lxdream 0.9.1| filename | src/mem.c |
| changeset | 934:3acd3b3ee6d1 |
| prev | 932:2602c5603ce2 |
| next | 939:6f2302afeb89 |
| author | nkeynes |
| date | Fri Dec 26 14:25:23 2008 +0000 (14 years ago) |
| branch | lxdream-mem |
| permissions | -rw-r--r-- |
| last change | Change RAM regions to use static arrays rather than mmap regions, for a 2-3% performance gain. General mem cleanups, including some save state fixes that break states again. |
| 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, num_ram_regions = 0;
135 uint32_t len;
137 /* All RAM regions (ROM and non-memory regions don't need to be saved)
138 * Flash is questionable - for now we save it too */
139 for( i=0; i<num_mem_rgns; i++ ) {
140 if( mem_rgn[i].flags == MEM_FLAG_RAM ) {
141 num_ram_regions++;
142 }
143 }
144 fwrite( &num_ram_regions, sizeof(num_ram_regions), 1, f );
146 for( i=0; i<num_mem_rgns; i++ ) {
147 if( mem_rgn[i].flags == MEM_FLAG_RAM ) {
148 fwrite_string( mem_rgn[i].name, f );
149 fwrite( &mem_rgn[i].base, sizeof(uint32_t), 1, f );
150 fwrite( &mem_rgn[i].flags, sizeof(uint32_t), 1, f );
151 fwrite( &mem_rgn[i].size, sizeof(uint32_t), 1, f );
152 fwrite_gzip( mem_rgn[i].mem, mem_rgn[i].size, 1, f );
153 }
154 }
156 /* All MMIO regions */
157 fwrite( &num_io_rgns, sizeof(num_io_rgns), 1, f );
158 for( i=0; i<num_io_rgns; i++ ) {
159 fwrite_string( io_rgn[i]->id, f );
160 fwrite( &io_rgn[i]->base, sizeof( uint32_t ), 1, f );
161 len = 4096;
162 fwrite( &len, sizeof(len), 1, f );
163 fwrite_gzip( io_rgn[i]->mem, len, 1, f );
164 }
165 }
167 int mem_load( FILE *f )
168 {
169 char tmp[64];
170 uint32_t len;
171 uint32_t base, size;
172 uint32_t flags;
173 int i, j;
174 int mem_region_loaded[MAX_MEM_REGIONS];
176 /* All RAM regions */
177 memset( mem_region_loaded, 0, sizeof(mem_region_loaded) );
178 fread( &len, sizeof(len), 1, f );
179 for( i=0; i<len; i++ ) {
180 fread_string( tmp, sizeof(tmp), f );
182 for( j=0; j<num_mem_rgns; j++ ) {
183 if( strcasecmp( mem_rgn[j].name, tmp ) == 0 ) {
184 fread( &base, sizeof(base), 1, f );
185 fread( &flags, sizeof(flags), 1, f );
186 fread( &size, sizeof(size), 1, f );
187 if( base != mem_rgn[j].base ||
188 flags != mem_rgn[j].flags ||
189 size != mem_rgn[j].size ) {
190 ERROR( "Bad memory block %d %s (not mapped to expected region)", i, tmp );
191 return -1;
192 }
193 if( flags != MEM_FLAG_RAM ) {
194 ERROR( "Unexpected memory block %d %s (Not a RAM region)", i, tmp );
195 return -1;
196 }
197 fread_gzip( mem_rgn[j].mem, size, 1, f );
198 mem_region_loaded[j] = 1;
199 }
200 }
201 }
202 /* Make sure we got all the memory regions we expected */
203 for( i=0; i<num_mem_rgns; i++ ) {
204 if( mem_rgn[i].flags == MEM_FLAG_RAM &&
205 mem_region_loaded[i] == 0 ) {
206 ERROR( "Missing memory block %s (not found in save state)", mem_rgn[i].name );
207 return -1;
208 }
209 }
211 /* All MMIO regions */
212 fread( &len, sizeof(len), 1, f );
213 if( len != num_io_rgns ) {
214 ERROR( "Unexpected IO region count %d (expected %d)", len, num_io_rgns );
215 return -1;
216 }
218 for( i=0; i<len; i++ ) {
219 fread_string( tmp, sizeof(tmp), f );
220 fread( &base, sizeof(base), 1, f );
221 fread( &size, sizeof(size), 1, f );
222 if( strcmp( io_rgn[i]->id, tmp ) != 0 ||
223 base != io_rgn[i]->base ||
224 size != 4096 ) {
225 ERROR( "Bad MMIO region %d %s", i, tmp );
226 return -1;
227 }
228 fread_gzip( io_rgn[i]->mem, size, 1, f );
229 }
230 return 0;
231 }
233 int mem_save_block( const gchar *file, uint32_t start, uint32_t length )
234 {
235 sh4ptr_t region;
236 int len = 4096, total = 0;
237 uint32_t addr = start;
238 FILE *f = fopen(file,"w");
240 if( f == NULL )
241 return errno;
243 while( total < length ) {
244 region = mem_get_region(addr);
245 len = 4096 - (addr & 0x0FFF);
246 if( len > (length-total) )
247 len = (length-total);
248 if( fwrite( region, len, 1, f ) != 1 ) {
249 ERROR( "Unexpected error writing blocks: %d (%s)", len, strerror(errno) );
250 break;
251 }
253 addr += len;
254 total += len;
255 }
256 fclose( f );
257 INFO( "Saved %d of %d bytes to %08X", total, length, start );
258 return 0;
259 }
261 int mem_load_block( const gchar *file, uint32_t start, uint32_t length )
262 {
263 sh4ptr_t region;
264 int len = 4096, total = 0;
265 uint32_t addr = start;
266 struct stat st;
267 FILE *f = fopen(file,"r");
269 if( f == NULL ) {
270 WARN( "Unable to load file '%s': %s", file, strerror(errno) );
271 return -1;
272 }
273 fstat( fileno(f), &st );
274 if( length == 0 || length == -1 || length > st.st_size )
275 length = st.st_size;
277 while( total < length ) {
278 region = mem_get_region(addr);
279 len = 4096 - (addr & 0x0FFF);
280 if( len > (length-total) )
281 len = (length-total);
282 if( fread( region, len, 1, f ) != 1 ) {
283 ERROR( "Unexpected error reading: %d (%s)", len, strerror(errno) );
284 break;
285 }
287 addr += len;
288 total += len;
289 }
290 fclose( f );
291 INFO( "Loaded %d of %d bytes to %08X", total, length, start );
292 return 0;
293 }
295 struct mem_region *mem_map_region( void *mem, uint32_t base, uint32_t size,
296 const char *name, mem_region_fn_t fn, int flags,
297 uint32_t repeat_offset, uint32_t repeat_until )
298 {
299 int i;
300 mem_rgn[num_mem_rgns].base = base;
301 mem_rgn[num_mem_rgns].size = size;
302 mem_rgn[num_mem_rgns].flags = flags;
303 mem_rgn[num_mem_rgns].name = name;
304 mem_rgn[num_mem_rgns].mem = mem;
305 mem_rgn[num_mem_rgns].fn = fn;
306 num_mem_rgns++;
308 do {
309 for( i=0; i<size>>LXDREAM_PAGE_BITS; i++ ) {
310 if( mem != NULL ) {
311 page_map[(base>>LXDREAM_PAGE_BITS)+i] = mem + (i<<LXDREAM_PAGE_BITS);
312 }
313 ext_address_space[(base>>LXDREAM_PAGE_BITS)+i] = fn;
314 mem_page_remapped( base + (i<<LXDREAM_PAGE_BITS), fn );
315 }
316 base += repeat_offset;
317 } while( base <= repeat_until );
319 return &mem_rgn[num_mem_rgns-1];
320 }
322 gboolean mem_load_rom( void *output, const gchar *file, uint32_t size, uint32_t crc )
323 {
324 if( file != NULL && file[0] != '\0' ) {
325 FILE *f = fopen(file,"r");
326 struct stat st;
327 uint32_t calc_crc;
329 if( f == NULL ) {
330 ERROR( "Unable to load file '%s': %s", file, strerror(errno) );
331 return FALSE;
332 }
334 fstat( fileno(f), &st );
335 if( st.st_size != size ) {
336 ERROR( "File '%s' is invalid, expected %d bytes but was %d bytes long.", file, size, st.st_size );
337 fclose(f);
338 return FALSE;
339 }
341 if( fread( output, 1, size, f ) != size ) {
342 ERROR( "Failed to load file '%s': %s", file, strerror(errno) );
343 fclose(f);
344 return FALSE;
345 }
347 /* CRC check only if we loaded something */
348 calc_crc = crc32(0L, output, size);
349 if( calc_crc != crc ) {
350 WARN( "Bios CRC Mismatch in %s: %08X (expected %08X)",
351 file, calc_crc, crc);
352 }
353 /* Even if the CRC fails, continue normally */
354 return TRUE;
355 }
356 return FALSE;
357 }
359 sh4ptr_t mem_get_region_by_name( const char *name )
360 {
361 int i;
362 for( i=0; i<num_mem_rgns; i++ ) {
363 if( strcmp( mem_rgn[i].name, name ) == 0 )
364 return mem_rgn[i].mem;
365 }
366 return NULL;
367 }
369 void register_io_region( struct mmio_region *io )
370 {
371 int i;
373 assert(io);
374 io->mem = mem_alloc_pages(2);
375 io->save_mem = io->mem + LXDREAM_PAGE_SIZE;
376 io->index = (struct mmio_port **)malloc(1024*sizeof(struct mmio_port *));
377 io->trace_flag = 0;
378 memset( io->index, 0, 1024*sizeof(struct mmio_port *) );
379 for( i=0; io->ports[i].id != NULL; i++ ) {
380 io->ports[i].val = (uint32_t *)(io->mem + io->ports[i].offset);
381 *io->ports[i].val = io->ports[i].def_val;
382 io->index[io->ports[i].offset>>2] = &io->ports[i];
383 }
384 memcpy( io->save_mem, io->mem, LXDREAM_PAGE_SIZE );
385 if( (io->base & 0xFF000000) == 0xFF000000 ) {
386 /* P4 area (on-chip I/O channels */
387 P4_io[(io->base&0x1FFFFFFF)>>19] = io;
388 } else {
389 page_map[io->base>>12] = (sh4ptr_t)(uintptr_t)num_io_rgns;
390 ext_address_space[io->base>>12] = &io->fn;
391 mem_page_remapped( io->base, &io->fn );
392 }
393 io_rgn[num_io_rgns] = io;
394 num_io_rgns++;
395 }
397 void register_io_regions( struct mmio_region **io )
398 {
399 while( *io ) register_io_region( *io++ );
400 }
402 gboolean mem_has_page( uint32_t addr )
403 {
404 return ext_address_space[ (addr&0x1FFFFFFF)>>12 ] != &mem_region_unmapped;
405 }
407 sh4ptr_t mem_get_region( uint32_t addr )
408 {
409 sh4ptr_t page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];
410 if( ((uintptr_t)page) < MAX_IO_REGIONS ) { /* IO Region */
411 return NULL;
412 } else {
413 return page+(addr&0xFFF);
414 }
415 }
417 void mem_write_long( sh4addr_t addr, uint32_t value )
418 {
419 ext_address_space[(addr&0x1FFFFFFF)>>12]->write_long(addr, value);
420 }
422 struct mmio_region *mem_get_io_region_by_name( const gchar *name )
423 {
424 int i;
425 for( i=0; i<num_io_rgns; i++ ) {
426 if( strcasecmp(io_rgn[i]->id, name) == 0 ) {
427 return io_rgn[i];
428 }
429 }
430 return NULL;
431 }
433 void mem_set_trace( const gchar *tracelist, gboolean flag )
434 {
435 if( tracelist != NULL ) {
436 gchar ** tracev = g_strsplit_set( tracelist, ",:; \t\r\n", 0 );
437 int i;
438 for( i=0; tracev[i] != NULL; i++ ) {
439 // Special case "all" - trace everything
440 if( strcasecmp(tracev[i], "all") == 0 ) {
441 int j;
442 for( j=0; j<num_io_rgns; j++ ) {
443 io_rgn[j]->trace_flag = flag ? 1 : 0;
444 }
445 break;
446 }
447 struct mmio_region *region = mem_get_io_region_by_name( tracev[i] );
448 if( region == NULL ) {
449 WARN( "Unknown IO region '%s'", tracev[i] );
450 } else {
451 region->trace_flag = flag ? 1 : 0;
452 }
453 }
454 g_strfreev( tracev );
455 }
456 }
.