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authorJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>2013-02-16 14:47:07 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2013-02-16 23:39:08 +0100
commit263bb23ed2e21ed411b87c32b6c27db0f35a33a1 (patch)
treeecb72af967a6bf9b6fca87b7eb9911ee64c6eee1 /common/partitions/dos.c
parenta7d9ec049844616b5b5f45847e6dff133ea52d96 (diff)
downloadbarebox-263bb23ed2e21ed411b87c32b6c27db0f35a33a1.tar.gz
partitons: add framework
so we can support multiple format use filetpye to detect the parser to use Cc: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'common/partitions/dos.c')
-rw-r--r--common/partitions/dos.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/common/partitions/dos.c b/common/partitions/dos.c
new file mode 100644
index 0000000..4f147f7
--- /dev/null
+++ b/common/partitions/dos.c
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2009...2011 Juergen Beisert, Pengutronix
+ *
+ * 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.
+ */
+
+#include <common.h>
+#include <disks.h>
+#include <init.h>
+#include <asm/unaligned.h>
+
+#include "parser.h"
+
+/**
+ * Guess the size of the disk, based on the partition table entries
+ * @param dev device to create partitions for
+ * @param table partition table
+ * @return sector count
+ */
+static int disk_guess_size(struct device_d *dev, struct partition_entry *table)
+{
+ uint64_t size = 0;
+ int i;
+
+ for (i = 0; i < 4; i++) {
+ if (table[i].partition_start != 0) {
+ size += get_unaligned_le32(&table[i].partition_start) - size;
+ size += get_unaligned_le32(&table[i].partition_size);
+ }
+ }
+
+ return (int)size;
+}
+
+/**
+ * Check if a DOS like partition describes this block device
+ * @param blk Block device to register to
+ * @param pd Where to store the partition information
+ *
+ * It seems at least on ARM this routine canot use temp. stack space for the
+ * sector. So, keep the malloc/free.
+ */
+static void dos_partition(void *buf, struct block_device *blk,
+ struct partition_desc *pd)
+{
+ struct partition_entry *table;
+ struct partition pentry;
+ uint8_t *buffer = buf;
+ int i;
+
+ table = (struct partition_entry *)&buffer[446];
+
+ /* valid for x86 BIOS based disks only */
+ if (IS_ENABLED(CONFIG_DISK_BIOS) && blk->num_blocks == 0)
+ blk->num_blocks = disk_guess_size(blk->dev, table);
+
+ for (i = 0; i < 4; i++) {
+ pentry.first_sec = get_unaligned_le32(&table[i].partition_start);
+ pentry.size = get_unaligned_le32(&table[i].partition_size);
+
+ if (pentry.first_sec != 0) {
+ pd->parts[pd->used_entries].first_sec = pentry.first_sec;
+ pd->parts[pd->used_entries].size = pentry.size;
+ pd->used_entries++;
+ } else {
+ dev_dbg(blk->dev, "Skipping empty partition %d\n", i);
+ }
+ }
+}
+
+struct partition_parser dos = {
+ .parse = dos_partition,
+ .type = filetype_mbr,
+};
+
+static int dos_partition_init(void)
+{
+ return partition_parser_register(&dos);
+}
+postconsole_initcall(dos_partition_init);