lxdream 0.9.1| filename | src/gdrom/gdrom.c |
| changeset | 1097:d4807997e450 |
| prev | 1074:397d77b6e346 |
| next | 1101:78e762cec843 |
| author | nkeynes |
| date | Mon Feb 15 17:27:14 2010 +1000 (14 years ago) |
| permissions | -rw-r--r-- |
| last change | Hook up the fake bios boot Use fakebios if invoked with -b, or if there's no boot rom loaded |
| view | annotate | diff | log | raw |
1 /**
2 * $Id$
3 *
4 * GD-Rom access functions.
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 */
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <fcntl.h>
23 #include <errno.h>
24 #include <ctype.h>
25 #include <glib/gutils.h>
26 #include <netinet/in.h>
27 #include "gdrom/ide.h"
28 #include "gdrom/gdrom.h"
29 #include "gdrom/packet.h"
30 #include "bootstrap.h"
31 #include "drivers/cdrom/cdrom.h"
33 #define GDROM_LBA_OFFSET 150
35 DEFINE_HOOK( gdrom_disc_change_hook, gdrom_disc_change_hook_t )
37 static void gdrom_fire_disc_changed( cdrom_disc_t disc )
38 {
39 CALL_HOOKS( gdrom_disc_change_hook, disc, disc == NULL ? NULL : disc->name );
40 }
42 gboolean gdrom_disc_read_title( cdrom_disc_t disc, char *title, size_t titlelen );
44 struct gdrom_drive {
45 cdrom_disc_t disc;
46 int boot_track;
47 char title[129];
48 } gdrom_drive;
50 void gdrom_mount_disc( cdrom_disc_t disc )
51 {
52 if( disc != gdrom_drive.disc ) {
53 cdrom_disc_unref(gdrom_drive.disc);
54 gdrom_drive.disc = disc;
55 cdrom_disc_ref(disc);
56 gdrom_disc_read_title( disc, gdrom_drive.title, sizeof(gdrom_drive.title) );
57 gdrom_fire_disc_changed( disc );
58 }
59 }
61 gboolean gdrom_mount_image( const gchar *filename )
62 {
63 cdrom_disc_t disc = cdrom_disc_open(filename, NULL);
64 if( disc != NULL ) {
65 gdrom_mount_disc( disc );
66 return TRUE;
67 }
68 return FALSE;
69 }
71 void gdrom_unmount_disc( )
72 {
73 if( gdrom_drive.disc != NULL ) {
74 cdrom_disc_unref(gdrom_drive.disc);
75 gdrom_fire_disc_changed(NULL);
76 gdrom_drive.disc = NULL;
77 }
78 }
80 cdrom_disc_t gdrom_get_current_disc()
81 {
82 return gdrom_drive.disc;
83 }
85 const gchar *gdrom_get_current_disc_name()
86 {
87 if( gdrom_drive.disc == NULL ) {
88 return NULL;
89 } else {
90 return gdrom_drive.disc->name;
91 }
92 }
94 const gchar *gdrom_get_current_disc_title()
95 {
96 if( gdrom_drive.disc == NULL || gdrom_drive.title[0] == '\0' ) {
97 return NULL;
98 } else {
99 return gdrom_drive.title;
100 }
101 }
103 #define CHECK_DISC() do { \
104 if( gdrom_drive.disc == NULL || gdrom_drive.disc->disc_type == CDROM_DISC_NONE ) { return CDROM_ERROR_NODISC; } \
105 } while(0)
107 cdrom_error_t gdrom_check_media( )
108 {
109 CHECK_DISC();
110 return CDROM_ERROR_OK;
111 }
113 cdrom_error_t gdrom_read_toc( unsigned char *buf )
114 {
115 struct gdrom_toc {
116 uint32_t track[99];
117 uint32_t first, last, leadout;
118 };
120 struct gdrom_toc *toc = (struct gdrom_toc *)buf;
121 int i;
123 CHECK_DISC();
124 cdrom_disc_t disc = gdrom_drive.disc;
126 for( i=0; i<disc->track_count; i++ ) {
127 toc->track[i] = htonl( disc->track[i].lba+GDROM_LBA_OFFSET ) | disc->track[i].flags;
128 }
129 toc->first = 0x0100 | disc->track[0].flags;
130 toc->last = (disc->track_count<<8) | disc->track[i-1].flags;
131 toc->leadout = htonl(disc->leadout+GDROM_LBA_OFFSET) |
132 disc->track[i-1].flags;
133 for( ;i<99; i++ )
134 toc->track[i] = 0xFFFFFFFF;
135 return PKT_ERR_OK;
136 }
138 cdrom_error_t gdrom_read_session( int session, unsigned char *buf )
139 {
140 cdrom_lba_t lba;
141 CHECK_DISC();
143 buf[0] = 0x01; /* Disc status? */
144 buf[1] = 0;
147 if( session == 0 ) {
148 buf[2] = gdrom_drive.disc->session_count;
149 lba = gdrom_drive.disc->leadout + GDROM_LBA_OFFSET;
150 } else {
151 cdrom_track_t track = cdrom_disc_get_session( gdrom_drive.disc, session );
152 if( track == NULL )
153 return CDROM_ERROR_BADFIELD;
155 buf[2] = track->trackno;
156 lba = track->lba + GDROM_LBA_OFFSET;
157 }
158 buf[3] = (lba >> 16) & 0xFF;
159 buf[4] = (lba >> 8) & 0xFF;
160 buf[5] = lba & 0xFF;
161 return CDROM_ERROR_OK;
162 }
164 cdrom_error_t gdrom_read_short_status( cdrom_lba_t lba, unsigned char *buf )
165 {
166 cdrom_lba_t real_lba = lba - GDROM_LBA_OFFSET;
167 CHECK_DISC();
169 cdrom_track_t track = cdrom_disc_get_track_by_lba( gdrom_drive.disc, real_lba );
170 if( track == NULL ) {
171 track = cdrom_disc_get_track( gdrom_drive.disc, 1 );
172 if( track == NULL )
173 return CDROM_ERROR_NODISC;
174 lba = 150;
175 }
176 uint32_t offset = real_lba - track->lba;
177 buf[0] = 0x00;
178 buf[1] = 0x15; /* audio status ? */
179 buf[2] = 0x00;
180 buf[3] = 0x0E;
181 buf[4] = track->flags;
182 buf[5] = track->trackno;
183 buf[6] = 0x01; /* ?? */
184 buf[7] = (offset >> 16) & 0xFF;
185 buf[8] = (offset >> 8) & 0xFF;
186 buf[9] = offset & 0xFF;
187 buf[10] = 0;
188 buf[11] = (lba >> 16) & 0xFF;
189 buf[12] = (lba >> 8) & 0xFF;
190 buf[13] = lba & 0xFF;
191 return PKT_ERR_OK;
192 }
194 int gdrom_get_drive_status( )
195 {
196 if( gdrom_drive.disc == NULL ) {
197 return CDROM_DISC_NONE;
198 }
200 if( cdrom_disc_check_media(gdrom_drive.disc) == CDROM_DISC_NONE ) {
201 return CDROM_DISC_NONE;
202 } else {
203 return gdrom_drive.disc->disc_type | IDE_DISC_READY;
204 }
205 }
207 cdrom_error_t gdrom_play_audio( cdrom_lba_t lba, cdrom_count_t count )
208 {
209 CHECK_DISC();
210 if( gdrom_drive.disc->play_audio ) {
211 return gdrom_drive.disc->play_audio( gdrom_drive.disc, lba - GDROM_LBA_OFFSET, count );
212 }
213 return CDROM_ERROR_BADFIELD;
214 }
216 /* Parse CD read */
217 #define READ_CD_MODE(x) ((x)&0x0E)
218 #define READ_CD_MODE_ANY 0x00
219 #define READ_CD_MODE_CDDA 0x02
220 #define READ_CD_MODE_1 0x04
221 #define READ_CD_MODE_2 0x06
222 #define READ_CD_MODE_2_FORM_1 0x08
223 #define READ_CD_MODE_2_FORM_2 0x0A
225 #define READ_CD_CHANNELS(x) ((x)&0xF0)
226 #define READ_CD_HEADER(x) ((x)&0x80)
227 #define READ_CD_SUBHEAD(x) ((x)&0x40)
228 #define READ_CD_DATA(x) ((x)&0x20)
229 #define READ_CD_RAW(x) ((x)&0x10)
232 cdrom_error_t gdrom_read_cd( cdrom_lba_t lba, cdrom_count_t count,
233 unsigned mode, unsigned char *buf, size_t *length )
234 {
235 cdrom_lba_t real_lba = lba - 150;
236 cdrom_read_mode_t real_mode = 0;
238 CHECK_DISC();
240 /* Translate GDROM read mode into standard MMC read mode */
241 if( READ_CD_RAW(mode) ) {
242 real_mode = CDROM_READ_RAW;
243 } else {
244 if( READ_CD_HEADER(mode) ) {
245 real_mode = CDROM_READ_HEADER|CDROM_READ_SYNC;
246 }
247 if( READ_CD_SUBHEAD(mode) ) {
248 real_mode |= CDROM_READ_SUBHEADER;
249 }
250 if( READ_CD_DATA(mode) ) {
251 real_mode |= CDROM_READ_DATA;
252 }
253 }
255 if( READ_CD_MODE(mode) == 0x0C )
256 real_mode |= CDROM_READ_MODE2;
257 else
258 real_mode |= (READ_CD_MODE(mode)<<1);
260 return cdrom_disc_read_sectors( gdrom_drive.disc, real_lba, count, real_mode, buf, length );
261 }
263 void gdrom_run_slice( uint32_t nanosecs )
264 {
266 }
269 cdrom_track_t gdrom_disc_get_boot_track( cdrom_disc_t disc ) {
270 int i, boot_track = -1;
271 if( disc != NULL && disc->track_count > 0 ) {
272 int last_session = disc->track[disc->track_count-1].sessionno;
273 if( last_session == 1 )
274 return NULL;
275 for( i=disc->track_count-1; i>=0 && disc->track[i].sessionno == last_session; i-- ) {
276 if( disc->track[i].flags & TRACK_FLAG_DATA ) {
277 boot_track = i;
278 }
279 }
280 }
281 return &disc->track[boot_track];
282 }
284 /**
285 * Check the disc for a useable DC bootstrap, and update the disc
286 * with the title accordingly. Otherwise set the title to the empty string.
287 * @return TRUE if we found a bootstrap, otherwise FALSE.
288 */
289 gboolean gdrom_disc_read_title( cdrom_disc_t disc, char *title, size_t titlelen ) {
290 cdrom_track_t boot_track = gdrom_disc_get_boot_track(disc);
291 int i;
292 if( boot_track != NULL ) {
293 unsigned char boot_sector[CDROM_MAX_SECTOR_SIZE];
294 size_t length = sizeof(boot_sector);
295 if( cdrom_disc_read_sectors( disc, boot_track->lba, 1, CDROM_READ_DATA|CDROM_READ_MODE2_FORM1,
296 boot_sector, &length ) == CDROM_ERROR_OK ) {
297 if( memcmp( boot_sector, "SEGA SEGAKATANA SEGA ENTERPRISES", 32) == 0 ) {
298 /* Got magic */
299 dc_bootstrap_head_t bootstrap = (dc_bootstrap_head_t)boot_sector;
300 for( i=128; i>0; i-- ) {
301 if( !isspace(bootstrap->product_name[i-1]) )
302 break;
303 }
304 if( i >= titlelen )
305 i = (titlelen-1);
306 memcpy( title, bootstrap->product_name, i );
307 title[i] = '\0';
308 }
309 bootstrap_dump(boot_sector, FALSE);
310 return TRUE;
311 }
312 }
313 title[0] = '\0';
314 return FALSE;
315 }
.