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.
25 #include "aica/aica.h"
27 #include "dreamcast.h"
28 #include "gdrom/ide.h"
29 #include "maple/maple.h"
30 #include "sh4/sh4trans.h"
33 * Current state of the DC virtual machine
35 typedef enum { STATE_UNINIT=0, STATE_RUNNING,
36 STATE_STOPPING, STATE_STOPPED } dreamcast_state_t;
38 static volatile dreamcast_state_t dreamcast_state = STATE_UNINIT;
39 static gboolean dreamcast_has_bios = FALSE;
40 static gchar *dreamcast_program_name = NULL;
41 static sh4addr_t dreamcast_entry_point = 0xA0000000;
42 static uint32_t timeslice_length = DEFAULT_TIMESLICE_LENGTH;
44 #define MAX_MODULES 32
45 static int num_modules = 0;
46 dreamcast_module_t modules[MAX_MODULES];
49 * The unknown module is used for logging files without an actual module
52 struct dreamcast_module unknown_module = { "****", NULL, NULL, NULL, NULL,
56 * This function is responsible for defining how all the pieces of the
57 * dreamcast actually fit together.
59 * Note currently the locations of the various MMIO pages are hard coded in
60 * the MMIO definitions - they should probably be moved here.
62 void dreamcast_configure( )
64 dreamcast_register_module( &eventq_module );
65 /* Register the memory framework */
66 dreamcast_register_module( &mem_module );
68 /* Setup standard memory map */
69 mem_create_repeating_ram_region( 0x0C000000, 16 MB, MEM_REGION_MAIN, 0x01000000, 0x0F000000 );
70 mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
71 mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
72 mem_create_ram_region( 0x05000000, 8 MB, MEM_REGION_VIDEO );
73 dreamcast_has_bios = mem_load_rom( lxdream_get_config_value(CONFIG_BIOS_PATH),
74 0x00000000, 0x00200000, 0x89f2b1a1,
76 mem_create_ram_region( 0x00200000, 0x00020000, MEM_REGION_FLASH );
77 mem_load_block( lxdream_get_config_value(CONFIG_FLASH_PATH),
78 0x00200000, 0x00020000 );
80 /* Load in the rest of the core modules */
81 dreamcast_register_module( &sh4_module );
82 dreamcast_register_module( &asic_module );
83 dreamcast_register_module( &pvr2_module );
84 dreamcast_register_module( &aica_module );
85 dreamcast_register_module( &maple_module );
86 dreamcast_register_module( &ide_module );
89 void dreamcast_config_changed(void)
91 dreamcast_has_bios = mem_load_rom( lxdream_get_config_value(CONFIG_BIOS_PATH),
92 0x00000000, 0x00200000, 0x89f2b1a1,
94 mem_load_block( lxdream_get_config_value(CONFIG_FLASH_PATH),
95 0x00200000, 0x00020000 );
98 void dreamcast_save_flash()
100 const char *file = lxdream_get_config_value(CONFIG_FLASH_PATH);
101 mem_save_block( file, 0x00200000, 0x00020000 );
105 * Constructs a system configuration for the AICA in standalone mode,
106 * ie sound chip only.
108 void dreamcast_configure_aica_only( )
110 dreamcast_register_module( &mem_module );
111 mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
112 mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
113 dreamcast_register_module( &aica_module );
115 dreamcast_state = STATE_STOPPED;
118 void dreamcast_register_module( dreamcast_module_t module )
120 modules[num_modules++] = module;
121 if( module->init != NULL )
126 void dreamcast_init( void )
128 dreamcast_configure();
129 dreamcast_state = STATE_STOPPED;
132 void dreamcast_reset( void )
135 if( sh4_xlat_is_running() ) {
136 sh4_translate_exit( XLAT_EXIT_SYSRESET );
138 for( i=0; i<num_modules; i++ ) {
139 if( modules[i]->reset != NULL )
144 void dreamcast_run( void )
147 if( dreamcast_state != STATE_RUNNING ) {
148 for( i=0; i<num_modules; i++ ) {
149 if( modules[i]->start != NULL )
153 dreamcast_state = STATE_RUNNING;
154 while( dreamcast_state == STATE_RUNNING ) {
155 int time_to_run = timeslice_length;
156 for( i=0; i<num_modules; i++ ) {
157 if( modules[i]->run_time_slice != NULL )
158 time_to_run = modules[i]->run_time_slice( time_to_run );
163 for( i=0; i<num_modules; i++ ) {
164 if( modules[i]->stop != NULL )
167 dreamcast_state = STATE_STOPPED;
170 void dreamcast_run_for( unsigned int seconds, unsigned int nanosecs )
174 if( dreamcast_state != STATE_RUNNING ) {
175 for( i=0; i<num_modules; i++ ) {
176 if( modules[i]->start != NULL )
180 dreamcast_state = STATE_RUNNING;
182 if( nanosecs != 0 ) {
183 nanos = 1000000000 - nanosecs;
186 while( dreamcast_state == STATE_RUNNING && seconds != 0 ) {
187 int time_to_run = timeslice_length;
188 for( i=0; i<num_modules; i++ ) {
189 if( modules[i]->run_time_slice != NULL )
190 time_to_run = modules[i]->run_time_slice( time_to_run );
192 nanos += time_to_run;
193 if( nanos >= 1000000000 ) {
199 for( i=0; i<num_modules; i++ ) {
200 if( modules[i]->stop != NULL )
203 dreamcast_state = STATE_STOPPED;
206 void dreamcast_stop( void )
208 if( sh4_xlat_is_running() ) {
209 sh4_translate_exit( XLAT_EXIT_HALT );
211 if( dreamcast_state == STATE_RUNNING )
212 dreamcast_state = STATE_STOPPING;
215 void dreamcast_shutdown()
218 dreamcast_save_flash();
221 void dreamcast_program_loaded( const gchar *name, sh4addr_t entry_point )
223 if( dreamcast_program_name != NULL ) {
224 g_free(dreamcast_program_name);
226 dreamcast_program_name = g_strdup(name);
227 dreamcast_entry_point = entry_point;
228 sh4_set_pc(entry_point);
234 gboolean dreamcast_is_running( void )
236 return dreamcast_state == STATE_RUNNING;
239 gboolean dreamcast_can_run(void)
241 return dreamcast_state != STATE_UNINIT &&
242 (dreamcast_has_bios || dreamcast_program_name != NULL);
245 /********************************* Save States *****************************/
247 struct save_state_header {
250 uint32_t module_count;
253 struct chunk_header {
254 char marker[4]; /* Always BLCK */
255 char name[8]; /* Block (module) name */
256 uint32_t block_length;
260 * Check the save state header to ensure that it is a valid, supported
262 * @return the number of blocks following, or 0 if the file is invalid.
264 int dreamcast_read_save_state_header( FILE *f )
266 struct save_state_header header;
267 if( fread( &header, sizeof(header), 1, f ) != 1 ) {
270 if( strncmp( header.magic, DREAMCAST_SAVE_MAGIC, 16 ) != 0 ) {
271 ERROR( "Not a %s save state file", APP_NAME );
274 if( header.version != DREAMCAST_SAVE_VERSION ) {
275 ERROR( "%s save state version not supported", APP_NAME );
278 if( header.module_count > MAX_MODULES ) {
279 ERROR( "%s save state is corrupted (bad module count)", APP_NAME );
282 return header.module_count;
285 int dreamcast_write_chunk_header( const gchar *name, uint32_t length, FILE *f )
287 struct chunk_header head;
289 memcpy( head.marker, "BLCK", 4 );
290 memset( head.name, 0, 8 );
291 memcpy( head.name, name, strlen(name) );
292 head.block_length = length;
293 return fwrite( &head, sizeof(head), 1, f );
297 frame_buffer_t dreamcast_load_preview( const gchar *filename )
300 FILE *f = fopen( filename, "r" );
301 if( f == NULL ) return NULL;
303 int module_count = dreamcast_read_save_state_header(f);
304 if( module_count <= 0 ) {
308 for( i=0; i<module_count; i++ ) {
309 struct chunk_header head;
310 if( fread( &head, sizeof(head), 1, f ) != 1 ) {
314 if( memcmp("BLCK", head.marker, 4) != 0 ) {
319 if( strcmp("PVR2", head.name) == 0 ) {
322 fread( &buf_count, sizeof(buf_count), 1, f );
323 fread( &has_front, sizeof(has_front), 1, f );
324 if( buf_count != 0 && has_front ) {
325 frame_buffer_t result = read_png_from_stream(f);
331 fseek( f, head.block_length, SEEK_CUR );
337 int dreamcast_load_state( const gchar *filename )
341 int have_read[MAX_MODULES];
343 FILE *f = fopen( filename, "r" );
344 if( f == NULL ) return errno;
346 module_count = dreamcast_read_save_state_header(f);
347 if( module_count <= 0 ) {
352 for( i=0; i<MAX_MODULES; i++ ) {
356 for( i=0; i<module_count; i++ ) {
357 struct chunk_header chunk;
358 fread( &chunk, sizeof(chunk), 1, f );
359 if( strncmp(chunk.marker, "BLCK", 4) != 0 ) {
360 ERROR( "%s save state is corrupted (missing block header %d)", APP_NAME, i );
365 /* Find the matching module by name */
366 for( j=0; j<num_modules; j++ ) {
367 if( strcmp(modules[j]->name,chunk.name) == 0 ) {
369 if( modules[j]->load == NULL ) {
370 ERROR( "%s save state is corrupted (no loader for %s)", APP_NAME, modules[j]->name );
373 } else if( modules[j]->load(f) != 0 ) {
374 ERROR( "%s save state is corrupted (%s failed)", APP_NAME, modules[j]->name );
381 if( j == num_modules ) {
383 ERROR( "%s save state contains unrecognized section", APP_NAME );
388 /* Any modules that we didn't load - reset to the default state.
389 * (ie it's not an error to skip a module if you don't actually
390 * care about its state).
392 for( j=0; j<num_modules; j++ ) {
393 if( have_read[j] == 0 && modules[j]->reset != NULL ) {
398 INFO( "Save state read from %s", filename );
402 int dreamcast_save_state( const gchar *filename )
406 struct save_state_header header;
408 f = fopen( filename, "w" );
411 strcpy( header.magic, DREAMCAST_SAVE_MAGIC );
412 header.version = DREAMCAST_SAVE_VERSION;
413 header.module_count = 0;
415 for( i=0; i<num_modules; i++ ) {
416 if( modules[i]->save != NULL )
417 header.module_count++;
419 fwrite( &header, sizeof(header), 1, f );
420 for( i=0; i<num_modules; i++ ) {
421 if( modules[i]->save != NULL ) {
422 uint32_t blocklen, posn1, posn2;
423 dreamcast_write_chunk_header( modules[i]->name, 0, f );
427 blocklen = posn2 - posn1;
428 fseek( f, posn1-4, SEEK_SET );
429 fwrite( &blocklen, sizeof(blocklen), 1, f );
430 fseek( f, posn2, SEEK_SET );
434 INFO( "Save state written to %s", filename );
.