lxdream 0.9.1| filename | src/dreamcast.c |
| changeset | 295:6637664291a8 |
| prev | 277:fcc1274776cb |
| next | 372:86aa060ddcec |
| author | nkeynes |
| date | Tue Jan 23 11:19:32 2007 +0000 (16 years ago) |
| permissions | -rw-r--r-- |
| last change | Refactor render buffer read/write to pvr2mem.c Implement 4-bit indexed textures (tentatively) Fix RGB24 support |
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1 /**
2 * $Id: dreamcast.c,v 1.21 2007-01-16 10:34:46 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 dreamcast_register_module( &eventq_module );
62 /* Register the memory framework */
63 dreamcast_register_module( &mem_module );
65 /* Setup standard memory map */
66 mem_create_repeating_ram_region( 0x0C000000, 16 MB, MEM_REGION_MAIN, 0x01000000, 0x0F000000 );
67 mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
68 mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
69 mem_create_ram_region( 0x05000000, 8 MB, MEM_REGION_VIDEO );
70 if( mem_load_rom( dreamcast_get_config_value(CONFIG_BIOS_PATH),
71 0x00000000, 0x00200000, 0x89f2b1a1 ) == NULL ) {
72 /* Bios wasn't found. Dump an empty ram region in there for something to do */
73 mem_create_ram_region( 0x00000000, 0x00200000, MEM_REGION_BIOS );
74 }
75 mem_create_ram_region( 0x00200000, 0x00020000, MEM_REGION_FLASH );
76 mem_load_block( dreamcast_get_config_value(CONFIG_FLASH_PATH),
77 0x00200000, 0x00020000 );
79 /* Load in the rest of the core modules */
80 dreamcast_register_module( &sh4_module );
81 dreamcast_register_module( &asic_module );
82 dreamcast_register_module( &pvr2_module );
83 dreamcast_register_module( &aica_module );
84 dreamcast_register_module( &maple_module );
85 dreamcast_register_module( &ide_module );
86 }
88 void dreamcast_save_flash()
89 {
90 char *file = dreamcast_get_config_value(CONFIG_FLASH_PATH);
91 mem_save_block( file, 0x00200000, 0x00020000 );
92 }
94 /**
95 * Constructs a system configuration for the AICA in standalone mode,
96 * ie sound chip only.
97 */
98 void dreamcast_configure_aica_only( )
99 {
100 dreamcast_register_module( &mem_module );
101 mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
102 mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
103 dreamcast_register_module( &aica_module );
104 aica_enable();
105 dreamcast_state = STATE_STOPPED;
106 }
108 void dreamcast_register_module( dreamcast_module_t module )
109 {
110 modules[num_modules++] = module;
111 if( module->init != NULL )
112 module->init();
113 }
116 void dreamcast_init( void )
117 {
118 dreamcast_configure();
119 dreamcast_state = STATE_STOPPED;
120 }
122 void dreamcast_reset( void )
123 {
124 int i;
125 for( i=0; i<num_modules; i++ ) {
126 if( modules[i]->reset != NULL )
127 modules[i]->reset();
128 }
129 }
131 void dreamcast_run( void )
132 {
133 int i;
134 if( dreamcast_state != STATE_RUNNING ) {
135 for( i=0; i<num_modules; i++ ) {
136 if( modules[i]->start != NULL )
137 modules[i]->start();
138 }
139 }
140 dreamcast_state = STATE_RUNNING;
141 while( dreamcast_state == STATE_RUNNING ) {
142 int time_to_run = timeslice_length;
143 for( i=0; i<num_modules; i++ ) {
144 if( modules[i]->run_time_slice != NULL )
145 time_to_run = modules[i]->run_time_slice( time_to_run );
146 }
148 }
150 for( i=0; i<num_modules; i++ ) {
151 if( modules[i]->stop != NULL )
152 modules[i]->stop();
153 }
154 dreamcast_state = STATE_STOPPED;
155 }
157 void dreamcast_stop( void )
158 {
159 if( dreamcast_state == STATE_RUNNING )
160 dreamcast_state = STATE_STOPPING;
161 }
163 void dreamcast_shutdown()
164 {
165 dreamcast_stop();
166 sh4_stop();
167 dreamcast_save_flash();
168 }
170 gboolean dreamcast_is_running( void )
171 {
172 return dreamcast_state == STATE_RUNNING;
173 }
175 /***************************** User Configuration **************************/
178 static struct dreamcast_config_entry global_config[] =
179 {{ "bios", CONFIG_TYPE_FILE, "dcboot.rom" },
180 { "flash", CONFIG_TYPE_FILE, "dcflash.rom" },
181 { "default path", CONFIG_TYPE_PATH, "." },
182 { "save path", CONFIG_TYPE_PATH, "save" },
183 { "bootstrap", CONFIG_TYPE_FILE, "IP.BIN" },
184 { NULL, CONFIG_TYPE_NONE }};
186 static struct dreamcast_config_entry serial_config[] =
187 {{ "device", CONFIG_TYPE_FILE, "/dev/ttyS1" },
188 { NULL, CONFIG_TYPE_NONE }};
190 struct dreamcast_config_group dreamcast_config_root[] =
191 {{ "global", global_config },
192 { "controllers", NULL },
193 { "serial", serial_config },
194 { NULL, CONFIG_TYPE_NONE }};
196 void dreamcast_set_default_config( )
197 {
198 struct dreamcast_config_group *group = dreamcast_config_root;
199 while( group->key != NULL ) {
200 struct dreamcast_config_entry *param = group->params;
201 if( param != NULL ) {
202 while( param->key != NULL ) {
203 if( param->value != param->default_value ) {
204 if( param->value != NULL )
205 free( param->value );
206 param->value = (gchar *)param->default_value;
207 }
208 param++;
209 }
210 }
211 group++;
212 }
213 maple_detach_all();
214 }
216 const gchar *dreamcast_get_config_value( int key )
217 {
218 return global_config[key].value;
219 }
221 gboolean dreamcast_load_config( const gchar *filename )
222 {
223 FILE *f = fopen(filename, "ro");
224 gboolean result;
226 if( f == NULL ) {
227 ERROR( "Unable to open '%s': %s", filename, strerror(errno) );
228 return FALSE;
229 }
231 result = dreamcast_load_config_stream( f );
232 fclose(f);
233 return result;
234 }
236 gboolean dreamcast_load_config_stream( FILE *f )
237 {
239 char buf[512], *p;
240 int maple_device = -1, maple_subdevice = -1;
241 struct dreamcast_config_group devgroup;
242 struct dreamcast_config_group *group = NULL;
243 maple_device_t device = NULL;
244 dreamcast_set_default_config();
246 while( fgets( buf, sizeof(buf), f ) != NULL ) {
247 g_strstrip(buf);
248 if( buf[0] == '#' )
249 continue;
250 if( *buf == '[' ) {
251 char *p = strchr(buf, ']');
252 if( p != NULL ) {
253 struct dreamcast_config_group *tmp_group;
254 maple_device = maple_subdevice = -1;
255 *p = '\0';
256 g_strstrip(buf+1);
257 tmp_group = &dreamcast_config_root[0];
258 while( tmp_group->key != NULL ) {
259 if( strcasecmp(tmp_group->key, buf+1) == 0 ) {
260 group = tmp_group;
261 break;
262 }
263 tmp_group++;
264 }
265 }
266 } else if( group != NULL ) {
267 char *value = strchr( buf, '=' );
268 if( value != NULL ) {
269 struct dreamcast_config_entry *param = group->params;
270 *value = '\0';
271 value++;
272 g_strstrip(buf);
273 g_strstrip(value);
274 if( strcmp(group->key,"controllers") == 0 ) {
275 if( g_strncasecmp( buf, "device ", 7 ) == 0 ) {
276 maple_device = strtoul( buf+7, NULL, 0 );
277 if( maple_device < 0 || maple_device > 3 ) {
278 ERROR( "Device number must be between 0..3 (not '%s')", buf+7);
279 continue;
280 }
281 maple_subdevice = 0;
282 device = maple_new_device( value );
283 if( device == NULL ) {
284 ERROR( "Unrecognized device '%s'", value );
285 } else {
286 devgroup.key = "controllers";
287 devgroup.params = maple_get_device_config(device);
288 maple_attach_device( device, maple_device, maple_subdevice );
289 group = &devgroup;
290 }
291 continue;
292 } else if( g_strncasecmp( buf, "subdevice ", 10 ) == 0 ) {
293 maple_subdevice = strtoul( buf+10, NULL, 0 );
294 if( maple_device == -1 ) {
295 ERROR( "Subdevice not allowed without primary device" );
296 } else if( maple_subdevice < 1 || maple_subdevice > 5 ) {
297 ERROR( "Subdevice must be between 1..5 (not '%s')", buf+10 );
298 } else if( (device = maple_new_device(value)) == NULL ) {
299 ERROR( "Unrecognized subdevice '%s'", value );
300 } else {
301 devgroup.key = "controllers";
302 devgroup.params = maple_get_device_config(device);
303 maple_attach_device( device, maple_device, maple_subdevice );
304 group = &devgroup;
305 }
306 continue;
307 }
308 }
309 while( param->key != NULL ) {
310 if( strcasecmp( param->key, buf ) == 0 ) {
311 param->value = g_strdup(value);
312 break;
313 }
314 param++;
315 }
316 }
317 }
318 }
319 return TRUE;
320 }
322 gboolean dreamcast_save_config( const gchar *filename )
323 {
324 FILE *f = fopen(filename, "wo");
325 gboolean result;
326 if( f == NULL ) {
327 ERROR( "Unable to open '%s': %s", filename, strerror(errno) );
328 return FALSE;
329 }
330 result = dreamcast_save_config_stream(f);
331 fclose(f);
332 }
334 gboolean dreamcast_save_config_stream( FILE *f )
335 {
336 struct dreamcast_config_group *group = &dreamcast_config_root[0];
338 while( group->key != NULL ) {
339 struct dreamcast_config_entry *entry = group->params;
340 fprintf( f, "[%s]\n", group->key );
342 if( entry != NULL ) {
343 while( entry->key != NULL ) {
344 fprintf( f, "%s = %s\n", entry->key, entry->value );
345 entry++;
346 }
347 } else if( strcmp(group->key, "controllers") == 0 ) {
348 int i,j;
349 for( i=0; i<4; i++ ) {
350 for( j=0; j<6; j++ ) {
351 maple_device_t dev = maple_get_device( i, j );
352 if( dev != NULL ) {
353 if( j == 0 )
354 fprintf( f, "Device %d = %s\n", i, dev->device_class->name );
355 else
356 fprintf( f, "Subdevice %d = %s\n", j, dev->device_class->name );
357 entry = dev->get_config(dev);
358 while( entry->key != NULL ) {
359 fprintf( f, "%*c%s = %s\n", j==0?4:8, ' ',entry->key, entry->value );
360 entry++;
361 }
362 }
363 }
364 }
365 }
366 fprintf( f, "\n" );
367 group++;
368 }
369 return TRUE;
370 }
372 /********************************* Save States *****************************/
374 struct save_state_header {
375 char magic[16];
376 uint32_t version;
377 uint32_t module_count;
378 };
380 int dreamcast_load_state( const gchar *filename )
381 {
382 int i,j;
383 uint32_t count, len;
384 int have_read[MAX_MODULES];
385 char tmp[64];
386 struct save_state_header header;
387 FILE *f;
389 f = fopen( filename, "r" );
390 if( f == NULL ) return errno;
392 fread( &header, sizeof(header), 1, f );
393 if( strncmp( header.magic, DREAMCAST_SAVE_MAGIC, 16 ) != 0 ) {
394 ERROR( "Not a %s save state file", APP_NAME );
395 return 1;
396 }
397 if( header.version != DREAMCAST_SAVE_VERSION ) {
398 ERROR( "%s save state version not supported", APP_NAME );
399 return 1;
400 }
401 if( header.module_count > MAX_MODULES ) {
402 ERROR( "%s save state is corrupted (bad module count)", APP_NAME );
403 return 1;
404 }
405 for( i=0; i<MAX_MODULES; i++ ) {
406 have_read[i] = 0;
407 }
409 for( i=0; i<header.module_count; i++ ) {
410 fread(tmp, 4, 1, f );
411 if( strncmp(tmp, "BLCK", 4) != 0 ) {
412 ERROR( "%s save state is corrupted (missing block header %d)", APP_NAME, i );
413 return 2;
414 }
415 len = fread_string(tmp, sizeof(tmp), f );
416 if( len > 64 || len < 1 ) {
417 ERROR( "%s save state is corrupted (bad string)", APP_NAME );
418 return 2;
419 }
421 /* Find the matching module by name */
422 for( j=0; j<num_modules; j++ ) {
423 if( strcmp(modules[j]->name,tmp) == 0 ) {
424 have_read[j] = 1;
425 if( modules[j]->load == NULL ) {
426 ERROR( "%s save state is corrupted (no loader for %s)", APP_NAME, modules[j]->name );
427 return 2;
428 } else if( modules[j]->load(f) != 0 ) {
429 ERROR( "%s save state is corrupted (%s failed)", APP_NAME, modules[j]->name );
430 return 2;
431 }
432 break;
433 }
434 }
435 if( j == num_modules ) {
436 ERROR( "%s save state contains unrecognized section", APP_NAME );
437 return 2;
438 }
439 }
441 /* Any modules that we didn't load - reset to the default state.
442 * (ie it's not an error to skip a module if you don't actually
443 * care about its state).
444 */
445 for( j=0; j<num_modules; j++ ) {
446 if( have_read[j] == 0 && modules[j]->reset != NULL ) {
447 modules[j]->reset();
448 }
449 }
450 fclose(f);
451 INFO( "Save state read from %s", filename );
452 }
454 int dreamcast_save_state( const gchar *filename )
455 {
456 int i;
457 FILE *f;
458 struct save_state_header header;
460 f = fopen( filename, "w" );
461 if( f == NULL )
462 return errno;
463 strcpy( header.magic, DREAMCAST_SAVE_MAGIC );
464 header.version = DREAMCAST_SAVE_VERSION;
465 header.module_count = 0;
467 for( i=0; i<num_modules; i++ ) {
468 if( modules[i]->save != NULL )
469 header.module_count++;
470 }
471 fwrite( &header, sizeof(header), 1, f );
472 for( i=0; i<num_modules; i++ ) {
473 if( modules[i]->save != NULL ) {
474 fwrite( "BLCK", 4, 1, f );
475 fwrite_string( modules[i]->name, f );
476 modules[i]->save(f);
477 }
478 }
479 fclose( f );
480 INFO( "Save state written to %s", filename );
481 }
.