filename | src/dreamcast.c |
changeset | 839:51f1c4195790 |
prev | 825:2ac7ceccd775 |
next | 889:5baaea6d9722 |
author | nkeynes |
date | Mon Oct 06 01:05:12 2008 +0000 (15 years ago) |
permissions | -rw-r--r-- |
last change | Move bundle/system paths into paths.c, install lxdreamrc into the bundle (Fix OSX bundle missing default configuration) |
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1 /**
2 * $Id$
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.h>
22 #include "lxdream.h"
23 #include "dream.h"
24 #include "mem.h"
25 #include "dreamcast.h"
26 #include "asic.h"
27 #include "syscall.h"
28 #include "gui.h"
29 #include "aica/aica.h"
30 #include "gdrom/ide.h"
31 #include "maple/maple.h"
32 #include "sh4/sh4.h"
33 #include "sh4/sh4core.h"
35 /**
36 * Current state of the DC virtual machine
37 */
38 typedef enum { STATE_UNINIT=0, STATE_RUNNING,
39 STATE_STOPPING, STATE_STOPPED } dreamcast_state_t;
41 static volatile dreamcast_state_t dreamcast_state = STATE_UNINIT;
42 static gboolean dreamcast_has_bios = FALSE;
43 static gboolean dreamcast_has_flash = FALSE;
44 static gboolean dreamcast_exit_on_stop = FALSE;
45 static gchar *dreamcast_program_name = NULL;
46 static sh4addr_t dreamcast_entry_point = 0xA0000000;
47 static uint32_t timeslice_length = DEFAULT_TIMESLICE_LENGTH;
48 static uint64_t run_time_nanosecs = 0;
50 #define MAX_MODULES 32
51 static int num_modules = 0;
52 dreamcast_module_t modules[MAX_MODULES];
54 /**
55 * The unknown module is used for logging files without an actual module
56 * declaration
57 */
58 struct dreamcast_module unknown_module = { "****", NULL, NULL, NULL, NULL,
59 NULL, NULL, NULL };
61 /**
62 * This function is responsible for defining how all the pieces of the
63 * dreamcast actually fit together.
64 *
65 * Note currently the locations of the various MMIO pages are hard coded in
66 * the MMIO definitions - they should probably be moved here.
67 */
68 void dreamcast_configure( )
69 {
70 const char *bios_path = lxdream_get_config_value(CONFIG_BIOS_PATH);
71 const char *flash_path = lxdream_get_config_value(CONFIG_FLASH_PATH);
73 dreamcast_register_module( &eventq_module );
74 /* Register the memory framework */
75 dreamcast_register_module( &mem_module );
77 /* Setup standard memory map */
78 mem_create_repeating_ram_region( 0x0C000000, 16 MB, MEM_REGION_MAIN, 0x01000000, 0x0F000000 );
79 mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
80 mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
81 mem_create_ram_region( 0x05000000, 8 MB, MEM_REGION_VIDEO );
82 dreamcast_has_bios = mem_load_rom( bios_path, 0x00000000, 0x00200000, 0x89f2b1a1, MEM_REGION_BIOS );
83 mem_create_ram_region( 0x00200000, 0x00020000, MEM_REGION_FLASH );
84 if( flash_path != NULL && flash_path[0] != '\0' ) {
85 mem_load_block( flash_path, 0x00200000, 0x00020000 );
86 }
87 dreamcast_has_flash = TRUE;
89 /* Load in the rest of the core modules */
90 dreamcast_register_module( &sh4_module );
91 dreamcast_register_module( &asic_module );
92 dreamcast_register_module( &pvr2_module );
93 dreamcast_register_module( &aica_module );
94 dreamcast_register_module( &maple_module );
95 dreamcast_register_module( &ide_module );
96 }
98 void dreamcast_config_changed(void)
99 {
100 const char *bios_path = lxdream_get_config_value(CONFIG_BIOS_PATH);
101 const char *flash_path = lxdream_get_config_value(CONFIG_FLASH_PATH);
102 dreamcast_has_bios = mem_load_rom( bios_path, 0x00000000, 0x00200000, 0x89f2b1a1, MEM_REGION_BIOS );
103 if( flash_path != NULL && flash_path[0] != '\0' ) {
104 mem_load_block( flash_path, 0x00200000, 0x00020000 );
105 }
106 }
108 void dreamcast_save_flash()
109 {
110 if( dreamcast_has_flash ) {
111 const char *file = lxdream_get_config_value(CONFIG_FLASH_PATH);
112 mem_save_block( file, 0x00200000, 0x00020000 );
113 }
114 }
116 /**
117 * Constructs a system configuration for the AICA in standalone mode,
118 * ie sound chip only.
119 */
120 void dreamcast_configure_aica_only( )
121 {
122 dreamcast_register_module( &mem_module );
123 mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
124 mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
125 dreamcast_register_module( &aica_module );
126 aica_enable();
127 dreamcast_state = STATE_STOPPED;
128 }
130 void dreamcast_register_module( dreamcast_module_t module )
131 {
132 modules[num_modules++] = module;
133 if( module->init != NULL )
134 module->init();
135 }
137 void dreamcast_set_run_time( uint32_t secs, uint32_t nanosecs )
138 {
139 run_time_nanosecs = (((uint64_t)secs) * 1000000000) + nanosecs;
140 }
142 void dreamcast_set_exit_on_stop( gboolean flag )
143 {
144 dreamcast_exit_on_stop = flag;
145 }
147 void dreamcast_init( void )
148 {
149 dreamcast_configure();
150 dreamcast_state = STATE_STOPPED;
151 }
153 void dreamcast_reset( void )
154 {
155 sh4_core_exit(CORE_EXIT_SYSRESET);
156 int i;
157 for( i=0; i<num_modules; i++ ) {
158 if( modules[i]->reset != NULL )
159 modules[i]->reset();
160 }
161 }
163 void dreamcast_run( void )
164 {
165 int i;
167 if( dreamcast_state != STATE_RUNNING ) {
168 for( i=0; i<num_modules; i++ ) {
169 if( modules[i]->start != NULL )
170 modules[i]->start();
171 }
172 }
174 if( maple_should_grab() ) {
175 gui_set_use_grab(TRUE);
176 }
178 dreamcast_state = STATE_RUNNING;
180 if( run_time_nanosecs != 0 ) {
181 while( dreamcast_state == STATE_RUNNING ) {
182 uint32_t time_to_run = timeslice_length;
183 if( run_time_nanosecs < time_to_run ) {
184 time_to_run = (uint32_t)run_time_nanosecs;
185 }
187 for( i=0; i<num_modules; i++ ) {
188 if( modules[i]->run_time_slice != NULL )
189 time_to_run = modules[i]->run_time_slice( time_to_run );
190 }
192 if( run_time_nanosecs > time_to_run ) {
193 run_time_nanosecs -= time_to_run;
194 } else {
195 run_time_nanosecs = 0; // Finished
196 break;
197 }
198 }
199 } else {
200 while( dreamcast_state == STATE_RUNNING ) {
201 int time_to_run = timeslice_length;
202 for( i=0; i<num_modules; i++ ) {
203 if( modules[i]->run_time_slice != NULL )
204 time_to_run = modules[i]->run_time_slice( time_to_run );
205 }
207 }
208 }
210 gui_set_use_grab(FALSE);
212 for( i=0; i<num_modules; i++ ) {
213 if( modules[i]->stop != NULL )
214 modules[i]->stop();
215 }
216 dreamcast_state = STATE_STOPPED;
218 if( dreamcast_exit_on_stop ) {
219 dreamcast_shutdown();
220 exit(0);
221 }
222 }
224 void dreamcast_stop( void )
225 {
226 sh4_core_exit(CORE_EXIT_HALT); // returns only if not inside SH4 core
227 if( dreamcast_state == STATE_RUNNING )
228 dreamcast_state = STATE_STOPPING;
229 }
231 void dreamcast_shutdown()
232 {
233 // Don't do a dreamcast_stop - if we're calling this out of SH4 code,
234 // it's a shutdown-and-quit event
235 if( dreamcast_state == STATE_RUNNING )
236 dreamcast_state = STATE_STOPPING;
237 dreamcast_save_flash();
238 #ifdef ENABLE_SH4STATS
239 sh4_stats_print(stdout);
240 #endif
241 }
243 void dreamcast_program_loaded( const gchar *name, sh4addr_t entry_point )
244 {
245 if( dreamcast_program_name != NULL ) {
246 g_free(dreamcast_program_name);
247 }
248 dreamcast_program_name = g_strdup(name);
249 dreamcast_entry_point = entry_point;
250 sh4_set_pc(entry_point);
251 bios_install();
252 dcload_install();
253 gui_update_state();
254 }
256 gboolean dreamcast_is_running( void )
257 {
258 return dreamcast_state == STATE_RUNNING;
259 }
261 gboolean dreamcast_can_run(void)
262 {
263 return dreamcast_state != STATE_UNINIT &&
264 (dreamcast_has_bios || dreamcast_program_name != NULL);
265 }
267 /********************************* Save States *****************************/
269 struct save_state_header {
270 char magic[16];
271 uint32_t version;
272 uint32_t module_count;
273 };
275 struct chunk_header {
276 char marker[4]; /* Always BLCK */
277 char name[8]; /* Block (module) name */
278 uint32_t block_length;
279 };
281 /**
282 * Check the save state header to ensure that it is a valid, supported
283 * file.
284 * @return the number of blocks following, or 0 if the file is invalid.
285 */
286 int dreamcast_read_save_state_header( FILE *f )
287 {
288 struct save_state_header header;
289 if( fread( &header, sizeof(header), 1, f ) != 1 ) {
290 return 0;
291 }
292 if( strncmp( header.magic, DREAMCAST_SAVE_MAGIC, 16 ) != 0 ) {
293 ERROR( "Not a %s save state file", APP_NAME );
294 return 0;
295 }
296 if( header.version != DREAMCAST_SAVE_VERSION ) {
297 ERROR( "%s save state version not supported", APP_NAME );
298 return 0;
299 }
300 if( header.module_count > MAX_MODULES ) {
301 ERROR( "%s save state is corrupted (bad module count)", APP_NAME );
302 return 0;
303 }
304 return header.module_count;
305 }
307 int dreamcast_write_chunk_header( const gchar *name, uint32_t length, FILE *f )
308 {
309 struct chunk_header head;
311 memcpy( head.marker, "BLCK", 4 );
312 memset( head.name, 0, 8 );
313 memcpy( head.name, name, strlen(name) );
314 head.block_length = length;
315 return fwrite( &head, sizeof(head), 1, f );
316 }
319 frame_buffer_t dreamcast_load_preview( const gchar *filename )
320 {
321 int i;
322 FILE *f = fopen( filename, "r" );
323 if( f == NULL ) return NULL;
325 int module_count = dreamcast_read_save_state_header(f);
326 if( module_count <= 0 ) {
327 fclose(f);
328 return NULL;
329 }
330 for( i=0; i<module_count; i++ ) {
331 struct chunk_header head;
332 if( fread( &head, sizeof(head), 1, f ) != 1 ) {
333 fclose(f);
334 return NULL;
335 }
336 if( memcmp("BLCK", head.marker, 4) != 0 ) {
337 fclose(f);
338 return NULL;
339 }
341 if( strcmp("PVR2", head.name) == 0 ) {
342 uint32_t buf_count;
343 int has_front;
344 fread( &buf_count, sizeof(buf_count), 1, f );
345 fread( &has_front, sizeof(has_front), 1, f );
346 if( buf_count != 0 && has_front ) {
347 frame_buffer_t result = read_png_from_stream(f);
348 fclose(f);
349 return result;
350 }
351 break;
352 } else {
353 fseek( f, head.block_length, SEEK_CUR );
354 }
355 }
356 return NULL;
357 }
359 int dreamcast_load_state( const gchar *filename )
360 {
361 int i,j;
362 int module_count;
363 int have_read[MAX_MODULES];
365 FILE *f = fopen( filename, "r" );
366 if( f == NULL ) return errno;
368 module_count = dreamcast_read_save_state_header(f);
369 if( module_count <= 0 ) {
370 fclose(f);
371 return 1;
372 }
374 for( i=0; i<MAX_MODULES; i++ ) {
375 have_read[i] = 0;
376 }
378 for( i=0; i<module_count; i++ ) {
379 struct chunk_header chunk;
380 fread( &chunk, sizeof(chunk), 1, f );
381 if( strncmp(chunk.marker, "BLCK", 4) != 0 ) {
382 ERROR( "%s save state is corrupted (missing block header %d)", APP_NAME, i );
383 fclose(f);
384 return 2;
385 }
387 /* Find the matching module by name */
388 for( j=0; j<num_modules; j++ ) {
389 if( strcmp(modules[j]->name,chunk.name) == 0 ) {
390 have_read[j] = 1;
391 if( modules[j]->load == NULL ) {
392 ERROR( "%s save state is corrupted (no loader for %s)", APP_NAME, modules[j]->name );
393 fclose(f);
394 return 2;
395 } else if( modules[j]->load(f) != 0 ) {
396 ERROR( "%s save state is corrupted (%s failed)", APP_NAME, modules[j]->name );
397 fclose(f);
398 return 2;
399 }
400 break;
401 }
402 }
403 if( j == num_modules ) {
404 fclose(f);
405 ERROR( "%s save state contains unrecognized section", APP_NAME );
406 return 2;
407 }
408 }
410 /* Any modules that we didn't load - reset to the default state.
411 * (ie it's not an error to skip a module if you don't actually
412 * care about its state).
413 */
414 for( j=0; j<num_modules; j++ ) {
415 if( have_read[j] == 0 && modules[j]->reset != NULL ) {
416 modules[j]->reset();
417 }
418 }
419 fclose(f);
420 INFO( "Save state read from %s", filename );
421 return 0;
422 }
424 int dreamcast_save_state( const gchar *filename )
425 {
426 int i;
427 FILE *f;
428 struct save_state_header header;
430 f = fopen( filename, "w" );
431 if( f == NULL )
432 return errno;
433 strcpy( header.magic, DREAMCAST_SAVE_MAGIC );
434 header.version = DREAMCAST_SAVE_VERSION;
435 header.module_count = 0;
437 for( i=0; i<num_modules; i++ ) {
438 if( modules[i]->save != NULL )
439 header.module_count++;
440 }
441 fwrite( &header, sizeof(header), 1, f );
442 for( i=0; i<num_modules; i++ ) {
443 if( modules[i]->save != NULL ) {
444 uint32_t blocklen, posn1, posn2;
445 dreamcast_write_chunk_header( modules[i]->name, 0, f );
446 posn1 = ftell(f);
447 modules[i]->save(f);
448 posn2 = ftell(f);
449 blocklen = posn2 - posn1;
450 fseek( f, posn1-4, SEEK_SET );
451 fwrite( &blocklen, sizeof(blocklen), 1, f );
452 fseek( f, posn2, SEEK_SET );
453 }
454 }
455 fclose( f );
456 INFO( "Save state written to %s", filename );
457 return 0;
458 }
.