filename | src/mem.c |
changeset | 931:430048ea8b71 |
prev | 930:07e5b11419db |
next | 932:2602c5603ce2 |
author | nkeynes |
date | Tue Dec 23 05:48:05 2008 +0000 (15 years ago) |
branch | lxdream-mem |
permissions | -rw-r--r-- |
last change | More refactoring and general cleanup. Most things should be working again now. Split off cache and start real implementation, breaking save states in the process |
view | annotate | diff | log | raw |
1 /**
2 * $Id$
3 * mem.c is responsible for creating and maintaining the overall system memory
4 * map, as visible from the SH4 processor.
5 *
6 * Copyright (c) 2005 Nathan Keynes.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 */
18 #define MODULE mem_module
20 #include <sys/types.h>
21 #include <sys/mman.h>
22 #include <sys/stat.h>
23 #include <glib/gstrfuncs.h>
24 #include <assert.h>
25 #include <stdint.h>
26 #include <stdlib.h>
27 #include <stdio.h>
28 #include <unistd.h>
29 #include <fcntl.h>
30 #include <errno.h>
31 #include <string.h>
32 #include <zlib.h>
33 #include "dream.h"
34 #include "mem.h"
35 #include "mmio.h"
36 #include "dreamcast.h"
38 sh4ptr_t *page_map = NULL;
39 mem_region_fn_t *ext_address_space = NULL;
41 extern struct mem_region_fn mem_region_unmapped;
43 int mem_load(FILE *f);
44 void mem_save(FILE *f);
45 struct dreamcast_module mem_module =
46 { "MEM", mem_init, mem_reset, NULL, NULL, NULL, mem_save, mem_load };
48 struct mem_region mem_rgn[MAX_MEM_REGIONS];
49 struct mmio_region *io_rgn[MAX_IO_REGIONS];
50 struct mmio_region *P4_io[4096];
52 uint32_t num_io_rgns = 0, num_mem_rgns = 0;
54 DEFINE_HOOK( mem_page_remapped_hook, mem_page_remapped_hook_t );
55 static void mem_page_remapped( sh4addr_t addr, mem_region_fn_t fn )
56 {
57 CALL_HOOKS( mem_page_remapped_hook, addr, fn );
58 }
60 /********************* The "unmapped" address space ********************/
61 /* Always reads as 0, writes have no effect */
62 int32_t FASTCALL unmapped_read_long( sh4addr_t addr )
63 {
64 return 0;
65 }
66 void FASTCALL unmapped_write_long( sh4addr_t addr, uint32_t val )
67 {
68 }
69 void FASTCALL unmapped_read_burst( unsigned char *dest, sh4addr_t addr )
70 {
71 memset( dest, 0, 32 );
72 }
73 void FASTCALL unmapped_write_burst( sh4addr_t addr, unsigned char *src )
74 {
75 }
77 struct mem_region_fn mem_region_unmapped = {
78 unmapped_read_long, unmapped_write_long,
79 unmapped_read_long, unmapped_write_long,
80 unmapped_read_long, unmapped_write_long,
81 unmapped_read_burst, unmapped_write_burst };
83 void *mem_alloc_pages( int n )
84 {
85 void *mem = mmap( NULL, n * 4096,
86 PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0 );
87 if( mem == MAP_FAILED ) {
88 ERROR( "Memory allocation failure! (%s)", strerror(errno) );
89 return NULL;
90 }
91 return mem;
92 }
95 void mem_init( void )
96 {
97 int i;
98 mem_region_fn_t *ptr;
99 page_map = mmap( NULL, sizeof(sh4ptr_t) * LXDREAM_PAGE_TABLE_ENTRIES,
100 PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0 );
101 if( page_map == MAP_FAILED ) {
102 FATAL( "Unable to allocate page map! (%s)", strerror(errno) );
103 }
104 memset( page_map, 0, sizeof(sh4ptr_t) * LXDREAM_PAGE_TABLE_ENTRIES );
106 ext_address_space = mmap( NULL, sizeof(mem_region_fn_t) * LXDREAM_PAGE_TABLE_ENTRIES,
107 PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0 );
108 if( ext_address_space == MAP_FAILED ) {
109 FATAL( "Unable to allocate external memory map (%s)", strerror(errno) );
110 }
112 for( ptr = ext_address_space, i = LXDREAM_PAGE_TABLE_ENTRIES; i > 0; ptr++, i-- ) {
113 *ptr = &mem_region_unmapped;
114 }
115 }
117 void mem_reset( void )
118 {
119 /* Restore all mmio registers to their initial settings */
120 int i, j;
121 for( i=1; i<num_io_rgns; i++ ) {
122 for( j=0; io_rgn[i]->ports[j].id != NULL; j++ ) {
123 if( io_rgn[i]->ports[j].def_val != UNDEFINED &&
124 io_rgn[i]->ports[j].def_val != *io_rgn[i]->ports[j].val ) {
125 io_rgn[i]->fn.write_long( io_rgn[i]->ports[j].offset,
126 io_rgn[i]->ports[j].def_val );
127 }
128 }
129 }
130 }
132 void mem_save( FILE *f )
133 {
134 int i;
135 uint32_t len;
137 /* All memory regions */
138 fwrite( &num_mem_rgns, sizeof(num_mem_rgns), 1, f );
139 for( i=0; i<num_mem_rgns; i++ ) {
140 fwrite_string( mem_rgn[i].name, f );
141 fwrite( &mem_rgn[i].base, sizeof(uint32_t), 1, f );
142 fwrite( &mem_rgn[i].flags, sizeof(uint32_t), 1, f );
143 fwrite( &mem_rgn[i].size, sizeof(uint32_t), 1, f );
144 if( mem_rgn[i].flags != MEM_FLAG_ROM )
145 fwrite_gzip( mem_rgn[i].mem, mem_rgn[i].size, 1, f );
146 }
148 /* All MMIO regions */
149 fwrite( &num_io_rgns, sizeof(num_io_rgns), 1, f );
150 for( i=0; i<num_io_rgns; i++ ) {
151 fwrite_string( io_rgn[i]->id, f );
152 fwrite( &io_rgn[i]->base, sizeof( uint32_t ), 1, f );
153 len = 4096;
154 fwrite( &len, sizeof(len), 1, f );
155 fwrite_gzip( io_rgn[i]->mem, len, 1, f );
156 }
157 }
159 int mem_load( FILE *f )
160 {
161 char tmp[64];
162 uint32_t len;
163 uint32_t base, size;
164 uint32_t flags;
165 int i;
167 /* All memory regions */
168 fread( &len, sizeof(len), 1, f );
169 if( len != num_mem_rgns )
170 return -1;
171 for( i=0; i<len; i++ ) {
172 fread_string( tmp, sizeof(tmp), f );
173 fread( &base, sizeof(base), 1, f );
174 fread( &flags, sizeof(flags), 1, f );
175 fread( &size, sizeof(size), 1, f );
176 if( strcmp( mem_rgn[i].name, tmp ) != 0 ||
177 base != mem_rgn[i].base ||
178 flags != mem_rgn[i].flags ||
179 size != mem_rgn[i].size ) {
180 ERROR( "Bad memory region %d %s", i, tmp );
181 return -1;
182 }
183 if( flags != MEM_FLAG_ROM )
184 fread_gzip( mem_rgn[i].mem, size, 1, f );
185 }
187 /* All MMIO regions */
188 fread( &len, sizeof(len), 1, f );
189 if( len != num_io_rgns )
190 return -1;
191 for( i=0; i<len; i++ ) {
192 fread_string( tmp, sizeof(tmp), f );
193 fread( &base, sizeof(base), 1, f );
194 fread( &size, sizeof(size), 1, f );
195 if( strcmp( io_rgn[i]->id, tmp ) != 0 ||
196 base != io_rgn[i]->base ||
197 size != 4096 ) {
198 ERROR( "Bad MMIO region %d %s", i, tmp );
199 return -1;
200 }
201 fread_gzip( io_rgn[i]->mem, size, 1, f );
202 }
203 return 0;
204 }
206 int mem_save_block( const gchar *file, uint32_t start, uint32_t length )
207 {
208 sh4ptr_t region;
209 int len = 4096, total = 0;
210 uint32_t addr = start;
211 FILE *f = fopen(file,"w");
213 if( f == NULL )
214 return errno;
216 while( total < length ) {
217 region = mem_get_region(addr);
218 len = 4096 - (addr & 0x0FFF);
219 if( len > (length-total) )
220 len = (length-total);
221 if( fwrite( region, len, 1, f ) != 1 ) {
222 ERROR( "Unexpected error writing blocks: %d (%s)", len, strerror(errno) );
223 break;
224 }
226 addr += len;
227 total += len;
228 }
229 fclose( f );
230 INFO( "Saved %d of %d bytes to %08X", total, length, start );
231 return 0;
232 }
234 int mem_load_block( const gchar *file, uint32_t start, uint32_t length )
235 {
236 sh4ptr_t region;
237 int len = 4096, total = 0;
238 uint32_t addr = start;
239 struct stat st;
240 FILE *f = fopen(file,"r");
242 if( f == NULL ) {
243 WARN( "Unable to load file '%s': %s", file, strerror(errno) );
244 return -1;
245 }
246 fstat( fileno(f), &st );
247 if( length == 0 || length == -1 || length > st.st_size )
248 length = st.st_size;
250 while( total < length ) {
251 region = mem_get_region(addr);
252 len = 4096 - (addr & 0x0FFF);
253 if( len > (length-total) )
254 len = (length-total);
255 if( fread( region, len, 1, f ) != 1 ) {
256 ERROR( "Unexpected error reading: %d (%s)", len, strerror(errno) );
257 break;
258 }
260 addr += len;
261 total += len;
262 }
263 fclose( f );
264 INFO( "Loaded %d of %d bytes to %08X", total, length, start );
265 return 0;
266 }
268 struct mem_region *mem_map_region( void *mem, uint32_t base, uint32_t size,
269 const char *name, mem_region_fn_t fn, int flags, uint32_t repeat_offset,
270 uint32_t repeat_until )
271 {
272 int i;
273 mem_rgn[num_mem_rgns].base = base;
274 mem_rgn[num_mem_rgns].size = size;
275 mem_rgn[num_mem_rgns].flags = flags;
276 mem_rgn[num_mem_rgns].name = name;
277 mem_rgn[num_mem_rgns].mem = mem;
278 mem_rgn[num_mem_rgns].fn = fn;
279 num_mem_rgns++;
281 do {
282 for( i=0; i<size>>LXDREAM_PAGE_BITS; i++ ) {
283 page_map[(base>>LXDREAM_PAGE_BITS)+i] = mem + (i<<LXDREAM_PAGE_BITS);
284 ext_address_space[(base>>LXDREAM_PAGE_BITS)+i] = fn;
285 mem_page_remapped( base + (i<<LXDREAM_PAGE_BITS), fn );
286 }
287 base += repeat_offset;
288 } while( base <= repeat_until );
290 return &mem_rgn[num_mem_rgns-1];
291 }
293 void register_misc_region( uint32_t base, uint32_t size, const char *name, mem_region_fn_t fn )
294 {
295 mem_rgn[num_mem_rgns].base = base;
296 mem_rgn[num_mem_rgns].size = size;
297 mem_rgn[num_mem_rgns].flags = 0;
298 mem_rgn[num_mem_rgns].name = name;
299 mem_rgn[num_mem_rgns].mem = NULL;
300 mem_rgn[num_mem_rgns].fn = fn;
301 num_mem_rgns++;
303 int count = size >> 12;
304 mem_region_fn_t *ptr = &ext_address_space[base>>12];
305 while( count-- > 0 ) {
306 *ptr++ = fn;
307 }
308 }
310 void *mem_create_ram_region( uint32_t base, uint32_t size, const char *name, mem_region_fn_t fn )
311 {
312 return mem_create_repeating_ram_region( base, size, name, fn, size, base );
313 }
315 void *mem_create_repeating_ram_region( uint32_t base, uint32_t size, const char *name,
316 mem_region_fn_t fn,
317 uint32_t repeat_offset, uint32_t repeat_until )
318 {
319 char *mem;
321 assert( (base&0xFFFFF000) == base ); /* must be page aligned */
322 assert( (size&0x00000FFF) == 0 );
323 assert( num_mem_rgns < MAX_MEM_REGIONS );
324 assert( page_map != NULL );
326 mem = mem_alloc_pages( size>>LXDREAM_PAGE_BITS );
328 mem_map_region( mem, base, size, name, fn, MEM_FLAG_RAM, repeat_offset, repeat_until );
330 return mem;
331 }
333 gboolean mem_load_rom( const gchar *file, uint32_t base, uint32_t size, uint32_t crc,
334 const gchar *region_name, mem_region_fn_t fn )
335 {
336 sh4ptr_t mem;
337 uint32_t calc_crc;
338 int status;
340 mem = mem_get_region(base);
341 if( mem == NULL ) {
342 mem = mmap( NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_PRIVATE, -1, 0 );
343 if( mem == MAP_FAILED ) {
344 ERROR( "Unable to allocate ROM memory: %s (%s)", file, strerror(errno) );
345 return FALSE;
346 }
347 mem_map_region( mem, base, size, region_name, fn, MEM_FLAG_ROM, size, base );
348 } else {
349 mprotect( mem, size, PROT_READ|PROT_WRITE );
350 }
352 if( file != NULL && file[0] != '\0' ) {
353 status = mem_load_block( file, base, size );
354 mprotect( mem, size, PROT_READ );
356 if( status == 0 ) {
357 /* CRC check only if we loaded something */
358 calc_crc = crc32(0L, (sh4ptr_t)mem, size);
359 if( calc_crc != crc ) {
360 WARN( "Bios CRC Mismatch in %s: %08X (expected %08X)",
361 file, calc_crc, crc);
362 }
363 return TRUE;
364 }
365 }
366 return FALSE;
367 }
369 sh4ptr_t mem_get_region_by_name( const char *name )
370 {
371 int i;
372 for( i=0; i<num_mem_rgns; i++ ) {
373 if( strcmp( mem_rgn[i].name, name ) == 0 )
374 return mem_rgn[i].mem;
375 }
376 return NULL;
377 }
379 void register_io_region( struct mmio_region *io )
380 {
381 int i;
383 assert(io);
384 io->mem = mem_alloc_pages(2);
385 io->save_mem = io->mem + LXDREAM_PAGE_SIZE;
386 io->index = (struct mmio_port **)malloc(1024*sizeof(struct mmio_port *));
387 io->trace_flag = 0;
388 memset( io->index, 0, 1024*sizeof(struct mmio_port *) );
389 for( i=0; io->ports[i].id != NULL; i++ ) {
390 io->ports[i].val = (uint32_t *)(io->mem + io->ports[i].offset);
391 *io->ports[i].val = io->ports[i].def_val;
392 io->index[io->ports[i].offset>>2] = &io->ports[i];
393 }
394 memcpy( io->save_mem, io->mem, LXDREAM_PAGE_SIZE );
395 if( (io->base & 0xFF000000) == 0xFF000000 ) {
396 /* P4 area (on-chip I/O channels */
397 P4_io[(io->base&0x1FFFFFFF)>>19] = io;
398 } else {
399 page_map[io->base>>12] = (sh4ptr_t)(uintptr_t)num_io_rgns;
400 ext_address_space[io->base>>12] = &io->fn;
401 mem_page_remapped( io->base, &io->fn );
402 }
403 io_rgn[num_io_rgns] = io;
404 num_io_rgns++;
405 }
407 void register_io_regions( struct mmio_region **io )
408 {
409 while( *io ) register_io_region( *io++ );
410 }
412 int mem_has_page( uint32_t addr )
413 {
414 sh4ptr_t page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];
415 return page != NULL;
416 }
418 sh4ptr_t mem_get_page( uint32_t addr )
419 {
420 sh4ptr_t page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];
421 return page;
422 }
424 sh4ptr_t mem_get_region( uint32_t addr )
425 {
426 sh4ptr_t page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];
427 if( ((uintptr_t)page) < MAX_IO_REGIONS ) { /* IO Region */
428 return NULL;
429 } else {
430 return page+(addr&0xFFF);
431 }
432 }
434 void mem_write_long( sh4addr_t addr, uint32_t value )
435 {
436 sh4ptr_t ptr = mem_get_region(addr);
437 assert(ptr != NULL);
438 *((uint32_t *)ptr) = value;
439 }
441 struct mmio_region *mem_get_io_region( uint32_t addr )
442 {
443 if( addr > 0xFF000000 ) {
444 return P4_io[(addr&0x00FFFFFF)>>12];
445 }
446 sh4ptr_t page = page_map[(addr&0x1FFFFFFF)>>12];
447 if( ((uintptr_t)page) < MAX_IO_REGIONS ) {
448 return io_rgn[(uintptr_t)page];
449 } else {
450 return NULL;
451 }
452 }
454 struct mmio_region *mem_get_io_region_by_name( const gchar *name )
455 {
456 int i;
457 for( i=0; i<num_io_rgns; i++ ) {
458 if( strcasecmp(io_rgn[i]->id, name) == 0 ) {
459 return io_rgn[i];
460 }
461 }
462 return NULL;
463 }
465 void mem_set_trace( const gchar *tracelist, gboolean flag )
466 {
467 if( tracelist != NULL ) {
468 gchar ** tracev = g_strsplit_set( tracelist, ",:; \t\r\n", 0 );
469 int i;
470 for( i=0; tracev[i] != NULL; i++ ) {
471 // Special case "all" - trace everything
472 if( strcasecmp(tracev[i], "all") == 0 ) {
473 int j;
474 for( j=0; j<num_io_rgns; j++ ) {
475 io_rgn[j]->trace_flag = flag ? 1 : 0;
476 }
477 break;
478 }
479 struct mmio_region *region = mem_get_io_region_by_name( tracev[i] );
480 if( region == NULL ) {
481 WARN( "Unknown IO region '%s'", tracev[i] );
482 } else {
483 region->trace_flag = flag ? 1 : 0;
484 }
485 }
486 g_strfreev( tracev );
487 }
488 }
.