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lxdream.org :: lxdream/src/dreamcast.c
lxdream 0.9.1
released Jun 29
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filename src/dreamcast.c
changeset 180:e6dcf9b65658
prev167:71c0cc416a64
next265:5daf59b7f31b
author nkeynes
date Sun Jul 02 04:59:00 2006 +0000 (14 years ago)
permissions -rw-r--r--
last change Merge changes made on the MILESTONE1 branch back into head (mostly
release touchups)
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     1 /**
     2  * $Id: dreamcast.c,v 1.18 2006-07-02 04:59:00 nkeynes Exp $
     3  * Central switchboard for the system. This pulls all the individual modules
     4  * together into some kind of coherent structure. This is also where you'd
     5  * add Naomi support, if I ever get a board to play with...
     6  *
     7  * Copyright (c) 2005 Nathan Keynes.
     8  *
     9  * This program is free software; you can redistribute it and/or modify
    10  * it under the terms of the GNU General Public License as published by
    11  * the Free Software Foundation; either version 2 of the License, or
    12  * (at your option) any later version.
    13  *
    14  * This program is distributed in the hope that it will be useful,
    15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    17  * GNU General Public License for more details.
    18  */
    20 #include <errno.h>
    21 #include <glib/gstrfuncs.h>
    22 #include "dream.h"
    23 #include "mem.h"
    24 #include "aica/aica.h"
    25 #include "asic.h"
    26 #include "dreamcast.h"
    27 #include "gdrom/ide.h"
    28 #include "maple/maple.h"
    30 /**
    31  * Current state of the DC virtual machine
    32  */
    33 #define STATE_UNINIT 0
    34 #define STATE_RUNNING 1
    35 #define STATE_STOPPING 2
    36 #define STATE_STOPPED 3 
    37 static volatile int dreamcast_state = STATE_UNINIT;
    38 static uint32_t timeslice_length = DEFAULT_TIMESLICE_LENGTH;
    39 static char *dreamcast_config = "DEFAULT";
    41 #define MAX_MODULES 32
    42 static int num_modules = 0;
    43 dreamcast_module_t modules[MAX_MODULES];
    45 /**
    46  * The unknown module is used for logging files without an actual module
    47  * declaration
    48  */
    49 struct dreamcast_module unknown_module = { "****", NULL, NULL, NULL, NULL, 
    50 					   NULL, NULL, NULL };
    52 /**
    53  * This function is responsible for defining how all the pieces of the
    54  * dreamcast actually fit together. 
    55  *
    56  * Note currently the locations of the various MMIO pages are hard coded in
    57  * the MMIO definitions - they should probably be moved here.
    58  */
    59 void dreamcast_configure( )
    60 {
    61     /* Register the memory framework */
    62     dreamcast_register_module( &mem_module );
    64     /* Setup standard memory map */
    65     mem_create_repeating_ram_region( 0x0C000000, 16 MB, MEM_REGION_MAIN, 0x01000000, 0x0F000000 );
    66     mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
    67     mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
    68     mem_create_ram_region( 0x05000000, 8 MB, MEM_REGION_VIDEO );
    69     if( mem_load_rom( dreamcast_get_config_value(CONFIG_BIOS_PATH),
    70 		      0x00000000, 0x00200000, 0x89f2b1a1 ) == NULL ) {
    71 	/* Bios wasn't found. Dump an empty ram region in there for something to do */
    72 	mem_create_ram_region( 0x00000000, 0x00200000, MEM_REGION_BIOS );
    73     }
    74     mem_create_ram_region( 0x00200000, 0x00020000, MEM_REGION_FLASH );
    75     mem_load_block( dreamcast_get_config_value(CONFIG_FLASH_PATH),
    76 		    0x00200000, 0x00020000 );
    78     /* Load in the rest of the core modules */
    79     dreamcast_register_module( &sh4_module );
    80     dreamcast_register_module( &asic_module );
    81     dreamcast_register_module( &pvr2_module );
    82     dreamcast_register_module( &aica_module );
    83     dreamcast_register_module( &maple_module );
    84     dreamcast_register_module( &ide_module );
    85 }
    87 /**
    88  * Constructs a system configuration for the AICA in standalone mode,
    89  * ie sound chip only.
    90  */
    91 void dreamcast_configure_aica_only( )
    92 {
    93     dreamcast_register_module( &mem_module );
    94     mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
    95     mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
    96     dreamcast_register_module( &aica_module );
    97     aica_enable();
    98     dreamcast_state = STATE_STOPPED;
    99 }
   101 void dreamcast_register_module( dreamcast_module_t module ) 
   102 {
   103     modules[num_modules++] = module;
   104     if( module->init != NULL )
   105 	module->init();
   106 }
   109 void dreamcast_init( void )
   110 {
   111     dreamcast_configure();
   112     dreamcast_state = STATE_STOPPED;
   113 }
   115 void dreamcast_reset( void )
   116 {
   117     int i;
   118     for( i=0; i<num_modules; i++ ) {
   119 	if( modules[i]->reset != NULL )
   120 	    modules[i]->reset();
   121     }
   122 }
   124 void dreamcast_run( void )
   125 {
   126     int i;
   127     if( dreamcast_state != STATE_RUNNING ) {
   128 	for( i=0; i<num_modules; i++ ) {
   129 	    if( modules[i]->start != NULL )
   130 		modules[i]->start();
   131 	}
   132     }
   133     dreamcast_state = STATE_RUNNING;
   134     while( dreamcast_state == STATE_RUNNING ) {
   135 	int time_to_run = timeslice_length;
   136 	for( i=0; i<num_modules; i++ ) {
   137 	    if( modules[i]->run_time_slice != NULL )
   138 		time_to_run = modules[i]->run_time_slice( time_to_run );
   139 	}
   141     }
   143     for( i=0; i<num_modules; i++ ) {
   144 	if( modules[i]->stop != NULL )
   145 	    modules[i]->stop();
   146     }
   147     dreamcast_state = STATE_STOPPED;
   148 }
   150 void dreamcast_stop( void )
   151 {
   152     if( dreamcast_state == STATE_RUNNING )
   153 	dreamcast_state = STATE_STOPPING;
   154 }
   156 gboolean dreamcast_is_running( void )
   157 {
   158     return dreamcast_state == STATE_RUNNING;
   159 }
   161 /***************************** User Configuration **************************/
   164 static struct dreamcast_config_entry global_config[] =
   165     {{ "bios", CONFIG_TYPE_FILE, "dcboot.rom" },
   166      { "flash", CONFIG_TYPE_FILE, "dcflash.rom" },
   167      { "default path", CONFIG_TYPE_PATH, "." },
   168      { "save path", CONFIG_TYPE_PATH, "save" },
   169      { "bootstrap", CONFIG_TYPE_FILE, "IP.BIN" },
   170      { NULL, CONFIG_TYPE_NONE }};
   172 static struct dreamcast_config_entry serial_config[] =
   173     {{ "device", CONFIG_TYPE_FILE, "/dev/ttyS1" },
   174      { NULL, CONFIG_TYPE_NONE }};
   176 struct dreamcast_config_group dreamcast_config_root[] = 
   177     {{ "global", global_config },
   178      { "controllers", NULL },
   179      { "serial", serial_config },
   180      { NULL, CONFIG_TYPE_NONE }};
   182 void dreamcast_set_default_config( )
   183 {
   184     struct dreamcast_config_group *group = dreamcast_config_root;
   185     while( group->key != NULL ) {
   186 	struct dreamcast_config_entry *param = group->params;
   187 	if( param != NULL ) {
   188 	    while( param->key != NULL ) {
   189 		if( param->value != param->default_value ) {
   190 		    if( param->value != NULL )
   191 			free( param->value );
   192 		    param->value = (gchar *)param->default_value;
   193 		}
   194 		param++;
   195 	    }
   196 	}
   197 	group++;
   198     }
   199     maple_detach_all();
   200 }
   202 const gchar *dreamcast_get_config_value( int key )
   203 {
   204     return global_config[key].value;
   205 }
   207 gboolean dreamcast_load_config( const gchar *filename )
   208 {
   209     FILE *f = fopen(filename, "ro");
   210     gboolean result;
   212     if( f == NULL ) {
   213 	ERROR( "Unable to open '%s': %s", filename, strerror(errno) );
   214 	return FALSE;
   215     }
   217     result = dreamcast_load_config_stream( f );
   218     fclose(f);
   219     return result;
   220 }
   222 gboolean dreamcast_load_config_stream( FILE *f )
   223 {
   225     char buf[512], *p;
   226     int maple_device = -1, maple_subdevice = -1;
   227     struct dreamcast_config_group devgroup;
   228     struct dreamcast_config_group *group = NULL;
   229     maple_device_t device = NULL;
   230     dreamcast_set_default_config();
   232     while( fgets( buf, sizeof(buf), f ) != NULL ) {
   233 	g_strstrip(buf);
   234 	if( buf[0] == '#' )
   235 	    continue;
   236 	if( *buf == '[' ) {
   237 	    char *p = strchr(buf, ']');
   238 	    if( p != NULL ) {
   239 		struct dreamcast_config_group *tmp_group;
   240 		maple_device = maple_subdevice = -1;
   241 		*p = '\0';
   242 		g_strstrip(buf+1);
   243 		tmp_group = &dreamcast_config_root[0];
   244 		while( tmp_group->key != NULL ) {
   245 		    if( strcasecmp(tmp_group->key, buf+1) == 0 ) {
   246 			group = tmp_group;
   247 			break;
   248 		    }
   249 		    tmp_group++;
   250 		}
   251 	    }
   252 	} else if( group != NULL ) {
   253 	    char *value = strchr( buf, '=' );
   254 	    if( value != NULL ) {
   255 		struct dreamcast_config_entry *param = group->params;
   256 		*value = '\0';
   257 		value++;
   258 		g_strstrip(buf);
   259 		g_strstrip(value);
   260 		if( strcmp(group->key,"controllers") == 0  ) {
   261 		    if( g_strncasecmp( buf, "device ", 7 ) == 0 ) {
   262 			maple_device = strtoul( buf+7, NULL, 0 );
   263 			if( maple_device < 0 || maple_device > 3 ) {
   264 			    ERROR( "Device number must be between 0..3 (not '%s')", buf+7);
   265 			    continue;
   266 			}
   267 			maple_subdevice = 0;
   268 			device = maple_new_device( value );
   269 			if( device == NULL ) {
   270 			    ERROR( "Unrecognized device '%s'", value );
   271 			} else {
   272 			    devgroup.key = "controllers";
   273 			    devgroup.params = maple_get_device_config(device);
   274 			    maple_attach_device( device, maple_device, maple_subdevice );
   275 			    group = &devgroup;
   276 			}
   277 			continue;
   278 		    } else if( g_strncasecmp( buf, "subdevice ", 10 ) == 0 ) {
   279 			maple_subdevice = strtoul( buf+10, NULL, 0 );
   280 			if( maple_device == -1 ) {
   281 			    ERROR( "Subdevice not allowed without primary device" );
   282 			} else if( maple_subdevice < 1 || maple_subdevice > 5 ) {
   283 			    ERROR( "Subdevice must be between 1..5 (not '%s')", buf+10 );
   284 			} else if( (device = maple_new_device(value)) == NULL ) {
   285 			    ERROR( "Unrecognized subdevice '%s'", value );
   286 			} else {
   287 			    devgroup.key = "controllers";
   288 			    devgroup.params = maple_get_device_config(device);
   289 			    maple_attach_device( device, maple_device, maple_subdevice );
   290 			    group = &devgroup;
   291 			}
   292 			continue;
   293 		    }
   294 		}
   295 		while( param->key != NULL ) {
   296 		    if( strcasecmp( param->key, buf ) == 0 ) {
   297 			param->value = g_strdup(value);
   298 			break;
   299 		    }
   300 		    param++;
   301 		}
   302 	    }
   303 	}
   304     }
   305     return TRUE;
   306 }
   308 gboolean dreamcast_save_config( const gchar *filename )
   309 {
   310     FILE *f = fopen(filename, "wo");
   311     gboolean result;
   312     if( f == NULL ) {
   313 	ERROR( "Unable to open '%s': %s", filename, strerror(errno) );
   314 	return FALSE;
   315     }
   316     result = dreamcast_save_config_stream(f);
   317     fclose(f);
   318 }    
   320 gboolean dreamcast_save_config_stream( FILE *f )
   321 {
   322     struct dreamcast_config_group *group = &dreamcast_config_root[0];
   324     while( group->key != NULL ) {
   325 	struct dreamcast_config_entry *entry = group->params;
   326 	fprintf( f, "[%s]\n", group->key );
   328 	if( entry != NULL ) {
   329 	    while( entry->key != NULL ) {
   330 		fprintf( f, "%s = %s\n", entry->key, entry->value );
   331 		entry++;
   332 	    }
   333 	} else if( strcmp(group->key, "controllers") == 0 ) {
   334 	    int i,j;
   335 	    for( i=0; i<4; i++ ) {
   336 		for( j=0; j<6; j++ ) {
   337 		    maple_device_t dev = maple_get_device( i, j );
   338 		    if( dev != NULL ) {
   339 			if( j == 0 )
   340 			    fprintf( f, "Device %d = %s\n", i, dev->device_class->name );
   341 			else 
   342 			    fprintf( f, "Subdevice %d = %s\n", j, dev->device_class->name );
   343 			entry = dev->get_config(dev);
   344 			while( entry->key != NULL ) {
   345 			    fprintf( f, "%*c%s = %s\n", j==0?4:8, ' ',entry->key, entry->value );
   346 			    entry++;
   347 			}
   348 		    }
   349 		}
   350 	    }
   351 	}
   352 	fprintf( f, "\n" );
   353 	group++;
   354     }
   355     return TRUE;
   356 }
   358 /********************************* Save States *****************************/
   360 #define DREAMCAST_SAVE_MAGIC "%!-lxDream!Save\0"
   361 #define DREAMCAST_SAVE_VERSION 0x00010000
   363 struct save_state_header {
   364     char magic[16];
   365     uint32_t version;
   366     uint32_t module_count;
   367 };
   369 int dreamcast_load_state( const gchar *filename )
   370 {
   371     int i,j;
   372     uint32_t count, len;
   373     int have_read[MAX_MODULES];
   374     char tmp[64];
   375     struct save_state_header header;
   376     FILE *f;
   378     f = fopen( filename, "r" );
   379     if( f == NULL ) return errno;
   381     fread( &header, sizeof(header), 1, f );
   382     if( strncmp( header.magic, DREAMCAST_SAVE_MAGIC, 16 ) != 0 ) {
   383 	ERROR( "Not a %s save state file", APP_NAME );
   384 	return 1;
   385     }
   386     if( header.version != DREAMCAST_SAVE_VERSION ) {
   387 	ERROR( "%s save state version not supported", APP_NAME );
   388 	return 1;
   389     }
   390     if( header.module_count > MAX_MODULES ) {
   391 	ERROR( "%s save state is corrupted (bad module count)", APP_NAME );
   392 	return 1;
   393     }
   394     for( i=0; i<MAX_MODULES; i++ ) {
   395 	have_read[i] = 0;
   396     }
   398     for( i=0; i<header.module_count; i++ ) {
   399 	fread(tmp, 4, 1, f );
   400 	if( strncmp(tmp, "BLCK", 4) != 0 ) {
   401 	    ERROR( "%s save state is corrupted (missing block header %d)", APP_NAME, i );
   402 	    return 2;
   403 	}
   404 	len = fread_string(tmp, sizeof(tmp), f );
   405 	if( len > 64 || len < 1 ) {
   406 	    ERROR( "%s save state is corrupted (bad string)", APP_NAME );
   407 	    return 2;
   408 	}
   410 	/* Find the matching module by name */
   411 	for( j=0; j<num_modules; j++ ) {
   412 	    if( strcmp(modules[j]->name,tmp) == 0 ) {
   413 		have_read[j] = 1;
   414 		if( modules[j]->load == NULL ) {
   415 		    ERROR( "%s save state is corrupted (no loader for %s)", APP_NAME, modules[j]->name );
   416 		    return 2;
   417 		} else if( modules[j]->load(f) != 0 ) {
   418 		    ERROR( "%s save state is corrupted (%s failed)", APP_NAME, modules[j]->name );
   419 		    return 2;
   420 		}
   421 		break;
   422 	    }
   423 	}
   424 	if( j == num_modules ) {
   425 	    ERROR( "%s save state contains unrecognized section", APP_NAME );
   426 	    return 2;
   427 	}
   428     }
   430     /* Any modules that we didn't load - reset to the default state.
   431      * (ie it's not an error to skip a module if you don't actually
   432      * care about its state).
   433      */
   434     for( j=0; j<num_modules; j++ ) {
   435 	if( have_read[j] == 0 && modules[j]->reset != NULL ) {
   436 	    modules[j]->reset();
   437 	}
   438     }
   439     fclose(f);
   440     INFO( "Save state read from %s", filename );
   441 }
   443 int dreamcast_save_state( const gchar *filename )
   444 {
   445     int i;
   446     FILE *f;
   447     struct save_state_header header;
   449     f = fopen( filename, "w" );
   450     if( f == NULL )
   451 	return errno;
   452     strcpy( header.magic, DREAMCAST_SAVE_MAGIC );
   453     header.version = DREAMCAST_SAVE_VERSION;
   454     header.module_count = 0;
   456     for( i=0; i<num_modules; i++ ) {
   457 	if( modules[i]->save != NULL )
   458 	    header.module_count++;
   459     }
   460     fwrite( &header, sizeof(header), 1, f );
   461     for( i=0; i<num_modules; i++ ) {
   462 	if( modules[i]->save != NULL ) {
   463 	    fwrite( "BLCK", 4, 1, f );
   464 	    fwrite_string( modules[i]->name, f );
   465 	    modules[i]->save(f);
   466 	}
   467     }
   468     fclose( f );
   469     INFO( "Save state written to %s", filename );
   470 }
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