lxdream 0.9.1| filename | src/dreamcast.c |
| changeset | 180:e6dcf9b65658 |
| prev | 167:71c0cc416a64 |
| next | 265:5daf59b7f31b |
| author | nkeynes |
| date | Sun Jul 02 04:59:00 2006 +0000 (16 years ago) |
| permissions | -rw-r--r-- |
| last change | Merge changes made on the MILESTONE1 branch back into head (mostly release touchups) |
| view | annotate | diff | log | raw |
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 }
.