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...
7 * Copyright (c) 2005 Nathan Keynes.
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.
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.
24 #include "dreamcast.h"
28 #include "aica/aica.h"
29 #include "gdrom/ide.h"
30 #include "maple/maple.h"
32 #include "sh4/sh4trans.h"
35 * Current state of the DC virtual machine
37 typedef enum { STATE_UNINIT=0, STATE_RUNNING,
38 STATE_STOPPING, STATE_STOPPED } dreamcast_state_t;
40 static volatile dreamcast_state_t dreamcast_state = STATE_UNINIT;
41 static gboolean dreamcast_has_bios = FALSE;
42 static gchar *dreamcast_program_name = NULL;
43 static sh4addr_t dreamcast_entry_point = 0xA0000000;
44 static uint32_t timeslice_length = DEFAULT_TIMESLICE_LENGTH;
46 #define MAX_MODULES 32
47 static int num_modules = 0;
48 dreamcast_module_t modules[MAX_MODULES];
51 * The unknown module is used for logging files without an actual module
54 struct dreamcast_module unknown_module = { "****", NULL, NULL, NULL, NULL,
58 * This function is responsible for defining how all the pieces of the
59 * dreamcast actually fit together.
61 * Note currently the locations of the various MMIO pages are hard coded in
62 * the MMIO definitions - they should probably be moved here.
64 void dreamcast_configure( )
66 dreamcast_register_module( &eventq_module );
67 /* Register the memory framework */
68 dreamcast_register_module( &mem_module );
70 /* Setup standard memory map */
71 mem_create_repeating_ram_region( 0x0C000000, 16 MB, MEM_REGION_MAIN, 0x01000000, 0x0F000000 );
72 mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
73 mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
74 mem_create_ram_region( 0x05000000, 8 MB, MEM_REGION_VIDEO );
75 dreamcast_has_bios = mem_load_rom( lxdream_get_config_value(CONFIG_BIOS_PATH),
76 0x00000000, 0x00200000, 0x89f2b1a1,
78 mem_create_ram_region( 0x00200000, 0x00020000, MEM_REGION_FLASH );
79 mem_load_block( lxdream_get_config_value(CONFIG_FLASH_PATH),
80 0x00200000, 0x00020000 );
82 /* Load in the rest of the core modules */
83 dreamcast_register_module( &sh4_module );
84 dreamcast_register_module( &asic_module );
85 dreamcast_register_module( &pvr2_module );
86 dreamcast_register_module( &aica_module );
87 dreamcast_register_module( &maple_module );
88 dreamcast_register_module( &ide_module );
91 void dreamcast_config_changed(void)
93 dreamcast_has_bios = mem_load_rom( lxdream_get_config_value(CONFIG_BIOS_PATH),
94 0x00000000, 0x00200000, 0x89f2b1a1,
96 mem_load_block( lxdream_get_config_value(CONFIG_FLASH_PATH),
97 0x00200000, 0x00020000 );
100 void dreamcast_save_flash()
102 const char *file = lxdream_get_config_value(CONFIG_FLASH_PATH);
103 mem_save_block( file, 0x00200000, 0x00020000 );
107 * Constructs a system configuration for the AICA in standalone mode,
108 * ie sound chip only.
110 void dreamcast_configure_aica_only( )
112 dreamcast_register_module( &mem_module );
113 mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
114 mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
115 dreamcast_register_module( &aica_module );
117 dreamcast_state = STATE_STOPPED;
120 void dreamcast_register_module( dreamcast_module_t module )
122 modules[num_modules++] = module;
123 if( module->init != NULL )
128 void dreamcast_init( void )
130 dreamcast_configure();
131 dreamcast_state = STATE_STOPPED;
134 void dreamcast_reset( void )
137 if( sh4_xlat_is_running() ) {
138 sh4_translate_exit( XLAT_EXIT_SYSRESET );
140 for( i=0; i<num_modules; i++ ) {
141 if( modules[i]->reset != NULL )
146 void dreamcast_run( void )
149 if( dreamcast_state != STATE_RUNNING ) {
150 for( i=0; i<num_modules; i++ ) {
151 if( modules[i]->start != NULL )
155 dreamcast_state = STATE_RUNNING;
156 while( dreamcast_state == STATE_RUNNING ) {
157 int time_to_run = timeslice_length;
158 for( i=0; i<num_modules; i++ ) {
159 if( modules[i]->run_time_slice != NULL )
160 time_to_run = modules[i]->run_time_slice( time_to_run );
165 for( i=0; i<num_modules; i++ ) {
166 if( modules[i]->stop != NULL )
169 dreamcast_state = STATE_STOPPED;
172 void dreamcast_run_for( unsigned int seconds, unsigned int nanosecs )
176 if( dreamcast_state != STATE_RUNNING ) {
177 for( i=0; i<num_modules; i++ ) {
178 if( modules[i]->start != NULL )
182 dreamcast_state = STATE_RUNNING;
184 if( nanosecs != 0 ) {
185 nanos = 1000000000 - nanosecs;
188 while( dreamcast_state == STATE_RUNNING && seconds != 0 ) {
189 int time_to_run = timeslice_length;
190 for( i=0; i<num_modules; i++ ) {
191 if( modules[i]->run_time_slice != NULL )
192 time_to_run = modules[i]->run_time_slice( time_to_run );
194 nanos += time_to_run;
195 if( nanos >= 1000000000 ) {
201 for( i=0; i<num_modules; i++ ) {
202 if( modules[i]->stop != NULL )
205 dreamcast_state = STATE_STOPPED;
208 void dreamcast_stop( void )
210 if( sh4_xlat_is_running() ) {
211 sh4_translate_exit( XLAT_EXIT_HALT );
213 if( dreamcast_state == STATE_RUNNING )
214 dreamcast_state = STATE_STOPPING;
217 void dreamcast_shutdown()
220 dreamcast_save_flash();
221 #ifdef ENABLE_SH4STATS
222 sh4_stats_print(stdout);
226 void dreamcast_program_loaded( const gchar *name, sh4addr_t entry_point )
228 if( dreamcast_program_name != NULL ) {
229 g_free(dreamcast_program_name);
231 dreamcast_program_name = g_strdup(name);
232 dreamcast_entry_point = entry_point;
233 sh4_set_pc(entry_point);
239 gboolean dreamcast_is_running( void )
241 return dreamcast_state == STATE_RUNNING;
244 gboolean dreamcast_can_run(void)
246 return dreamcast_state != STATE_UNINIT &&
247 (dreamcast_has_bios || dreamcast_program_name != NULL);
250 /********************************* Save States *****************************/
252 struct save_state_header {
255 uint32_t module_count;
258 struct chunk_header {
259 char marker[4]; /* Always BLCK */
260 char name[8]; /* Block (module) name */
261 uint32_t block_length;
265 * Check the save state header to ensure that it is a valid, supported
267 * @return the number of blocks following, or 0 if the file is invalid.
269 int dreamcast_read_save_state_header( FILE *f )
271 struct save_state_header header;
272 if( fread( &header, sizeof(header), 1, f ) != 1 ) {
275 if( strncmp( header.magic, DREAMCAST_SAVE_MAGIC, 16 ) != 0 ) {
276 ERROR( "Not a %s save state file", APP_NAME );
279 if( header.version != DREAMCAST_SAVE_VERSION ) {
280 ERROR( "%s save state version not supported", APP_NAME );
283 if( header.module_count > MAX_MODULES ) {
284 ERROR( "%s save state is corrupted (bad module count)", APP_NAME );
287 return header.module_count;
290 int dreamcast_write_chunk_header( const gchar *name, uint32_t length, FILE *f )
292 struct chunk_header head;
294 memcpy( head.marker, "BLCK", 4 );
295 memset( head.name, 0, 8 );
296 memcpy( head.name, name, strlen(name) );
297 head.block_length = length;
298 return fwrite( &head, sizeof(head), 1, f );
302 frame_buffer_t dreamcast_load_preview( const gchar *filename )
305 FILE *f = fopen( filename, "r" );
306 if( f == NULL ) return NULL;
308 int module_count = dreamcast_read_save_state_header(f);
309 if( module_count <= 0 ) {
313 for( i=0; i<module_count; i++ ) {
314 struct chunk_header head;
315 if( fread( &head, sizeof(head), 1, f ) != 1 ) {
319 if( memcmp("BLCK", head.marker, 4) != 0 ) {
324 if( strcmp("PVR2", head.name) == 0 ) {
327 fread( &buf_count, sizeof(buf_count), 1, f );
328 fread( &has_front, sizeof(has_front), 1, f );
329 if( buf_count != 0 && has_front ) {
330 frame_buffer_t result = read_png_from_stream(f);
336 fseek( f, head.block_length, SEEK_CUR );
342 int dreamcast_load_state( const gchar *filename )
346 int have_read[MAX_MODULES];
348 FILE *f = fopen( filename, "r" );
349 if( f == NULL ) return errno;
351 module_count = dreamcast_read_save_state_header(f);
352 if( module_count <= 0 ) {
357 for( i=0; i<MAX_MODULES; i++ ) {
361 for( i=0; i<module_count; i++ ) {
362 struct chunk_header chunk;
363 fread( &chunk, sizeof(chunk), 1, f );
364 if( strncmp(chunk.marker, "BLCK", 4) != 0 ) {
365 ERROR( "%s save state is corrupted (missing block header %d)", APP_NAME, i );
370 /* Find the matching module by name */
371 for( j=0; j<num_modules; j++ ) {
372 if( strcmp(modules[j]->name,chunk.name) == 0 ) {
374 if( modules[j]->load == NULL ) {
375 ERROR( "%s save state is corrupted (no loader for %s)", APP_NAME, modules[j]->name );
378 } else if( modules[j]->load(f) != 0 ) {
379 ERROR( "%s save state is corrupted (%s failed)", APP_NAME, modules[j]->name );
386 if( j == num_modules ) {
388 ERROR( "%s save state contains unrecognized section", APP_NAME );
393 /* Any modules that we didn't load - reset to the default state.
394 * (ie it's not an error to skip a module if you don't actually
395 * care about its state).
397 for( j=0; j<num_modules; j++ ) {
398 if( have_read[j] == 0 && modules[j]->reset != NULL ) {
403 INFO( "Save state read from %s", filename );
407 int dreamcast_save_state( const gchar *filename )
411 struct save_state_header header;
413 f = fopen( filename, "w" );
416 strcpy( header.magic, DREAMCAST_SAVE_MAGIC );
417 header.version = DREAMCAST_SAVE_VERSION;
418 header.module_count = 0;
420 for( i=0; i<num_modules; i++ ) {
421 if( modules[i]->save != NULL )
422 header.module_count++;
424 fwrite( &header, sizeof(header), 1, f );
425 for( i=0; i<num_modules; i++ ) {
426 if( modules[i]->save != NULL ) {
427 uint32_t blocklen, posn1, posn2;
428 dreamcast_write_chunk_header( modules[i]->name, 0, f );
432 blocklen = posn2 - posn1;
433 fseek( f, posn1-4, SEEK_SET );
434 fwrite( &blocklen, sizeof(blocklen), 1, f );
435 fseek( f, posn2, SEEK_SET );
439 INFO( "Save state written to %s", filename );
.