filename | src/dreamcast.c |
changeset | 561:533f6b478071 |
prev | 543:361ec0a70cf2 |
next | 585:371342a39c09 |
author | nkeynes |
date | Mon Jan 14 10:23:49 2008 +0000 (16 years ago) |
branch | lxdream-mmu |
permissions | -rw-r--r-- |
last change | Remove asm file and convert to inline (easier to cope with platform conventions) Add breakpoint support Add MMU store-queue support |
view | annotate | diff | log | raw |
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 "dream.h"
23 #include "config.h"
24 #include "mem.h"
25 #include "aica/aica.h"
26 #include "asic.h"
27 #include "dreamcast.h"
28 #include "gdrom/ide.h"
29 #include "maple/maple.h"
31 /**
32 * Current state of the DC virtual machine
33 */
34 typedef enum { STATE_UNINIT=0, STATE_RUNNING,
35 STATE_STOPPING, STATE_STOPPED } dreamcast_state_t;
37 static volatile dreamcast_state_t dreamcast_state = STATE_UNINIT;
38 static gboolean dreamcast_has_bios = FALSE;
39 static gchar *dreamcast_program_name = NULL;
40 static sh4addr_t dreamcast_entry_point = 0xA0000000;
41 static uint32_t timeslice_length = DEFAULT_TIMESLICE_LENGTH;
43 #define MAX_MODULES 32
44 static int num_modules = 0;
45 dreamcast_module_t modules[MAX_MODULES];
47 /**
48 * The unknown module is used for logging files without an actual module
49 * declaration
50 */
51 struct dreamcast_module unknown_module = { "****", NULL, NULL, NULL, NULL,
52 NULL, NULL, NULL };
54 /**
55 * This function is responsible for defining how all the pieces of the
56 * dreamcast actually fit together.
57 *
58 * Note currently the locations of the various MMIO pages are hard coded in
59 * the MMIO definitions - they should probably be moved here.
60 */
61 void dreamcast_configure( )
62 {
63 dreamcast_register_module( &eventq_module );
64 /* Register the memory framework */
65 dreamcast_register_module( &mem_module );
67 /* Setup standard memory map */
68 mem_create_repeating_ram_region( 0x0C000000, 16 MB, MEM_REGION_MAIN, 0x01000000, 0x0F000000 );
69 mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
70 mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
71 mem_create_ram_region( 0x05000000, 8 MB, MEM_REGION_VIDEO );
72 dreamcast_has_bios = mem_load_rom( lxdream_get_config_value(CONFIG_BIOS_PATH),
73 0x00000000, 0x00200000, 0x89f2b1a1,
74 MEM_REGION_BIOS );
75 mem_create_ram_region( 0x00200000, 0x00020000, MEM_REGION_FLASH );
76 mem_load_block( lxdream_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_config_changed(void)
89 {
90 dreamcast_has_bios = mem_load_rom( lxdream_get_config_value(CONFIG_BIOS_PATH),
91 0x00000000, 0x00200000, 0x89f2b1a1,
92 MEM_REGION_BIOS );
93 mem_load_block( lxdream_get_config_value(CONFIG_FLASH_PATH),
94 0x00200000, 0x00020000 );
95 }
97 void dreamcast_save_flash()
98 {
99 const char *file = lxdream_get_config_value(CONFIG_FLASH_PATH);
100 mem_save_block( file, 0x00200000, 0x00020000 );
101 }
103 /**
104 * Constructs a system configuration for the AICA in standalone mode,
105 * ie sound chip only.
106 */
107 void dreamcast_configure_aica_only( )
108 {
109 dreamcast_register_module( &mem_module );
110 mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
111 mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
112 dreamcast_register_module( &aica_module );
113 aica_enable();
114 dreamcast_state = STATE_STOPPED;
115 }
117 void dreamcast_register_module( dreamcast_module_t module )
118 {
119 modules[num_modules++] = module;
120 if( module->init != NULL )
121 module->init();
122 }
125 void dreamcast_init( void )
126 {
127 dreamcast_configure();
128 dreamcast_state = STATE_STOPPED;
129 }
131 void dreamcast_reset( void )
132 {
133 int i;
134 for( i=0; i<num_modules; i++ ) {
135 if( modules[i]->reset != NULL )
136 modules[i]->reset();
137 }
138 }
140 void dreamcast_run( void )
141 {
142 int i;
143 if( dreamcast_state != STATE_RUNNING ) {
144 for( i=0; i<num_modules; i++ ) {
145 if( modules[i]->start != NULL )
146 modules[i]->start();
147 }
148 }
149 dreamcast_state = STATE_RUNNING;
150 while( dreamcast_state == STATE_RUNNING ) {
151 int time_to_run = timeslice_length;
152 for( i=0; i<num_modules; i++ ) {
153 if( modules[i]->run_time_slice != NULL )
154 time_to_run = modules[i]->run_time_slice( time_to_run );
155 }
157 }
159 for( i=0; i<num_modules; i++ ) {
160 if( modules[i]->stop != NULL )
161 modules[i]->stop();
162 }
163 dreamcast_state = STATE_STOPPED;
164 }
166 void dreamcast_run_for( unsigned int seconds, unsigned int nanosecs )
167 {
169 int i;
170 if( dreamcast_state != STATE_RUNNING ) {
171 for( i=0; i<num_modules; i++ ) {
172 if( modules[i]->start != NULL )
173 modules[i]->start();
174 }
175 }
176 dreamcast_state = STATE_RUNNING;
177 uint32_t nanos = 0;
178 if( nanosecs != 0 ) {
179 nanos = 1000000000 - nanosecs;
180 seconds++;
181 }
182 while( dreamcast_state == STATE_RUNNING && seconds != 0 ) {
183 int time_to_run = timeslice_length;
184 for( i=0; i<num_modules; i++ ) {
185 if( modules[i]->run_time_slice != NULL )
186 time_to_run = modules[i]->run_time_slice( time_to_run );
187 }
188 nanos += time_to_run;
189 if( nanos >= 1000000000 ) {
190 nanos -= 1000000000;
191 seconds--;
192 }
193 }
195 for( i=0; i<num_modules; i++ ) {
196 if( modules[i]->stop != NULL )
197 modules[i]->stop();
198 }
199 dreamcast_state = STATE_STOPPED;
200 }
202 void dreamcast_stop( void )
203 {
204 if( dreamcast_state == STATE_RUNNING )
205 dreamcast_state = STATE_STOPPING;
206 }
208 void dreamcast_shutdown()
209 {
210 dreamcast_stop();
211 dreamcast_save_flash();
212 }
214 void dreamcast_program_loaded( const gchar *name, sh4addr_t entry_point )
215 {
216 if( dreamcast_program_name != NULL ) {
217 g_free(dreamcast_program_name);
218 }
219 dreamcast_program_name = g_strdup(name);
220 dreamcast_entry_point = entry_point;
221 sh4_set_pc(entry_point);
222 if( !dreamcast_has_bios ) {
223 bios_install();
224 }
225 dcload_install();
226 gui_update_state();
227 }
229 gboolean dreamcast_is_running( void )
230 {
231 return dreamcast_state == STATE_RUNNING;
232 }
234 gboolean dreamcast_can_run(void)
235 {
236 return dreamcast_state != STATE_UNINIT &&
237 (dreamcast_has_bios || dreamcast_program_name != NULL);
238 }
240 /********************************* Save States *****************************/
242 struct save_state_header {
243 char magic[16];
244 uint32_t version;
245 uint32_t module_count;
246 };
248 struct chunk_header {
249 char marker[4]; /* Always BLCK */
250 char name[8]; /* Block (module) name */
251 uint32_t block_length;
252 };
254 /**
255 * Check the save state header to ensure that it is a valid, supported
256 * file.
257 * @return the number of blocks following, or 0 if the file is invalid.
258 */
259 int dreamcast_read_save_state_header( FILE *f )
260 {
261 struct save_state_header header;
262 if( fread( &header, sizeof(header), 1, f ) != 1 ) {
263 return 0;
264 }
265 if( strncmp( header.magic, DREAMCAST_SAVE_MAGIC, 16 ) != 0 ) {
266 ERROR( "Not a %s save state file", APP_NAME );
267 return 0;
268 }
269 if( header.version != DREAMCAST_SAVE_VERSION ) {
270 ERROR( "%s save state version not supported", APP_NAME );
271 return 0;
272 }
273 if( header.module_count > MAX_MODULES ) {
274 ERROR( "%s save state is corrupted (bad module count)", APP_NAME );
275 return 0;
276 }
277 return header.module_count;
278 }
280 int dreamcast_write_chunk_header( const gchar *name, uint32_t length, FILE *f )
281 {
282 struct chunk_header head;
284 memcpy( head.marker, "BLCK", 4 );
285 memset( head.name, 0, 8 );
286 memcpy( head.name, name, strlen(name) );
287 head.block_length = length;
288 return fwrite( &head, sizeof(head), 1, f );
289 }
292 frame_buffer_t dreamcast_load_preview( const gchar *filename )
293 {
294 int i;
295 FILE *f = fopen( filename, "r" );
296 if( f == NULL ) return NULL;
298 int module_count = dreamcast_read_save_state_header(f);
299 if( module_count <= 0 ) {
300 fclose(f);
301 return NULL;
302 }
303 for( i=0; i<module_count; i++ ) {
304 struct chunk_header head;
305 if( fread( &head, sizeof(head), 1, f ) != 1 ) {
306 fclose(f);
307 return NULL;
308 }
309 if( memcmp("BLCK", head.marker, 4) != 0 ) {
310 fclose(f);
311 return NULL;
312 }
314 if( strcmp("PVR2", head.name) == 0 ) {
315 uint32_t buf_count;
316 int has_front;
317 fread( &buf_count, sizeof(buf_count), 1, f );
318 fread( &has_front, sizeof(has_front), 1, f );
319 if( buf_count != 0 && has_front ) {
320 frame_buffer_t result = read_png_from_stream(f);
321 fclose(f);
322 return result;
323 }
324 break;
325 } else {
326 fseek( f, head.block_length, SEEK_CUR );
327 }
328 }
329 return NULL;
330 }
332 int dreamcast_load_state( const gchar *filename )
333 {
334 int i,j;
335 int module_count;
336 int have_read[MAX_MODULES];
338 FILE *f = fopen( filename, "r" );
339 if( f == NULL ) return errno;
341 module_count = dreamcast_read_save_state_header(f);
342 if( module_count <= 0 ) {
343 fclose(f);
344 return 1;
345 }
347 for( i=0; i<MAX_MODULES; i++ ) {
348 have_read[i] = 0;
349 }
351 for( i=0; i<module_count; i++ ) {
352 struct chunk_header chunk;
353 fread( &chunk, sizeof(chunk), 1, f );
354 if( strncmp(chunk.marker, "BLCK", 4) != 0 ) {
355 ERROR( "%s save state is corrupted (missing block header %d)", APP_NAME, i );
356 fclose(f);
357 return 2;
358 }
360 /* Find the matching module by name */
361 for( j=0; j<num_modules; j++ ) {
362 if( strcmp(modules[j]->name,chunk.name) == 0 ) {
363 have_read[j] = 1;
364 if( modules[j]->load == NULL ) {
365 ERROR( "%s save state is corrupted (no loader for %s)", APP_NAME, modules[j]->name );
366 fclose(f);
367 return 2;
368 } else if( modules[j]->load(f) != 0 ) {
369 ERROR( "%s save state is corrupted (%s failed)", APP_NAME, modules[j]->name );
370 fclose(f);
371 return 2;
372 }
373 break;
374 }
375 }
376 if( j == num_modules ) {
377 fclose(f);
378 ERROR( "%s save state contains unrecognized section", APP_NAME );
379 return 2;
380 }
381 }
383 /* Any modules that we didn't load - reset to the default state.
384 * (ie it's not an error to skip a module if you don't actually
385 * care about its state).
386 */
387 for( j=0; j<num_modules; j++ ) {
388 if( have_read[j] == 0 && modules[j]->reset != NULL ) {
389 modules[j]->reset();
390 }
391 }
392 fclose(f);
393 INFO( "Save state read from %s", filename );
394 return 0;
395 }
397 int dreamcast_save_state( const gchar *filename )
398 {
399 int i;
400 FILE *f;
401 struct save_state_header header;
403 f = fopen( filename, "w" );
404 if( f == NULL )
405 return errno;
406 strcpy( header.magic, DREAMCAST_SAVE_MAGIC );
407 header.version = DREAMCAST_SAVE_VERSION;
408 header.module_count = 0;
410 for( i=0; i<num_modules; i++ ) {
411 if( modules[i]->save != NULL )
412 header.module_count++;
413 }
414 fwrite( &header, sizeof(header), 1, f );
415 for( i=0; i<num_modules; i++ ) {
416 if( modules[i]->save != NULL ) {
417 uint32_t blocklen, posn1, posn2;
418 dreamcast_write_chunk_header( modules[i]->name, 0, f );
419 posn1 = ftell(f);
420 modules[i]->save(f);
421 posn2 = ftell(f);
422 blocklen = posn2 - posn1;
423 fseek( f, posn1-4, SEEK_SET );
424 fwrite( &blocklen, sizeof(blocklen), 1, f );
425 fseek( f, posn2, SEEK_SET );
426 }
427 }
428 fclose( f );
429 INFO( "Save state written to %s", filename );
430 return 0;
431 }
.