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lxdream.org :: lxdream/src/dreamcast.c
lxdream 0.9.1
released Jun 29
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filename src/dreamcast.c
changeset 1119:45602839e067
prev1109:700c5ab26a63
next1270:65fd19c07e2e
author nkeynes
date Fri Mar 02 23:49:10 2012 +1000 (8 years ago)
permissions -rw-r--r--
last change Android WIP:
* Rename gui_jni.c to gui_android.c - now quite android specific.
* Implement generic EGL driver with very minimal Java wrapper
* Run emulation in separate thread, and implement simple queue for
inter-thread communication.
* Add menu/action-bar items for start + reset
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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 <unistd.h>
    23 #include "lxdream.h"
    24 #include "lxpaths.h"
    25 #include "dream.h"
    26 #include "mem.h"
    27 #include "dreamcast.h"
    28 #include "asic.h"
    29 #include "syscall.h"
    30 #include "gui.h"
    31 #include "aica/aica.h"
    32 #include "gdrom/ide.h"
    33 #include "maple/maple.h"
    34 #include "pvr2/pvr2.h"
    35 #include "sh4/sh4.h"
    36 #include "sh4/sh4core.h"
    37 #include "vmu/vmulist.h"
    39 /**
    40  * Current state of the DC virtual machine
    41  */
    42 typedef enum { STATE_UNINIT=0, STATE_RUNNING, 
    43                STATE_STOPPING, STATE_STOPPED } dreamcast_state_t;
    45 static volatile dreamcast_state_t dreamcast_state = STATE_UNINIT;
    46 static gboolean dreamcast_use_bios = TRUE;
    47 static gboolean dreamcast_has_bios = FALSE;
    48 static gboolean dreamcast_has_flash = FALSE;
    49 static gboolean dreamcast_exit_on_stop = FALSE;
    50 static gchar *dreamcast_program_name = NULL;
    51 static sh4addr_t dreamcast_entry_point = 0xA0000000;
    52 static uint32_t timeslice_length = DEFAULT_TIMESLICE_LENGTH;
    53 static uint64_t run_time_nanosecs = 0;
    54 static unsigned int quick_save_state = -1;
    56 #define MAX_MODULES 32
    57 static int num_modules = 0;
    58 dreamcast_module_t modules[MAX_MODULES];
    60 /**
    61  * The unknown module is used for logging files without an actual module
    62  * declaration
    63  */
    64 struct dreamcast_module unknown_module = { "****", NULL, NULL, NULL, NULL, 
    65         NULL, NULL, NULL };
    67 extern struct mem_region_fn mem_region_sdram;
    68 extern struct mem_region_fn mem_region_vram32;
    69 extern struct mem_region_fn mem_region_vram64;
    70 extern struct mem_region_fn mem_region_audioram;
    71 extern struct mem_region_fn mem_region_audioscratch;
    72 extern struct mem_region_fn mem_region_flashram;
    73 extern struct mem_region_fn mem_region_bootrom;
    74 extern struct mem_region_fn mem_region_pvr2ta;
    75 extern struct mem_region_fn mem_region_pvr2yuv;
    76 extern struct mem_region_fn mem_region_pvr2vdma1;
    77 extern struct mem_region_fn mem_region_pvr2vdma2;
    79 unsigned char dc_main_ram[16 MB];
    80 unsigned char dc_boot_rom[2 MB];
    81 unsigned char dc_flash_ram[128 KB];
    83 /**
    84  * This function is responsible for defining how all the pieces of the
    85  * dreamcast actually fit together. 
    86  *
    87  * Note currently the locations of the various MMIO pages are hard coded in
    88  * the MMIO definitions - they should probably be moved here.
    89  */
    90 void dreamcast_configure( gboolean use_bootrom )
    91 {
    92     char *bios_path = lxdream_get_global_config_path_value(CONFIG_BIOS_PATH);
    93     char *flash_path = lxdream_get_global_config_path_value(CONFIG_FLASH_PATH);
    95     /* Initialize the event queue first */
    96     event_init();
    98     /* Register the memory framework */
    99     dreamcast_register_module( &mem_module );
   101     /* Setup standard memory map */
   102     mem_map_region( dc_boot_rom,     0x00000000, 2 MB,   MEM_REGION_BIOS,         &mem_region_bootrom, MEM_FLAG_ROM, 2 MB, 0 );
   103     mem_map_region( dc_flash_ram,    0x00200000, 128 KB, MEM_REGION_FLASH,        &mem_region_flashram, MEM_FLAG_RAM, 128 KB, 0 );
   104     mem_map_region( aica_main_ram,   0x00800000, 2 MB,   MEM_REGION_AUDIO,        &mem_region_audioram, MEM_FLAG_RAM, 2 MB, 0 );
   105     mem_map_region( aica_scratch_ram,0x00703000, 8 KB,   MEM_REGION_AUDIO_SCRATCH,&mem_region_audioscratch, MEM_FLAG_RAM, 8 KB, 0 );
   106     mem_map_region( NULL,            0x04000000, 8 MB,   MEM_REGION_VIDEO64,      &mem_region_vram64, 0, 8 MB, 0 );
   107     mem_map_region( pvr2_main_ram,   0x05000000, 8 MB,   MEM_REGION_VIDEO,        &mem_region_vram32, MEM_FLAG_RAM, 8 MB, 0 ); 
   108     mem_map_region( dc_main_ram,     0x0C000000, 16 MB,  MEM_REGION_MAIN,         &mem_region_sdram, MEM_FLAG_RAM, 0x01000000, 0x0F000000 );
   109     mem_map_region( NULL,            0x10000000, 8 MB,   MEM_REGION_PVR2TA,       &mem_region_pvr2ta, 0, 0x02000000, 0x12000000 );
   110     mem_map_region( NULL,            0x10800000, 8 MB,   MEM_REGION_PVR2YUV,      &mem_region_pvr2yuv, 0, 0x02000000, 0x12800000 );
   111     mem_map_region( NULL,            0x11000000, 16 MB,  MEM_REGION_PVR2VDMA1,    &mem_region_pvr2vdma1, 0, 16 MB, 0 );
   112     mem_map_region( NULL,            0x13000000, 16 MB,  MEM_REGION_PVR2VDMA2,    &mem_region_pvr2vdma2, 0, 16 MB, 0 );
   114     dreamcast_use_bios = use_bootrom;
   115     dreamcast_has_bios = dreamcast_load_bios( bios_path );
   116     if( !dreamcast_has_bios ) {
   117         dreamcast_load_fakebios();
   118     }
   120     if( flash_path != NULL && flash_path[0] != '\0' ) {
   121         mem_load_block( flash_path, 0x00200000, 0x00020000 );
   122     }
   123     dreamcast_has_flash = TRUE;
   125     /* Load in the rest of the core modules */
   126     dreamcast_register_module( &sh4_module );
   127     dreamcast_register_module( &asic_module );
   128     dreamcast_register_module( &pvr2_module );
   129     dreamcast_register_module( &aica_module );
   130     dreamcast_register_module( &maple_module );
   131     dreamcast_register_module( &ide_module );
   132     dreamcast_register_module( &eventq_module );
   134     g_free(bios_path);
   135     g_free(flash_path);
   136 }
   138 gboolean dreamcast_load_bios( const gchar *filename )
   139 {
   140     if( dreamcast_use_bios ) {
   141         dreamcast_has_bios = mem_load_rom( dc_boot_rom, filename, 2 MB, 0x89f2b1a1 );
   142     } else {
   143         dreamcast_has_bios = FALSE;
   144     }
   145     return dreamcast_has_bios;
   146 }
   148 static const char fakebios[] = {
   149         0x00, 0xd1, /* movl $+4, r1 */
   150         0x2b, 0x41, /* jmp @r1 */
   151         0xa0, 0xff, /* .long 0xffffffa0 */
   152         0xff, 0xff };
   153 gboolean dreamcast_load_fakebios( )
   154 {
   155     memset( dc_boot_rom, 0, 2 MB );
   156     memcpy( dc_boot_rom, fakebios, sizeof(fakebios) );
   157     syscall_add_hook( 0xA0, bios_boot );
   158     dreamcast_has_bios = TRUE;
   159     return TRUE;
   160 }
   162 gboolean dreamcast_load_flash( const gchar *filename )
   163 {
   164     if( filename != NULL && filename[0] != '\0' ) {
   165         return mem_load_block( filename, 0x00200000, 0x00020000 ) == 0;
   166     }
   167     return FALSE;
   168 }
   171 gboolean dreamcast_config_changed(void *data, struct lxdream_config_group *group, unsigned item,
   172                                        const gchar *oldval, const gchar *newval)
   173 {
   174     gchar *tmp;
   175     switch(item) {
   176     case CONFIG_BIOS_PATH:
   177         tmp = get_expanded_path(newval);
   178         dreamcast_load_bios(tmp);
   179         g_free(tmp);
   180         break;
   181     case CONFIG_FLASH_PATH:
   182         tmp = get_expanded_path(newval);
   183         dreamcast_load_flash(tmp);
   184         g_free(tmp);
   185         break;
   186     }
   187     reset_gui_paths();
   188     return TRUE;
   189 }
   191 void dreamcast_save_flash()
   192 {
   193     if( dreamcast_has_flash ) {
   194         char *file = lxdream_get_global_config_path_value(CONFIG_FLASH_PATH);
   195         mem_save_block( file, 0x00200000, 0x00020000 );
   196         g_free(file);
   197     }
   198 }
   200 /**
   201  * Constructs a system configuration for the AICA in standalone mode,
   202  * ie sound chip only.
   203  */
   204 void dreamcast_configure_aica_only( )
   205 {
   206     dreamcast_register_module( &mem_module );
   207     mem_map_region( aica_main_ram, 0x00800000, 2 MB, MEM_REGION_AUDIO, &mem_region_audioram, MEM_FLAG_RAM, 2 MB, 0 );
   208     mem_map_region( aica_scratch_ram, 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH, &mem_region_audioscratch, MEM_FLAG_RAM, 8 KB, 0 );
   209     dreamcast_register_module( &aica_module );
   210     aica_enable();
   211     dreamcast_state = STATE_STOPPED;
   212 }
   214 void dreamcast_register_module( dreamcast_module_t module ) 
   215 {
   216     modules[num_modules++] = module;
   217     if( module->init != NULL )
   218         module->init();
   219 }
   221 void dreamcast_set_run_time( uint32_t secs, uint32_t nanosecs )
   222 {
   223     run_time_nanosecs = (((uint64_t)secs) * 1000000000) + nanosecs;
   224 }
   226 void dreamcast_set_exit_on_stop( gboolean flag )
   227 {
   228     dreamcast_exit_on_stop = flag;
   229 }
   231 void dreamcast_init( gboolean use_bootrom )
   232 {
   233     dreamcast_configure( use_bootrom );
   234     dreamcast_state = STATE_STOPPED;
   235 }
   237 void dreamcast_reset( void )
   238 {
   239     sh4_core_exit(CORE_EXIT_SYSRESET);
   240     int i;
   241     for( i=0; i<num_modules; i++ ) {
   242         if( modules[i]->reset != NULL )
   243             modules[i]->reset();
   244     }
   245 }
   247 void dreamcast_run( void )
   248 {
   249     int i;
   251     if( !dreamcast_can_run() ) {
   252         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"));
   253         return;
   254     }
   256     if( dreamcast_state != STATE_RUNNING ) {
   257         for( i=0; i<num_modules; i++ ) {
   258             if( modules[i]->start != NULL )
   259                 modules[i]->start();
   260         }
   261     }
   263     if( maple_should_grab() ) {
   264         gui_set_use_grab(TRUE);
   265     }
   267     dreamcast_state = STATE_RUNNING;
   269     if( run_time_nanosecs != 0 ) {
   270         while( dreamcast_state == STATE_RUNNING ) {
   271             uint32_t time_to_run = timeslice_length;
   272             if( run_time_nanosecs < time_to_run ) {
   273                 time_to_run = (uint32_t)run_time_nanosecs;
   274             }
   276             for( i=0; i<num_modules; i++ ) {
   277                 if( modules[i]->run_time_slice != NULL )
   278                     time_to_run = modules[i]->run_time_slice( time_to_run );
   279             }
   281             if( run_time_nanosecs > time_to_run ) {
   282                 run_time_nanosecs -= time_to_run;
   283             } else {
   284                 run_time_nanosecs = 0; // Finished
   285                 break;
   286             }
   287         }
   288     } else {
   289         while( dreamcast_state == STATE_RUNNING ) {
   290             int time_to_run = timeslice_length;
   291             for( i=0; i<num_modules; i++ ) {
   292                 if( modules[i]->run_time_slice != NULL )
   293                     time_to_run = modules[i]->run_time_slice( time_to_run );
   294             }
   296         }
   297     }
   299     gui_set_use_grab(FALSE);
   301     for( i=0; i<num_modules; i++ ) {
   302         if( modules[i]->stop != NULL )
   303             modules[i]->stop();
   304     }
   306     vmulist_save_all();
   307     dreamcast_state = STATE_STOPPED;
   309     if( dreamcast_exit_on_stop ) {
   310         dreamcast_shutdown();
   311         exit(0);
   312     }
   313 }
   315 void dreamcast_stop( void )
   316 {
   317     sh4_core_exit(CORE_EXIT_HALT); // returns only if not inside SH4 core
   318     if( dreamcast_state == STATE_RUNNING )
   319         dreamcast_state = STATE_STOPPING;
   320 }
   322 void dreamcast_shutdown()
   323 {
   324     // Don't do a dreamcast_stop - if we're calling this out of SH4 code,
   325     // it's a shutdown-and-quit event
   326     if( dreamcast_state == STATE_RUNNING )
   327         dreamcast_state = STATE_STOPPING;
   328     dreamcast_save_flash();
   329     vmulist_save_all();
   330 #ifdef ENABLE_SH4STATS
   331     sh4_stats_print(stdout);
   332 #endif
   333 }
   335 void dreamcast_program_loaded( const gchar *name, sh4addr_t entry_point )
   336 {
   337     if( dreamcast_program_name != NULL ) {
   338         g_free(dreamcast_program_name);
   339     }
   340     dreamcast_program_name = g_strdup(name);
   341     dreamcast_entry_point = entry_point;
   342     sh4_set_pc(entry_point);
   343     sh4_write_sr( sh4_read_sr() & (~SR_BL) ); /* Unmask interrupts */
   344     bios_install();
   345     dcload_install();
   346     gui_update_state();
   347 }
   349 gboolean dreamcast_is_running( void )
   350 {
   351     return dreamcast_state == STATE_RUNNING;
   352 }
   354 gboolean dreamcast_can_run(void)
   355 {
   356     return dreamcast_state != STATE_UNINIT;
   357 }
   359 /********************************* Save States *****************************/
   361 struct save_state_header {
   362     char magic[16];
   363     uint32_t version;
   364     uint32_t module_count;
   365 };
   367 struct chunk_header {
   368     char marker[4]; /* Always BLCK */
   369     char name[8]; /* Block (module) name */
   370     uint32_t block_length;
   371 };
   373 /**
   374  * Check the save state header to ensure that it is a valid, supported
   375  * file. 
   376  * @return the number of blocks following, or 0 if the file is invalid.
   377  */
   378 int dreamcast_read_save_state_header( FILE *f, char *error, int errorlen )
   379 {
   380     struct save_state_header header;
   381     if( fread( &header, sizeof(header), 1, f ) != 1 ) {
   382         return 0;
   383     }
   384     if( strncmp( header.magic, DREAMCAST_SAVE_MAGIC, 16 ) != 0 ) {
   385     	if( error != NULL )
   386     		snprintf( error, errorlen, _("File is not a %s save state"), APP_NAME );
   387         return 0;
   388     }
   389     if( header.version != DREAMCAST_SAVE_VERSION ) {
   390     	if( error != NULL )
   391     		snprintf( error, errorlen, _("Unsupported %s save state version"), APP_NAME );
   392         return 0;
   393     }
   394     if( header.module_count > MAX_MODULES ) {
   395     	if( error != NULL )
   396     		snprintf( error, errorlen, _("%s save state is corrupted (bad module count)"), APP_NAME );
   397         return 0;
   398     }
   399     return header.module_count;
   400 }
   402 int dreamcast_write_chunk_header( const gchar *name, uint32_t length, FILE *f )
   403 {
   404     struct chunk_header head;
   406     memcpy( head.marker, "BLCK", 4 );
   407     memset( head.name, 0, 8 );
   408     memcpy( head.name, name, strlen(name) );
   409     head.block_length = length;
   410     return fwrite( &head, sizeof(head), 1, f );
   411 }
   414 frame_buffer_t dreamcast_load_preview( const gchar *filename )
   415 {
   416     int i;
   417     FILE *f = fopen( filename, "r" );
   418     if( f == NULL ) return NULL;
   420     int module_count = dreamcast_read_save_state_header(f, NULL, 0);
   421     if( module_count <= 0 ) {
   422         fclose(f);
   423         return NULL;
   424     }
   425     for( i=0; i<module_count; i++ ) {
   426         struct chunk_header head;
   427         if( fread( &head, sizeof(head), 1, f ) != 1 ) {
   428             fclose(f);
   429             return NULL;
   430         }
   431         if( memcmp("BLCK", head.marker, 4) != 0 ) {
   432             fclose(f);
   433             return NULL;
   434         }
   436         if( strcmp("PVR2", head.name) == 0 ) {
   437             uint32_t buf_count;
   438             int has_front;
   439             fread( &buf_count, sizeof(buf_count), 1, f );
   440             fread( &has_front, sizeof(has_front), 1, f );
   441             if( buf_count != 0 && has_front ) {
   442                 frame_buffer_t result = read_png_from_stream(f);
   443                 fclose(f);
   444                 return result;
   445             }
   446             break;
   447         } else {
   448             fseek( f, head.block_length, SEEK_CUR );
   449         }
   450     }
   451     return NULL;
   452 }
   454 gboolean dreamcast_load_state( const gchar *filename )
   455 {
   456     int i,j;
   457     int module_count;
   458     char error[128];
   459     int have_read[MAX_MODULES];
   461     FILE *f = fopen( filename, "r" );
   462     if( f == NULL ) return FALSE;
   464     module_count = dreamcast_read_save_state_header(f, error, sizeof(error));
   465     if( module_count <= 0 ) {
   466     	ERROR( error );
   467         fclose(f);
   468         return FALSE;
   469     }
   471     for( i=0; i<MAX_MODULES; i++ ) {
   472         have_read[i] = 0;
   473     }
   475     for( i=0; i<module_count; i++ ) {
   476         struct chunk_header chunk;
   477         fread( &chunk, sizeof(chunk), 1, f );
   478         if( strncmp(chunk.marker, "BLCK", 4) != 0 ) {
   479             ERROR( "%s save state is corrupted (missing block header %d)", APP_NAME, i );
   480             fclose(f);
   481             return FALSE;
   482         }
   484         /* Find the matching module by name */
   485         for( j=0; j<num_modules; j++ ) {
   486             if( strcmp(modules[j]->name,chunk.name) == 0 ) {
   487                 have_read[j] = 1;
   488                 if( modules[j]->load == NULL ) {
   489                     ERROR( "%s save state is corrupted (no loader for %s)", APP_NAME, modules[j]->name );
   490                     fclose(f);
   491                     return FALSE;
   492                 } else if( modules[j]->load(f) != 0 ) {
   493                     ERROR( "%s save state is corrupted (%s failed)", APP_NAME, modules[j]->name );
   494                     fclose(f);
   495                     return FALSE;
   496                 }
   497                 break;
   498             }
   499         }
   500         if( j == num_modules ) {
   501             fclose(f);
   502             ERROR( "%s save state contains unrecognized section", APP_NAME );
   503             return FALSE;
   504         }
   505     }
   507     /* Any modules that we didn't load - reset to the default state.
   508      * (ie it's not an error to skip a module if you don't actually
   509      * care about its state).
   510      */
   511     for( j=0; j<num_modules; j++ ) {
   512         if( have_read[j] == 0 && modules[j]->reset != NULL ) {
   513             modules[j]->reset();
   514         }
   515     }
   516     fclose(f);
   517     INFO( "Save state read from %s", filename );
   518     return TRUE;
   519 }
   521 int dreamcast_save_state( const gchar *filename )
   522 {
   523     int i;
   524     FILE *f;
   525     struct save_state_header header;
   527     f = fopen( filename, "w" );
   528     if( f == NULL )
   529         return errno;
   530     strcpy( header.magic, DREAMCAST_SAVE_MAGIC );
   531     header.version = DREAMCAST_SAVE_VERSION;
   532     header.module_count = 0;
   534     for( i=0; i<num_modules; i++ ) {
   535         if( modules[i]->save != NULL )
   536             header.module_count++;
   537     }
   538     fwrite( &header, sizeof(header), 1, f );
   539     for( i=0; i<num_modules; i++ ) {
   540         if( modules[i]->save != NULL ) {
   541             uint32_t blocklen, posn1, posn2;
   542             dreamcast_write_chunk_header( modules[i]->name, 0, f );
   543             posn1 = ftell(f);
   544             modules[i]->save(f);
   545             posn2 = ftell(f);
   546             blocklen = posn2 - posn1;
   547             fseek( f, posn1-4, SEEK_SET );
   548             fwrite( &blocklen, sizeof(blocklen), 1, f );
   549             fseek( f, posn2, SEEK_SET );
   550         }
   551     }
   552     fclose( f );
   553     INFO( "Save state written to %s", filename );
   554     return 0;
   555 }
   557 /********************** Quick save state support ***********************/
   558 /* This section doesn't necessarily belong here, but it probably makes the
   559  * most sense here next to the regular save/load functions
   560  */
   562 static gchar *get_quick_state_filename( int state )
   563 {
   564     gchar *path = lxdream_get_global_config_path_value(CONFIG_SAVE_PATH);
   565     gchar *str = g_strdup_printf( QUICK_STATE_FILENAME, path, state );
   566     g_free( path );
   567     return str;
   568 }
   571 static void dreamcast_quick_state_init()
   572 {
   573     const char *state = lxdream_get_global_config_value(CONFIG_QUICK_STATE);
   574     if( state != NULL ) {
   575         quick_save_state = atoi(state);
   576         if( quick_save_state > MAX_QUICK_STATE ) {
   577             quick_save_state = 0;
   578         }
   579     } else {
   580         quick_save_state = 0;
   581     }
   582 }
   584 void dreamcast_quick_save()
   585 {
   586     if( quick_save_state == -1 ) 
   587         dreamcast_quick_state_init();
   588     gchar *str = get_quick_state_filename(quick_save_state);
   589     dreamcast_save_state(str);
   590     g_free(str);
   591 }
   593 void dreamcast_quick_load()
   594 {
   595     if( quick_save_state == -1 ) 
   596         dreamcast_quick_state_init();
   597     gchar *str = get_quick_state_filename(quick_save_state);
   598     dreamcast_load_state(str);
   599     g_free(str);
   600 }
   602 unsigned int dreamcast_get_quick_state( )
   603 {
   604     if( quick_save_state == -1 ) 
   605         dreamcast_quick_state_init();
   606     return quick_save_state;
   607 }
   609 void dreamcast_set_quick_state( unsigned int state )
   610 {
   611     if( state <= MAX_QUICK_STATE && state != quick_save_state ) {
   612         quick_save_state = state;
   613         char buf[3];
   614         sprintf( buf, "%d", quick_save_state );
   615         lxdream_set_global_config_value(CONFIG_QUICK_STATE, buf);
   616         lxdream_save_config();
   617     }
   618 }
   620 gboolean dreamcast_has_quick_state( unsigned int state )
   621 {
   622     gchar *str = get_quick_state_filename(state);
   623     int result = access(str, R_OK);
   624     g_free(str);
   625     return result == 0 ? TRUE : FALSE;
   626 }
   628 /********************* The Boot ROM address space **********************/
   629 static int32_t FASTCALL ext_bootrom_read_long( sh4addr_t addr )
   630 {
   631     return *((int32_t *)(dc_boot_rom + (addr&0x001FFFFF)));
   632 }
   633 static int32_t FASTCALL ext_bootrom_read_word( sh4addr_t addr )
   634 {
   635     return SIGNEXT16(*((int16_t *)(dc_boot_rom + (addr&0x001FFFFF))));
   636 }
   637 static int32_t FASTCALL ext_bootrom_read_byte( sh4addr_t addr )
   638 {
   639     return SIGNEXT8(*((int16_t *)(dc_boot_rom + (addr&0x001FFFFF))));
   640 }
   641 static void FASTCALL ext_bootrom_read_burst( unsigned char *dest, sh4addr_t addr )
   642 {
   643     memcpy( dest, dc_boot_rom +(addr&0x001FFFFF), 32 );
   644 }
   646 struct mem_region_fn mem_region_bootrom = { 
   647         ext_bootrom_read_long, unmapped_write_long, 
   648         ext_bootrom_read_word, unmapped_write_long, 
   649         ext_bootrom_read_byte, unmapped_write_long, 
   650         ext_bootrom_read_burst, unmapped_write_burst }; 
   652 /********************* The Flash RAM address space **********************/
   653 static int32_t FASTCALL ext_flashram_read_long( sh4addr_t addr )
   654 {
   655     return *((int32_t *)(dc_flash_ram + (addr&0x0001FFFF)));
   656 }
   657 static int32_t FASTCALL ext_flashram_read_word( sh4addr_t addr )
   658 {
   659     return SIGNEXT16(*((int16_t *)(dc_flash_ram + (addr&0x0001FFFF))));
   660 }
   661 static int32_t FASTCALL ext_flashram_read_byte( sh4addr_t addr )
   662 {
   663     return SIGNEXT8(*((int16_t *)(dc_flash_ram + (addr&0x0001FFFF))));
   664 }
   665 static void FASTCALL ext_flashram_write_long( sh4addr_t addr, uint32_t val )
   666 {
   667     *(uint32_t *)(dc_flash_ram + (addr&0x0001FFFF)) = val;
   668     asic_g2_write_word();
   669 }
   670 static void FASTCALL ext_flashram_write_word( sh4addr_t addr, uint32_t val )
   671 {
   672     *(uint16_t *)(dc_flash_ram + (addr&0x0001FFFF)) = (uint16_t)val;
   673     asic_g2_write_word();
   674 }
   675 static void FASTCALL ext_flashram_write_byte( sh4addr_t addr, uint32_t val )
   676 {
   677     *(uint8_t *)(dc_flash_ram + (addr&0x0001FFFF)) = (uint8_t)val;
   678     asic_g2_write_word();
   679 }
   680 static void FASTCALL ext_flashram_read_burst( unsigned char *dest, sh4addr_t addr )
   681 {
   682     memcpy( dest, dc_flash_ram+(addr&0x0001FFFF), 32 );
   683 }
   684 static void FASTCALL ext_flashram_write_burst( sh4addr_t addr, unsigned char *src )
   685 {
   686     memcpy( dc_flash_ram+(addr&0x0001FFFF), src, 32 );
   687 }
   689 struct mem_region_fn mem_region_flashram = { ext_flashram_read_long, ext_flashram_write_long, 
   690         ext_flashram_read_word, ext_flashram_write_word, 
   691         ext_flashram_read_byte, ext_flashram_write_byte, 
   692         ext_flashram_read_burst, ext_flashram_write_burst }; 
.