filename | src/dreamcast.c |
changeset | 89:939afb9f0f98 |
prev | 71:fcde57dbf968 |
next | 144:7f0714e89aaa |
author | nkeynes |
date | Wed Feb 15 13:11:50 2006 +0000 (18 years ago) |
permissions | -rw-r--r-- |
last change | Split pvr2.c out to separate files for TA and renderer, minor renames change pvrdma to use mem_copy_to_sh4 |
view | annotate | diff | log | raw |
1 /**
2 * $Id: dreamcast.c,v 1.14 2006-01-22 22:42:05 nkeynes Exp $
3 * Central switchboard for the system. This pulls all the individual modules
4 * together into some kind of coherent structure. This is also where you'd
5 * add Naomi support, if I ever get a board to play with...
6 *
7 * Copyright (c) 2005 Nathan Keynes.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 */
20 #include <errno.h>
21 #include "dream.h"
22 #include "mem.h"
23 #include "aica/aica.h"
24 #include "asic.h"
25 #include "dreamcast.h"
26 #include "gdrom/ide.h"
27 #include "maple/maple.h"
29 /**
30 * Current state of the DC virtual machine
31 */
32 #define STATE_UNINIT 0
33 #define STATE_RUNNING 1
34 #define STATE_STOPPING 2
35 #define STATE_STOPPED 3
36 static volatile int dreamcast_state = STATE_UNINIT;
37 static uint32_t timeslice_length = DEFAULT_TIMESLICE_LENGTH;
38 static char *dreamcast_config = "DEFAULT";
40 #define MAX_MODULES 32
41 static int num_modules = 0;
42 dreamcast_module_t modules[MAX_MODULES];
44 /**
45 * The unknown module is used for logging files without an actual module
46 * declaration
47 */
48 struct dreamcast_module unknown_module = { "****", NULL, NULL, NULL, NULL,
49 NULL, NULL, NULL };
51 /**
52 * This function is responsible for defining how all the pieces of the
53 * dreamcast actually fit together.
54 *
55 * Note currently the locations of the various MMIO pages are hard coded in
56 * the MMIO definitions - they should probably be moved here.
57 */
58 void dreamcast_configure( )
59 {
60 /* Register the memory framework */
61 dreamcast_register_module( &mem_module );
63 /* Setup standard memory map */
64 mem_create_ram_region( 0x0C000000, 16 MB, MEM_REGION_MAIN );
65 mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
66 mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
67 mem_create_ram_region( 0x05000000, 8 MB, MEM_REGION_VIDEO );
68 mem_load_rom( "dcboot.rom", 0x00000000, 0x00200000, 0x89f2b1a1 );
69 mem_load_rom( "dcflash.rom",0x00200000, 0x00020000, 0x357c3568 );
71 /* Load in the rest of the core modules */
72 dreamcast_register_module( &sh4_module );
73 dreamcast_register_module( &asic_module );
74 dreamcast_register_module( &pvr2_module );
75 dreamcast_register_module( &aica_module );
76 dreamcast_register_module( &maple_module );
77 dreamcast_register_module( &ide_module );
79 /* Attach any default maple devices, ie a pair of controllers */
80 maple_device_t controller1 = controller_new();
81 maple_device_t controller2 = controller_new();
82 maple_attach_device( controller1, 0, 0 );
83 maple_attach_device( controller2, 1, 0 );
84 }
86 /**
87 * Constructs a system configuration for the AICA in standalone mode,
88 * ie sound chip only.
89 */
90 void dreamcast_configure_aica_only( )
91 {
92 dreamcast_register_module( &mem_module );
93 mem_create_ram_region( 0x00800000, 2 MB, MEM_REGION_AUDIO );
94 mem_create_ram_region( 0x00703000, 8 KB, MEM_REGION_AUDIO_SCRATCH );
95 dreamcast_register_module( &aica_module );
96 aica_enable();
97 dreamcast_state = STATE_STOPPED;
98 }
100 void dreamcast_register_module( dreamcast_module_t module )
101 {
102 modules[num_modules++] = module;
103 if( module->init != NULL )
104 module->init();
105 }
108 void dreamcast_init( void )
109 {
110 dreamcast_configure();
111 dreamcast_state = STATE_STOPPED;
112 }
114 void dreamcast_reset( void )
115 {
116 int i;
117 for( i=0; i<num_modules; i++ ) {
118 if( modules[i]->reset != NULL )
119 modules[i]->reset();
120 }
121 }
123 void dreamcast_run( void )
124 {
125 int i;
126 if( dreamcast_state != STATE_RUNNING ) {
127 for( i=0; i<num_modules; i++ ) {
128 if( modules[i]->start != NULL )
129 modules[i]->start();
130 }
131 }
132 dreamcast_state = STATE_RUNNING;
133 while( dreamcast_state == STATE_RUNNING ) {
134 int time_to_run = timeslice_length;
135 for( i=0; i<num_modules; i++ ) {
136 if( modules[i]->run_time_slice != NULL )
137 time_to_run = modules[i]->run_time_slice( time_to_run );
138 }
140 }
142 for( i=0; i<num_modules; i++ ) {
143 if( modules[i]->stop != NULL )
144 modules[i]->stop();
145 }
146 dreamcast_state = STATE_STOPPED;
147 }
149 void dreamcast_stop( void )
150 {
151 if( dreamcast_state == STATE_RUNNING )
152 dreamcast_state = STATE_STOPPING;
153 }
155 gboolean dreamcast_is_running( void )
156 {
157 return dreamcast_state == STATE_RUNNING;
158 }
160 /***************************** User Configuration **************************/
162 void dreamcast_load_config( const gchar *filename )
163 {
166 }
168 void dreamcast_save_config( const gchar *filename )
169 {
172 }
174 /********************************* Save States *****************************/
176 #define DREAMCAST_SAVE_MAGIC "%!-DreamOn!Save\0"
177 #define DREAMCAST_SAVE_VERSION 0x00010000
179 struct save_state_header {
180 char magic[16];
181 uint32_t version;
182 uint32_t module_count;
183 };
185 int dreamcast_load_state( const gchar *filename )
186 {
187 int i,j;
188 uint32_t count, len;
189 int have_read[MAX_MODULES];
190 char tmp[64];
191 struct save_state_header header;
192 FILE *f;
194 f = fopen( filename, "r" );
195 if( f == NULL ) return errno;
197 fread( &header, sizeof(header), 1, f );
198 if( strncmp( header.magic, DREAMCAST_SAVE_MAGIC, 16 ) != 0 ) {
199 ERROR( "Not a DreamOn save state file" );
200 return 1;
201 }
202 if( header.version != DREAMCAST_SAVE_VERSION ) {
203 ERROR( "DreamOn save state version not supported" );
204 return 1;
205 }
206 if( header.module_count > MAX_MODULES ) {
207 ERROR( "DreamOn save state is corrupted (bad module count)" );
208 return 1;
209 }
210 for( i=0; i<MAX_MODULES; i++ ) {
211 have_read[i] = 0;
212 }
214 for( i=0; i<header.module_count; i++ ) {
215 fread(tmp, 4, 1, f );
216 if( strncmp(tmp, "BLCK", 4) != 0 ) {
217 ERROR( "DreamOn save state is corrupted (missing block header %d)", i );
218 return 2;
219 }
220 len = fread_string(tmp, sizeof(tmp), f );
221 if( len > 64 || len < 1 ) {
222 ERROR( "DreamOn save state is corrupted (bad string)" );
223 return 2;
224 }
226 /* Find the matching module by name */
227 for( j=0; j<num_modules; j++ ) {
228 if( strcmp(modules[j]->name,tmp) == 0 ) {
229 have_read[j] = 1;
230 if( modules[j]->load == NULL ) {
231 ERROR( "DreamOn save state is corrupted (no loader for %s)", modules[j]->name );
232 return 2;
233 } else if( modules[j]->load(f) != 0 ) {
234 ERROR( "DreamOn save state is corrupted (%s failed)", modules[j]->name );
235 return 2;
236 }
237 break;
238 }
239 }
240 if( j == num_modules ) {
241 ERROR( "DreamOn save state contains unrecognized section" );
242 return 2;
243 }
244 }
246 /* Any modules that we didn't load - reset to the default state.
247 * (ie it's not an error to skip a module if you don't actually
248 * care about its state).
249 */
250 for( j=0; j<num_modules; j++ ) {
251 if( have_read[j] == 0 && modules[j]->reset != NULL ) {
252 modules[j]->reset();
253 }
254 }
255 fclose(f);
256 INFO( "Save state read from %s", filename );
257 }
259 int dreamcast_save_state( const gchar *filename )
260 {
261 int i;
262 FILE *f;
263 struct save_state_header header;
265 f = fopen( filename, "w" );
266 if( f == NULL )
267 return errno;
268 strcpy( header.magic, DREAMCAST_SAVE_MAGIC );
269 header.version = DREAMCAST_SAVE_VERSION;
270 header.module_count = 0;
272 for( i=0; i<num_modules; i++ ) {
273 if( modules[i]->save != NULL )
274 header.module_count++;
275 }
276 fwrite( &header, sizeof(header), 1, f );
277 for( i=0; i<num_modules; i++ ) {
278 if( modules[i]->save != NULL ) {
279 fwrite( "BLCK", 4, 1, f );
280 fwrite_string( modules[i]->name, f );
281 modules[i]->save(f);
282 }
283 }
284 fclose( f );
285 INFO( "Save state written to %s", filename );
286 }
.