-/* File related stuff
-
- Copyright (C) 1999 Benjamin Herrenschmidt
-
- Todo: Add disklabel (or let OF do it ?). Eventually think about
- fixing CDROM handling by directly using the ATAPI layer.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+/*
+ * partition.c - partition table support
+ *
+ * Copyright (C) 2004 Sven Luther
+ *
+ * Copyright (C) 2001, 2002 Ethan Benson
+ *
+ * Copyright (C) 1999 Benjamin Herrenschmidt
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+/*
+ * Todo: Add disklabel (or let OF do it ?). Eventually think about
+ * fixing CDROM handling by directly using the ATAPI layer.
+ */
#include "ctype.h"
#include "types.h"
#include "stdlib.h"
#include "mac-part.h"
#include "fdisk-part.h"
+#include "amiga-part.h"
#include "partition.h"
#include "prom.h"
#include "string.h"
return 0;
}
+/*
+ * Detects and read amiga partition tables.
+ */
+
+static int
+_amiga_checksum (unsigned int blk_size)
+{
+ unsigned int sum;
+ int i, end;
+ unsigned int *amiga_block = (unsigned int *) block_buffer;
+
+ sum = amiga_block[0];
+ end = amiga_block[AMIGA_LENGTH];
+
+ if (end > blk_size) end = blk_size;
+
+ for (i = 1; i < end; i++) sum += amiga_block[i];
+
+ return sum;
+}
+
+static int
+_amiga_find_rdb (const char *dev_name, prom_handle disk, unsigned int prom_blksize)
+{
+ int i;
+ unsigned int *amiga_block = (unsigned int *) block_buffer;
+
+ for (i = 0; i<AMIGA_RDB_MAX; i++) {
+ if (i != 0) {
+ if (prom_readblocks(disk, i, 1, block_buffer) != 1) {
+ prom_printf("Can't read boot block %d\n", i);
+ break;
+ }
+ }
+ if ((amiga_block[AMIGA_ID] == AMIGA_ID_RDB) && (_amiga_checksum (prom_blksize) == 0))
+ return 1;
+ }
+ /* Amiga partition table not found, let's reread block 0 */
+ if (prom_readblocks(disk, 0, 1, block_buffer) != 1) {
+ prom_printf("Can't read boot blocks\n");
+ return 0; /* TODO: something bad happened, should fail more verbosely */
+ }
+ return 0;
+}
+
+static void
+partition_amiga_lookup( const char *dev_name, prom_handle disk,
+ unsigned int prom_blksize, struct partition_t** list )
+{
+ int partition, part;
+ unsigned int blockspercyl;
+ unsigned int *amiga_block = (unsigned int *) block_buffer;
+ unsigned int *used = NULL;
+ unsigned int possible;
+ int checksum;
+ int i;
+
+ blockspercyl = amiga_block[AMIGA_SECT] * amiga_block[AMIGA_HEADS];
+ possible = amiga_block[AMIGA_RDBLIMIT]/32 +1;
+
+ used = (unsigned int *) malloc (sizeof (unsigned int) * (possible + 1));
+
+ for (i=0; i < possible; i++) used[i] = 0;
+
+
+ for (part = amiga_block[AMIGA_PARTITIONS], partition = 0;
+ part != AMIGA_END;
+ part = amiga_block[AMIGA_PART_NEXT], partition++)
+ {
+ if (prom_readblocks(disk, part, 1, block_buffer) != 1) {
+ prom_printf("Can't read partition block %d\n", part);
+ break;
+ }
+ checksum = _amiga_checksum (prom_blksize);
+ if ((amiga_block[AMIGA_ID] == AMIGA_ID_PART) &&
+ (checksum == 0) &&
+ ((used[part/32] & (0x1 << (part % 32))) == 0))
+ {
+ used[part/32] |= (0x1 << (part % 32));
+ } else {
+ prom_printf("Amiga partition table corrupted at block %d\n", part);
+ if (amiga_block[AMIGA_ID] != AMIGA_ID_PART)
+ prom_printf ("block type is not partition but %08x\n", amiga_block[AMIGA_ID]);
+ if (checksum != 0)
+ prom_printf ("block checsum is bad : %d\n", checksum);
+ if ((used[part/32] & (0x1 << (part % 32))) != 0)
+ prom_printf ("partition table is looping, block %d already traveled\n", part);
+ break;
+ }
+
+ /* We use the partition block size from the partition table.
+ * The filesystem implmentations are responsible for mapping
+ * to their own fs blocksize */
+ add_new_partition(
+ list, /* partition list */
+ partition, /* partition number */
+ "Linux", /* type */
+ '\0', /* name */
+ blockspercyl * amiga_block[AMIGA_PART_LOWCYL], /* start */
+ blockspercyl * (amiga_block[AMIGA_PART_HIGHCYL] - amiga_block[AMIGA_PART_LOWCYL] + 1), /* size */
+ prom_blksize );
+ }
+}
+
struct partition_t*
partitions_lookup(const char *device)
{
0,
prom_blksize);
prom_printf("ISO9660 disk\n");
+ } else if (_amiga_find_rdb(device, disk, prom_blksize) != -1) {
+ /* amiga partition format */
+ partition_amiga_lookup(device, disk, prom_blksize, &list);
} else {
prom_printf("No supported partition table detected\n");
goto bail;
/*
* Local variables:
- * c-file-style: "K&R"
+ * c-file-style: "k&r"
* c-basic-offset: 5
* End:
*/