filename | src/gdrom/linux.c |
changeset | 353:b8569afb53fc |
prev | 342:850502f0e8de |
next | 422:61a0598e07ff |
author | nkeynes |
date | Tue Sep 04 08:32:10 2007 +0000 (16 years ago) |
permissions | -rw-r--r-- |
last change | Change sh4x86 test to translate/disasm full basic blocks Add prelim sym-tab support |
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1 /**
2 * $Id: linux.c,v 1.4 2007-02-11 10:11:05 nkeynes Exp $
3 *
4 * Linux cd-rom device driver.
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 #include <stdlib.h>
19 #include <stdio.h>
20 #include <string.h>
21 #include <errno.h>
22 #include <linux/cdrom.h>
23 #include <sys/stat.h>
24 #include <sys/ioctl.h>
26 #include "gdrom/gdrom.h"
27 #include "gdrom/packet.h"
28 #include "dream.h"
30 #define MAXTOCENTRIES 600 /* This is a fairly generous overestimate really */
31 #define MAXTOCSIZE 4 + (MAXTOCENTRIES*11)
32 #define MAX_SECTORS_PER_CALL 1
34 #define MSFTOLBA( m,s,f ) (f + (s*CD_FRAMES) + (m*CD_FRAMES*CD_SECS))
36 static uint32_t inline lbatomsf( uint32_t lba ) {
37 union cdrom_addr addr;
38 lba = lba + CD_MSF_OFFSET;
39 addr.msf.frame = lba % CD_FRAMES;
40 int seconds = lba / CD_FRAMES;
41 addr.msf.second = seconds % CD_SECS;
42 addr.msf.minute = seconds / CD_SECS;
43 return addr.lba;
44 }
46 #define LBATOMSF( lba ) lbatomsf(lba)
49 static gboolean linux_image_is_valid( FILE *f );
50 static gdrom_disc_t linux_open_device( const gchar *filename, FILE *f );
51 static gdrom_error_t linux_read_disc_toc( gdrom_image_t disc );
52 static gdrom_error_t linux_read_sector( gdrom_disc_t disc, uint32_t sector,
53 int mode, char *buf, uint32_t *length );
54 static gdrom_error_t linux_send_command( int fd, char *cmd, char *buffer, size_t *buflen,
55 int direction );
56 static int linux_drive_status( gdrom_disc_t disc );
58 struct gdrom_image_class linux_device_class = { "Linux", NULL,
59 linux_image_is_valid, linux_open_device };
61 static gboolean linux_image_is_valid( FILE *f )
62 {
63 struct stat st;
64 struct cdrom_tochdr tochdr;
66 if( fstat(fileno(f), &st) == -1 ) {
67 return FALSE; /* can't stat device? */
68 }
69 if( !S_ISBLK(st.st_mode) ) {
70 return FALSE; /* Not a block device */
71 }
73 if( ioctl(fileno(f), CDROMREADTOCHDR, &tochdr) == -1 ) {
74 /* Quick check that this is really a CD */
75 return FALSE;
76 }
78 return TRUE;
79 }
81 static gdrom_disc_t linux_open_device( const gchar *filename, FILE *f )
82 {
83 gdrom_disc_t disc;
84 int fd = fileno(f);
86 disc = gdrom_image_new(f);
87 if( disc == NULL ) {
88 ERROR("Unable to allocate memory!");
89 return NULL;
90 }
92 gdrom_error_t status = linux_read_disc_toc( (gdrom_image_t)disc );
93 if( status != 0 ) {
94 disc->close(disc);
95 if( status == 0xFFFF ) {
96 ERROR("Unable to load disc table of contents (%s)", strerror(errno));
97 } else {
98 ERROR("Unable to load disc table of contents (sense %d,%d)",
99 status &0xFF, status >> 8 );
100 }
101 return NULL;
102 }
103 disc->read_sector = linux_read_sector;
104 disc->drive_status = linux_drive_status;
105 ((gdrom_image_t)disc)->disc_type = IDE_DISC_CDROM;
106 return disc;
107 }
109 static int linux_drive_status( gdrom_disc_t disc )
110 {
111 int fd = fileno(((gdrom_image_t)disc)->file);
112 int status = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
113 if( status == CDS_DISC_OK ) {
114 status = ioctl(fd, CDROM_MEDIA_CHANGED, CDSL_CURRENT);
115 if( status != 0 ) {
116 linux_read_disc_toc(disc);
117 }
118 return ((gdrom_image_t)disc)->disc_type | IDE_DISC_READY;
119 } else {
120 return IDE_DISC_NONE;
121 }
122 }
123 /**
124 * Read the full table of contents into the disc from the device.
125 */
126 static gdrom_error_t linux_read_disc_toc( gdrom_image_t disc )
127 {
128 int fd = fileno(disc->file);
129 unsigned char buf[MAXTOCSIZE];
130 int buflen = sizeof(buf);
131 char cmd[12] = { 0x43, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
133 cmd[7] = (sizeof(buf))>>8;
134 cmd[8] = (sizeof(buf))&0xFF;
135 memset( buf, 0, sizeof(buf) );
136 gdrom_error_t status = linux_send_command( fd, cmd, buf, &buflen, CGC_DATA_READ );
137 if( status != 0 ) {
138 return status;
139 }
141 int max_track = 0;
142 int last_track = -1;
143 int leadout = -1;
144 int len = (buf[0] << 8) | buf[1];
145 int session_type = GDROM_MODE1;
146 int i;
147 for( i = 4; i<len; i+=11 ) {
148 int session = buf[i];
149 int adr = buf[i+1] >> 4;
150 int point = buf[i+3];
151 if( adr == 0x01 && point > 0 && point < 100 ) {
152 /* Track info */
153 int trackno = point-1;
154 if( point > max_track ) {
155 max_track = point;
156 }
157 disc->track[trackno].flags = (buf[i+1] & 0x0F) << 4;
158 disc->track[trackno].session = session - 1;
159 disc->track[trackno].lba = MSFTOLBA(buf[i+8],buf[i+9],buf[i+10]);
160 if( disc->track[trackno].flags & TRACK_DATA ) {
161 disc->track[trackno].mode = GDROM_MODE1;
162 } else {
163 disc->track[trackno].mode = GDROM_CDDA;
164 }
165 if( last_track != -1 ) {
166 disc->track[last_track].sector_count = disc->track[trackno].lba -
167 disc->track[last_track].lba;
168 }
169 last_track = trackno;
170 } else switch( (adr << 8) | point ) {
171 case 0x1A0: /* session info */
172 if( buf[i+9] == 0x20 ) {
173 session_type = GDROM_MODE2;
174 } else {
175 session_type = GDROM_MODE1;
176 }
177 case 0x1A2: /* leadout */
178 leadout = MSFTOLBA(buf[i+8], buf[i+9], buf[i+10]);
179 break;
180 }
181 }
182 disc->track_count = max_track;
184 if( leadout != -1 && last_track != -1 ) {
185 disc->track[last_track].sector_count = leadout - disc->track[last_track].lba;
186 }
187 return 0;
188 }
190 static gdrom_error_t linux_read_sector( gdrom_disc_t disc, uint32_t sector,
191 int mode, char *buf, uint32_t *length )
192 {
193 gdrom_image_t image = (gdrom_image_t)disc;
194 int fd = fileno(image->file);
195 uint32_t real_sector = sector - CD_MSF_OFFSET;
196 uint32_t sector_size = MAX_SECTOR_SIZE;
197 int i;
198 char cmd[12] = { 0xBE, 0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
200 cmd[1] = (mode & 0x0E) << 1;
201 cmd[2] = (real_sector >> 24) & 0xFF;
202 cmd[3] = (real_sector >> 16) & 0xFF;
203 cmd[4] = (real_sector >> 8) & 0xFF;
204 cmd[5] = real_sector & 0xFF;
205 cmd[6] = 0;
206 cmd[7] = 0;
207 cmd[8] = 1;
208 cmd[9] = 0x10;
210 gdrom_error_t status = linux_send_command( fd, cmd, buf, §or_size, CGC_DATA_READ );
211 if( status != 0 ) {
212 return status;
213 }
214 *length = 2048;
215 return 0;
216 }
218 /**
219 * Send a packet command to the device and wait for a response.
220 * @return 0 on success, -1 on an operating system error, or a sense error
221 * code on a device error.
222 */
223 static gdrom_error_t linux_send_command( int fd, char *cmd, char *buffer, size_t *buflen,
224 int direction )
225 {
226 struct request_sense sense;
227 struct cdrom_generic_command cgc;
229 memset( &cgc, 0, sizeof(cgc) );
230 memset( &sense, 0, sizeof(sense) );
231 memcpy( cgc.cmd, cmd, 12 );
232 cgc.buffer = buffer;
233 cgc.buflen = *buflen;
234 cgc.sense = &sense;
235 cgc.data_direction = direction;
237 if( ioctl(fd, CDROM_SEND_PACKET, &cgc) == -1 ) {
238 if( sense.sense_key == 0 ) {
239 return -1;
240 } else {
241 /* TODO: Map newer codes back to the ones used by the gd-rom. */
242 return sense.sense_key | (sense.asc<<8);
243 }
244 } else {
245 *buflen = cgc.buflen;
246 return 0;
247 }
248 }
.