nkeynes@26 | 1 | /**
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nkeynes@89 | 2 | * $Id: dreamcast.c,v 1.14 2006-01-22 22:42:05 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@2 | 22 | #include "mem.h"
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nkeynes@11 | 23 | #include "aica/aica.h"
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nkeynes@2 | 24 | #include "asic.h"
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nkeynes@2 | 25 | #include "dreamcast.h"
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nkeynes@25 | 26 | #include "gdrom/ide.h"
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nkeynes@25 | 27 | #include "maple/maple.h"
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nkeynes@15 | 28 |
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nkeynes@26 | 29 | /**
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nkeynes@26 | 30 | * Current state of the DC virtual machine
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nkeynes@26 | 31 | */
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nkeynes@26 | 32 | #define STATE_UNINIT 0
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nkeynes@26 | 33 | #define STATE_RUNNING 1
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nkeynes@26 | 34 | #define STATE_STOPPING 2
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nkeynes@26 | 35 | #define STATE_STOPPED 3
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nkeynes@26 | 36 | static volatile int dreamcast_state = STATE_UNINIT;
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nkeynes@26 | 37 | static uint32_t timeslice_length = DEFAULT_TIMESLICE_LENGTH;
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nkeynes@26 | 38 | static char *dreamcast_config = "DEFAULT";
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nkeynes@2 | 39 |
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nkeynes@15 | 40 | #define MAX_MODULES 32
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nkeynes@15 | 41 | static int num_modules = 0;
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nkeynes@16 | 42 | dreamcast_module_t modules[MAX_MODULES];
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nkeynes@15 | 43 |
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nkeynes@16 | 44 | /**
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nkeynes@35 | 45 | * The unknown module is used for logging files without an actual module
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nkeynes@35 | 46 | * declaration
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nkeynes@35 | 47 | */
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nkeynes@35 | 48 | struct dreamcast_module unknown_module = { "****", NULL, NULL, NULL, NULL,
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nkeynes@35 | 49 | NULL, NULL, NULL };
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nkeynes@35 | 50 |
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nkeynes@35 | 51 | /**
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nkeynes@16 | 52 | * This function is responsible for defining how all the pieces of the
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nkeynes@26 | 53 | * dreamcast actually fit together.
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nkeynes@16 | 54 | *
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nkeynes@16 | 55 | * Note currently the locations of the various MMIO pages are hard coded in
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nkeynes@16 | 56 | * the MMIO definitions - they should probably be moved here.
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nkeynes@16 | 57 | */
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nkeynes@15 | 58 | void dreamcast_configure( )
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nkeynes@15 | 59 | {
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nkeynes@16 | 60 | /* Register the memory framework */
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nkeynes@15 | 61 | dreamcast_register_module( &mem_module );
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nkeynes@16 | 62 |
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nkeynes@16 | 63 | /* Setup standard memory map */
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nkeynes@16 | 64 | mem_create_ram_region( 0x0C000000, 16 MB, MEM_REGION_MAIN );
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nkeynes@16 | 65 | mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
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nkeynes@16 | 66 | mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
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nkeynes@16 | 67 | mem_create_ram_region( 0x05000000, 8 MB, MEM_REGION_VIDEO );
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nkeynes@16 | 68 | mem_load_rom( "dcboot.rom", 0x00000000, 0x00200000, 0x89f2b1a1 );
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nkeynes@16 | 69 | mem_load_rom( "dcflash.rom",0x00200000, 0x00020000, 0x357c3568 );
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nkeynes@16 | 70 |
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nkeynes@16 | 71 | /* Load in the rest of the core modules */
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nkeynes@15 | 72 | dreamcast_register_module( &sh4_module );
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nkeynes@15 | 73 | dreamcast_register_module( &asic_module );
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nkeynes@15 | 74 | dreamcast_register_module( &pvr2_module );
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nkeynes@15 | 75 | dreamcast_register_module( &aica_module );
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nkeynes@15 | 76 | dreamcast_register_module( &maple_module );
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nkeynes@15 | 77 | dreamcast_register_module( &ide_module );
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nkeynes@16 | 78 |
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nkeynes@16 | 79 | /* Attach any default maple devices, ie a pair of controllers */
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nkeynes@16 | 80 | maple_device_t controller1 = controller_new();
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nkeynes@16 | 81 | maple_device_t controller2 = controller_new();
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nkeynes@16 | 82 | maple_attach_device( controller1, 0, 0 );
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nkeynes@16 | 83 | maple_attach_device( controller2, 1, 0 );
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nkeynes@15 | 84 | }
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nkeynes@15 | 85 |
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nkeynes@71 | 86 | /**
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nkeynes@71 | 87 | * Constructs a system configuration for the AICA in standalone mode,
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nkeynes@71 | 88 | * ie sound chip only.
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nkeynes@71 | 89 | */
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nkeynes@71 | 90 | void dreamcast_configure_aica_only( )
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nkeynes@71 | 91 | {
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nkeynes@71 | 92 | dreamcast_register_module( &mem_module );
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nkeynes@71 | 93 | mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
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nkeynes@71 | 94 | mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
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nkeynes@71 | 95 | dreamcast_register_module( &aica_module );
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nkeynes@89 | 96 | aica_enable();
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nkeynes@71 | 97 | dreamcast_state = STATE_STOPPED;
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nkeynes@71 | 98 | }
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nkeynes@71 | 99 |
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nkeynes@15 | 100 | void dreamcast_register_module( dreamcast_module_t module )
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nkeynes@15 | 101 | {
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nkeynes@15 | 102 | modules[num_modules++] = module;
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nkeynes@16 | 103 | if( module->init != NULL )
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nkeynes@16 | 104 | module->init();
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nkeynes@15 | 105 | }
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nkeynes@15 | 106 |
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nkeynes@15 | 107 |
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nkeynes@2 | 108 | void dreamcast_init( void )
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nkeynes@2 | 109 | {
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nkeynes@15 | 110 | dreamcast_configure();
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nkeynes@23 | 111 | dreamcast_state = STATE_STOPPED;
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nkeynes@2 | 112 | }
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nkeynes@2 | 113 |
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nkeynes@2 | 114 | void dreamcast_reset( void )
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nkeynes@2 | 115 | {
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nkeynes@15 | 116 | int i;
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nkeynes@15 | 117 | for( i=0; i<num_modules; i++ ) {
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nkeynes@15 | 118 | if( modules[i]->reset != NULL )
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nkeynes@15 | 119 | modules[i]->reset();
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nkeynes@15 | 120 | }
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nkeynes@2 | 121 | }
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nkeynes@2 | 122 |
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nkeynes@23 | 123 | void dreamcast_run( void )
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nkeynes@15 | 124 | {
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nkeynes@15 | 125 | int i;
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nkeynes@23 | 126 | if( dreamcast_state != STATE_RUNNING ) {
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nkeynes@23 | 127 | for( i=0; i<num_modules; i++ ) {
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nkeynes@23 | 128 | if( modules[i]->start != NULL )
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nkeynes@23 | 129 | modules[i]->start();
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nkeynes@23 | 130 | }
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nkeynes@15 | 131 | }
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nkeynes@23 | 132 | dreamcast_state = STATE_RUNNING;
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nkeynes@23 | 133 | while( dreamcast_state == STATE_RUNNING ) {
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nkeynes@27 | 134 | int time_to_run = timeslice_length;
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nkeynes@23 | 135 | for( i=0; i<num_modules; i++ ) {
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nkeynes@23 | 136 | if( modules[i]->run_time_slice != NULL )
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nkeynes@27 | 137 | time_to_run = modules[i]->run_time_slice( time_to_run );
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nkeynes@23 | 138 | }
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nkeynes@23 | 139 |
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nkeynes@23 | 140 | }
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nkeynes@23 | 141 |
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nkeynes@15 | 142 | for( i=0; i<num_modules; i++ ) {
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nkeynes@15 | 143 | if( modules[i]->stop != NULL )
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nkeynes@15 | 144 | modules[i]->stop();
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nkeynes@15 | 145 | }
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nkeynes@23 | 146 | dreamcast_state = STATE_STOPPED;
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nkeynes@2 | 147 | }
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nkeynes@15 | 148 |
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nkeynes@23 | 149 | void dreamcast_stop( void )
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nkeynes@23 | 150 | {
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nkeynes@23 | 151 | if( dreamcast_state == STATE_RUNNING )
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nkeynes@23 | 152 | dreamcast_state = STATE_STOPPING;
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nkeynes@23 | 153 | }
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nkeynes@17 | 154 |
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nkeynes@26 | 155 | gboolean dreamcast_is_running( void )
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nkeynes@26 | 156 | {
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nkeynes@26 | 157 | return dreamcast_state == STATE_RUNNING;
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nkeynes@26 | 158 | }
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nkeynes@26 | 159 |
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nkeynes@30 | 160 | /***************************** User Configuration **************************/
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nkeynes@30 | 161 |
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nkeynes@30 | 162 | void dreamcast_load_config( const gchar *filename )
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nkeynes@30 | 163 | {
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nkeynes@30 | 164 |
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nkeynes@30 | 165 |
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nkeynes@30 | 166 | }
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nkeynes@30 | 167 |
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nkeynes@30 | 168 | void dreamcast_save_config( const gchar *filename )
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nkeynes@30 | 169 | {
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nkeynes@30 | 170 |
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nkeynes@30 | 171 |
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nkeynes@30 | 172 | }
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nkeynes@26 | 173 |
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nkeynes@26 | 174 | /********************************* Save States *****************************/
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nkeynes@26 | 175 |
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nkeynes@26 | 176 | #define DREAMCAST_SAVE_MAGIC "%!-DreamOn!Save\0"
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nkeynes@26 | 177 | #define DREAMCAST_SAVE_VERSION 0x00010000
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nkeynes@26 | 178 |
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nkeynes@26 | 179 | struct save_state_header {
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nkeynes@26 | 180 | char magic[16];
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nkeynes@26 | 181 | uint32_t version;
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nkeynes@26 | 182 | uint32_t module_count;
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nkeynes@26 | 183 | };
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nkeynes@26 | 184 |
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nkeynes@18 | 185 | int dreamcast_load_state( const gchar *filename )
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nkeynes@15 | 186 | {
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nkeynes@17 | 187 | int i,j;
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nkeynes@17 | 188 | uint32_t count, len;
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nkeynes@17 | 189 | int have_read[MAX_MODULES];
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nkeynes@17 | 190 | char tmp[64];
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nkeynes@15 | 191 | struct save_state_header header;
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nkeynes@18 | 192 | FILE *f;
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nkeynes@18 | 193 |
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nkeynes@18 | 194 | f = fopen( filename, "r" );
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nkeynes@18 | 195 | if( f == NULL ) return errno;
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nkeynes@15 | 196 |
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nkeynes@15 | 197 | fread( &header, sizeof(header), 1, f );
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nkeynes@15 | 198 | if( strncmp( header.magic, DREAMCAST_SAVE_MAGIC, 16 ) != 0 ) {
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nkeynes@15 | 199 | ERROR( "Not a DreamOn save state file" );
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nkeynes@17 | 200 | return 1;
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nkeynes@15 | 201 | }
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nkeynes@15 | 202 | if( header.version != DREAMCAST_SAVE_VERSION ) {
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nkeynes@15 | 203 | ERROR( "DreamOn save state version not supported" );
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nkeynes@17 | 204 | return 1;
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nkeynes@17 | 205 | }
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nkeynes@18 | 206 | if( header.module_count > MAX_MODULES ) {
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nkeynes@18 | 207 | ERROR( "DreamOn save state is corrupted (bad module count)" );
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nkeynes@17 | 208 | return 1;
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nkeynes@17 | 209 | }
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nkeynes@17 | 210 | for( i=0; i<MAX_MODULES; i++ ) {
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nkeynes@17 | 211 | have_read[i] = 0;
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nkeynes@15 | 212 | }
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nkeynes@15 | 213 |
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nkeynes@18 | 214 | for( i=0; i<header.module_count; i++ ) {
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nkeynes@17 | 215 | fread(tmp, 4, 1, f );
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nkeynes@18 | 216 | if( strncmp(tmp, "BLCK", 4) != 0 ) {
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nkeynes@18 | 217 | ERROR( "DreamOn save state is corrupted (missing block header %d)", i );
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nkeynes@17 | 218 | return 2;
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nkeynes@17 | 219 | }
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nkeynes@17 | 220 | len = fread_string(tmp, sizeof(tmp), f );
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nkeynes@17 | 221 | if( len > 64 || len < 1 ) {
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nkeynes@18 | 222 | ERROR( "DreamOn save state is corrupted (bad string)" );
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nkeynes@17 | 223 | return 2;
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nkeynes@17 | 224 | }
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nkeynes@17 | 225 |
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nkeynes@17 | 226 | /* Find the matching module by name */
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nkeynes@17 | 227 | for( j=0; j<num_modules; j++ ) {
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nkeynes@17 | 228 | if( strcmp(modules[j]->name,tmp) == 0 ) {
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nkeynes@17 | 229 | have_read[j] = 1;
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nkeynes@17 | 230 | if( modules[j]->load == NULL ) {
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nkeynes@18 | 231 | ERROR( "DreamOn save state is corrupted (no loader for %s)", modules[j]->name );
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nkeynes@17 | 232 | return 2;
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nkeynes@17 | 233 | } else if( modules[j]->load(f) != 0 ) {
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nkeynes@18 | 234 | ERROR( "DreamOn save state is corrupted (%s failed)", modules[j]->name );
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nkeynes@17 | 235 | return 2;
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nkeynes@17 | 236 | }
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nkeynes@17 | 237 | break;
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nkeynes@17 | 238 | }
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nkeynes@17 | 239 | }
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nkeynes@17 | 240 | if( j == num_modules ) {
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nkeynes@17 | 241 | ERROR( "DreamOn save state contains unrecognized section" );
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nkeynes@17 | 242 | return 2;
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nkeynes@17 | 243 | }
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nkeynes@17 | 244 | }
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nkeynes@17 | 245 |
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nkeynes@17 | 246 | /* Any modules that we didn't load - reset to the default state.
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nkeynes@17 | 247 | * (ie it's not an error to skip a module if you don't actually
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nkeynes@17 | 248 | * care about its state).
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nkeynes@17 | 249 | */
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nkeynes@17 | 250 | for( j=0; j<num_modules; j++ ) {
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nkeynes@17 | 251 | if( have_read[j] == 0 && modules[j]->reset != NULL ) {
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nkeynes@17 | 252 | modules[j]->reset();
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nkeynes@17 | 253 | }
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nkeynes@15 | 254 | }
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nkeynes@18 | 255 | fclose(f);
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nkeynes@18 | 256 | INFO( "Save state read from %s", filename );
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nkeynes@15 | 257 | }
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nkeynes@15 | 258 |
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nkeynes@18 | 259 | int dreamcast_save_state( const gchar *filename )
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nkeynes@15 | 260 | {
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nkeynes@15 | 261 | int i;
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nkeynes@18 | 262 | FILE *f;
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nkeynes@15 | 263 | struct save_state_header header;
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nkeynes@15 | 264 |
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nkeynes@18 | 265 | f = fopen( filename, "w" );
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nkeynes@18 | 266 | if( f == NULL )
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nkeynes@18 | 267 | return errno;
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nkeynes@15 | 268 | strcpy( header.magic, DREAMCAST_SAVE_MAGIC );
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nkeynes@15 | 269 | header.version = DREAMCAST_SAVE_VERSION;
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nkeynes@18 | 270 | header.module_count = 0;
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nkeynes@18 | 271 |
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nkeynes@18 | 272 | for( i=0; i<num_modules; i++ ) {
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nkeynes@18 | 273 | if( modules[i]->save != NULL )
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nkeynes@18 | 274 | header.module_count++;
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nkeynes@18 | 275 | }
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nkeynes@15 | 276 | fwrite( &header, sizeof(header), 1, f );
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nkeynes@15 | 277 | for( i=0; i<num_modules; i++ ) {
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nkeynes@15 | 278 | if( modules[i]->save != NULL ) {
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nkeynes@17 | 279 | fwrite( "BLCK", 4, 1, f );
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nkeynes@17 | 280 | fwrite_string( modules[i]->name, f );
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nkeynes@15 | 281 | modules[i]->save(f);
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nkeynes@15 | 282 | }
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nkeynes@15 | 283 | }
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nkeynes@18 | 284 | fclose( f );
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nkeynes@18 | 285 | INFO( "Save state written to %s", filename );
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nkeynes@15 | 286 | }
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nkeynes@15 | 287 |
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