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 #ifdef HAVE_HOTSWAP
  27 #include "dir.h" /* for release_dirs() */
  28 #include "file.h" /* for release_files() */
  29 #endif
  30 #include "disk.h"
  31 #include <string.h>
  32
  33 /* Partition table entry layout:
  34    -----------------------
  35    0: 0x80 - active
  36    1: starting head
  37    2: starting sector
  38    3: starting cylinder
  39    4: partition type
  40    5: end head
  41    6: end sector
  42    7: end cylinder
  43    8-11: starting sector (LBA)
  44    12-15: nr of sectors in partition
  45 */
  46
  47 #define BYTES2INT32(array,pos)                  \
  48     ((long)array[pos] | ((long)array[pos+1] << 8 ) |        \
  49      ((long)array[pos+2] << 16 ) | ((long)array[pos+3] << 24 ))
  50
  51 static const unsigned char fat_partition_types[] = {
  52     0x0b, 0x1b, /* FAT32 + hidden variant */
  53     0x0c, 0x1c, /* FAT32 (LBA) + hidden variant */
  54 #ifdef HAVE_FAT16SUPPORT
  55     0x04, 0x14, /* FAT16 <= 32MB + hidden variant */
  56     0x06, 0x16, /* FAT16  > 32MB + hidden variant */
  57     0x0e, 0x1e, /* FAT16 (LBA) + hidden variant */
  58 #endif
  59 };
  60
  61 static struct partinfo part[NUM_DRIVES*4]; /* space for 4 partitions on 2 drives */
  62 static int vol_drive[NUM_VOLUMES]; /* mounted to which drive (-1 if none) */
  63 static struct mutex disk_mutex;
  64
  65 #ifdef MAX_LOG_SECTOR_SIZE
  66 int disk_sector_multiplier = 1;
  67 #endif
  68
  69 static struct partinfo* disk_init(IF_MD_NONVOID(int drive))
  70 {
  71     int i;
  72     unsigned char sector[SECTOR_SIZE];
  73 #ifdef HAVE_MULTIDRIVE
  74     /* For each drive, start at a different position, in order not to destroy
  75        the first entry of drive 0.
  76        That one is needed to calculate config sector position. */
  77     struct partinfo* pinfo = &part[drive*4];
  78     if ((size_t)drive >= sizeof(part)/sizeof(*part)/4)
  79         return NULL; /* out of space in table */
  80 #else
  81     struct partinfo* pinfo = part;
  82     const int drive = 0;
  83     (void)drive;
  84 #endif
  85
  86     storage_read_sectors(IF_MD2(drive,) 0,1, sector);
  87     /* check that the boot sector is initialized */
  88     if ( (sector[510] != 0x55) ||
  89          (sector[511] != 0xaa)) {
  90         DEBUGF("Bad boot sector signature\n");
  91         return NULL;
  92     }
  93
  94     /* parse partitions */
  95     for ( i=0; i<4; i++ ) {
  96         unsigned char* ptr = sector + 0x1be + 16*i;
  97         pinfo[i].type  = ptr[4];
  98         pinfo[i].start = BYTES2INT32(ptr, 8);
  99         pinfo[i].size  = BYTES2INT32(ptr, 12);
 100
 101         DEBUGF("Part%d: Type %02x, start: %08lx size: %08lx\n",
 102                i,pinfo[i].type,pinfo[i].start,pinfo[i].size);
 103
 104         /* extended? */
 105         if ( pinfo[i].type == 5 ) {
 106             /* not handled yet */
 107         }
 108     }
 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             mounted = 1;
 229             vol_drive[volume] = drive; /* remember the drive for this volume */
 230         }
 231     }
 232 #ifdef HAVE_HOTSWAP
 233     mutex_unlock(&disk_mutex);
 234 #endif
 235     return mounted;
 236 }
 237
 238 #ifdef HAVE_HOTSWAP
 239 int disk_unmount(int drive)
 240 {
 241     int unmounted = 0;
 242     int i;
 243     mutex_lock(&disk_mutex);
 244     for (i=0; i<NUM_VOLUMES; i++)
 245     {
 246         if (vol_drive[i] == drive)
 247         {   /* force releasing resources */
 248             vol_drive[i] = -1; /* mark unused */
 249             unmounted++;
 250             release_files(i);
 251             release_dirs(i);
 252             fat_unmount(i, false);
 253         }
 254     }
 255     mutex_unlock(&disk_mutex);
 256
 257     return unmounted;
 258 }
 259 #endif /* #ifdef HAVE_HOTSWAP */