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Added disk/partition handling

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@405 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Björn Stenberg 2002-05-03 11:59:53 +00:00
parent 86a59ecdf6
commit c7f7934e8f
8 changed files with 164 additions and 58 deletions
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74
firmware/common/disk.c Normal file
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Björn Stenberg
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "ata.h"
#include "debug.h"
#include "disk.h"
/* Partition table entry layout:
-----------------------
0: 0x80 - active
1: starting head
2: starting sector
3: starting cylinder
4: partition type
5: end head
6: end sector
7: end cylinder
8-11: starting sector (LBA)
12-15: nr of sectors in partition
*/
#define BYTES2INT32(array,pos) \
(array[pos] | (array[pos+1] << 8 ) | \
(array[pos+2] << 16 ) | (array[pos+3] << 24 ))
struct partinfo part[8];
int disk_init(void)
{
int i;
unsigned char sector[512];
ata_read_sectors(0,1,&sector);
/* check that the boot sector is initialized */
if ( (sector[510] != 0x55) ||
(sector[511] != 0xaa)) {
DEBUGF("Bad boot sector signature\n");
return -1;
}
/* parse partitions */
for ( i=0; i<4; i++ ) {
unsigned char* ptr = sector + 0x1be + 16*i;
part[i].type = ptr[4];
part[i].start = BYTES2INT32(ptr, 8);
part[i].size = BYTES2INT32(ptr, 12);
DEBUGF("Part%d: Type %02x, start: %08x size: %08x\n",
i,part[i].type,part[i].start,part[i].size);
/* extended? */
if ( part[i].type == 5 ) {
/* not handled yet */
}
}
return 0;
}