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  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19 #include <stdio.h>
  20 #include "ata.h"
  21 #include "debug.h"
  22 #include "fat.h"
  23 #ifdef HAVE_HOTSWAP
  24 #include "hotswap.h"
  25 #include "dir.h" /* for release_dirs() */
  26 #include "file.h" /* for release_files() */
  27 #endif
  28 #include "disk.h"
  29
  30 /* Partition table entry layout:
  31    -----------------------
  32    0: 0x80 - active
  33    1: starting head
  34    2: starting sector
  35    3: starting cylinder
  36    4: partition type
  37    5: end head
  38    6: end sector
  39    7: end cylinder
  40    8-11: starting sector (LBA)
  41    12-15: nr of sectors in partition
  42 */
  43
  44 #define BYTES2INT32(array,pos)                                  \
  45     ((long)array[pos] | ((long)array[pos+1] << 8 ) |            \
  46      ((long)array[pos+2] << 16 ) | ((long)array[pos+3] << 24 ))
  47
  48 static struct partinfo part[8]; /* space for 4 partitions on 2 drives */
  49 static int vol_drive[NUM_VOLUMES]; /* mounted to which drive (-1 if none) */
  50
  51 struct partinfo* disk_init(IF_MV_NONVOID(int drive))
  52 {
  53     int i;
  54     unsigned char sector[512];
  55 #ifdef HAVE_MULTIVOLUME
  56     /* For each drive, start at a different position, in order not to destroy
  57        the first entry of drive 0.
  58        That one is needed to calculate config sector position. */
  59     struct partinfo* pinfo = &part[drive*4];
  60     if ((size_t)drive >= sizeof(part)/sizeof(*part)/4)
  61         return NULL; /* out of space in table */
  62 #else
  63     struct partinfo* pinfo = part;
  64 #endif
  65
  66     ata_read_sectors(IF_MV2(drive,) 0,1,&sector);
  67
  68     /* check that the boot sector is initialized */
  69     if ( (sector[510] != 0x55) ||
  70          (sector[511] != 0xaa)) {
  71         DEBUGF("Bad boot sector signature\n");
  72         return NULL;
  73     }
  74
  75     /* parse partitions */
  76     for ( i=0; i<4; i++ ) {
  77         unsigned char* ptr = sector + 0x1be + 16*i;
  78         pinfo[i].type  = ptr[4];
  79         pinfo[i].start = BYTES2INT32(ptr, 8);
  80         pinfo[i].size  = BYTES2INT32(ptr, 12);
  81
  82         DEBUGF("Part%d: Type %02x, start: %08lx size: %08lx\n",
  83                i,pinfo[i].type,pinfo[i].start,pinfo[i].size);
  84
  85         /* extended? */
  86         if ( pinfo[i].type == 5 ) {
  87             /* not handled yet */
  88         }
  89     }
  90
  91     return pinfo;
  92 }
  93
  94 struct partinfo* disk_partinfo(int partition)
  95 {
  96     return &part[partition];
  97 }
  98
  99 int disk_mount_all(void)
 100 {
 101     int mounted;
 102     int i;
 103
 104 #ifdef HAVE_MMC
 105     card_enable_monitoring(false);
 106 #endif
 107
 108     fat_init(); /* reset all mounted partitions */
 109     for (i=0; i<NUM_VOLUMES; i++)
 110         vol_drive[i] = -1; /* mark all as unassigned */
 111
 112     mounted = disk_mount(0);
 113 #ifdef HAVE_HOTSWAP
 114     if (card_detect())
 115     {
 116         mounted += disk_mount(1); /* try 2nd "drive", too */
 117     }
 118 #ifdef HAVE_MMC
 119     card_enable_monitoring(true);
 120 #endif
 121 #endif
 122
 123     return mounted;
 124 }
 125
 126 static int get_free_volume(void)
 127 {
 128     int i;
 129     for (i=0; i<NUM_VOLUMES; i++)
 130     {
 131         if (vol_drive[i] == -1) /* unassigned? */
 132             return i;
 133     }
 134
 135     return -1; /* none found */
 136 }
 137
 138 int disk_mount(int drive)
 139 {
 140     int i;
 141     int mounted = 0; /* reset partition-on-drive flag */
 142     int volume = get_free_volume();
 143     struct partinfo* pinfo = disk_init(IF_MV(drive));
 144
 145     if (pinfo == NULL)
 146     {
 147         return 0;
 148     }
 149 #ifndef ELIO_TPJ1022
 150     /* The Elio's hard drive has no partition table and probing for partitions causes
 151        Rockbox to crash - so we temporarily disable the probing until we fix the
 152        real problem. */
 153     for (i=0; volume != -1 && i<4; i++)
 154     {
 155 #ifdef MAX_LOG_SECTOR_SIZE
 156         int j;
 157
 158         for (j = 1; j <= (MAX_LOG_SECTOR_SIZE/SECTOR_SIZE); j <<= 1)
 159         {
 160             if (!fat_mount(IF_MV2(volume,) IF_MV2(drive,) pinfo[i].start * j))
 161             {
 162                 pinfo[i].start *= j;
 163                 pinfo[i].size *= j;
 164                 mounted++;
 165                 vol_drive[volume] = drive; /* remember the drive for this volume */
 166                 volume = get_free_volume(); /* prepare next entry */
 167                 break;
 168             }
 169         }
 170 #else
 171         if (!fat_mount(IF_MV2(volume,) IF_MV2(drive,) pinfo[i].start))
 172         {
 173             mounted++;
 174             vol_drive[volume] = drive; /* remember the drive for this volume */
 175             volume = get_free_volume(); /* prepare next entry */
 176         }
 177 #endif
 178     }
 179 #endif
 180
 181     if (mounted == 0 && volume != -1) /* none of the 4 entries worked? */
 182     {   /* try "superfloppy" mode */
 183         DEBUGF("No partition found, trying to mount sector 0.\n");
 184         if (!fat_mount(IF_MV2(volume,) IF_MV2(drive,) 0))
 185         {
 186             mounted = 1;
 187             vol_drive[volume] = drive; /* remember the drive for this volume */
 188         }
 189     }
 190     return mounted;
 191 }
 192
 193 #ifdef HAVE_HOTSWAP
 194 int disk_unmount(int drive)
 195 {
 196     int unmounted = 0;
 197     int i;
 198     for (i=0; i<NUM_VOLUMES; i++)
 199     {
 200         if (vol_drive[i] == drive)
 201         {   /* force releasing resources */
 202             vol_drive[i] = -1; /* mark unused */
 203             unmounted++;
 204             release_files(i);
 205             release_dirs(i);
 206             fat_unmount(i, false);
 207         }
 208     }
 209
 210     return unmounted;
 211 }
 212 #endif /* #ifdef HAVE_HOTSWAP */