lxdream 0.9.1| filename | src/gdrom/gdrom.c |
| changeset | 149:d88dd2e9a190 |
| prev | 143:9446fb6df0c5 |
| next | 152:d42a4c5cc709 |
| author | nkeynes |
| date | Tue May 23 13:10:28 2006 +0000 (17 years ago) |
| permissions | -rw-r--r-- |
| last change | Add texcache invalidates on direct writes to 64-bit vram. Technically we should do it on direct writes to 32-bit vram as well, but noone (sane) is going to try to write a texture there... |
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1 /**
2 * $Id: gdrom.c,v 1.4 2006-05-20 06:24:49 nkeynes Exp $
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>
21 #include "gdrom/ide.h"
22 #include "gdrom/gdrom.h"
23 #include "gdrom/packet.h"
24 #include "dream.h"
26 static void gdrom_image_destroy( gdrom_disc_t );
27 static uint32_t gdrom_image_read_sectors( gdrom_disc_t, uint32_t, uint32_t, int, char *, uint32_t * );
30 gdrom_disc_t gdrom_disc = NULL;
32 char *gdrom_mode_names[] = { "Mode1", "Mode2", "XA 1", "XA2", "Audio", "GD-Rom" };
33 uint32_t gdrom_sector_size[] = { 2048, 2336, 2048, 2324, 2352, 2336 };
35 gdrom_disc_t gdrom_image_open( const gchar *filename )
36 {
37 return nrg_image_open( filename );
38 }
41 gdrom_disc_t gdrom_image_new( FILE *file )
42 {
43 struct gdrom_disc *disc = (struct gdrom_disc *)calloc(1, sizeof(struct gdrom_disc));
44 if( disc == NULL )
45 return NULL;
46 disc->read_sectors = gdrom_image_read_sectors;
47 disc->close = gdrom_image_destroy;
48 disc->disc_type = IDE_DISC_CDROM;
49 disc->file = file;
50 return disc;
51 }
53 static void gdrom_image_destroy( gdrom_disc_t disc )
54 {
55 if( disc->file != NULL ) {
56 fclose(disc->file);
57 disc->file = NULL;
58 }
59 free( disc );
60 }
62 static uint32_t gdrom_image_read_sectors( gdrom_disc_t disc, uint32_t sector,
63 uint32_t sector_count, int mode, char *buf,
64 uint32_t *length )
65 {
66 int i, track = -1, track_offset, read_len;
68 for( i=0; i<disc->track_count; i++ ) {
69 if( disc->track[i].lba <= sector &&
70 (sector + sector_count) <= (disc->track[i].lba + disc->track[i].sector_count) ) {
71 track = i;
72 break;
73 }
74 }
75 if( track == -1 )
76 return PKT_ERR_BADREAD;
77 if( mode == GDROM_GD && disc->track[i].mode != GDROM_GD )
78 return PKT_ERR_BADREADMODE;
80 track_offset = disc->track[track].sector_size * (sector - disc->track[track].lba);
81 read_len = disc->track[track].sector_size * sector_count;
82 fseek( disc->file, disc->track[track].offset + track_offset, SEEK_SET );
83 fread( buf, disc->track[track].sector_size, sector_count, disc->file );
84 *length = read_len;
85 return PKT_ERR_OK;
86 }
88 uint32_t gdrom_read_sectors( uint32_t sector, uint32_t sector_count,
89 int mode, char *buf, uint32_t *length )
90 {
91 if( gdrom_disc == NULL )
92 return PKT_ERR_NODISC; /* No media */
93 return gdrom_disc->read_sectors( gdrom_disc, sector, sector_count, mode, buf, length );
94 }
97 void gdrom_dump_disc( gdrom_disc_t disc ) {
98 int i;
99 INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count,
100 disc->track[disc->track_count-1].session + 1 );
101 for( i=0; i<disc->track_count; i++ ) {
102 INFO( "Sess %d Trk %d: Start %06X Length %06X, %s",
103 disc->track[i].session+1, i+1, disc->track[i].lba,
104 disc->track[i].sector_count, gdrom_mode_names[disc->track[i].mode] );
105 }
106 }
108 gdrom_error_t gdrom_get_toc( char *buf )
109 {
110 struct gdrom_toc *toc = (struct gdrom_toc *)buf;
111 int i;
113 if( gdrom_disc == NULL )
114 return PKT_ERR_NODISC;
116 for( i=0; i<gdrom_disc->track_count; i++ ) {
117 toc->track[i] = htonl( gdrom_disc->track[i].lba ) | gdrom_disc->track[i].flags;
118 }
119 toc->first = 0x0100 | gdrom_disc->track[0].flags;
120 toc->last = (gdrom_disc->track_count<<8) | gdrom_disc->track[i-1].flags;
121 toc->leadout = htonl(gdrom_disc->track[i-1].lba + gdrom_disc->track[i-1].sector_count) |
122 gdrom_disc->track[i-1].flags;
123 for( ;i<99; i++ )
124 toc->track[i] = 0xFFFFFFFF;
125 return PKT_ERR_OK;
126 }
128 gdrom_error_t gdrom_get_info( char *buf )
129 {
130 if( gdrom_disc == NULL )
131 return PKT_ERR_NODISC;
132 struct gdrom_track *last_track = &gdrom_disc->track[gdrom_disc->track_count-1];
133 unsigned int end_of_disc = last_track->lba + last_track->sector_count;
135 buf[0] = 0x01; /* Unknown. First session? */
136 buf[1] = 0;
137 buf[2] = last_track->session+1; /* last session */
138 buf[3] = (end_of_disc >> 16) & 0xFF;
139 buf[4] = (end_of_disc >> 8) & 0xFF;
140 buf[5] = end_of_disc & 0xFF;
141 return PKT_ERR_OK;
142 }
144 void gdrom_mount_disc( gdrom_disc_t disc )
145 {
146 gdrom_unmount_disc();
147 gdrom_disc = disc;
148 idereg.disc = disc->disc_type | IDE_DISC_READY;
149 gdrom_dump_disc( disc );
150 }
152 gdrom_disc_t gdrom_mount_image( const gchar *filename )
153 {
154 gdrom_disc_t disc = gdrom_image_open(filename);
155 if( disc != NULL )
156 gdrom_mount_disc( disc );
157 return disc;
158 }
160 void gdrom_unmount_disc( )
161 {
162 if( gdrom_disc != NULL ) {
163 gdrom_disc->close(gdrom_disc);
164 }
165 gdrom_disc = NULL;
166 idereg.disc = IDE_DISC_NONE;
167 }
169 gboolean gdrom_is_mounted( void )
170 {
171 return gdrom_disc != NULL;
172 }
.