firmware/common/disk.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Björn Stenberg
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #include <stdio.h>
  22 #include "kernel.h"
  23 #include "storage.h"
  24 #include "debug.h"
  25 #include "fat.h"
  26 #include "dir.h" /* for release_dirs() */
  27 #include "file.h" /* for release_files() */
  28 #include "disk.h"
  29 #include <string.h>
  30
  31 /* Partition table entry layout:
  32    -----------------------
  33    0: 0x80 - active
  34    1: starting head
  35    2: starting sector
  36    3: starting cylinder
  37    4: partition type
  38    5: end head
  39    6: end sector
  40    7: end cylinder
  41    8-11: starting sector (LBA)
  42    12-15: nr of sectors in partition
  43 */
  44
  45 #define BYTES2INT32(array,pos)                  \
  46     ((long)array[pos] | ((long)array[pos+1] << 8 ) |        \
  47      ((long)array[pos+2] << 16 ) | ((long)array[pos+3] << 24 ))
  48
  49 static const unsigned char fat_partition_types[] = {
  50     0x0b, 0x1b, /* FAT32 + hidden variant */
  51     0x0c, 0x1c, /* FAT32 (LBA) + hidden variant */
  52 #ifdef HAVE_FAT16SUPPORT
  53     0x04, 0x14, /* FAT16 <= 32MB + hidden variant */
  54     0x06, 0x16, /* FAT16  > 32MB + hidden variant */
  55     0x0e, 0x1e, /* FAT16 (LBA) + hidden variant */
  56 #endif
  57 };
  58
  59 static struct partinfo part[NUM_DRIVES*4]; /* space for 4 partitions on 2 drives */
  60 static int vol_drive[NUM_VOLUMES]; /* mounted to which drive (-1 if none) */
  61 static struct mutex disk_mutex;
  62
  63 #ifdef MAX_LOG_SECTOR_SIZE
  64 int disk_sector_multiplier = 1;
  65 #endif
  66
  67 struct partinfo* disk_init(IF_MD_NONVOID(int drive))
  68 {
  69     int i;
  70 #ifdef HAVE_MULTIDRIVE
  71     /* For each drive, start at a different position, in order not to destroy
  72        the first entry of drive 0.
  73        That one is needed to calculate config sector position. */
  74     struct partinfo* pinfo = &part[drive*4];
  75     if ((size_t)drive >= sizeof(part)/sizeof(*part)/4)
  76         return NULL; /* out of space in table */
  77 #else
  78     struct partinfo* pinfo = part;
  79     const int drive = 0;
  80     (void)drive;
  81 #endif
  82
  83     unsigned char* sector = fat_get_sector_buffer();
  84     storage_read_sectors(IF_MD2(drive,) 0,1, sector);
  85     /* check that the boot sector is initialized */
  86     if ( (sector[510] != 0x55) ||
  87          (sector[511] != 0xaa)) {
  88         fat_release_sector_buffer();
  89         DEBUGF("Bad boot sector signature\n");
  90         return NULL;
  91     }
  92
  93     /* parse partitions */
  94     for ( i=0; i<4; i++ ) {
  95         unsigned char* ptr = sector + 0x1be + 16*i;
  96         pinfo[i].type  = ptr[4];
  97         pinfo[i].start = BYTES2INT32(ptr, 8);
  98         pinfo[i].size  = BYTES2INT32(ptr, 12);
  99
 100         DEBUGF("Part%d: Type %02x, start: %08lx size: %08lx\n",
 101                i,pinfo[i].type,pinfo[i].start,pinfo[i].size);
 102
 103         /* extended? */
 104         if ( pinfo[i].type == 5 ) {
 105             /* not handled yet */
 106         }
 107     }
 108     fat_release_sector_buffer();
 109     return pinfo;
 110 }
 111
 112 struct partinfo* disk_partinfo(int partition)
 113 {
 114     return &part[partition];
 115 }
 116
 117 void disk_init_subsystem(void)
 118 {
 119    mutex_init(&disk_mutex);
 120 }
 121
 122 int disk_mount_all(void)
 123 {
 124     int mounted=0;
 125     int i;
 126
 127 #ifdef HAVE_HOTSWAP
 128     mutex_lock(&disk_mutex);
 129 #endif
 130
 131     fat_init(); /* reset all mounted partitions */
 132     for (i=0; i<NUM_VOLUMES; i++)
 133         vol_drive[i] = -1; /* mark all as unassigned */
 134
 135 #ifndef HAVE_MULTIDRIVE
 136     mounted = disk_mount(0);
 137 #else
 138     for(i=0;i<NUM_DRIVES;i++)
 139     {
 140 #ifdef HAVE_HOTSWAP
 141         if (storage_present(i))
 142 #endif
 143             mounted += disk_mount(i);
 144     }
 145 #endif
 146
 147 #ifdef HAVE_HOTSWAP
 148     mutex_unlock(&disk_mutex);
 149 #endif
 150     return mounted;
 151 }
 152
 153 static int get_free_volume(void)
 154 {
 155     int i;
 156     for (i=0; i<NUM_VOLUMES; i++)
 157     {
 158         if (vol_drive[i] == -1) /* unassigned? */
 159             return i;
 160     }
 161
 162     return -1; /* none found */
 163 }
 164
 165 int disk_mount(int drive)
 166 {
 167     int mounted = 0; /* reset partition-on-drive flag */
 168     int volume;
 169     struct partinfo* pinfo;
 170
 171 #ifdef HAVE_HOTSWAP
 172     mutex_lock(&disk_mutex);
 173 #endif
 174
 175     volume = get_free_volume();
 176     pinfo = disk_init(IF_MD(drive));
 177
 178     if (pinfo == NULL)
 179     {
 180 #ifdef HAVE_HOTSWAP
 181         mutex_unlock(&disk_mutex);
 182 #endif
 183         return 0;
 184     }
 185 #if defined(TOSHIBA_GIGABEAT_S)
 186     int i = 1;  /* For the Gigabeat S, we mount the second partition */
 187 #else
 188     int i = 0;
 189 #endif
 190     for (; volume != -1 && i<4 && mounted<NUM_VOLUMES_PER_DRIVE; i++)
 191     {
 192         if (memchr(fat_partition_types, pinfo[i].type,
 193                    sizeof(fat_partition_types)) == NULL)
 194             continue;  /* not an accepted partition type */
 195
 196 #ifdef MAX_LOG_SECTOR_SIZE
 197         int j;
 198
 199         for (j = 1; j <= (MAX_LOG_SECTOR_SIZE/SECTOR_SIZE); j <<= 1)
 200         {
 201             if (!fat_mount(IF_MV2(volume,) IF_MD2(drive,) pinfo[i].start * j))
 202             {
 203                 pinfo[i].start *= j;
 204                 pinfo[i].size *= j;
 205                 mounted++;
 206                 vol_drive[volume] = drive; /* remember the drive for this volume */
 207                 volume = get_free_volume(); /* prepare next entry */
 208                 if (drive == 0)
 209                     disk_sector_multiplier = j;
 210                 break;
 211             }
 212         }
 213 #else
 214         if (!fat_mount(IF_MV2(volume,) IF_MD2(drive,) pinfo[i].start))
 215         {
 216             mounted++;
 217             vol_drive[volume] = drive; /* remember the drive for this volume */
 218             volume = get_free_volume(); /* prepare next entry */
 219         }
 220 #endif
 221     }
 222
 223     if (mounted == 0 && volume != -1) /* none of the 4 entries worked? */
 224     {   /* try "superfloppy" mode */
 225         DEBUGF("No partition found, trying to mount sector 0.\n");
 226         if (!fat_mount(IF_MV2(volume,) IF_MD2(drive,) 0))
 227         {
 228 #ifdef MAX_LOG_SECTOR_SIZE
 229             disk_sector_multiplier = fat_get_bytes_per_sector(IF_MV(volume))/SECTOR_SIZE;
 230 #endif
 231             mounted = 1;
 232             vol_drive[volume] = drive; /* remember the drive for this volume */
 233         }
 234     }
 235 #ifdef HAVE_HOTSWAP
 236     mutex_unlock(&disk_mutex);
 237 #endif
 238     return mounted;
 239 }
 240
 241 int disk_unmount(int drive)
 242 {
 243     int unmounted = 0;
 244     int i;
 245 #ifdef HAVE_HOTSWAP
 246     mutex_lock(&disk_mutex);
 247 #endif
 248     for (i=0; i<NUM_VOLUMES; i++)
 249     {
 250         if (vol_drive[i] == drive)
 251         {   /* force releasing resources */
 252             vol_drive[i] = -1; /* mark unused */
 253             unmounted++;
 254             release_files(i);
 255             release_dirs(i);
 256             fat_unmount(i, false);
 257         }
 258     }
 259 #ifdef HAVE_HOTSWAP
 260     mutex_unlock(&disk_mutex);
 261 #endif
 262
 263     return unmounted;
 264 }
 265
 266 int disk_unmount_all(void)
 267 {
 268 #ifndef HAVE_MULTIDRIVE
 269     return disk_unmount(0);
 270 #else  /* HAVE_MULTIDRIVE */
 271     int unmounted = 0;
 272     int i;
 273     for (i = 0; i < NUM_DRIVES; i++)
 274     {
 275 #ifdef HAVE_HOTSWAP
 276         if (storage_present(i))
 277 #endif
 278             unmounted += disk_unmount(i);
 279     }
 280
 281     return unmounted;
 282 #endif  /* HAVE_MULTIDRIVE */
 283 }