filename | src/mem.c |
changeset | 477:9a373f2ff009 |
prev | 466:a6935f46ed78 |
next | 480:d28c2992f5ee |
author | nkeynes |
date | Wed Oct 31 09:10:23 2007 +0000 (16 years ago) |
permissions | -rw-r--r-- |
last change | Add save/restore of render buffers in save states Gzip memory blocks in save states Move front-buffer management back to pvr2 Add screenshot preview when loading save states Various minor fixes and cleanups |
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1 /**
2 * $Id: mem.c,v 1.18 2007-10-31 09:10:23 nkeynes Exp $
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/mman.h>
21 #include <sys/stat.h>
22 #include <assert.h>
23 #include <stdint.h>
24 #include <stdlib.h>
25 #include <stdio.h>
26 #include <unistd.h>
27 #include <fcntl.h>
28 #include <errno.h>
29 #include <string.h>
30 #include <zlib.h>
31 #include "dream.h"
32 #include "mem.h"
33 #include "mmio.h"
34 #include "dreamcast.h"
36 char **page_map = NULL;
38 int mem_load(FILE *f);
39 void mem_save(FILE *f);
40 struct dreamcast_module mem_module =
41 { "MEM", mem_init, mem_reset, NULL, NULL, NULL, mem_save, mem_load };
43 struct mem_region mem_rgn[MAX_MEM_REGIONS];
44 struct mmio_region *io_rgn[MAX_IO_REGIONS];
45 struct mmio_region *P4_io[4096];
47 int num_io_rgns = 0, num_mem_rgns = 0;
49 void *mem_alloc_pages( int n )
50 {
51 void *mem = mmap( NULL, n * 4096,
52 PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0 );
53 if( mem == MAP_FAILED ) {
54 ERROR( "Memory allocation failure! (%s)", strerror(errno) );
55 return NULL;
56 }
57 return mem;
58 }
61 void mem_init( void )
62 {
63 page_map = mmap( NULL, sizeof(char *) * PAGE_TABLE_ENTRIES,
64 PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0 );
65 if( page_map == MAP_FAILED ) {
66 ERROR( "Unable to allocate page map! (%s)", strerror(errno) );
67 page_map = NULL;
68 return;
69 }
71 memset( page_map, 0, sizeof(uint32_t) * PAGE_TABLE_ENTRIES );
72 }
74 void mem_reset( void )
75 {
76 /* Restore all mmio registers to their initial settings */
77 int i, j;
78 for( i=1; i<num_io_rgns; i++ ) {
79 for( j=0; io_rgn[i]->ports[j].id != NULL; j++ ) {
80 if( io_rgn[i]->ports[j].def_val != UNDEFINED &&
81 io_rgn[i]->ports[j].def_val != *io_rgn[i]->ports[j].val ) {
82 io_rgn[i]->io_write( io_rgn[i]->ports[j].offset,
83 io_rgn[i]->ports[j].def_val );
84 }
85 }
86 }
87 }
89 void mem_save( FILE *f )
90 {
91 int i;
92 uint32_t len;
94 /* All memory regions */
95 fwrite( &num_mem_rgns, sizeof(num_mem_rgns), 1, f );
96 for( i=0; i<num_mem_rgns; i++ ) {
97 fwrite_string( mem_rgn[i].name, f );
98 fwrite( &mem_rgn[i].base, sizeof(uint32_t), 1, f );
99 fwrite( &mem_rgn[i].flags, sizeof(int), 1, f );
100 fwrite( &mem_rgn[i].size, sizeof(uint32_t), 1, f );
101 if( mem_rgn[i].flags != MEM_FLAG_ROM )
102 fwrite_gzip( mem_rgn[i].mem, mem_rgn[i].size, 1, f );
103 }
105 /* All MMIO regions */
106 fwrite( &num_io_rgns, sizeof(num_io_rgns), 1, f );
107 for( i=0; i<num_io_rgns; i++ ) {
108 fwrite_string( io_rgn[i]->id, f );
109 fwrite( &io_rgn[i]->base, sizeof( uint32_t ), 1, f );
110 len = 4096;
111 fwrite( &len, sizeof(len), 1, f );
112 fwrite_gzip( io_rgn[i]->mem, len, 1, f );
113 }
114 }
116 int mem_load( FILE *f )
117 {
118 char tmp[64];
119 uint32_t len;
120 uint32_t base, size;
121 int flags;
122 int i;
124 /* All memory regions */
125 fread( &len, sizeof(len), 1, f );
126 if( len != num_mem_rgns )
127 return -1;
128 for( i=0; i<len; i++ ) {
129 fread_string( tmp, sizeof(tmp), f );
130 fread( &base, sizeof(base), 1, f );
131 fread( &flags, sizeof(flags), 1, f );
132 fread( &size, sizeof(size), 1, f );
133 if( strcmp( mem_rgn[i].name, tmp ) != 0 ||
134 base != mem_rgn[i].base ||
135 flags != mem_rgn[i].flags ||
136 size != mem_rgn[i].size ) {
137 ERROR( "Bad memory region %d %s", i, tmp );
138 return -1;
139 }
140 if( flags != MEM_FLAG_ROM )
141 fread_gzip( mem_rgn[i].mem, size, 1, f );
142 }
144 /* All MMIO regions */
145 fread( &len, sizeof(len), 1, f );
146 if( len != num_io_rgns )
147 return -1;
148 for( i=0; i<len; i++ ) {
149 fread_string( tmp, sizeof(tmp), f );
150 fread( &base, sizeof(base), 1, f );
151 fread( &size, sizeof(size), 1, f );
152 if( strcmp( io_rgn[i]->id, tmp ) != 0 ||
153 base != io_rgn[i]->base ||
154 size != 4096 ) {
155 ERROR( "Bad MMIO region %d %s", i, tmp );
156 return -1;
157 }
158 fread_gzip( io_rgn[i]->mem, size, 1, f );
159 }
160 return 0;
161 }
163 int mem_save_block( const gchar *file, uint32_t start, uint32_t length )
164 {
165 char *region;
166 int len = 4096, total = 0;
167 uint32_t addr = start;
168 FILE *f = fopen(file,"w");
170 if( f == NULL )
171 return errno;
173 while( total < length ) {
174 region = mem_get_region(addr);
175 len = 4096 - (addr & 0x0FFF);
176 if( len > (length-total) )
177 len = (length-total);
178 if( fwrite( region, len, 1, f ) != 1 ) {
179 ERROR( "Unexpected error: %d %d", len, errno );
180 break;
181 }
183 addr += len;
184 total += len;
185 }
186 fclose( f );
187 INFO( "Loaded %d of %d bytes to %08X", total, length, start );
188 return 0;
189 }
191 int mem_load_block( const gchar *file, uint32_t start, uint32_t length )
192 {
193 char *region;
194 int len = 4096, total = 0;
195 uint32_t addr = start;
196 struct stat st;
197 FILE *f = fopen(file,"r");
199 if( f == NULL ) {
200 ERROR( "Unable to load file '%s': %s", file, strerror(errno) );
201 return -1;
202 }
203 fstat( fileno(f), &st );
204 if( length == 0 || length == -1 || length > st.st_size )
205 length = st.st_size;
207 while( total < length ) {
208 region = mem_get_region(addr);
209 len = 4096 - (addr & 0x0FFF);
210 if( len > (length-total) )
211 len = (length-total);
212 if( fread( region, len, 1, f ) != 1 ) {
213 ERROR( "Unexpected error: %d %d", len, errno );
214 break;
215 }
217 addr += len;
218 total += len;
219 }
220 fclose( f );
221 INFO( "Loaded %d of %d bytes to %08X", total, length, start );
222 return 0;
223 }
225 struct mem_region *mem_map_region( void *mem, uint32_t base, uint32_t size,
226 const char *name, int flags, uint32_t repeat_offset,
227 uint32_t repeat_until )
228 {
229 int i;
230 mem_rgn[num_mem_rgns].base = base;
231 mem_rgn[num_mem_rgns].size = size;
232 mem_rgn[num_mem_rgns].flags = flags;
233 mem_rgn[num_mem_rgns].name = name;
234 mem_rgn[num_mem_rgns].mem = mem;
235 num_mem_rgns++;
237 do {
238 for( i=0; i<size>>PAGE_BITS; i++ )
239 page_map[(base>>PAGE_BITS)+i] = mem + (i<<PAGE_BITS);
240 base += repeat_offset;
241 } while( base <= repeat_until );
243 return &mem_rgn[num_mem_rgns-1];
244 }
246 void *mem_create_ram_region( uint32_t base, uint32_t size, const char *name )
247 {
248 return mem_create_repeating_ram_region( base, size, name, size, base );
249 }
251 void *mem_create_repeating_ram_region( uint32_t base, uint32_t size, const char *name,
252 uint32_t repeat_offset, uint32_t repeat_until )
253 {
254 char *mem;
256 assert( (base&0xFFFFF000) == base ); /* must be page aligned */
257 assert( (size&0x00000FFF) == 0 );
258 assert( num_mem_rgns < MAX_MEM_REGIONS );
259 assert( page_map != NULL );
261 mem = mem_alloc_pages( size>>PAGE_BITS );
263 mem_map_region( mem, base, size, name, MEM_FLAG_RAM, repeat_offset, repeat_until );
265 return mem;
266 }
268 void *mem_load_rom( const gchar *file, uint32_t base, uint32_t size, uint32_t crc,
269 const gchar *region_name )
270 {
271 char *mem;
272 int fd;
273 uint32_t calc_crc;
275 mem = mem_get_region(base);
276 if( mem == NULL ) {
277 mem = mmap( NULL, size, PROT_WRITE|PROT_READ, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0 );
278 if( mem == MAP_FAILED ) {
279 ERROR( "Unable to allocate ROM memory: %s (%s)", file, strerror(errno) );
280 return NULL;
281 }
282 mem_map_region( mem, base, size, file, MEM_FLAG_ROM, size, base );
283 } else {
284 mprotect( mem, size, PROT_READ|PROT_WRITE );
285 }
287 mem_load_block( file, base, size );
288 mprotect( mem, size, PROT_READ );
290 /* CRC check */
291 calc_crc = crc32(0L, (unsigned char *)mem, size);
292 if( calc_crc != crc ) {
293 WARN( "Bios CRC Mismatch in %s: %08X (expected %08X)",
294 file, calc_crc, crc);
295 }
297 return mem;
298 }
300 char *mem_get_region_by_name( const char *name )
301 {
302 int i;
303 for( i=0; i<num_mem_rgns; i++ ) {
304 if( strcmp( mem_rgn[i].name, name ) == 0 )
305 return mem_rgn[i].mem;
306 }
307 return NULL;
308 }
310 void register_io_region( struct mmio_region *io )
311 {
312 int i;
314 assert(io);
315 io->mem = mem_alloc_pages(2);
316 io->save_mem = io->mem + PAGE_SIZE;
317 io->index = (struct mmio_port **)malloc(1024*sizeof(struct mmio_port *));
318 io->trace_flag = 0;
319 memset( io->index, 0, 1024*sizeof(struct mmio_port *) );
320 for( i=0; io->ports[i].id != NULL; i++ ) {
321 io->ports[i].val = (uint32_t *)(io->mem + io->ports[i].offset);
322 *io->ports[i].val = io->ports[i].def_val;
323 io->index[io->ports[i].offset>>2] = &io->ports[i];
324 }
325 memcpy( io->save_mem, io->mem, PAGE_SIZE );
326 if( (io->base & 0xFF000000) == 0xFF000000 ) {
327 /* P4 area (on-chip I/O channels */
328 P4_io[(io->base&0x1FFFFFFF)>>19] = io;
329 } else {
330 page_map[io->base>>12] = (char *)num_io_rgns;
331 }
332 io_rgn[num_io_rgns] = io;
333 num_io_rgns++;
334 }
336 void register_io_regions( struct mmio_region **io )
337 {
338 while( *io ) register_io_region( *io++ );
339 }
341 int mem_has_page( uint32_t addr )
342 {
343 char *page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];
344 return page != NULL;
345 }
347 char *mem_get_page( uint32_t addr )
348 {
349 char *page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];
350 return page;
351 }
353 char *mem_get_region( uint32_t addr )
354 {
355 char *page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];
356 if( ((uint32_t)page) < MAX_IO_REGIONS ) { /* IO Region */
357 return NULL;
358 } else {
359 return page+(addr&0xFFF);
360 }
361 }
363 struct mmio_region *mem_get_io_region( uint32_t addr )
364 {
365 if( addr > 0xFF000000 ) {
366 return P4_io[(addr&0x00FFFFFF)>>12];
367 }
368 char *page = page_map[(addr&0x1FFFFFFF)>>12];
369 if( ((uint32_t)page) < MAX_IO_REGIONS ) {
370 return io_rgn[(uint32_t)page];
371 } else {
372 return NULL;
373 }
374 }
376 void mem_set_trace( uint32_t addr, int flag )
377 {
378 struct mmio_region *region = mem_get_io_region(addr);
379 if( region != NULL )
380 region->trace_flag = flag;
381 }
.