24aeac2a75
it might be valid C but is confusing, and not consistent with the rest of file.c git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26191 a1c6a512-1295-4272-9138-f99709370657
239 lines
6.6 KiB
C
239 lines
6.6 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2002 by Björn Stenberg
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <stdio.h>
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#include "storage.h"
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#include "debug.h"
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#include "fat.h"
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#ifdef HAVE_HOTSWAP
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#include "hotswap.h"
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#include "dir.h" /* for release_dirs() */
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#include "file.h" /* for release_files() */
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#endif
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#include "disk.h"
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#include <string.h>
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/* Partition table entry layout:
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-----------------------
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0: 0x80 - active
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1: starting head
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2: starting sector
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3: starting cylinder
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4: partition type
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5: end head
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6: end sector
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7: end cylinder
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8-11: starting sector (LBA)
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12-15: nr of sectors in partition
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*/
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#define BYTES2INT32(array,pos) \
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((long)array[pos] | ((long)array[pos+1] << 8 ) | \
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((long)array[pos+2] << 16 ) | ((long)array[pos+3] << 24 ))
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static const unsigned char fat_partition_types[] = {
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0x0b, 0x1b, /* FAT32 + hidden variant */
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0x0c, 0x1c, /* FAT32 (LBA) + hidden variant */
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#ifdef HAVE_FAT16SUPPORT
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0x04, 0x14, /* FAT16 <= 32MB + hidden variant */
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0x06, 0x16, /* FAT16 > 32MB + hidden variant */
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0x0e, 0x1e, /* FAT16 (LBA) + hidden variant */
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#endif
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};
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static struct partinfo part[NUM_DRIVES*4]; /* space for 4 partitions on 2 drives */
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static int vol_drive[NUM_VOLUMES]; /* mounted to which drive (-1 if none) */
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#ifdef MAX_LOG_SECTOR_SIZE
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int disk_sector_multiplier = 1;
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#endif
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struct partinfo* disk_init(IF_MD_NONVOID(int drive))
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{
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int i;
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unsigned char sector[SECTOR_SIZE];
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#ifdef HAVE_MULTIDRIVE
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/* For each drive, start at a different position, in order not to destroy
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the first entry of drive 0.
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That one is needed to calculate config sector position. */
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struct partinfo* pinfo = &part[drive*4];
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if ((size_t)drive >= sizeof(part)/sizeof(*part)/4)
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return NULL; /* out of space in table */
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#else
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struct partinfo* pinfo = part;
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const int drive = 0;
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(void)drive;
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#endif
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storage_read_sectors(IF_MD2(drive,) 0,1, sector);
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/* check that the boot sector is initialized */
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if ( (sector[510] != 0x55) ||
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(sector[511] != 0xaa)) {
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DEBUGF("Bad boot sector signature\n");
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return NULL;
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}
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/* parse partitions */
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for ( i=0; i<4; i++ ) {
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unsigned char* ptr = sector + 0x1be + 16*i;
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pinfo[i].type = ptr[4];
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pinfo[i].start = BYTES2INT32(ptr, 8);
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pinfo[i].size = BYTES2INT32(ptr, 12);
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DEBUGF("Part%d: Type %02x, start: %08lx size: %08lx\n",
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i,pinfo[i].type,pinfo[i].start,pinfo[i].size);
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/* extended? */
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if ( pinfo[i].type == 5 ) {
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/* not handled yet */
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}
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}
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return pinfo;
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}
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struct partinfo* disk_partinfo(int partition)
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{
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return &part[partition];
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}
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int disk_mount_all(void)
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{
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int mounted=0;
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int i;
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#ifdef HAVE_HOTSWAP
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card_enable_monitoring(false);
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#endif
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fat_init(); /* reset all mounted partitions */
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for (i=0; i<NUM_VOLUMES; i++)
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vol_drive[i] = -1; /* mark all as unassigned */
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#ifndef HAVE_MULTIDRIVE
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mounted = disk_mount(0);
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#else
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for(i=0;i<NUM_DRIVES;i++)
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{
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#ifdef HAVE_HOTSWAP
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if (storage_present(i))
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#endif
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mounted += disk_mount(i);
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}
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#endif
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#ifdef HAVE_HOTSWAP
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card_enable_monitoring(true);
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#endif
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return mounted;
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}
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static int get_free_volume(void)
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{
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int i;
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for (i=0; i<NUM_VOLUMES; i++)
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{
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if (vol_drive[i] == -1) /* unassigned? */
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return i;
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}
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return -1; /* none found */
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}
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int disk_mount(int drive)
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{
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int mounted = 0; /* reset partition-on-drive flag */
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int volume = get_free_volume();
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struct partinfo* pinfo = disk_init(IF_MD(drive));
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if (pinfo == NULL)
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{
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return 0;
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}
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#if defined(TOSHIBA_GIGABEAT_S)
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int i = 1; /* For the Gigabeat S, we mount the second partition */
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#else
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int i = 0;
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#endif
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for (; volume != -1 && i<4 && mounted<NUM_VOLUMES_PER_DRIVE; i++)
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{
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if (memchr(fat_partition_types, pinfo[i].type,
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sizeof(fat_partition_types)) == NULL)
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continue; /* not an accepted partition type */
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#ifdef MAX_LOG_SECTOR_SIZE
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int j;
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for (j = 1; j <= (MAX_LOG_SECTOR_SIZE/SECTOR_SIZE); j <<= 1)
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{
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if (!fat_mount(IF_MV2(volume,) IF_MD2(drive,) pinfo[i].start * j))
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{
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pinfo[i].start *= j;
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pinfo[i].size *= j;
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mounted++;
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vol_drive[volume] = drive; /* remember the drive for this volume */
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volume = get_free_volume(); /* prepare next entry */
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if (drive == 0)
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disk_sector_multiplier = j;
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break;
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}
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}
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#else
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if (!fat_mount(IF_MV2(volume,) IF_MD2(drive,) pinfo[i].start))
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{
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mounted++;
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vol_drive[volume] = drive; /* remember the drive for this volume */
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volume = get_free_volume(); /* prepare next entry */
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}
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#endif
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}
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if (mounted == 0 && volume != -1) /* none of the 4 entries worked? */
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{ /* try "superfloppy" mode */
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DEBUGF("No partition found, trying to mount sector 0.\n");
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if (!fat_mount(IF_MV2(volume,) IF_MD2(drive,) 0))
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{
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mounted = 1;
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vol_drive[volume] = drive; /* remember the drive for this volume */
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}
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}
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return mounted;
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}
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#ifdef HAVE_HOTSWAP
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int disk_unmount(int drive)
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{
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int unmounted = 0;
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int i;
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for (i=0; i<NUM_VOLUMES; i++)
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{
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if (vol_drive[i] == drive)
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{ /* force releasing resources */
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vol_drive[i] = -1; /* mark unused */
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unmounted++;
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release_files(i);
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release_dirs(i);
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fat_unmount(i, false);
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}
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}
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return unmounted;
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}
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#endif /* #ifdef HAVE_HOTSWAP */
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