filename | src/dreamcast.c |
changeset | 934:3acd3b3ee6d1 |
prev | 931:430048ea8b71 |
next | 951:63483914846f |
author | nkeynes |
date | Tue Jan 06 01:58:08 2009 +0000 (15 years ago) |
branch | lxdream-mem |
permissions | -rw-r--r-- |
last change | Fully integrate SQ with the new address space code - added additional 'prefetch' memory accessor. TLB is utterly untested, but non-TLB at least still works. |
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 "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 "pvr2/pvr2.h"
33 #include "sh4/sh4.h"
34 #include "sh4/sh4core.h"
36 /**
37 * Current state of the DC virtual machine
38 */
39 typedef enum { STATE_UNINIT=0, STATE_RUNNING,
40 STATE_STOPPING, STATE_STOPPED } dreamcast_state_t;
42 static volatile dreamcast_state_t dreamcast_state = STATE_UNINIT;
43 static gboolean dreamcast_has_bios = FALSE;
44 static gboolean dreamcast_has_flash = FALSE;
45 static gboolean dreamcast_exit_on_stop = FALSE;
46 static gchar *dreamcast_program_name = NULL;
47 static sh4addr_t dreamcast_entry_point = 0xA0000000;
48 static uint32_t timeslice_length = DEFAULT_TIMESLICE_LENGTH;
49 static uint64_t run_time_nanosecs = 0;
51 #define MAX_MODULES 32
52 static int num_modules = 0;
53 dreamcast_module_t modules[MAX_MODULES];
55 /**
56 * The unknown module is used for logging files without an actual module
57 * declaration
58 */
59 struct dreamcast_module unknown_module = { "****", NULL, NULL, NULL, NULL,
60 NULL, NULL, NULL };
62 extern struct mem_region_fn mem_region_sdram;
63 extern struct mem_region_fn mem_region_vram32;
64 extern struct mem_region_fn mem_region_vram64;
65 extern struct mem_region_fn mem_region_audioram;
66 extern struct mem_region_fn mem_region_audioscratch;
67 extern struct mem_region_fn mem_region_flashram;
68 extern struct mem_region_fn mem_region_bootrom;
69 extern struct mem_region_fn mem_region_pvr2ta;
70 extern struct mem_region_fn mem_region_pvr2yuv;
71 extern struct mem_region_fn mem_region_pvr2vdma1;
72 extern struct mem_region_fn mem_region_pvr2vdma2;
74 unsigned char dc_main_ram[16 MB];
75 unsigned char dc_boot_rom[2 MB];
76 unsigned char dc_flash_ram[128 KB];
78 /**
79 * This function is responsible for defining how all the pieces of the
80 * dreamcast actually fit together.
81 *
82 * Note currently the locations of the various MMIO pages are hard coded in
83 * the MMIO definitions - they should probably be moved here.
84 */
85 void dreamcast_configure( )
86 {
87 const char *bios_path = lxdream_get_config_value(CONFIG_BIOS_PATH);
88 const char *flash_path = lxdream_get_config_value(CONFIG_FLASH_PATH);
90 dreamcast_register_module( &eventq_module );
91 /* Register the memory framework */
92 dreamcast_register_module( &mem_module );
94 /* Setup standard memory map */
95 mem_map_region( dc_boot_rom, 0x00000000, 2 MB, MEM_REGION_BIOS, &mem_region_bootrom, MEM_FLAG_ROM, 2 MB, 0 );
96 mem_map_region( dc_flash_ram, 0x00200000, 128 KB, MEM_REGION_FLASH, &mem_region_flashram, MEM_FLAG_RAM, 128 KB, 0 );
97 mem_map_region( aica_main_ram, 0x00800000, 2 MB, MEM_REGION_AUDIO, &mem_region_audioram, MEM_FLAG_RAM, 2 MB, 0 );
98 mem_map_region( aica_scratch_ram,0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH,&mem_region_audioscratch, MEM_FLAG_RAM, 8 KB, 0 );
99 mem_map_region( NULL, 0x04000000, 8 MB, MEM_REGION_VIDEO64, &mem_region_vram64, 0, 8 MB, 0 );
100 mem_map_region( pvr2_main_ram, 0x05000000, 8 MB, MEM_REGION_VIDEO, &mem_region_vram32, MEM_FLAG_RAM, 8 MB, 0 );
101 mem_map_region( dc_main_ram, 0x0C000000, 16 MB, MEM_REGION_MAIN, &mem_region_sdram, MEM_FLAG_RAM, 0x01000000, 0x0F000000 );
102 mem_map_region( NULL, 0x10000000, 8 MB, MEM_REGION_PVR2TA, &mem_region_pvr2ta, 0, 0x02000000, 0x12000000 );
103 mem_map_region( NULL, 0x10800000, 8 MB, MEM_REGION_PVR2YUV, &mem_region_pvr2yuv, 0, 0x02000000, 0x12800000 );
104 mem_map_region( NULL, 0x11000000, 16 MB, MEM_REGION_PVR2VDMA1, &mem_region_pvr2vdma1, 0, 16 MB, 0 );
105 mem_map_region( NULL, 0x13000000, 16 MB, MEM_REGION_PVR2VDMA2, &mem_region_pvr2vdma2, 0, 16 MB, 0 );
107 dreamcast_has_bios = mem_load_rom( dc_boot_rom, bios_path, 2 MB, 0x89f2b1a1 );
108 if( flash_path != NULL && flash_path[0] != '\0' ) {
109 mem_load_block( flash_path, 0x00200000, 0x00020000 );
110 }
111 dreamcast_has_flash = TRUE;
113 /* Load in the rest of the core modules */
114 dreamcast_register_module( &sh4_module );
115 dreamcast_register_module( &asic_module );
116 dreamcast_register_module( &pvr2_module );
117 dreamcast_register_module( &aica_module );
118 dreamcast_register_module( &maple_module );
119 dreamcast_register_module( &ide_module );
120 }
122 void dreamcast_config_changed(void)
123 {
124 const char *bios_path = lxdream_get_config_value(CONFIG_BIOS_PATH);
125 const char *flash_path = lxdream_get_config_value(CONFIG_FLASH_PATH);
126 dreamcast_has_bios = mem_load_rom( dc_boot_rom, bios_path, 2 MB, 0x89f2b1a1 );
127 if( flash_path != NULL && flash_path[0] != '\0' ) {
128 mem_load_block( flash_path, 0x00200000, 0x00020000 );
129 }
130 }
132 void dreamcast_save_flash()
133 {
134 if( dreamcast_has_flash ) {
135 const char *file = lxdream_get_config_value(CONFIG_FLASH_PATH);
136 mem_save_block( file, 0x00200000, 0x00020000 );
137 }
138 }
140 /**
141 * Constructs a system configuration for the AICA in standalone mode,
142 * ie sound chip only.
143 */
144 void dreamcast_configure_aica_only( )
145 {
146 dreamcast_register_module( &mem_module );
147 mem_map_region( aica_main_ram, 0x00800000, 2 MB, MEM_REGION_AUDIO, &mem_region_audioram, MEM_FLAG_RAM, 2 MB, 0 );
148 mem_map_region( aica_scratch_ram, 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH, &mem_region_audioscratch, MEM_FLAG_RAM, 8 KB, 0 );
149 dreamcast_register_module( &aica_module );
150 aica_enable();
151 dreamcast_state = STATE_STOPPED;
152 }
154 void dreamcast_register_module( dreamcast_module_t module )
155 {
156 modules[num_modules++] = module;
157 if( module->init != NULL )
158 module->init();
159 }
161 void dreamcast_set_run_time( uint32_t secs, uint32_t nanosecs )
162 {
163 run_time_nanosecs = (((uint64_t)secs) * 1000000000) + nanosecs;
164 }
166 void dreamcast_set_exit_on_stop( gboolean flag )
167 {
168 dreamcast_exit_on_stop = flag;
169 }
171 void dreamcast_init( void )
172 {
173 dreamcast_configure();
174 dreamcast_state = STATE_STOPPED;
175 }
177 void dreamcast_reset( void )
178 {
179 sh4_core_exit(CORE_EXIT_SYSRESET);
180 int i;
181 for( i=0; i<num_modules; i++ ) {
182 if( modules[i]->reset != NULL )
183 modules[i]->reset();
184 }
185 }
187 void dreamcast_run( void )
188 {
189 int i;
191 if( !dreamcast_can_run() ) {
192 ERROR(_("No program is loaded, and no BIOS is configured (required to boot a CD image). To continue, either load a binary program, or set the path to your BIOS file in the Path Preferences"));
193 return;
194 }
196 if( dreamcast_state != STATE_RUNNING ) {
197 for( i=0; i<num_modules; i++ ) {
198 if( modules[i]->start != NULL )
199 modules[i]->start();
200 }
201 }
203 if( maple_should_grab() ) {
204 gui_set_use_grab(TRUE);
205 }
207 dreamcast_state = STATE_RUNNING;
209 if( run_time_nanosecs != 0 ) {
210 while( dreamcast_state == STATE_RUNNING ) {
211 uint32_t time_to_run = timeslice_length;
212 if( run_time_nanosecs < time_to_run ) {
213 time_to_run = (uint32_t)run_time_nanosecs;
214 }
216 for( i=0; i<num_modules; i++ ) {
217 if( modules[i]->run_time_slice != NULL )
218 time_to_run = modules[i]->run_time_slice( time_to_run );
219 }
221 if( run_time_nanosecs > time_to_run ) {
222 run_time_nanosecs -= time_to_run;
223 } else {
224 run_time_nanosecs = 0; // Finished
225 break;
226 }
227 }
228 } else {
229 while( dreamcast_state == STATE_RUNNING ) {
230 int time_to_run = timeslice_length;
231 for( i=0; i<num_modules; i++ ) {
232 if( modules[i]->run_time_slice != NULL )
233 time_to_run = modules[i]->run_time_slice( time_to_run );
234 }
236 }
237 }
239 gui_set_use_grab(FALSE);
241 for( i=0; i<num_modules; i++ ) {
242 if( modules[i]->stop != NULL )
243 modules[i]->stop();
244 }
245 dreamcast_state = STATE_STOPPED;
247 if( dreamcast_exit_on_stop ) {
248 dreamcast_shutdown();
249 exit(0);
250 }
251 }
253 void dreamcast_stop( void )
254 {
255 sh4_core_exit(CORE_EXIT_HALT); // returns only if not inside SH4 core
256 if( dreamcast_state == STATE_RUNNING )
257 dreamcast_state = STATE_STOPPING;
258 }
260 void dreamcast_shutdown()
261 {
262 // Don't do a dreamcast_stop - if we're calling this out of SH4 code,
263 // it's a shutdown-and-quit event
264 if( dreamcast_state == STATE_RUNNING )
265 dreamcast_state = STATE_STOPPING;
266 dreamcast_save_flash();
267 #ifdef ENABLE_SH4STATS
268 sh4_stats_print(stdout);
269 #endif
270 }
272 void dreamcast_program_loaded( const gchar *name, sh4addr_t entry_point )
273 {
274 if( dreamcast_program_name != NULL ) {
275 g_free(dreamcast_program_name);
276 }
277 dreamcast_program_name = g_strdup(name);
278 dreamcast_entry_point = entry_point;
279 sh4_set_pc(entry_point);
280 bios_install();
281 dcload_install();
282 gui_update_state();
283 }
285 gboolean dreamcast_is_running( void )
286 {
287 return dreamcast_state == STATE_RUNNING;
288 }
290 gboolean dreamcast_can_run(void)
291 {
292 return dreamcast_state != STATE_UNINIT &&
293 (dreamcast_has_bios || dreamcast_program_name != NULL);
294 }
296 /********************************* Save States *****************************/
298 struct save_state_header {
299 char magic[16];
300 uint32_t version;
301 uint32_t module_count;
302 };
304 struct chunk_header {
305 char marker[4]; /* Always BLCK */
306 char name[8]; /* Block (module) name */
307 uint32_t block_length;
308 };
310 /**
311 * Check the save state header to ensure that it is a valid, supported
312 * file.
313 * @return the number of blocks following, or 0 if the file is invalid.
314 */
315 int dreamcast_read_save_state_header( FILE *f, char *error, int errorlen )
316 {
317 struct save_state_header header;
318 if( fread( &header, sizeof(header), 1, f ) != 1 ) {
319 return 0;
320 }
321 if( strncmp( header.magic, DREAMCAST_SAVE_MAGIC, 16 ) != 0 ) {
322 if( error != NULL )
323 snprintf( error, errorlen, _("File is not a %s save state"), APP_NAME );
324 return 0;
325 }
326 if( header.version != DREAMCAST_SAVE_VERSION ) {
327 if( error != NULL )
328 snprintf( error, errorlen, _("Unsupported %s save state version"), APP_NAME );
329 return 0;
330 }
331 if( header.module_count > MAX_MODULES ) {
332 if( error != NULL )
333 snprintf( error, errorlen, _("%s save state is corrupted (bad module count)"), APP_NAME );
334 return 0;
335 }
336 return header.module_count;
337 }
339 int dreamcast_write_chunk_header( const gchar *name, uint32_t length, FILE *f )
340 {
341 struct chunk_header head;
343 memcpy( head.marker, "BLCK", 4 );
344 memset( head.name, 0, 8 );
345 memcpy( head.name, name, strlen(name) );
346 head.block_length = length;
347 return fwrite( &head, sizeof(head), 1, f );
348 }
351 frame_buffer_t dreamcast_load_preview( const gchar *filename )
352 {
353 int i;
354 FILE *f = fopen( filename, "r" );
355 if( f == NULL ) return NULL;
357 int module_count = dreamcast_read_save_state_header(f, NULL, 0);
358 if( module_count <= 0 ) {
359 fclose(f);
360 return NULL;
361 }
362 for( i=0; i<module_count; i++ ) {
363 struct chunk_header head;
364 if( fread( &head, sizeof(head), 1, f ) != 1 ) {
365 fclose(f);
366 return NULL;
367 }
368 if( memcmp("BLCK", head.marker, 4) != 0 ) {
369 fclose(f);
370 return NULL;
371 }
373 if( strcmp("PVR2", head.name) == 0 ) {
374 uint32_t buf_count;
375 int has_front;
376 fread( &buf_count, sizeof(buf_count), 1, f );
377 fread( &has_front, sizeof(has_front), 1, f );
378 if( buf_count != 0 && has_front ) {
379 frame_buffer_t result = read_png_from_stream(f);
380 fclose(f);
381 return result;
382 }
383 break;
384 } else {
385 fseek( f, head.block_length, SEEK_CUR );
386 }
387 }
388 return NULL;
389 }
391 int dreamcast_load_state( const gchar *filename )
392 {
393 int i,j;
394 int module_count;
395 char error[128];
396 int have_read[MAX_MODULES];
398 FILE *f = fopen( filename, "r" );
399 if( f == NULL ) return errno;
401 module_count = dreamcast_read_save_state_header(f, error, sizeof(error));
402 if( module_count <= 0 ) {
403 ERROR( error );
404 fclose(f);
405 return 1;
406 }
408 for( i=0; i<MAX_MODULES; i++ ) {
409 have_read[i] = 0;
410 }
412 for( i=0; i<module_count; i++ ) {
413 struct chunk_header chunk;
414 fread( &chunk, sizeof(chunk), 1, f );
415 if( strncmp(chunk.marker, "BLCK", 4) != 0 ) {
416 ERROR( "%s save state is corrupted (missing block header %d)", APP_NAME, i );
417 fclose(f);
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,chunk.name) == 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 fclose(f);
428 return 2;
429 } else if( modules[j]->load(f) != 0 ) {
430 ERROR( "%s save state is corrupted (%s failed)", APP_NAME, modules[j]->name );
431 fclose(f);
432 return 2;
433 }
434 break;
435 }
436 }
437 if( j == num_modules ) {
438 fclose(f);
439 ERROR( "%s save state contains unrecognized section", APP_NAME );
440 return 2;
441 }
442 }
444 /* Any modules that we didn't load - reset to the default state.
445 * (ie it's not an error to skip a module if you don't actually
446 * care about its state).
447 */
448 for( j=0; j<num_modules; j++ ) {
449 if( have_read[j] == 0 && modules[j]->reset != NULL ) {
450 modules[j]->reset();
451 }
452 }
453 fclose(f);
454 INFO( "Save state read from %s", filename );
455 return 0;
456 }
458 int dreamcast_save_state( const gchar *filename )
459 {
460 int i;
461 FILE *f;
462 struct save_state_header header;
464 f = fopen( filename, "w" );
465 if( f == NULL )
466 return errno;
467 strcpy( header.magic, DREAMCAST_SAVE_MAGIC );
468 header.version = DREAMCAST_SAVE_VERSION;
469 header.module_count = 0;
471 for( i=0; i<num_modules; i++ ) {
472 if( modules[i]->save != NULL )
473 header.module_count++;
474 }
475 fwrite( &header, sizeof(header), 1, f );
476 for( i=0; i<num_modules; i++ ) {
477 if( modules[i]->save != NULL ) {
478 uint32_t blocklen, posn1, posn2;
479 dreamcast_write_chunk_header( modules[i]->name, 0, f );
480 posn1 = ftell(f);
481 modules[i]->save(f);
482 posn2 = ftell(f);
483 blocklen = posn2 - posn1;
484 fseek( f, posn1-4, SEEK_SET );
485 fwrite( &blocklen, sizeof(blocklen), 1, f );
486 fseek( f, posn2, SEEK_SET );
487 }
488 }
489 fclose( f );
490 INFO( "Save state written to %s", filename );
491 return 0;
492 }
494 /********************* The Boot ROM address space **********************/
495 static int32_t FASTCALL ext_bootrom_read_long( sh4addr_t addr )
496 {
497 return *((int32_t *)(dc_boot_rom + (addr&0x001FFFFF)));
498 }
499 static int32_t FASTCALL ext_bootrom_read_word( sh4addr_t addr )
500 {
501 return SIGNEXT16(*((int16_t *)(dc_boot_rom + (addr&0x001FFFFF))));
502 }
503 static int32_t FASTCALL ext_bootrom_read_byte( sh4addr_t addr )
504 {
505 return SIGNEXT8(*((int16_t *)(dc_boot_rom + (addr&0x001FFFFF))));
506 }
507 static void FASTCALL ext_bootrom_read_burst( unsigned char *dest, sh4addr_t addr )
508 {
509 memcpy( dest, dc_boot_rom +(addr&0x001FFFFF), 32 );
510 }
512 struct mem_region_fn mem_region_bootrom = {
513 ext_bootrom_read_long, unmapped_write_long,
514 ext_bootrom_read_word, unmapped_write_long,
515 ext_bootrom_read_byte, unmapped_write_long,
516 ext_bootrom_read_burst, unmapped_write_burst };
518 /********************* The Flash RAM address space **********************/
519 static int32_t FASTCALL ext_flashram_read_long( sh4addr_t addr )
520 {
521 return *((int32_t *)(dc_flash_ram + (addr&0x0001FFFF)));
522 }
523 static int32_t FASTCALL ext_flashram_read_word( sh4addr_t addr )
524 {
525 return SIGNEXT16(*((int16_t *)(dc_flash_ram + (addr&0x0001FFFF))));
526 }
527 static int32_t FASTCALL ext_flashram_read_byte( sh4addr_t addr )
528 {
529 return SIGNEXT8(*((int16_t *)(dc_flash_ram + (addr&0x0001FFFF))));
530 }
531 static void FASTCALL ext_flashram_write_long( sh4addr_t addr, uint32_t val )
532 {
533 *(uint32_t *)(dc_flash_ram + (addr&0x0001FFFF)) = val;
534 asic_g2_write_word();
535 }
536 static void FASTCALL ext_flashram_write_word( sh4addr_t addr, uint32_t val )
537 {
538 *(uint16_t *)(dc_flash_ram + (addr&0x0001FFFF)) = (uint16_t)val;
539 asic_g2_write_word();
540 }
541 static void FASTCALL ext_flashram_write_byte( sh4addr_t addr, uint32_t val )
542 {
543 *(uint8_t *)(dc_flash_ram + (addr&0x0001FFFF)) = (uint8_t)val;
544 asic_g2_write_word();
545 }
546 static void FASTCALL ext_flashram_read_burst( unsigned char *dest, sh4addr_t addr )
547 {
548 memcpy( dest, dc_flash_ram+(addr&0x0001FFFF), 32 );
549 }
550 static void FASTCALL ext_flashram_write_burst( sh4addr_t addr, unsigned char *src )
551 {
552 memcpy( dc_flash_ram+(addr&0x0001FFFF), src, 32 );
553 }
555 struct mem_region_fn mem_region_flashram = { ext_flashram_read_long, ext_flashram_write_long,
556 ext_flashram_read_word, ext_flashram_write_word,
557 ext_flashram_read_byte, ext_flashram_write_byte,
558 ext_flashram_read_burst, ext_flashram_write_burst };
.