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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 144:7f0714e89aaa
prev89:939afb9f0f98
next146:f91fa34ab219
author nkeynes
date Mon May 15 08:28:52 2006 +0000 (15 years ago)
permissions -rw-r--r--
last change Rename video_driver to display_driver
Add input source to display
Implement configuration file support
Hook controllers up to configuration
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     1 /**
     2  * $Id: dreamcast.c,v 1.15 2006-05-15 08:28:48 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_ram_region( 0x0C000000, 16 MB, MEM_REGION_MAIN );
    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     mem_load_rom( "dcboot.rom", 0x00000000, 0x00200000, 0x89f2b1a1 );
    70     mem_load_rom( "dcflash.rom",0x00200000, 0x00020000, 0x357c3568 );
    72     /* Load in the rest of the core modules */
    73     dreamcast_register_module( &sh4_module );
    74     dreamcast_register_module( &asic_module );
    75     dreamcast_register_module( &pvr2_module );
    76     dreamcast_register_module( &aica_module );
    77     dreamcast_register_module( &maple_module );
    78     dreamcast_register_module( &ide_module );
    80     /* Attach any default maple devices, ie a pair of controllers */
    81     /*
    82     maple_device_t controller1 = maple_new_device("Sega Controller");
    83     maple_device_t controller2 = maple_new_device("Sega Controller");
    84     maple_attach_device( controller1, 0, 0 );
    85     maple_attach_device( controller2, 1, 0 );
    86     */
    87 }
    89 /**
    90  * Constructs a system configuration for the AICA in standalone mode,
    91  * ie sound chip only.
    92  */
    93 void dreamcast_configure_aica_only( )
    94 {
    95     dreamcast_register_module( &mem_module );
    96     mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
    97     mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
    98     dreamcast_register_module( &aica_module );
    99     aica_enable();
   100     dreamcast_state = STATE_STOPPED;
   101 }
   103 void dreamcast_register_module( dreamcast_module_t module ) 
   104 {
   105     modules[num_modules++] = module;
   106     if( module->init != NULL )
   107 	module->init();
   108 }
   111 void dreamcast_init( void )
   112 {
   113     dreamcast_configure();
   114     dreamcast_state = STATE_STOPPED;
   115 }
   117 void dreamcast_reset( void )
   118 {
   119     int i;
   120     for( i=0; i<num_modules; i++ ) {
   121 	if( modules[i]->reset != NULL )
   122 	    modules[i]->reset();
   123     }
   124 }
   126 void dreamcast_run( void )
   127 {
   128     int i;
   129     if( dreamcast_state != STATE_RUNNING ) {
   130 	for( i=0; i<num_modules; i++ ) {
   131 	    if( modules[i]->start != NULL )
   132 		modules[i]->start();
   133 	}
   134     }
   135     dreamcast_state = STATE_RUNNING;
   136     while( dreamcast_state == STATE_RUNNING ) {
   137 	int time_to_run = timeslice_length;
   138 	for( i=0; i<num_modules; i++ ) {
   139 	    if( modules[i]->run_time_slice != NULL )
   140 		time_to_run = modules[i]->run_time_slice( time_to_run );
   141 	}
   143     }
   145     for( i=0; i<num_modules; i++ ) {
   146 	if( modules[i]->stop != NULL )
   147 	    modules[i]->stop();
   148     }
   149     dreamcast_state = STATE_STOPPED;
   150 }
   152 void dreamcast_stop( void )
   153 {
   154     if( dreamcast_state == STATE_RUNNING )
   155 	dreamcast_state = STATE_STOPPING;
   156 }
   158 gboolean dreamcast_is_running( void )
   159 {
   160     return dreamcast_state == STATE_RUNNING;
   161 }
   163 /***************************** User Configuration **************************/
   165 static struct dreamcast_config_entry global_config[] =
   166     {{ "bios", CONFIG_TYPE_FILE, "dcboot.rom" },
   167      { "flash", CONFIG_TYPE_FILE, "dcflash.rom" },
   168      { "default path", CONFIG_TYPE_PATH, "." },
   169      { "save path", CONFIG_TYPE_PATH, "save" },
   170      { "bootstrap", CONFIG_TYPE_FILE, "IP.BIN" },
   171      { NULL, CONFIG_TYPE_NONE }};
   173 static struct dreamcast_config_entry serial_config[] =
   174     {{ "device", CONFIG_TYPE_FILE, "/dev/ttyS1" },
   175      { NULL, CONFIG_TYPE_NONE }};
   177 struct dreamcast_config_group dreamcast_config_root[] = 
   178     {{ "global", global_config },
   179      { "controllers", NULL },
   180      { "serial", serial_config },
   181      { NULL, CONFIG_TYPE_NONE }};
   183 void dreamcast_set_default_config( )
   184 {
   185     struct dreamcast_config_group *group = dreamcast_config_root;
   186     while( group->key != NULL ) {
   187 	struct dreamcast_config_entry *param = group->params;
   188 	if( param != NULL ) {
   189 	    while( param->key != NULL ) {
   190 		if( param->value != param->default_value ) {
   191 		    if( param->value != NULL )
   192 			free( param->value );
   193 		    param->value = (gchar *)param->default_value;
   194 		}
   195 		param++;
   196 	    }
   197 	}
   198 	group++;
   199     }
   200     maple_detach_all();
   201 }
   203 gboolean dreamcast_load_config( const gchar *filename )
   204 {
   205     FILE *f = fopen(filename, "ro");
   206     gboolean result;
   208     if( f == NULL ) {
   209 	ERROR( "Unable to open '%s': %s", filename, strerror(errno) );
   210 	return FALSE;
   211     }
   213     result = dreamcast_load_config_stream( f );
   214     fclose(f);
   215     return result;
   216 }
   218 gboolean dreamcast_load_config_stream( FILE *f )
   219 {
   221     char buf[512], *p;
   222     int maple_device = -1, maple_subdevice = -1;
   223     struct dreamcast_config_group devgroup;
   224     struct dreamcast_config_group *group = NULL;
   225     maple_device_t device = NULL;
   226     dreamcast_set_default_config();
   228     while( fgets( buf, sizeof(buf), f ) != NULL ) {
   229 	g_strstrip(buf);
   230 	if( buf[0] == '#' )
   231 	    continue;
   232 	if( *buf == '[' ) {
   233 	    char *p = strchr(buf, ']');
   234 	    if( p != NULL ) {
   235 		struct dreamcast_config_group *tmp_group;
   236 		maple_device = maple_subdevice = -1;
   237 		*p = '\0';
   238 		g_strstrip(buf+1);
   239 		tmp_group = &dreamcast_config_root[0];
   240 		while( tmp_group->key != NULL ) {
   241 		    if( strcasecmp(tmp_group->key, buf+1) == 0 ) {
   242 			group = tmp_group;
   243 			break;
   244 		    }
   245 		    tmp_group++;
   246 		}
   247 	    }
   248 	} else if( group != NULL ) {
   249 	    char *value = strchr( buf, '=' );
   250 	    if( value != NULL ) {
   251 		struct dreamcast_config_entry *param = group->params;
   252 		*value = '\0';
   253 		value++;
   254 		g_strstrip(buf);
   255 		g_strstrip(value);
   256 		if( strcmp(group->key,"controllers") == 0  ) {
   257 		    if( g_strncasecmp( buf, "device ", 7 ) == 0 ) {
   258 			maple_device = strtoul( buf+7, NULL, 0 );
   259 			if( maple_device < 0 || maple_device > 3 ) {
   260 			    ERROR( "Device number must be between 0..3 (not '%s')", buf+7);
   261 			    continue;
   262 			}
   263 			maple_subdevice = 0;
   264 			device = maple_new_device( value );
   265 			if( device == NULL ) {
   266 			    ERROR( "Unrecognized device '%s'", value );
   267 			} else {
   268 			    devgroup.key = "controllers";
   269 			    devgroup.params = maple_get_device_config(device);
   270 			    maple_attach_device( device, maple_device, maple_subdevice );
   271 			    group = &devgroup;
   272 			}
   273 			continue;
   274 		    } else if( g_strncasecmp( buf, "subdevice ", 10 ) == 0 ) {
   275 			maple_subdevice = strtoul( buf+10, NULL, 0 );
   276 			if( maple_device == -1 ) {
   277 			    ERROR( "Subdevice not allowed without primary device" );
   278 			} else if( maple_subdevice < 1 || maple_subdevice > 5 ) {
   279 			    ERROR( "Subdevice must be between 1..5 (not '%s')", buf+10 );
   280 			} else if( (device = maple_new_device(value)) == NULL ) {
   281 			    ERROR( "Unrecognized subdevice '%s'", value );
   282 			} else {
   283 			    devgroup.key = "controllers";
   284 			    devgroup.params = maple_get_device_config(device);
   285 			    maple_attach_device( device, maple_device, maple_subdevice );
   286 			    group = &devgroup;
   287 			}
   288 			continue;
   289 		    }
   290 		}
   291 		while( param->key != NULL ) {
   292 		    if( strcasecmp( param->key, buf ) == 0 ) {
   293 			param->value = g_strdup(value);
   294 			break;
   295 		    }
   296 		    param++;
   297 		}
   298 	    }
   299 	}
   300     }
   301     return TRUE;
   302 }
   304 gboolean dreamcast_save_config( const gchar *filename )
   305 {
   306     FILE *f = fopen(filename, "wo");
   307     gboolean result;
   308     if( f == NULL ) {
   309 	ERROR( "Unable to open '%s': %s", filename, strerror(errno) );
   310 	return FALSE;
   311     }
   312     result = dreamcast_save_config_stream(f);
   313     fclose(f);
   314 }    
   316 gboolean dreamcast_save_config_stream( FILE *f )
   317 {
   318     struct dreamcast_config_group *group = &dreamcast_config_root[0];
   320     while( group->key != NULL ) {
   321 	struct dreamcast_config_entry *entry = group->params;
   322 	fprintf( f, "[%s]\n", group->key );
   324 	if( entry != NULL ) {
   325 	    while( entry->key != NULL ) {
   326 		fprintf( f, "%s = %s\n", entry->key, entry->value );
   327 		entry++;
   328 	    }
   329 	} else if( strcmp(group->key, "controllers") == 0 ) {
   330 	    int i,j;
   331 	    for( i=0; i<4; i++ ) {
   332 		for( j=0; j<6; j++ ) {
   333 		    maple_device_t dev = maple_get_device( i, j );
   334 		    if( dev != NULL ) {
   335 			if( j == 0 )
   336 			    fprintf( f, "Device %d = %s\n", i, dev->device_class->name );
   337 			else 
   338 			    fprintf( f, "Subdevice %d = %s\n", j, dev->device_class->name );
   339 			entry = dev->get_config(dev);
   340 			while( entry->key != NULL ) {
   341 			    fprintf( f, "%*c%s = %s\n", j==0?4:8, ' ',entry->key, entry->value );
   342 			    entry++;
   343 			}
   344 		    }
   345 		}
   346 	    }
   347 	}
   348 	fprintf( f, "\n" );
   349 	group++;
   350     }
   351     return TRUE;
   352 }
   354 /********************************* Save States *****************************/
   356 #define DREAMCAST_SAVE_MAGIC "%!-DreamOn!Save\0"
   357 #define DREAMCAST_SAVE_VERSION 0x00010000
   359 struct save_state_header {
   360     char magic[16];
   361     uint32_t version;
   362     uint32_t module_count;
   363 };
   365 int dreamcast_load_state( const gchar *filename )
   366 {
   367     int i,j;
   368     uint32_t count, len;
   369     int have_read[MAX_MODULES];
   370     char tmp[64];
   371     struct save_state_header header;
   372     FILE *f;
   374     f = fopen( filename, "r" );
   375     if( f == NULL ) return errno;
   377     fread( &header, sizeof(header), 1, f );
   378     if( strncmp( header.magic, DREAMCAST_SAVE_MAGIC, 16 ) != 0 ) {
   379 	ERROR( "Not a DreamOn save state file" );
   380 	return 1;
   381     }
   382     if( header.version != DREAMCAST_SAVE_VERSION ) {
   383 	ERROR( "DreamOn save state version not supported" );
   384 	return 1;
   385     }
   386     if( header.module_count > MAX_MODULES ) {
   387 	ERROR( "DreamOn save state is corrupted (bad module count)" );
   388 	return 1;
   389     }
   390     for( i=0; i<MAX_MODULES; i++ ) {
   391 	have_read[i] = 0;
   392     }
   394     for( i=0; i<header.module_count; i++ ) {
   395 	fread(tmp, 4, 1, f );
   396 	if( strncmp(tmp, "BLCK", 4) != 0 ) {
   397 	    ERROR( "DreamOn save state is corrupted (missing block header %d)", i );
   398 	    return 2;
   399 	}
   400 	len = fread_string(tmp, sizeof(tmp), f );
   401 	if( len > 64 || len < 1 ) {
   402 	    ERROR( "DreamOn save state is corrupted (bad string)" );
   403 	    return 2;
   404 	}
   406 	/* Find the matching module by name */
   407 	for( j=0; j<num_modules; j++ ) {
   408 	    if( strcmp(modules[j]->name,tmp) == 0 ) {
   409 		have_read[j] = 1;
   410 		if( modules[j]->load == NULL ) {
   411 		    ERROR( "DreamOn save state is corrupted (no loader for %s)", modules[j]->name );
   412 		    return 2;
   413 		} else if( modules[j]->load(f) != 0 ) {
   414 		    ERROR( "DreamOn save state is corrupted (%s failed)", modules[j]->name );
   415 		    return 2;
   416 		}
   417 		break;
   418 	    }
   419 	}
   420 	if( j == num_modules ) {
   421 	    ERROR( "DreamOn save state contains unrecognized section" );
   422 	    return 2;
   423 	}
   424     }
   426     /* Any modules that we didn't load - reset to the default state.
   427      * (ie it's not an error to skip a module if you don't actually
   428      * care about its state).
   429      */
   430     for( j=0; j<num_modules; j++ ) {
   431 	if( have_read[j] == 0 && modules[j]->reset != NULL ) {
   432 	    modules[j]->reset();
   433 	}
   434     }
   435     fclose(f);
   436     INFO( "Save state read from %s", filename );
   437 }
   439 int dreamcast_save_state( const gchar *filename )
   440 {
   441     int i;
   442     FILE *f;
   443     struct save_state_header header;
   445     f = fopen( filename, "w" );
   446     if( f == NULL )
   447 	return errno;
   448     strcpy( header.magic, DREAMCAST_SAVE_MAGIC );
   449     header.version = DREAMCAST_SAVE_VERSION;
   450     header.module_count = 0;
   452     for( i=0; i<num_modules; i++ ) {
   453 	if( modules[i]->save != NULL )
   454 	    header.module_count++;
   455     }
   456     fwrite( &header, sizeof(header), 1, f );
   457     for( i=0; i<num_modules; i++ ) {
   458 	if( modules[i]->save != NULL ) {
   459 	    fwrite( "BLCK", 4, 1, f );
   460 	    fwrite_string( modules[i]->name, f );
   461 	    modules[i]->save(f);
   462 	}
   463     }
   464     fclose( f );
   465     INFO( "Save state written to %s", filename );
   466 }
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