lxdream 0.9.1| filename | src/gdrom/gdimage.c |
| changeset | 561:533f6b478071 |
| prev | 498:10d5ba99a778 |
| next | 640:01b50fd48035 |
| author | nkeynes |
| date | Fri Feb 08 00:06:56 2008 +0000 (16 years ago) |
| permissions | -rw-r--r-- |
| last change | Fix LDS/STS to FPUL/FPSCR to check the FPU disabled bit. Fixes the linux 2.4.0-test8 kernel boot (this wasn't exactly very well documented in the original manual) |
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1 /**
2 * $Id$
3 *
4 * GD-Rom image-file common 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 <netinet/in.h>
21 #include "gdrom/gdrom.h"
22 #include "gdrom/packet.h"
23 #include "bootstrap.h"
25 static void gdrom_image_destroy( gdrom_disc_t disc );
26 static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba, int mode,
27 unsigned char *buf, uint32_t *readlength );
28 static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, unsigned char *buf );
29 static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, unsigned char *buf );
30 static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, unsigned char *buf );
31 static int gdrom_image_drive_status( gdrom_disc_t disc );
33 struct cdrom_sector_header {
34 uint8_t sync[12];
35 uint8_t msf[3];
36 uint8_t mode;
37 };
39 /**
40 * Initialize a gdrom_disc structure with the gdrom_image_* methods
41 */
42 void gdrom_image_init( gdrom_disc_t disc )
43 {
44 memset( disc, 0, sizeof(struct gdrom_disc) ); /* safety */
45 disc->read_sector = gdrom_image_read_sector;
46 disc->read_toc = gdrom_image_read_toc;
47 disc->read_session = gdrom_image_read_session;
48 disc->read_position = gdrom_image_read_position;
49 disc->drive_status = gdrom_image_drive_status;
50 disc->play_audio = NULL; /* not supported yet */
51 disc->run_time_slice = NULL; /* not needed */
52 disc->close = gdrom_image_destroy;
53 }
55 gdrom_disc_t gdrom_image_new( const gchar *filename, FILE *f )
56 {
57 gdrom_image_t image = (gdrom_image_t)calloc(sizeof(struct gdrom_image), 1);
58 if( image == NULL ) {
59 return NULL;
60 }
61 image->disc_type = IDE_DISC_CDROM;
62 image->file = f;
63 gdrom_disc_t disc = (gdrom_disc_t)image;
64 gdrom_image_init(disc);
65 if( filename == NULL ) {
66 disc->name = NULL;
67 } else {
68 disc->name = g_strdup(filename);
69 }
71 return disc;
72 }
74 static void gdrom_image_destroy( gdrom_disc_t disc )
75 {
76 int i;
77 FILE *lastfile = NULL;
78 gdrom_image_t img = (gdrom_image_t)disc;
79 if( img->file != NULL ) {
80 fclose(img->file);
81 img->file = NULL;
82 }
83 for( i=0; i<img->track_count; i++ ) {
84 if( img->track[i].file != NULL && img->track[i].file != lastfile ) {
85 lastfile = img->track[i].file;
86 fclose(lastfile);
87 img->track[i].file = NULL;
88 }
89 }
90 if( disc->name != NULL ) {
91 g_free( (gpointer)disc->name );
92 disc->name = NULL;
93 }
94 free( disc );
95 }
97 void gdrom_image_destroy_no_close( gdrom_disc_t disc )
98 {
99 int i;
100 FILE *lastfile = NULL;
101 gdrom_image_t img = (gdrom_image_t)disc;
102 if( img->file != NULL ) {
103 img->file = NULL;
104 }
105 for( i=0; i<img->track_count; i++ ) {
106 if( img->track[i].file != NULL && img->track[i].file != lastfile ) {
107 lastfile = img->track[i].file;
108 fclose(lastfile);
109 img->track[i].file = NULL;
110 }
111 }
112 if( disc->name != NULL ) {
113 g_free( (gpointer)disc->name );
114 disc->name = NULL;
115 }
116 free( disc );
117 }
119 static int gdrom_image_get_track_by_lba( gdrom_image_t image, uint32_t lba )
120 {
121 int i;
122 for( i=0; i<image->track_count; i++ ) {
123 if( image->track[i].lba <= lba &&
124 lba < (image->track[i].lba + image->track[i].sector_count) ) {
125 return i+1;
126 }
127 }
128 return -1;
129 }
131 /**
132 * Read a block from an image file, handling negative file offsets
133 * with 0-fill.
134 */
135 static void gdrom_read_block( unsigned char *buf, int file_offset, int length, FILE *f )
136 {
137 if( file_offset < 0 ) {
138 int size = -file_offset;
139 if( size >= length ) {
140 memset( buf, 0, length );
141 return;
142 } else {
143 memset( buf, 0, size );
144 file_offset = 0;
145 length -= size;
146 }
147 }
148 fseek( f, file_offset, SEEK_SET );
149 fread( buf, length, 1, f );
150 }
152 static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba,
153 int mode, unsigned char *buf, uint32_t *length )
154 {
155 gdrom_image_t image = (gdrom_image_t)disc;
156 struct cdrom_sector_header secthead;
157 int file_offset, read_len, track_no;
159 FILE *f;
161 track_no = gdrom_image_get_track_by_lba( image, lba );
162 if( track_no == -1 ) {
163 return PKT_ERR_BADREAD;
164 }
165 struct gdrom_track *track = &image->track[track_no-1];
166 file_offset = track->offset + track->sector_size * (lba - track->lba);
167 read_len = track->sector_size;
168 if( track->file != NULL ) {
169 f = track->file;
170 } else {
171 f = image->file;
172 }
176 switch( mode ) {
177 case 0x24:
178 case 0x28:
179 read_len = 2048;
180 switch( track->mode ) {
181 case GDROM_MODE1:
182 case GDROM_MODE2_XA1:
183 gdrom_read_block( buf, file_offset, track->sector_size, f );
184 break;
185 case GDROM_MODE2:
186 file_offset += 8; /* skip the subheader */
187 gdrom_read_block( buf, file_offset, 2048, f );
188 break;
189 case GDROM_RAW:
190 gdrom_read_block( (unsigned char *)(§head), file_offset, sizeof(secthead), f );
191 switch( secthead.mode ) {
192 case 1:
193 file_offset += 16;
194 break;
195 case 2:
196 file_offset += 24;
197 break;
198 default:
199 return PKT_ERR_BADREADMODE;
200 }
201 gdrom_read_block( buf, file_offset, 2048, f );
202 break;
203 default:
204 return PKT_ERR_BADREADMODE;
205 }
206 break;
207 default:
208 return PKT_ERR_BADREADMODE;
209 }
211 *length = read_len;
212 return PKT_ERR_OK;
214 }
216 static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, unsigned char *buf )
217 {
218 gdrom_image_t image = (gdrom_image_t)disc;
219 struct gdrom_toc *toc = (struct gdrom_toc *)buf;
220 int i;
222 for( i=0; i<image->track_count; i++ ) {
223 toc->track[i] = htonl( image->track[i].lba ) | image->track[i].flags;
224 }
225 toc->first = 0x0100 | image->track[0].flags;
226 toc->last = (image->track_count<<8) | image->track[i-1].flags;
227 toc->leadout = htonl(image->track[i-1].lba + image->track[i-1].sector_count) |
228 image->track[i-1].flags;
229 for( ;i<99; i++ )
230 toc->track[i] = 0xFFFFFFFF;
231 return PKT_ERR_OK;
232 }
234 static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, unsigned char *buf )
235 {
236 gdrom_image_t image = (gdrom_image_t)disc;
237 struct gdrom_track *last_track = &image->track[image->track_count-1];
238 unsigned int end_of_disc = last_track->lba + last_track->sector_count;
239 int i;
240 buf[0] = 0x01; /* Disc status? */
241 buf[1] = 0;
243 if( session == 0 ) {
244 buf[2] = last_track->session+1; /* last session */
245 buf[3] = (end_of_disc >> 16) & 0xFF;
246 buf[4] = (end_of_disc >> 8) & 0xFF;
247 buf[5] = end_of_disc & 0xFF;
248 return PKT_ERR_OK;
249 } else {
250 session--;
251 for( i=0; i<image->track_count; i++ ) {
252 if( image->track[i].session == session ) {
253 buf[2] = i+1; /* first track of session */
254 buf[3] = (image->track[i].lba >> 16) & 0xFF;
255 buf[4] = (image->track[i].lba >> 8) & 0xFF;
256 buf[5] = image->track[i].lba & 0xFF;
257 return PKT_ERR_OK;
258 }
259 }
260 return PKT_ERR_BADFIELD; /* No such session */
261 }
262 }
264 static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, unsigned char *buf )
265 {
266 gdrom_image_t image = (gdrom_image_t)disc;
267 int track_no = gdrom_image_get_track_by_lba( image, lba );
268 if( track_no == -1 ) {
269 track_no = 1;
270 lba = 150;
271 }
272 struct gdrom_track *track = &image->track[track_no-1];
273 uint32_t offset = lba - track->lba;
274 buf[4] = track->flags;
275 buf[5] = track_no;
276 buf[6] = 0x01; /* ?? */
277 buf[7] = (offset >> 16) & 0xFF;
278 buf[8] = (offset >> 8) & 0xFF;
279 buf[9] = offset & 0xFF;
280 buf[10] = 0;
281 buf[11] = (lba >> 16) & 0xFF;
282 buf[12] = (lba >> 8) & 0xFF;
283 buf[13] = lba & 0xFF;
284 return PKT_ERR_OK;
285 }
287 static int gdrom_image_drive_status( gdrom_disc_t disc )
288 {
289 gdrom_image_t image = (gdrom_image_t)disc;
290 return image->disc_type | IDE_DISC_READY;
291 }
293 void gdrom_image_dump_info( gdrom_disc_t d ) {
294 gdrom_image_t disc = (gdrom_image_t)d;
295 int i;
296 int last_session = disc->track[disc->track_count-1].session;
297 gboolean is_bootable = FALSE;
299 INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count,
300 disc->track[disc->track_count-1].session + 1 );
301 if( last_session > 0 ) {
302 /* Boot track is the first data track of the last session, provided that it
303 * cannot be a single-session disc.
304 */
305 int boot_track = -1;
306 for( i=disc->track_count-1; i>=0 && disc->track[i].session == last_session; i-- ) {
307 if( disc->track[i].flags & TRACK_DATA ) {
308 boot_track = i;
309 }
310 }
311 if( boot_track != -1 ) {
312 unsigned char boot_sector[MAX_SECTOR_SIZE];
313 uint32_t length = sizeof(boot_sector);
314 if( d->read_sector( d, disc->track[boot_track].lba, 0x28,
315 boot_sector, &length ) == PKT_ERR_OK ) {
316 bootstrap_dump(boot_sector, FALSE);
317 is_bootable = TRUE;
318 }
319 }
320 }
321 if( !is_bootable ) {
322 WARN( "Disc does not appear to be bootable" );
323 }
324 }
.