Search
lxdream.org :: lxdream/src/dreamcast.c
lxdream 0.9.1
released Jun 29
Download Now
filename src/dreamcast.c
changeset 167:71c0cc416a64
prev146:f91fa34ab219
next180:e6dcf9b65658
author nkeynes
date Tue Jun 27 09:34:27 2006 +0000 (16 years ago)
permissions -rw-r--r--
last change Update for change to bootstrap dumper
view annotate diff log raw
     1 /**
     2  * $Id: dreamcast.c,v 1.17 2006-06-19 11:00:40 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     mem_load_rom( dreamcast_get_config_value(CONFIG_BIOS_PATH),
    70 		  0x00000000, 0x00200000, 0x89f2b1a1 );
    71     mem_create_ram_region( 0x00200000, 0x00020000, MEM_REGION_FLASH );
    72     mem_load_block( dreamcast_get_config_value(CONFIG_FLASH_PATH),
    73 		    0x00200000, 0x00020000 );
    75     /* Load in the rest of the core modules */
    76     dreamcast_register_module( &sh4_module );
    77     dreamcast_register_module( &asic_module );
    78     dreamcast_register_module( &pvr2_module );
    79     dreamcast_register_module( &aica_module );
    80     dreamcast_register_module( &maple_module );
    81     dreamcast_register_module( &ide_module );
    82 }
    84 /**
    85  * Constructs a system configuration for the AICA in standalone mode,
    86  * ie sound chip only.
    87  */
    88 void dreamcast_configure_aica_only( )
    89 {
    90     dreamcast_register_module( &mem_module );
    91     mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
    92     mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
    93     dreamcast_register_module( &aica_module );
    94     aica_enable();
    95     dreamcast_state = STATE_STOPPED;
    96 }
    98 void dreamcast_register_module( dreamcast_module_t module ) 
    99 {
   100     modules[num_modules++] = module;
   101     if( module->init != NULL )
   102 	module->init();
   103 }
   106 void dreamcast_init( void )
   107 {
   108     dreamcast_configure();
   109     dreamcast_state = STATE_STOPPED;
   110 }
   112 void dreamcast_reset( void )
   113 {
   114     int i;
   115     for( i=0; i<num_modules; i++ ) {
   116 	if( modules[i]->reset != NULL )
   117 	    modules[i]->reset();
   118     }
   119 }
   121 void dreamcast_run( void )
   122 {
   123     int i;
   124     if( dreamcast_state != STATE_RUNNING ) {
   125 	for( i=0; i<num_modules; i++ ) {
   126 	    if( modules[i]->start != NULL )
   127 		modules[i]->start();
   128 	}
   129     }
   130     dreamcast_state = STATE_RUNNING;
   131     while( dreamcast_state == STATE_RUNNING ) {
   132 	int time_to_run = timeslice_length;
   133 	for( i=0; i<num_modules; i++ ) {
   134 	    if( modules[i]->run_time_slice != NULL )
   135 		time_to_run = modules[i]->run_time_slice( time_to_run );
   136 	}
   138     }
   140     for( i=0; i<num_modules; i++ ) {
   141 	if( modules[i]->stop != NULL )
   142 	    modules[i]->stop();
   143     }
   144     dreamcast_state = STATE_STOPPED;
   145 }
   147 void dreamcast_stop( void )
   148 {
   149     if( dreamcast_state == STATE_RUNNING )
   150 	dreamcast_state = STATE_STOPPING;
   151 }
   153 gboolean dreamcast_is_running( void )
   154 {
   155     return dreamcast_state == STATE_RUNNING;
   156 }
   158 /***************************** User Configuration **************************/
   161 static struct dreamcast_config_entry global_config[] =
   162     {{ "bios", CONFIG_TYPE_FILE, "dcboot.rom" },
   163      { "flash", CONFIG_TYPE_FILE, "dcflash.rom" },
   164      { "default path", CONFIG_TYPE_PATH, "." },
   165      { "save path", CONFIG_TYPE_PATH, "save" },
   166      { "bootstrap", CONFIG_TYPE_FILE, "IP.BIN" },
   167      { NULL, CONFIG_TYPE_NONE }};
   169 static struct dreamcast_config_entry serial_config[] =
   170     {{ "device", CONFIG_TYPE_FILE, "/dev/ttyS1" },
   171      { NULL, CONFIG_TYPE_NONE }};
   173 struct dreamcast_config_group dreamcast_config_root[] = 
   174     {{ "global", global_config },
   175      { "controllers", NULL },
   176      { "serial", serial_config },
   177      { NULL, CONFIG_TYPE_NONE }};
   179 void dreamcast_set_default_config( )
   180 {
   181     struct dreamcast_config_group *group = dreamcast_config_root;
   182     while( group->key != NULL ) {
   183 	struct dreamcast_config_entry *param = group->params;
   184 	if( param != NULL ) {
   185 	    while( param->key != NULL ) {
   186 		if( param->value != param->default_value ) {
   187 		    if( param->value != NULL )
   188 			free( param->value );
   189 		    param->value = (gchar *)param->default_value;
   190 		}
   191 		param++;
   192 	    }
   193 	}
   194 	group++;
   195     }
   196     maple_detach_all();
   197 }
   199 const gchar *dreamcast_get_config_value( int key )
   200 {
   201     return global_config[key].value;
   202 }
   204 gboolean dreamcast_load_config( const gchar *filename )
   205 {
   206     FILE *f = fopen(filename, "ro");
   207     gboolean result;
   209     if( f == NULL ) {
   210 	ERROR( "Unable to open '%s': %s", filename, strerror(errno) );
   211 	return FALSE;
   212     }
   214     result = dreamcast_load_config_stream( f );
   215     fclose(f);
   216     return result;
   217 }
   219 gboolean dreamcast_load_config_stream( FILE *f )
   220 {
   222     char buf[512], *p;
   223     int maple_device = -1, maple_subdevice = -1;
   224     struct dreamcast_config_group devgroup;
   225     struct dreamcast_config_group *group = NULL;
   226     maple_device_t device = NULL;
   227     dreamcast_set_default_config();
   229     while( fgets( buf, sizeof(buf), f ) != NULL ) {
   230 	g_strstrip(buf);
   231 	if( buf[0] == '#' )
   232 	    continue;
   233 	if( *buf == '[' ) {
   234 	    char *p = strchr(buf, ']');
   235 	    if( p != NULL ) {
   236 		struct dreamcast_config_group *tmp_group;
   237 		maple_device = maple_subdevice = -1;
   238 		*p = '\0';
   239 		g_strstrip(buf+1);
   240 		tmp_group = &dreamcast_config_root[0];
   241 		while( tmp_group->key != NULL ) {
   242 		    if( strcasecmp(tmp_group->key, buf+1) == 0 ) {
   243 			group = tmp_group;
   244 			break;
   245 		    }
   246 		    tmp_group++;
   247 		}
   248 	    }
   249 	} else if( group != NULL ) {
   250 	    char *value = strchr( buf, '=' );
   251 	    if( value != NULL ) {
   252 		struct dreamcast_config_entry *param = group->params;
   253 		*value = '\0';
   254 		value++;
   255 		g_strstrip(buf);
   256 		g_strstrip(value);
   257 		if( strcmp(group->key,"controllers") == 0  ) {
   258 		    if( g_strncasecmp( buf, "device ", 7 ) == 0 ) {
   259 			maple_device = strtoul( buf+7, NULL, 0 );
   260 			if( maple_device < 0 || maple_device > 3 ) {
   261 			    ERROR( "Device number must be between 0..3 (not '%s')", buf+7);
   262 			    continue;
   263 			}
   264 			maple_subdevice = 0;
   265 			device = maple_new_device( value );
   266 			if( device == NULL ) {
   267 			    ERROR( "Unrecognized device '%s'", value );
   268 			} else {
   269 			    devgroup.key = "controllers";
   270 			    devgroup.params = maple_get_device_config(device);
   271 			    maple_attach_device( device, maple_device, maple_subdevice );
   272 			    group = &devgroup;
   273 			}
   274 			continue;
   275 		    } else if( g_strncasecmp( buf, "subdevice ", 10 ) == 0 ) {
   276 			maple_subdevice = strtoul( buf+10, NULL, 0 );
   277 			if( maple_device == -1 ) {
   278 			    ERROR( "Subdevice not allowed without primary device" );
   279 			} else if( maple_subdevice < 1 || maple_subdevice > 5 ) {
   280 			    ERROR( "Subdevice must be between 1..5 (not '%s')", buf+10 );
   281 			} else if( (device = maple_new_device(value)) == NULL ) {
   282 			    ERROR( "Unrecognized subdevice '%s'", value );
   283 			} else {
   284 			    devgroup.key = "controllers";
   285 			    devgroup.params = maple_get_device_config(device);
   286 			    maple_attach_device( device, maple_device, maple_subdevice );
   287 			    group = &devgroup;
   288 			}
   289 			continue;
   290 		    }
   291 		}
   292 		while( param->key != NULL ) {
   293 		    if( strcasecmp( param->key, buf ) == 0 ) {
   294 			param->value = g_strdup(value);
   295 			break;
   296 		    }
   297 		    param++;
   298 		}
   299 	    }
   300 	}
   301     }
   302     return TRUE;
   303 }
   305 gboolean dreamcast_save_config( const gchar *filename )
   306 {
   307     FILE *f = fopen(filename, "wo");
   308     gboolean result;
   309     if( f == NULL ) {
   310 	ERROR( "Unable to open '%s': %s", filename, strerror(errno) );
   311 	return FALSE;
   312     }
   313     result = dreamcast_save_config_stream(f);
   314     fclose(f);
   315 }    
   317 gboolean dreamcast_save_config_stream( FILE *f )
   318 {
   319     struct dreamcast_config_group *group = &dreamcast_config_root[0];
   321     while( group->key != NULL ) {
   322 	struct dreamcast_config_entry *entry = group->params;
   323 	fprintf( f, "[%s]\n", group->key );
   325 	if( entry != NULL ) {
   326 	    while( entry->key != NULL ) {
   327 		fprintf( f, "%s = %s\n", entry->key, entry->value );
   328 		entry++;
   329 	    }
   330 	} else if( strcmp(group->key, "controllers") == 0 ) {
   331 	    int i,j;
   332 	    for( i=0; i<4; i++ ) {
   333 		for( j=0; j<6; j++ ) {
   334 		    maple_device_t dev = maple_get_device( i, j );
   335 		    if( dev != NULL ) {
   336 			if( j == 0 )
   337 			    fprintf( f, "Device %d = %s\n", i, dev->device_class->name );
   338 			else 
   339 			    fprintf( f, "Subdevice %d = %s\n", j, dev->device_class->name );
   340 			entry = dev->get_config(dev);
   341 			while( entry->key != NULL ) {
   342 			    fprintf( f, "%*c%s = %s\n", j==0?4:8, ' ',entry->key, entry->value );
   343 			    entry++;
   344 			}
   345 		    }
   346 		}
   347 	    }
   348 	}
   349 	fprintf( f, "\n" );
   350 	group++;
   351     }
   352     return TRUE;
   353 }
   355 /********************************* Save States *****************************/
   357 #define DREAMCAST_SAVE_MAGIC "%!-DreamOn!Save\0"
   358 #define DREAMCAST_SAVE_VERSION 0x00010000
   360 struct save_state_header {
   361     char magic[16];
   362     uint32_t version;
   363     uint32_t module_count;
   364 };
   366 int dreamcast_load_state( const gchar *filename )
   367 {
   368     int i,j;
   369     uint32_t count, len;
   370     int have_read[MAX_MODULES];
   371     char tmp[64];
   372     struct save_state_header header;
   373     FILE *f;
   375     f = fopen( filename, "r" );
   376     if( f == NULL ) return errno;
   378     fread( &header, sizeof(header), 1, f );
   379     if( strncmp( header.magic, DREAMCAST_SAVE_MAGIC, 16 ) != 0 ) {
   380 	ERROR( "Not a DreamOn save state file" );
   381 	return 1;
   382     }
   383     if( header.version != DREAMCAST_SAVE_VERSION ) {
   384 	ERROR( "DreamOn save state version not supported" );
   385 	return 1;
   386     }
   387     if( header.module_count > MAX_MODULES ) {
   388 	ERROR( "DreamOn save state is corrupted (bad module count)" );
   389 	return 1;
   390     }
   391     for( i=0; i<MAX_MODULES; i++ ) {
   392 	have_read[i] = 0;
   393     }
   395     for( i=0; i<header.module_count; i++ ) {
   396 	fread(tmp, 4, 1, f );
   397 	if( strncmp(tmp, "BLCK", 4) != 0 ) {
   398 	    ERROR( "DreamOn save state is corrupted (missing block header %d)", i );
   399 	    return 2;
   400 	}
   401 	len = fread_string(tmp, sizeof(tmp), f );
   402 	if( len > 64 || len < 1 ) {
   403 	    ERROR( "DreamOn save state is corrupted (bad string)" );
   404 	    return 2;
   405 	}
   407 	/* Find the matching module by name */
   408 	for( j=0; j<num_modules; j++ ) {
   409 	    if( strcmp(modules[j]->name,tmp) == 0 ) {
   410 		have_read[j] = 1;
   411 		if( modules[j]->load == NULL ) {
   412 		    ERROR( "DreamOn save state is corrupted (no loader for %s)", modules[j]->name );
   413 		    return 2;
   414 		} else if( modules[j]->load(f) != 0 ) {
   415 		    ERROR( "DreamOn save state is corrupted (%s failed)", modules[j]->name );
   416 		    return 2;
   417 		}
   418 		break;
   419 	    }
   420 	}
   421 	if( j == num_modules ) {
   422 	    ERROR( "DreamOn save state contains unrecognized section" );
   423 	    return 2;
   424 	}
   425     }
   427     /* Any modules that we didn't load - reset to the default state.
   428      * (ie it's not an error to skip a module if you don't actually
   429      * care about its state).
   430      */
   431     for( j=0; j<num_modules; j++ ) {
   432 	if( have_read[j] == 0 && modules[j]->reset != NULL ) {
   433 	    modules[j]->reset();
   434 	}
   435     }
   436     fclose(f);
   437     INFO( "Save state read from %s", filename );
   438 }
   440 int dreamcast_save_state( const gchar *filename )
   441 {
   442     int i;
   443     FILE *f;
   444     struct save_state_header header;
   446     f = fopen( filename, "w" );
   447     if( f == NULL )
   448 	return errno;
   449     strcpy( header.magic, DREAMCAST_SAVE_MAGIC );
   450     header.version = DREAMCAST_SAVE_VERSION;
   451     header.module_count = 0;
   453     for( i=0; i<num_modules; i++ ) {
   454 	if( modules[i]->save != NULL )
   455 	    header.module_count++;
   456     }
   457     fwrite( &header, sizeof(header), 1, f );
   458     for( i=0; i<num_modules; i++ ) {
   459 	if( modules[i]->save != NULL ) {
   460 	    fwrite( "BLCK", 4, 1, f );
   461 	    fwrite_string( modules[i]->name, f );
   462 	    modules[i]->save(f);
   463 	}
   464     }
   465     fclose( f );
   466     INFO( "Save state written to %s", filename );
   467 }
.