filename | src/dreamcast.c |
changeset | 1041:5fcc39857c5c |
prev | 1038:f220d18c0615 |
next | 1065:bc1cc0c54917 |
author | nkeynes |
date | Sun Jun 28 12:07:21 2009 +0000 (14 years ago) |
permissions | -rw-r--r-- |
last change | Fix handling of rename failure Fix boneheadedness in get_filename_at |
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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_has_bios = FALSE;
47 static gboolean dreamcast_has_flash = FALSE;
48 static gboolean dreamcast_exit_on_stop = FALSE;
49 static gchar *dreamcast_program_name = NULL;
50 static sh4addr_t dreamcast_entry_point = 0xA0000000;
51 static uint32_t timeslice_length = DEFAULT_TIMESLICE_LENGTH;
52 static uint64_t run_time_nanosecs = 0;
53 static unsigned int quick_save_state = -1;
55 #define MAX_MODULES 32
56 static int num_modules = 0;
57 dreamcast_module_t modules[MAX_MODULES];
59 /**
60 * The unknown module is used for logging files without an actual module
61 * declaration
62 */
63 struct dreamcast_module unknown_module = { "****", NULL, NULL, NULL, NULL,
64 NULL, NULL, NULL };
66 extern struct mem_region_fn mem_region_sdram;
67 extern struct mem_region_fn mem_region_vram32;
68 extern struct mem_region_fn mem_region_vram64;
69 extern struct mem_region_fn mem_region_audioram;
70 extern struct mem_region_fn mem_region_audioscratch;
71 extern struct mem_region_fn mem_region_flashram;
72 extern struct mem_region_fn mem_region_bootrom;
73 extern struct mem_region_fn mem_region_pvr2ta;
74 extern struct mem_region_fn mem_region_pvr2yuv;
75 extern struct mem_region_fn mem_region_pvr2vdma1;
76 extern struct mem_region_fn mem_region_pvr2vdma2;
78 unsigned char dc_main_ram[16 MB];
79 unsigned char dc_boot_rom[2 MB];
80 unsigned char dc_flash_ram[128 KB];
82 /**
83 * This function is responsible for defining how all the pieces of the
84 * dreamcast actually fit together.
85 *
86 * Note currently the locations of the various MMIO pages are hard coded in
87 * the MMIO definitions - they should probably be moved here.
88 */
89 void dreamcast_configure( )
90 {
91 char *bios_path = lxdream_get_global_config_path_value(CONFIG_BIOS_PATH);
92 char *flash_path = lxdream_get_global_config_path_value(CONFIG_FLASH_PATH);
94 dreamcast_register_module( &eventq_module );
95 /* Register the memory framework */
96 dreamcast_register_module( &mem_module );
98 /* Setup standard memory map */
99 mem_map_region( dc_boot_rom, 0x00000000, 2 MB, MEM_REGION_BIOS, &mem_region_bootrom, MEM_FLAG_ROM, 2 MB, 0 );
100 mem_map_region( dc_flash_ram, 0x00200000, 128 KB, MEM_REGION_FLASH, &mem_region_flashram, MEM_FLAG_RAM, 128 KB, 0 );
101 mem_map_region( aica_main_ram, 0x00800000, 2 MB, MEM_REGION_AUDIO, &mem_region_audioram, MEM_FLAG_RAM, 2 MB, 0 );
102 mem_map_region( aica_scratch_ram,0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH,&mem_region_audioscratch, MEM_FLAG_RAM, 8 KB, 0 );
103 mem_map_region( NULL, 0x04000000, 8 MB, MEM_REGION_VIDEO64, &mem_region_vram64, 0, 8 MB, 0 );
104 mem_map_region( pvr2_main_ram, 0x05000000, 8 MB, MEM_REGION_VIDEO, &mem_region_vram32, MEM_FLAG_RAM, 8 MB, 0 );
105 mem_map_region( dc_main_ram, 0x0C000000, 16 MB, MEM_REGION_MAIN, &mem_region_sdram, MEM_FLAG_RAM, 0x01000000, 0x0F000000 );
106 mem_map_region( NULL, 0x10000000, 8 MB, MEM_REGION_PVR2TA, &mem_region_pvr2ta, 0, 0x02000000, 0x12000000 );
107 mem_map_region( NULL, 0x10800000, 8 MB, MEM_REGION_PVR2YUV, &mem_region_pvr2yuv, 0, 0x02000000, 0x12800000 );
108 mem_map_region( NULL, 0x11000000, 16 MB, MEM_REGION_PVR2VDMA1, &mem_region_pvr2vdma1, 0, 16 MB, 0 );
109 mem_map_region( NULL, 0x13000000, 16 MB, MEM_REGION_PVR2VDMA2, &mem_region_pvr2vdma2, 0, 16 MB, 0 );
111 dreamcast_has_bios = mem_load_rom( dc_boot_rom, bios_path, 2 MB, 0x89f2b1a1 );
112 if( flash_path != NULL && flash_path[0] != '\0' ) {
113 mem_load_block( flash_path, 0x00200000, 0x00020000 );
114 }
115 dreamcast_has_flash = TRUE;
117 /* Load in the rest of the core modules */
118 dreamcast_register_module( &sh4_module );
119 dreamcast_register_module( &asic_module );
120 dreamcast_register_module( &pvr2_module );
121 dreamcast_register_module( &aica_module );
122 dreamcast_register_module( &maple_module );
123 dreamcast_register_module( &ide_module );
125 g_free(bios_path);
126 g_free(flash_path);
127 }
129 void dreamcast_config_changed(void)
130 {
131 char *bios_path = lxdream_get_global_config_path_value(CONFIG_BIOS_PATH);
132 char *flash_path = lxdream_get_global_config_path_value(CONFIG_FLASH_PATH);
133 dreamcast_has_bios = mem_load_rom( dc_boot_rom, bios_path, 2 MB, 0x89f2b1a1 );
134 if( flash_path != NULL && flash_path[0] != '\0' ) {
135 mem_load_block( flash_path, 0x00200000, 0x00020000 );
136 }
137 g_free(bios_path);
138 g_free(flash_path);
139 reset_gui_paths();
140 }
142 void dreamcast_save_flash()
143 {
144 if( dreamcast_has_flash ) {
145 char *file = lxdream_get_global_config_path_value(CONFIG_FLASH_PATH);
146 mem_save_block( file, 0x00200000, 0x00020000 );
147 g_free(file);
148 }
149 }
151 /**
152 * Constructs a system configuration for the AICA in standalone mode,
153 * ie sound chip only.
154 */
155 void dreamcast_configure_aica_only( )
156 {
157 dreamcast_register_module( &mem_module );
158 mem_map_region( aica_main_ram, 0x00800000, 2 MB, MEM_REGION_AUDIO, &mem_region_audioram, MEM_FLAG_RAM, 2 MB, 0 );
159 mem_map_region( aica_scratch_ram, 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH, &mem_region_audioscratch, MEM_FLAG_RAM, 8 KB, 0 );
160 dreamcast_register_module( &aica_module );
161 aica_enable();
162 dreamcast_state = STATE_STOPPED;
163 }
165 void dreamcast_register_module( dreamcast_module_t module )
166 {
167 modules[num_modules++] = module;
168 if( module->init != NULL )
169 module->init();
170 }
172 void dreamcast_set_run_time( uint32_t secs, uint32_t nanosecs )
173 {
174 run_time_nanosecs = (((uint64_t)secs) * 1000000000) + nanosecs;
175 }
177 void dreamcast_set_exit_on_stop( gboolean flag )
178 {
179 dreamcast_exit_on_stop = flag;
180 }
182 void dreamcast_init( void )
183 {
184 dreamcast_configure();
185 dreamcast_state = STATE_STOPPED;
186 }
188 void dreamcast_reset( void )
189 {
190 sh4_core_exit(CORE_EXIT_SYSRESET);
191 int i;
192 for( i=0; i<num_modules; i++ ) {
193 if( modules[i]->reset != NULL )
194 modules[i]->reset();
195 }
196 }
198 void dreamcast_run( void )
199 {
200 int i;
202 if( !dreamcast_can_run() ) {
203 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"));
204 return;
205 }
207 if( dreamcast_state != STATE_RUNNING ) {
208 for( i=0; i<num_modules; i++ ) {
209 if( modules[i]->start != NULL )
210 modules[i]->start();
211 }
212 }
214 if( maple_should_grab() ) {
215 gui_set_use_grab(TRUE);
216 }
218 dreamcast_state = STATE_RUNNING;
220 if( run_time_nanosecs != 0 ) {
221 while( dreamcast_state == STATE_RUNNING ) {
222 uint32_t time_to_run = timeslice_length;
223 if( run_time_nanosecs < time_to_run ) {
224 time_to_run = (uint32_t)run_time_nanosecs;
225 }
227 for( i=0; i<num_modules; i++ ) {
228 if( modules[i]->run_time_slice != NULL )
229 time_to_run = modules[i]->run_time_slice( time_to_run );
230 }
232 if( run_time_nanosecs > time_to_run ) {
233 run_time_nanosecs -= time_to_run;
234 } else {
235 run_time_nanosecs = 0; // Finished
236 break;
237 }
238 }
239 } else {
240 while( dreamcast_state == STATE_RUNNING ) {
241 int time_to_run = timeslice_length;
242 for( i=0; i<num_modules; i++ ) {
243 if( modules[i]->run_time_slice != NULL )
244 time_to_run = modules[i]->run_time_slice( time_to_run );
245 }
247 }
248 }
250 gui_set_use_grab(FALSE);
252 for( i=0; i<num_modules; i++ ) {
253 if( modules[i]->stop != NULL )
254 modules[i]->stop();
255 }
257 vmulist_save_all();
258 dreamcast_state = STATE_STOPPED;
260 if( dreamcast_exit_on_stop ) {
261 dreamcast_shutdown();
262 exit(0);
263 }
264 }
266 void dreamcast_stop( void )
267 {
268 sh4_core_exit(CORE_EXIT_HALT); // returns only if not inside SH4 core
269 if( dreamcast_state == STATE_RUNNING )
270 dreamcast_state = STATE_STOPPING;
271 }
273 void dreamcast_shutdown()
274 {
275 // Don't do a dreamcast_stop - if we're calling this out of SH4 code,
276 // it's a shutdown-and-quit event
277 if( dreamcast_state == STATE_RUNNING )
278 dreamcast_state = STATE_STOPPING;
279 dreamcast_save_flash();
280 vmulist_save_all();
281 #ifdef ENABLE_SH4STATS
282 sh4_stats_print(stdout);
283 #endif
284 }
286 void dreamcast_program_loaded( const gchar *name, sh4addr_t entry_point )
287 {
288 if( dreamcast_program_name != NULL ) {
289 g_free(dreamcast_program_name);
290 }
291 dreamcast_program_name = g_strdup(name);
292 dreamcast_entry_point = entry_point;
293 sh4_set_pc(entry_point);
294 sh4_write_sr( sh4_read_sr() & (~SR_BL) ); /* Unmask interrupts */
295 bios_install();
296 dcload_install();
297 gui_update_state();
298 }
300 gboolean dreamcast_is_running( void )
301 {
302 return dreamcast_state == STATE_RUNNING;
303 }
305 gboolean dreamcast_can_run(void)
306 {
307 return dreamcast_state != STATE_UNINIT &&
308 (dreamcast_has_bios || dreamcast_program_name != NULL);
309 }
311 /********************************* Save States *****************************/
313 struct save_state_header {
314 char magic[16];
315 uint32_t version;
316 uint32_t module_count;
317 };
319 struct chunk_header {
320 char marker[4]; /* Always BLCK */
321 char name[8]; /* Block (module) name */
322 uint32_t block_length;
323 };
325 /**
326 * Check the save state header to ensure that it is a valid, supported
327 * file.
328 * @return the number of blocks following, or 0 if the file is invalid.
329 */
330 int dreamcast_read_save_state_header( FILE *f, char *error, int errorlen )
331 {
332 struct save_state_header header;
333 if( fread( &header, sizeof(header), 1, f ) != 1 ) {
334 return 0;
335 }
336 if( strncmp( header.magic, DREAMCAST_SAVE_MAGIC, 16 ) != 0 ) {
337 if( error != NULL )
338 snprintf( error, errorlen, _("File is not a %s save state"), APP_NAME );
339 return 0;
340 }
341 if( header.version != DREAMCAST_SAVE_VERSION ) {
342 if( error != NULL )
343 snprintf( error, errorlen, _("Unsupported %s save state version"), APP_NAME );
344 return 0;
345 }
346 if( header.module_count > MAX_MODULES ) {
347 if( error != NULL )
348 snprintf( error, errorlen, _("%s save state is corrupted (bad module count)"), APP_NAME );
349 return 0;
350 }
351 return header.module_count;
352 }
354 int dreamcast_write_chunk_header( const gchar *name, uint32_t length, FILE *f )
355 {
356 struct chunk_header head;
358 memcpy( head.marker, "BLCK", 4 );
359 memset( head.name, 0, 8 );
360 memcpy( head.name, name, strlen(name) );
361 head.block_length = length;
362 return fwrite( &head, sizeof(head), 1, f );
363 }
366 frame_buffer_t dreamcast_load_preview( const gchar *filename )
367 {
368 int i;
369 FILE *f = fopen( filename, "r" );
370 if( f == NULL ) return NULL;
372 int module_count = dreamcast_read_save_state_header(f, NULL, 0);
373 if( module_count <= 0 ) {
374 fclose(f);
375 return NULL;
376 }
377 for( i=0; i<module_count; i++ ) {
378 struct chunk_header head;
379 if( fread( &head, sizeof(head), 1, f ) != 1 ) {
380 fclose(f);
381 return NULL;
382 }
383 if( memcmp("BLCK", head.marker, 4) != 0 ) {
384 fclose(f);
385 return NULL;
386 }
388 if( strcmp("PVR2", head.name) == 0 ) {
389 uint32_t buf_count;
390 int has_front;
391 fread( &buf_count, sizeof(buf_count), 1, f );
392 fread( &has_front, sizeof(has_front), 1, f );
393 if( buf_count != 0 && has_front ) {
394 frame_buffer_t result = read_png_from_stream(f);
395 fclose(f);
396 return result;
397 }
398 break;
399 } else {
400 fseek( f, head.block_length, SEEK_CUR );
401 }
402 }
403 return NULL;
404 }
406 int dreamcast_load_state( const gchar *filename )
407 {
408 int i,j;
409 int module_count;
410 char error[128];
411 int have_read[MAX_MODULES];
413 FILE *f = fopen( filename, "r" );
414 if( f == NULL ) return errno;
416 module_count = dreamcast_read_save_state_header(f, error, sizeof(error));
417 if( module_count <= 0 ) {
418 ERROR( error );
419 fclose(f);
420 return 1;
421 }
423 for( i=0; i<MAX_MODULES; i++ ) {
424 have_read[i] = 0;
425 }
427 for( i=0; i<module_count; i++ ) {
428 struct chunk_header chunk;
429 fread( &chunk, sizeof(chunk), 1, f );
430 if( strncmp(chunk.marker, "BLCK", 4) != 0 ) {
431 ERROR( "%s save state is corrupted (missing block header %d)", APP_NAME, i );
432 fclose(f);
433 return 2;
434 }
436 /* Find the matching module by name */
437 for( j=0; j<num_modules; j++ ) {
438 if( strcmp(modules[j]->name,chunk.name) == 0 ) {
439 have_read[j] = 1;
440 if( modules[j]->load == NULL ) {
441 ERROR( "%s save state is corrupted (no loader for %s)", APP_NAME, modules[j]->name );
442 fclose(f);
443 return 2;
444 } else if( modules[j]->load(f) != 0 ) {
445 ERROR( "%s save state is corrupted (%s failed)", APP_NAME, modules[j]->name );
446 fclose(f);
447 return 2;
448 }
449 break;
450 }
451 }
452 if( j == num_modules ) {
453 fclose(f);
454 ERROR( "%s save state contains unrecognized section", APP_NAME );
455 return 2;
456 }
457 }
459 /* Any modules that we didn't load - reset to the default state.
460 * (ie it's not an error to skip a module if you don't actually
461 * care about its state).
462 */
463 for( j=0; j<num_modules; j++ ) {
464 if( have_read[j] == 0 && modules[j]->reset != NULL ) {
465 modules[j]->reset();
466 }
467 }
468 fclose(f);
469 INFO( "Save state read from %s", filename );
470 return 0;
471 }
473 int dreamcast_save_state( const gchar *filename )
474 {
475 int i;
476 FILE *f;
477 struct save_state_header header;
479 f = fopen( filename, "w" );
480 if( f == NULL )
481 return errno;
482 strcpy( header.magic, DREAMCAST_SAVE_MAGIC );
483 header.version = DREAMCAST_SAVE_VERSION;
484 header.module_count = 0;
486 for( i=0; i<num_modules; i++ ) {
487 if( modules[i]->save != NULL )
488 header.module_count++;
489 }
490 fwrite( &header, sizeof(header), 1, f );
491 for( i=0; i<num_modules; i++ ) {
492 if( modules[i]->save != NULL ) {
493 uint32_t blocklen, posn1, posn2;
494 dreamcast_write_chunk_header( modules[i]->name, 0, f );
495 posn1 = ftell(f);
496 modules[i]->save(f);
497 posn2 = ftell(f);
498 blocklen = posn2 - posn1;
499 fseek( f, posn1-4, SEEK_SET );
500 fwrite( &blocklen, sizeof(blocklen), 1, f );
501 fseek( f, posn2, SEEK_SET );
502 }
503 }
504 fclose( f );
505 INFO( "Save state written to %s", filename );
506 return 0;
507 }
509 /********************** Quick save state support ***********************/
510 /* This section doesn't necessarily belong here, but it probably makes the
511 * most sense here next to the regular save/load functions
512 */
514 static gchar *get_quick_state_filename( int state )
515 {
516 gchar *path = lxdream_get_global_config_path_value(CONFIG_SAVE_PATH);
517 gchar *str = g_strdup_printf( QUICK_STATE_FILENAME, path, state );
518 g_free( path );
519 return str;
520 }
523 static void dreamcast_quick_state_init()
524 {
525 const char *state = lxdream_get_global_config_value(CONFIG_QUICK_STATE);
526 if( state != NULL ) {
527 quick_save_state = atoi(state);
528 if( quick_save_state > MAX_QUICK_STATE ) {
529 quick_save_state = 0;
530 }
531 } else {
532 quick_save_state = 0;
533 }
534 }
536 void dreamcast_quick_save()
537 {
538 if( quick_save_state == -1 )
539 dreamcast_quick_state_init();
540 gchar *str = get_quick_state_filename(quick_save_state);
541 dreamcast_save_state(str);
542 g_free(str);
543 }
545 void dreamcast_quick_load()
546 {
547 if( quick_save_state == -1 )
548 dreamcast_quick_state_init();
549 gchar *str = get_quick_state_filename(quick_save_state);
550 dreamcast_load_state(str);
551 g_free(str);
552 }
554 unsigned int dreamcast_get_quick_state( )
555 {
556 if( quick_save_state == -1 )
557 dreamcast_quick_state_init();
558 return quick_save_state;
559 }
561 void dreamcast_set_quick_state( unsigned int state )
562 {
563 if( state <= MAX_QUICK_STATE && state != quick_save_state ) {
564 quick_save_state = state;
565 char buf[3];
566 sprintf( buf, "%d", quick_save_state );
567 lxdream_set_global_config_value(CONFIG_QUICK_STATE, buf);
568 lxdream_save_config();
569 }
570 }
572 gboolean dreamcast_has_quick_state( unsigned int state )
573 {
574 gchar *str = get_quick_state_filename(state);
575 int result = access(str, R_OK);
576 g_free(str);
577 return result == 0 ? TRUE : FALSE;
578 }
580 /********************* The Boot ROM address space **********************/
581 static int32_t FASTCALL ext_bootrom_read_long( sh4addr_t addr )
582 {
583 return *((int32_t *)(dc_boot_rom + (addr&0x001FFFFF)));
584 }
585 static int32_t FASTCALL ext_bootrom_read_word( sh4addr_t addr )
586 {
587 return SIGNEXT16(*((int16_t *)(dc_boot_rom + (addr&0x001FFFFF))));
588 }
589 static int32_t FASTCALL ext_bootrom_read_byte( sh4addr_t addr )
590 {
591 return SIGNEXT8(*((int16_t *)(dc_boot_rom + (addr&0x001FFFFF))));
592 }
593 static void FASTCALL ext_bootrom_read_burst( unsigned char *dest, sh4addr_t addr )
594 {
595 memcpy( dest, dc_boot_rom +(addr&0x001FFFFF), 32 );
596 }
598 struct mem_region_fn mem_region_bootrom = {
599 ext_bootrom_read_long, unmapped_write_long,
600 ext_bootrom_read_word, unmapped_write_long,
601 ext_bootrom_read_byte, unmapped_write_long,
602 ext_bootrom_read_burst, unmapped_write_burst };
604 /********************* The Flash RAM address space **********************/
605 static int32_t FASTCALL ext_flashram_read_long( sh4addr_t addr )
606 {
607 return *((int32_t *)(dc_flash_ram + (addr&0x0001FFFF)));
608 }
609 static int32_t FASTCALL ext_flashram_read_word( sh4addr_t addr )
610 {
611 return SIGNEXT16(*((int16_t *)(dc_flash_ram + (addr&0x0001FFFF))));
612 }
613 static int32_t FASTCALL ext_flashram_read_byte( sh4addr_t addr )
614 {
615 return SIGNEXT8(*((int16_t *)(dc_flash_ram + (addr&0x0001FFFF))));
616 }
617 static void FASTCALL ext_flashram_write_long( sh4addr_t addr, uint32_t val )
618 {
619 *(uint32_t *)(dc_flash_ram + (addr&0x0001FFFF)) = val;
620 asic_g2_write_word();
621 }
622 static void FASTCALL ext_flashram_write_word( sh4addr_t addr, uint32_t val )
623 {
624 *(uint16_t *)(dc_flash_ram + (addr&0x0001FFFF)) = (uint16_t)val;
625 asic_g2_write_word();
626 }
627 static void FASTCALL ext_flashram_write_byte( sh4addr_t addr, uint32_t val )
628 {
629 *(uint8_t *)(dc_flash_ram + (addr&0x0001FFFF)) = (uint8_t)val;
630 asic_g2_write_word();
631 }
632 static void FASTCALL ext_flashram_read_burst( unsigned char *dest, sh4addr_t addr )
633 {
634 memcpy( dest, dc_flash_ram+(addr&0x0001FFFF), 32 );
635 }
636 static void FASTCALL ext_flashram_write_burst( sh4addr_t addr, unsigned char *src )
637 {
638 memcpy( dc_flash_ram+(addr&0x0001FFFF), src, 32 );
639 }
641 struct mem_region_fn mem_region_flashram = { ext_flashram_read_long, ext_flashram_write_long,
642 ext_flashram_read_word, ext_flashram_write_word,
643 ext_flashram_read_byte, ext_flashram_write_byte,
644 ext_flashram_read_burst, ext_flashram_write_burst };
.