filename | src/mem.c |
changeset | 72:ceb5985fa8d8 |
prev | 50:704b11c879cb |
next | 146:f91fa34ab219 |
author | nkeynes |
date | Thu Mar 30 11:29:54 2006 +0000 (18 years ago) |
permissions | -rw-r--r-- |
last change | Differentiate between flat + gouraud shaded polys - use colour of first vertex only Remove vertex count checks - doesn't seem to be correct anyway. Add check for unrecognized command codes other minor tweaks |
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1 /**
2 * $Id: mem.c,v 1.11 2006-01-10 14:00:00 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( 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( 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( 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( 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 struct stat st;
169 FILE *f = fopen(file,"w");
171 if( f == NULL )
172 return errno;
174 while( total < length ) {
175 region = mem_get_region(addr);
176 len = 4096 - (addr & 0x0FFF);
177 if( len > (length-total) )
178 len = (length-total);
179 if( fwrite( region, len, 1, f ) != 1 ) {
180 ERROR( "Unexpected error: %d %d", len, errno );
181 break;
182 }
184 addr += len;
185 total += len;
186 }
187 fclose( f );
188 INFO( "Loaded %d of %d bytes to %08X", total, length, start );
189 return 0;
190 }
192 int mem_load_block( const gchar *file, uint32_t start, uint32_t length )
193 {
194 char *region;
195 int len = 4096, total = 0;
196 uint32_t addr = start;
197 struct stat st;
198 FILE *f = fopen(file,"r");
200 if( f == NULL )
201 return errno;
202 fstat( fileno(f), &st );
203 if( length == 0 || length == -1 || length > st.st_size )
204 length = st.st_size;
206 while( total < length ) {
207 region = mem_get_region(addr);
208 len = 4096 - (addr & 0x0FFF);
209 if( len > (length-total) )
210 len = (length-total);
211 if( fread( region, len, 1, f ) != 1 ) {
212 ERROR( "Unexpected error: %d %d", len, errno );
213 break;
214 }
216 addr += len;
217 total += len;
218 }
219 fclose( f );
220 INFO( "Loaded %d of %d bytes to %08X", total, length, start );
221 return 0;
222 }
224 struct mem_region *mem_map_region( void *mem, uint32_t base, uint32_t size,
225 char *name, int flags )
226 {
227 int i;
228 mem_rgn[num_mem_rgns].base = base;
229 mem_rgn[num_mem_rgns].size = size;
230 mem_rgn[num_mem_rgns].flags = flags;
231 mem_rgn[num_mem_rgns].name = name;
232 mem_rgn[num_mem_rgns].mem = mem;
233 num_mem_rgns++;
235 for( i=0; i<size>>PAGE_BITS; i++ )
236 page_map[(base>>PAGE_BITS)+i] = mem + (i<<PAGE_BITS);
238 return &mem_rgn[num_mem_rgns-1];
239 }
241 void *mem_create_ram_region( uint32_t base, uint32_t size, char *name )
242 {
243 char *mem;
245 assert( (base&0xFFFFF000) == base ); /* must be page aligned */
246 assert( (size&0x00000FFF) == 0 );
247 assert( num_mem_rgns < MAX_MEM_REGIONS );
248 assert( page_map != NULL );
250 mem = mem_alloc_pages( size>>PAGE_BITS );
252 mem_map_region( mem, base, size, name, MEM_FLAG_RAM );
253 return mem;
254 }
256 void *mem_load_rom( char *file, uint32_t base, uint32_t size, uint32_t crc )
257 {
258 char buf[512], *mem;
259 int fd;
260 uint32_t calc_crc;
261 snprintf( buf, 512, "%s/%s",BIOS_PATH, file );
262 fd = open( buf, O_RDONLY );
263 if( fd == -1 ) {
264 ERROR( "Bios file not found: %s", buf );
265 return NULL;
266 }
267 mem = mmap( NULL, size, PROT_READ, MAP_PRIVATE, fd, 0 );
268 if( mem == MAP_FAILED ) {
269 ERROR( "Unable to map bios file: %s (%s)", file, strerror(errno) );
270 close(fd);
271 return NULL;
272 }
273 mem_map_region( mem, base, size, file, MEM_FLAG_ROM );
275 /* CRC check */
276 calc_crc = crc32(0L, mem, size);
277 if( calc_crc != crc ) {
278 WARN( "Bios CRC Mismatch in %s: %08X (expected %08X)",
279 file, calc_crc, crc);
280 }
282 return mem;
283 }
285 char *mem_get_region_by_name( char *name )
286 {
287 int i;
288 for( i=0; i<num_mem_rgns; i++ ) {
289 if( strcmp( mem_rgn[i].name, name ) == 0 )
290 return mem_rgn[i].mem;
291 }
292 return NULL;
293 }
295 void register_io_region( struct mmio_region *io )
296 {
297 int i;
299 assert(io);
300 io->mem = mem_alloc_pages(2);
301 io->save_mem = io->mem + PAGE_SIZE;
302 io->index = (struct mmio_port **)malloc(1024*sizeof(struct mmio_port *));
303 io->trace_flag = 0;
304 memset( io->index, 0, 1024*sizeof(struct mmio_port *) );
305 for( i=0; io->ports[i].id != NULL; i++ ) {
306 io->ports[i].val = (uint32_t *)(io->mem + io->ports[i].offset);
307 *io->ports[i].val = io->ports[i].def_val;
308 io->index[io->ports[i].offset>>2] = &io->ports[i];
309 }
310 memcpy( io->save_mem, io->mem, PAGE_SIZE );
311 if( (io->base & 0xFF000000) == 0xFF000000 ) {
312 /* P4 area (on-chip I/O channels */
313 P4_io[(io->base&0x1FFFFFFF)>>19] = io;
314 } else {
315 page_map[io->base>>12] = (char *)num_io_rgns;
316 }
317 io_rgn[num_io_rgns] = io;
318 num_io_rgns++;
319 }
321 void register_io_regions( struct mmio_region **io )
322 {
323 while( *io ) register_io_region( *io++ );
324 }
326 int mem_has_page( uint32_t addr )
327 {
328 char *page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];
329 return page != NULL;
330 }
332 char *mem_get_page( uint32_t addr )
333 {
334 char *page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];
335 return page;
336 }
338 char *mem_get_region( uint32_t addr )
339 {
340 char *page = page_map[ (addr & 0x1FFFFFFF) >> 12 ];
341 if( ((uint32_t)page) < MAX_IO_REGIONS ) { /* IO Region */
342 return NULL;
343 } else {
344 return page+(addr&0xFFF);
345 }
346 }
.