFIG_FLASH_PATH),
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nkeynes@461 | 93 | 0x00200000, 0x00020000 );
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nkeynes@461 | 94 | }
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nkeynes@461 | 95 |
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nkeynes@277 | 96 | void dreamcast_save_flash()
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nkeynes@277 | 97 | {
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nkeynes@450 | 98 | const char *file = lxdream_get_config_value(CONFIG_FLASH_PATH);
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nkeynes@277 | 99 | mem_save_block( file, 0x00200000, 0x00020000 );
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nkeynes@277 | 100 | }
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nkeynes@277 | 101 |
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nkeynes@71 | 102 | /**
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nkeynes@71 | 103 | * Constructs a system configuration for the AICA in standalone mode,
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nkeynes@71 | 104 | * ie sound chip only.
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nkeynes@71 | 105 | */
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nkeynes@71 | 106 | void dreamcast_configure_aica_only( )
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nkeynes@71 | 107 | {
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nkeynes@71 | 108 | dreamcast_register_module( &mem_module );
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nkeynes@71 | 109 | mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
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nkeynes@71 | 110 | mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
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nkeynes@71 | 111 | dreamcast_register_module( &aica_module );
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nkeynes@89 | 112 | aica_enable();
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nkeynes@71 | 113 | dreamcast_state = STATE_STOPPED;
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nkeynes@71 | 114 | }
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nkeynes@71 | 115 |
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nkeynes@15 | 116 | void dreamcast_register_module( dreamcast_module_t module )
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nkeynes@15 | 117 | {
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nkeynes@15 | 118 | modules[num_modules++] = module;
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nkeynes@16 | 119 | if( module->init != NULL )
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nkeynes@16 | 120 | module->init();
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nkeynes@15 | 121 | }
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nkeynes@15 | 122 |
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nkeynes@15 | 123 |
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nkeynes@2 | 124 | void dreamcast_init( void )
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nkeynes@2 | 125 | {
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nkeynes@15 | 126 | dreamcast_configure();
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nkeynes@23 | 127 | dreamcast_state = STATE_STOPPED;
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nkeynes@2 | 128 | }
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nkeynes@2 | 129 |
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nkeynes@2 | 130 | void dreamcast_reset( void )
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nkeynes@2 | 131 | {
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nkeynes@15 | 132 | int i;
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nkeynes@15 | 133 | for( i=0; i<num_modules; i++ ) {
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nkeynes@15 | 134 | if( modules[i]->reset != NULL )
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nkeynes@15 | 135 | modules[i]->reset();
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nkeynes@15 | 136 | }
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nkeynes@2 | 137 | }
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nkeynes@2 | 138 |
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nkeynes@23 | 139 | void dreamcast_run( void )
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nkeynes@15 | 140 | {
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nkeynes@15 | 141 | int i;
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nkeynes@23 | 142 | if( dreamcast_state != STATE_RUNNING ) {
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nkeynes@23 | 143 | for( i=0; i<num_modules; i++ ) {
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nkeynes@23 | 144 | if( modules[i]->start != NULL )
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nkeynes@23 | 145 | modules[i]->start();
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nkeynes@23 | 146 | }
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nkeynes@15 | 147 | }
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nkeynes@23 | 148 | dreamcast_state = STATE_RUNNING;
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nkeynes@23 | 149 | while( dreamcast_state == STATE_RUNNING ) {
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nkeynes@27 | 150 | int time_to_run = timeslice_length;
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nkeynes@23 | 151 | for( i=0; i<num_modules; i++ ) {
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nkeynes@23 | 152 | if( modules[i]->run_time_slice != NULL )
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nkeynes@27 | 153 | time_to_run = modules[i]->run_time_slice( time_to_run );
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nkeynes@23 | 154 | }
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nkeynes@23 | 155 |
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nkeynes@23 | 156 | }
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nkeynes@23 | 157 |
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nkeynes@15 | 158 | for( i=0; i<num_modules; i++ ) {
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nkeynes@15 | 159 | if( modules[i]->stop != NULL )
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nkeynes@15 | 160 | modules[i]->stop();
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nkeynes@15 | 161 | }
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nkeynes@23 | 162 | dreamcast_state = STATE_STOPPED;
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nkeynes@2 | 163 | }
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nkeynes@15 | 164 |
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nkeynes@372 | 165 | void dreamcast_run_for( unsigned int seconds, unsigned int nanosecs )
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nkeynes@372 | 166 | {
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nkeynes@372 | 167 |
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nkeynes@372 | 168 | int i;
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nkeynes@372 | 169 | if( dreamcast_state != STATE_RUNNING ) {
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nkeynes@372 | 170 | for( i=0; i<num_modules; i++ ) {
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nkeynes@372 | 171 | if( modules[i]->start != NULL )
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nkeynes@372 | 172 | modules[i]->start();
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nkeynes@372 | 173 | }
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nkeynes@372 | 174 | }
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nkeynes@372 | 175 | dreamcast_state = STATE_RUNNING;
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nkeynes@372 | 176 | uint32_t nanos = 0;
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nkeynes@372 | 177 | if( nanosecs != 0 ) {
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nkeynes@372 | 178 | nanos = 1000000000 - nanosecs;
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nkeynes@372 | 179 | seconds++;
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nkeynes@372 | 180 | }
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nkeynes@372 | 181 | while( dreamcast_state == STATE_RUNNING && seconds != 0 ) {
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nkeynes@372 | 182 | int time_to_run = timeslice_length;
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nkeynes@372 | 183 | for( i=0; i<num_modules; i++ ) {
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nkeynes@372 | 184 | if( modules[i]->run_time_slice != NULL )
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nkeynes@372 | 185 | time_to_run = modules[i]->run_time_slice( time_to_run );
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nkeynes@372 | 186 | }
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nkeynes@372 | 187 | nanos += time_to_run;
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nkeynes@372 | 188 | if( nanos >= 1000000000 ) {
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nkeynes@372 | 189 | nanos -= 1000000000;
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nkeynes@372 | 190 | seconds--;
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nkeynes@372 | 191 | }
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nkeynes@372 | 192 | }
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nkeynes@372 | 193 |
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nkeynes@372 | 194 | for( i=0; i<num_modules; i++ ) {
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nkeynes@372 | 195 | if( modules[i]->stop != NULL )
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nkeynes@372 | 196 | modules[i]->stop();
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nkeynes@372 | 197 | }
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nkeynes@372 | 198 | dreamcast_state = STATE_STOPPED;
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nkeynes@372 | 199 | }
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nkeynes@372 | 200 |
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nkeynes@23 | 201 | void dreamcast_stop( void )
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nkeynes@23 | 202 | {
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nkeynes@23 | 203 | if( dreamcast_state == STATE_RUNNING )
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nkeynes@23 | 204 | dreamcast_state = STATE_STOPPING;
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nkeynes@23 | 205 | }
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nkeynes@17 | 206 |
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nkeynes@277 | 207 | void dreamcast_shutdown()
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nkeynes@277 | 208 | {
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nkeynes@277 | 209 | dreamcast_stop();
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nkeynes@277 | 210 | dreamcast_save_flash();
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nkeynes@277 | 211 | }
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nkeynes@277 | 212 |
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nkeynes@26 | 213 | gboolean dreamcast_is_running( void )
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nkeynes@26 | 214 | {
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nkeynes@26 | 215 | return dreamcast_state == STATE_RUNNING;
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nkeynes@26 | 216 | }
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nkeynes@26 | 217 |
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nkeynes@26 | 218 | /********************************* Save States *****************************/
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nkeynes@26 | 219 |
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nkeynes@26 | 220 | struct save_state_header {
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nkeynes@26 | 221 | char magic[16];
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nkeynes@26 | 222 | uint32_t version;
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nkeynes@26 | 223 | uint32_t module_count;
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nkeynes@26 | 224 | };
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nkeynes@26 | 225 |
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nkeynes@18 | 226 | int dreamcast_load_state( const gchar *filename )
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nkeynes@15 | 227 | {
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nkeynes@17 | 228 | int i,j;
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nkeynes@422 | 229 | uint32_t len;
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nkeynes@17 | 230 | int have_read[MAX_MODULES];
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nkeynes@17 | 231 | char tmp[64];
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nkeynes@15 | 232 | struct save_state_header header;
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nkeynes@18 | 233 | FILE *f;
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nkeynes@18 | 234 |
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nkeynes@18 | 235 | f = fopen( filename, "r" );
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nkeynes@18 | 236 | if( f == NULL ) return errno;
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nkeynes@15 | 237 |
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nkeynes@15 | 238 | fread( &header, sizeof(header), 1, f );
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nkeynes@15 | 239 | if( strncmp( header.magic, DREAMCAST_SAVE_MAGIC, 16 ) != 0 ) {
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nkeynes@180 | 240 | ERROR( "Not a %s save state file", APP_NAME );
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nkeynes@17 | 241 | return 1;
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nkeynes@15 | 242 | }
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nkeynes@15 | 243 | if( header.version != DREAMCAST_SAVE_VERSION ) {
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nkeynes@180 | 244 | ERROR( "%s save state version not supported", APP_NAME );
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nkeynes@17 | 245 | return 1;
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nkeynes@17 | 246 | }
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nkeynes@18 | 247 | if( header.module_count > MAX_MODULES ) {
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nkeynes@180 | 248 | ERROR( "%s save state is corrupted (bad module count)", APP_NAME );
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nkeynes@17 | 249 | return 1;
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nkeynes@17 | 250 | }
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nkeynes@17 | 251 | for( i=0; i<MAX_MODULES; i++ ) {
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nkeynes@17 | 252 | have_read[i] = 0;
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nkeynes@15 | 253 | }
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nkeynes@15 | 254 |
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nkeynes@18 | 255 | for( i=0; i<header.module_count; i++ ) {
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nkeynes@17 | 256 | fread(tmp, 4, 1, f );
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nkeynes@18 | 257 | if( strncmp(tmp, "BLCK", 4) != 0 ) {
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nkeynes@180 | 258 | ERROR( "%s save state is corrupted (missing block header %d)", APP_NAME, i );
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nkeynes@17 | 259 | return 2;
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nkeynes@17 | 260 | }
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nkeynes@17 | 261 | len = fread_string(tmp, sizeof(tmp), f );
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nkeynes@17 | 262 | if( len > 64 || len < 1 ) {
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nkeynes@180 | 263 | ERROR( "%s save state is corrupted (bad string)", APP_NAME );
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nkeynes@17 | 264 | return 2;
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nkeynes@17 | 265 | }
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nkeynes@17 | 266 |
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nkeynes@17 | 267 | /* Find the matching module by name */
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nkeynes@17 | 268 | for( j=0; j<num_modules; j++ ) {
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nkeynes@17 | 269 | if( strcmp(modules[j]->name,tmp) == 0 ) {
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nkeynes@17 | 270 | have_read[j] = 1;
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nkeynes@17 | 271 | if( modules[j]->load == NULL ) {
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nkeynes@180 | 272 | ERROR( "%s save state is corrupted (no loader for %s)", APP_NAME, modules[j]->name );
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nkeynes@17 | 273 | return 2;
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nkeynes@17 | 274 | } else if( modules[j]->load(f) != 0 ) {
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nkeynes@180 | 275 | ERROR( "%s save state is corrupted (%s failed)", APP_NAME, modules[j]->name );
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nkeynes@17 | 276 | return 2;
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nkeynes@17 | 277 | }
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nkeynes@17 | 278 | break;
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nkeynes@17 | 279 | }
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nkeynes@17 | 280 | }
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nkeynes@17 | 281 | if( j == num_modules ) {
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nkeynes@180 | 282 | ERROR( "%s save state contains unrecognized section", APP_NAME );
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nkeynes@17 | 283 | return 2;
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nkeynes@17 | 284 | }
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nkeynes@17 | 285 | }
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nkeynes@17 | 286 |
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nkeynes@17 | 287 | /* Any modules that we didn't load - reset to the default state.
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nkeynes@17 | 288 | * (ie it's not an error to skip a module if you don't actually
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nkeynes@17 | 289 | * care about its state).
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nkeynes@17 | 290 | */
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nkeynes@17 | 291 | for( j=0; j<num_modules; j++ ) {
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nkeynes@17 | 292 | if( have_read[j] == 0 && modules[j]->reset != NULL ) {
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nkeynes@17 | 293 | modules[j]->reset();
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nkeynes@17 | 294 | }
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nkeynes@15 | 295 | }
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nkeynes@18 | 296 | fclose(f);
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nkeynes@18 | 297 | INFO( "Save state read from %s", filename );
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nkeynes@422 | 298 | return 0;
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nkeynes@15 | 299 | }
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nkeynes@15 | 300 |
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nkeynes@18 | 301 | int dreamcast_save_state( const gchar *filename )
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nkeynes@15 | 302 | {
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nkeynes@15 | 303 | int i;
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nkeynes@18 | 304 | FILE *f;
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nkeynes@15 | 305 | struct save_state_header header;
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nkeynes@15 | 306 |
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nkeynes@18 | 307 | f = fopen( filename, "w" );
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nkeynes@18 | 308 | if( f == NULL )
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nkeynes@18 | 309 | return errno;
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nkeynes@15 | 310 | strcpy( header.magic, DREAMCAST_SAVE_MAGIC );
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nkeynes@15 | 311 | header.version = DREAMCAST_SAVE_VERSION;
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nkeynes@18 | 312 | header.module_count = 0;
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nkeynes@18 | 313 |
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nkeynes@18 | 314 | for( i=0; i<num_modules; i++ ) {
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nkeynes@18 | 315 | if( modules[i]->save != NULL )
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nkeynes@18 | 316 | header.module_count++;
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nkeynes@18 | 317 | }
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nkeynes@15 | 318 | fwrite( &header, sizeof(header), 1, f );
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nkeynes@15 | 319 | for( i=0; i<num_modules; i++ ) {
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nkeynes@15 | 320 | if( modules[i]->save != NULL ) {
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nkeynes@17 | 321 | fwrite( "BLCK", 4, 1, f );
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nkeynes@17 | 322 | fwrite_string( modules[i]->name, f );
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nkeynes@15 | 323 | modules[i]->save(f);
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nkeynes@15 | 324 | }
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nkeynes@15 | 325 | }
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nkeynes@18 | 326 | fclose( f );
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nkeynes@18 | 327 | INFO( "Save state written to %s", filename );
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nkeynes@422 | 328 | return 0;
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nkeynes@15 | 329 | }
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nkeynes@15 | 330 |
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