lxdream 0.9.1| filename | src/mem.c |
| changeset | 986:5090104b0963 |
| prev | 975:007bf7eb944f |
| next | 1065:bc1cc0c54917 |
| author | nkeynes |
| date | Sun Apr 12 07:24:45 2009 +0000 (15 years ago) |
| branch | xlat-refactor |
| permissions | -rw-r--r-- |
| last change | Restructure operand types - rename to forms to avoid conflict for actual data types temporary operands are now a first class form remove explicit types for immediates - now implied by opcode Initial work on promote-source-reg pass |
| 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 #ifndef PAGE_SIZE
39 #define PAGE_SIZE 4096
40 #endif
42 sh4ptr_t *page_map = NULL;
43 mem_region_fn_t *ext_address_space = NULL;
45 extern struct mem_region_fn mem_region_unmapped;
47 static int mem_load(FILE *f);
48 static void mem_save(FILE *f);
49 struct dreamcast_module mem_module =
50 { "MEM", mem_init, mem_reset, NULL, NULL, NULL, mem_save, mem_load };
52 struct mem_region mem_rgn[MAX_MEM_REGIONS];
53 struct mmio_region *io_rgn[MAX_IO_REGIONS];
54 struct mmio_region *P4_io[4096];
56 uint32_t num_io_rgns = 0, num_mem_rgns = 0;
58 DEFINE_HOOK( mem_page_remapped_hook, mem_page_remapped_hook_t );
59 static void mem_page_remapped( sh4addr_t addr, mem_region_fn_t fn )
60 {
61 CALL_HOOKS( mem_page_remapped_hook, addr, fn );
62 }
64 /********************* The "unmapped" address space ********************/
65 /* Always reads as 0, writes have no effect */
66 int32_t FASTCALL unmapped_read_long( sh4addr_t addr )
67 {
68 return 0;
69 }
70 void FASTCALL unmapped_write_long( sh4addr_t addr, uint32_t val )
71 {
72 }
73 void FASTCALL unmapped_read_burst( unsigned char *dest, sh4addr_t addr )
74 {
75 memset( dest, 0, 32 );
76 }
77 void FASTCALL unmapped_write_burst( sh4addr_t addr, unsigned char *src )
78 {
79 }
81 void FASTCALL unmapped_prefetch( sh4addr_t addr )
82 {
83 /* No effect */
84 }
86 struct mem_region_fn mem_region_unmapped = {
87 unmapped_read_long, unmapped_write_long,
88 unmapped_read_long, unmapped_write_long,
89 unmapped_read_long, unmapped_write_long,
90 unmapped_read_burst, unmapped_write_burst,
91 unmapped_prefetch, unmapped_read_long };
93 void *mem_alloc_pages( int n )
94 {
95 void *mem = mmap( NULL, n * 4096,
96 PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0 );
97 if( mem == MAP_FAILED ) {
98 ERROR( "Memory allocation failure! (%s)", strerror(errno) );
99 return NULL;
100 }
101 return mem;
102 }
104 void mem_unprotect( void *region, uint32_t size )
105 {
106 /* Force page alignment */
107 uintptr_t i = (uintptr_t)region;
108 uintptr_t mask = ~(PAGE_SIZE-1);
109 void *ptr = (void *)(i & mask);
110 size_t len = (i & (PAGE_SIZE-1)) + size;
111 len = (len + (PAGE_SIZE-1)) & mask;
113 int status = mprotect( ptr, len, PROT_READ|PROT_WRITE|PROT_EXEC );
114 assert( status == 0 );
115 }
117 void mem_init( void )
118 {
119 int i;
120 mem_region_fn_t *ptr;
121 page_map = (sh4ptr_t *)mmap( NULL, sizeof(sh4ptr_t) * LXDREAM_PAGE_TABLE_ENTRIES,
122 PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0 );
123 if( page_map == MAP_FAILED ) {
124 FATAL( "Unable to allocate page map! (%s)", strerror(errno) );
125 }
126 memset( page_map, 0, sizeof(sh4ptr_t) * LXDREAM_PAGE_TABLE_ENTRIES );
128 ext_address_space = (mem_region_fn_t *) mmap( NULL, sizeof(mem_region_fn_t) * LXDREAM_PAGE_TABLE_ENTRIES,
129 PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, 0 );
130 if( ext_address_space == MAP_FAILED ) {
131 FATAL( "Unable to allocate external memory map (%s)", strerror(errno) );
132 }
134 for( ptr = ext_address_space, i = LXDREAM_PAGE_TABLE_ENTRIES; i > 0; ptr++, i-- ) {
135 *ptr = &mem_region_unmapped;
136 }
137 }
139 void mem_reset( void )
140 {
141 /* Restore all mmio registers to their initial settings */
142 int i, j;
143 for( i=1; i<num_io_rgns; i++ ) {
144 for( j=0; io_rgn[i]->ports[j].id != NULL; j++ ) {
145 if( io_rgn[i]->ports[j].def_val != UNDEFINED &&
146 io_rgn[i]->ports[j].def_val != *io_rgn[i]->ports[j].val ) {
147 io_rgn[i]->fn.write_long( io_rgn[i]->ports[j].offset,
148 io_rgn[i]->ports[j].def_val );
149 }
150 }
151 }
152 }
154 static void mem_save( FILE *f )
155 {
156 int i, num_ram_regions = 0;
157 uint32_t len;
159 /* All RAM regions (ROM and non-memory regions don't need to be saved)
160 * Flash is questionable - for now we save it too */
161 for( i=0; i<num_mem_rgns; i++ ) {
162 if( mem_rgn[i].flags == MEM_FLAG_RAM ) {
163 num_ram_regions++;
164 }
165 }
166 fwrite( &num_ram_regions, sizeof(num_ram_regions), 1, f );
168 for( i=0; i<num_mem_rgns; i++ ) {
169 if( mem_rgn[i].flags == MEM_FLAG_RAM ) {
170 fwrite_string( mem_rgn[i].name, f );
171 fwrite( &mem_rgn[i].base, sizeof(uint32_t), 1, f );
172 fwrite( &mem_rgn[i].flags, sizeof(uint32_t), 1, f );
173 fwrite( &mem_rgn[i].size, sizeof(uint32_t), 1, f );
174 fwrite_gzip( mem_rgn[i].mem, mem_rgn[i].size, 1, f );
175 }
176 }
178 /* All MMIO regions */
179 fwrite( &num_io_rgns, sizeof(num_io_rgns), 1, f );
180 for( i=0; i<num_io_rgns; i++ ) {
181 fwrite_string( io_rgn[i]->id, f );
182 fwrite( &io_rgn[i]->base, sizeof( uint32_t ), 1, f );
183 len = 4096;
184 fwrite( &len, sizeof(len), 1, f );
185 fwrite_gzip( io_rgn[i]->mem, len, 1, f );
186 }
187 }
189 static int mem_load( FILE *f )
190 {
191 char tmp[64];
192 uint32_t len;
193 uint32_t base, size;
194 uint32_t flags;
195 int i, j;
196 int mem_region_loaded[MAX_MEM_REGIONS];
198 /* All RAM regions */
199 memset( mem_region_loaded, 0, sizeof(mem_region_loaded) );
200 fread( &len, sizeof(len), 1, f );
201 for( i=0; i<len; i++ ) {
202 fread_string( tmp, sizeof(tmp), f );
204 for( j=0; j<num_mem_rgns; j++ ) {
205 if( strcasecmp( mem_rgn[j].name, tmp ) == 0 ) {
206 fread( &base, sizeof(base), 1, f );
207 fread( &flags, sizeof(flags), 1, f );
208 fread( &size, sizeof(size), 1, f );
209 if( base != mem_rgn[j].base ||
210 flags != mem_rgn[j].flags ||
211 size != mem_rgn[j].size ) {
212 ERROR( "Bad memory block %d %s (not mapped to expected region)", i, tmp );
213 return -1;
214 }
215 if( flags != MEM_FLAG_RAM ) {
216 ERROR( "Unexpected memory block %d %s (Not a RAM region)", i, tmp );
217 return -1;
218 }
219 fread_gzip( mem_rgn[j].mem, size, 1, f );
220 mem_region_loaded[j] = 1;
221 break;
222 }
223 }
224 }
225 /* Make sure we got all the memory regions we expected */
226 for( i=0; i<num_mem_rgns; i++ ) {
227 if( mem_rgn[i].flags == MEM_FLAG_RAM &&
228 mem_region_loaded[i] == 0 ) {
229 ERROR( "Missing memory block %s (not found in save state)", mem_rgn[i].name );
230 return -1;
231 }
232 }
234 /* All MMIO regions */
235 fread( &len, sizeof(len), 1, f );
236 if( len != num_io_rgns ) {
237 ERROR( "Unexpected IO region count %d (expected %d)", len, num_io_rgns );
238 return -1;
239 }
241 for( i=0; i<len; i++ ) {
242 fread_string( tmp, sizeof(tmp), f );
243 fread( &base, sizeof(base), 1, f );
244 fread( &size, sizeof(size), 1, f );
245 if( strcmp( io_rgn[i]->id, tmp ) != 0 ||
246 base != io_rgn[i]->base ||
247 size != 4096 ) {
248 ERROR( "Bad MMIO region %d %s", i, tmp );
249 return -1;
250 }
251 fread_gzip( io_rgn[i]->mem, size, 1, f );
252 }
253 return 0;
254 }
256 int mem_save_block( const gchar *file, uint32_t start, uint32_t length )
257 {
258 sh4ptr_t region;
259 int len = 4096, total = 0;
260 uint32_t addr = start;
261 FILE *f = fopen(file,"w");
263 if( f == NULL )
264 return errno;
266 while( total < length ) {
267 region = mem_get_region(addr);
268 len = 4096 - (addr & 0x0FFF);
269 if( len > (length-total) )
270 len = (length-total);
271 if( fwrite( region, len, 1, f ) != 1 ) {
272 ERROR( "Unexpected error writing blocks: %d (%s)", len, strerror(errno) );
273 break;
274 }
276 addr += len;
277 total += len;
278 }
279 fclose( f );
280 INFO( "Saved %d of %d bytes to %08X", total, length, start );
281 return 0;
282 }
284 int mem_load_block( const gchar *file, uint32_t start, uint32_t length )
285 {
286 sh4ptr_t region;
287 int len = 4096, total = 0;
288 uint32_t addr = start;
289 struct stat st;
290 FILE *f = fopen(file,"r");
292 if( f == NULL ) {
293 WARN( "Unable to load file '%s': %s", file, strerror(errno) );
294 return -1;
295 }
296 fstat( fileno(f), &st );
297 if( length == 0 || length == -1 || length > st.st_size )
298 length = st.st_size;
300 while( total < length ) {
301 region = mem_get_region(addr);
302 len = 4096 - (addr & 0x0FFF);
303 if( len > (length-total) )
304 len = (length-total);
305 if( fread( region, len, 1, f ) != 1 ) {
306 ERROR( "Unexpected error reading: %d (%s)", len, strerror(errno) );
307 break;
308 }
310 addr += len;
311 total += len;
312 }
313 fclose( f );
314 INFO( "Loaded %d of %d bytes to %08X", total, length, start );
315 return 0;
316 }
318 struct mem_region *mem_map_region( void *mem, uint32_t base, uint32_t size,
319 const char *name, mem_region_fn_t fn, int flags,
320 uint32_t repeat_offset, uint32_t repeat_until )
321 {
322 int i;
323 mem_rgn[num_mem_rgns].base = base;
324 mem_rgn[num_mem_rgns].size = size;
325 mem_rgn[num_mem_rgns].flags = flags;
326 mem_rgn[num_mem_rgns].name = name;
327 mem_rgn[num_mem_rgns].mem = mem;
328 mem_rgn[num_mem_rgns].fn = fn;
329 fn->prefetch = unmapped_prefetch;
330 fn->read_byte_for_write = fn->read_byte;
331 num_mem_rgns++;
333 do {
334 for( i=0; i<size>>LXDREAM_PAGE_BITS; i++ ) {
335 if( mem != NULL ) {
336 page_map[(base>>LXDREAM_PAGE_BITS)+i] = ((unsigned char *)mem) + (i<<LXDREAM_PAGE_BITS);
337 }
338 ext_address_space[(base>>LXDREAM_PAGE_BITS)+i] = fn;
339 mem_page_remapped( base + (i<<LXDREAM_PAGE_BITS), fn );
340 }
341 base += repeat_offset;
342 } while( base <= repeat_until );
344 return &mem_rgn[num_mem_rgns-1];
345 }
347 gboolean mem_load_rom( void *output, const gchar *file, uint32_t size, uint32_t crc )
348 {
349 if( file != NULL && file[0] != '\0' ) {
350 FILE *f = fopen(file,"r");
351 struct stat st;
352 uint32_t calc_crc;
354 if( f == NULL ) {
355 ERROR( "Unable to load file '%s': %s", file, strerror(errno) );
356 return FALSE;
357 }
359 fstat( fileno(f), &st );
360 if( st.st_size != size ) {
361 ERROR( "File '%s' is invalid, expected %d bytes but was %d bytes long.", file, size, st.st_size );
362 fclose(f);
363 return FALSE;
364 }
366 if( fread( output, 1, size, f ) != size ) {
367 ERROR( "Failed to load file '%s': %s", file, strerror(errno) );
368 fclose(f);
369 return FALSE;
370 }
372 /* CRC check only if we loaded something */
373 calc_crc = crc32(0L, output, size);
374 if( calc_crc != crc ) {
375 WARN( "Bios CRC Mismatch in %s: %08X (expected %08X)",
376 file, calc_crc, crc);
377 }
378 /* Even if the CRC fails, continue normally */
379 return TRUE;
380 }
381 return FALSE;
382 }
384 sh4ptr_t mem_get_region_by_name( const char *name )
385 {
386 int i;
387 for( i=0; i<num_mem_rgns; i++ ) {
388 if( strcmp( mem_rgn[i].name, name ) == 0 )
389 return mem_rgn[i].mem;
390 }
391 return NULL;
392 }
394 void register_io_region( struct mmio_region *io )
395 {
396 int i;
398 assert(io);
399 io->mem = mem_alloc_pages(2);
400 io->save_mem = io->mem + LXDREAM_PAGE_SIZE;
401 io->index = (struct mmio_port **)malloc(1024*sizeof(struct mmio_port *));
402 io->trace_flag = 0;
403 memset( io->index, 0, 1024*sizeof(struct mmio_port *) );
404 for( i=0; io->ports[i].id != NULL; i++ ) {
405 io->ports[i].val = (uint32_t *)(io->mem + io->ports[i].offset);
406 *io->ports[i].val = io->ports[i].def_val;
407 io->index[io->ports[i].offset>>2] = &io->ports[i];
408 }
409 memcpy( io->save_mem, io->mem, LXDREAM_PAGE_SIZE );
410 if( (io->base & 0xFF000000) == 0xFF000000 ) {
411 /* P4 area (on-chip I/O channels */
412 P4_io[(io->base&0x1FFFFFFF)>>19] = io;
413 } else {
414 page_map[io->base>>12] = (sh4ptr_t)(uintptr_t)num_io_rgns;
415 ext_address_space[io->base>>12] = &io->fn;
416 mem_page_remapped( io->base, &io->fn );
417 }
418 io_rgn[num_io_rgns] = io;
419 num_io_rgns++;
420 }
422 void register_io_regions( struct mmio_region **io )
423 {
424 while( *io ) register_io_region( *io++ );
425 }
427 gboolean mem_has_page( uint32_t addr )
428 {
429 return ext_address_space[ (addr&0x1FFFFFFF)>>12 ] != &mem_region_unmapped;
430 }
432 sh4ptr_t mem_get_region( uint32_t addr )
433 {
434 sh4ptr_t page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];
435 if( ((uintptr_t)page) < MAX_IO_REGIONS ) { /* IO Region */
436 return NULL;
437 } else {
438 return page+(addr&0xFFF);
439 }
440 }
442 void mem_write_long( sh4addr_t addr, uint32_t value )
443 {
444 ext_address_space[(addr&0x1FFFFFFF)>>12]->write_long(addr, value);
445 }
447 static struct mmio_region *mem_get_io_region_by_name( const gchar *name )
448 {
449 int i;
450 for( i=0; i<num_io_rgns; i++ ) {
451 if( strcasecmp(io_rgn[i]->id, name) == 0 ) {
452 return io_rgn[i];
453 }
454 }
455 return NULL;
456 }
458 void mem_set_trace( const gchar *tracelist, gboolean flag )
459 {
460 if( tracelist != NULL ) {
461 gchar ** tracev = g_strsplit_set( tracelist, ",:; \t\r\n", 0 );
462 int i;
463 for( i=0; tracev[i] != NULL; i++ ) {
464 // Special case "all" - trace everything
465 if( strcasecmp(tracev[i], "all") == 0 ) {
466 int j;
467 for( j=0; j<num_io_rgns; j++ ) {
468 io_rgn[j]->trace_flag = flag ? 1 : 0;
469 }
470 break;
471 }
472 struct mmio_region *region = mem_get_io_region_by_name( tracev[i] );
473 if( region == NULL ) {
474 WARN( "Unknown IO region '%s'", tracev[i] );
475 } else {
476 region->trace_flag = flag ? 1 : 0;
477 }
478 }
479 g_strfreev( tracev );
480 }
481 }
.