[PATCH 3/5] partitons: add framework
Jean-Christophe PLAGNIOL-VILLARD
plagnioj at jcrosoft.com
Sat Feb 16 08:47:07 EST 2013
so we can support multiple format
use filetpye to detect the parser to use
Cc: Rob Herring <rob.herring at calxeda.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
---
common/Kconfig | 14 +----
common/Makefile | 2 +-
common/partitions.c | 141 +++++++++++++++++---------------------------
common/partitions/Kconfig | 13 ++++
common/partitions/Makefile | 1 +
common/partitions/dos.c | 88 +++++++++++++++++++++++++++
common/partitions/parser.h | 35 +++++++++++
7 files changed, 194 insertions(+), 100 deletions(-)
create mode 100644 common/partitions/Kconfig
create mode 100644 common/partitions/Makefile
create mode 100644 common/partitions/dos.c
create mode 100644 common/partitions/parser.h
diff --git a/common/Kconfig b/common/Kconfig
index 3f6c11e..3a55e01 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -478,19 +478,7 @@ config PARTITION
bool
prompt "Enable Partitions"
-config PARTITION_DISK
- depends on PARTITION
- bool "DISK partition support"
- help
- Add support for handling common partition tables on all kind of disk
- like devices (harddisks, CF cards, SD cards and so on)
-
-config PARTITION_DISK_DOS
- depends on PARTITION_DISK
- default y
- bool "DOS partition support"
- help
- Add support to handle partitions in DOS style.
+source common/partitions/Kconfig
config DEFAULT_ENVIRONMENT
bool
diff --git a/common/Makefile b/common/Makefile
index 7206eed..b264cb8 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -7,7 +7,7 @@ obj-$(CONFIG_ENV_HANDLING) += environment.o
obj-$(CONFIG_AUTO_COMPLETE) += complete.o
obj-$(CONFIG_POLLER) += poller.o
obj-$(CONFIG_BLOCK) += block.o
-obj-$(CONFIG_PARTITION_DISK) += partitions.o
+obj-$(CONFIG_PARTITION_DISK) += partitions.o partitions/
obj-$(CONFIG_CMD_LOADS) += s_record.o
obj-$(CONFIG_OFTREE) += oftree.o
diff --git a/common/partitions.c b/common/partitions.c
index 24310a3..1153ac9 100644
--- a/common/partitions.c
+++ b/common/partitions.c
@@ -27,92 +27,12 @@
#include <block.h>
#include <asm/unaligned.h>
#include <disks.h>
-#include <dma.h>
#include <filetype.h>
+#include <dma.h>
-struct partition {
- uint64_t first_sec;
- uint64_t size;
-};
-
-struct partition_desc {
- int used_entries;
- struct partition parts[8];
-};
-
-/**
- * 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 __maybe_unused try_dos_partition(struct block_device *blk,
- struct partition_desc *pd)
-{
- uint8_t *buffer;
- struct partition_entry *table;
- struct partition pentry;
- int i, rc;
-
- buffer = dma_alloc(SECTOR_SIZE);
-
- /* read in the MBR to get the partition table */
- rc = blk->ops->read(blk, buffer, 0, 1);
- if (rc != 0) {
- dev_err(blk->dev, "Cannot read MBR/partition table\n");
- goto on_error;
- }
-
- if (is_fat_or_mbr(buffer, NULL) != filetype_mbr) {
- dev_info(blk->dev, "No partition table found\n");
- goto on_error;
- }
-
- 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);
- }
- }
+#include "partitions/parser.h"
-on_error:
- dma_free(buffer);
-}
+static LIST_HEAD(partition_parser_list);
/**
* Register one partition on the given block device
@@ -135,6 +55,33 @@ static int register_one_partition(struct block_device *blk,
0, partition_name);
}
+static struct partition_parser *partition_parser_get_by_filetype(uint8_t *buf)
+{
+ enum filetype type;
+ struct partition_parser *parser;
+
+ /* first new partition table as EFI GPT */
+ type = file_detect_type(buf, SECTOR_SIZE * 2);
+
+ list_for_each_entry(parser, &partition_parser_list, list) {
+ if (parser->type == type)
+ return parser;
+ }
+
+ /* if not parser found search for old one
+ * so if EFI GPT not enable take it as MBR
+ * useful for compatibility
+ */
+ type = file_detect_type(buf, SECTOR_SIZE);
+
+ list_for_each_entry(parser, &partition_parser_list, list) {
+ if (parser->type == type)
+ return parser;
+ }
+
+ return NULL;
+}
+
/**
* Try to collect partition information on the given block device
* @param blk Block device to examine
@@ -147,10 +94,23 @@ int parse_partition_table(struct block_device *blk)
struct partition_desc pdesc = { .used_entries = 0, };
int i;
int rc = 0;
+ struct partition_parser *parser;
+ uint8_t *buf;
+
+ buf = dma_alloc(SECTOR_SIZE * 2);
+
+ rc = blk->ops->read(blk, buf, 0, 2);
+ if (rc != 0) {
+ dev_err(blk->dev, "Cannot read MBR/partition table\n");
+ goto on_error;
+ }
+
+ parser = partition_parser_get_by_filetype(buf);
+ if (!parser)
+ goto on_error;
+
+ parser->parse(buf, blk, &pdesc);
-#ifdef CONFIG_PARTITION_DISK_DOS
- try_dos_partition(blk, &pdesc);
-#endif
if (!pdesc.used_entries)
return 0;
@@ -165,5 +125,14 @@ int parse_partition_table(struct block_device *blk)
rc = 0;
}
+on_error:
+ dma_free(buf);
return rc;
}
+
+int partition_parser_register(struct partition_parser *p)
+{
+ list_add_tail(&p->list, &partition_parser_list);
+
+ return 0;
+}
diff --git a/common/partitions/Kconfig b/common/partitions/Kconfig
new file mode 100644
index 0000000..3f81c2f
--- /dev/null
+++ b/common/partitions/Kconfig
@@ -0,0 +1,13 @@
+config PARTITION_DISK
+ depends on PARTITION
+ bool "DISK partition support"
+ help
+ Add support for handling common partition tables on all kind of disk
+ like devices (harddisks, CF cards, SD cards and so on)
+
+config PARTITION_DISK_DOS
+ depends on PARTITION_DISK
+ default y
+ bool "DOS partition support"
+ help
+ Add support to handle partitions in DOS style.
diff --git a/common/partitions/Makefile b/common/partitions/Makefile
new file mode 100644
index 0000000..0a5c70d
--- /dev/null
+++ b/common/partitions/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_PARTITION_DISK_DOS) += dos.o
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);
diff --git a/common/partitions/parser.h b/common/partitions/parser.h
new file mode 100644
index 0000000..13506c0
--- /dev/null
+++ b/common/partitions/parser.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2013 Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
+ *
+ * Under GPLv2 only
+ */
+
+#ifndef __PARTITIONS_PARSER_H__
+#define __PARTITIONS_PARSER_H__
+
+#include <block.h>
+#include <filetype.h>
+#include <linux/list.h>
+
+#define MAX_PARTITION 8
+
+struct partition {
+ uint64_t first_sec;
+ uint64_t size;
+};
+
+struct partition_desc {
+ int used_entries;
+ struct partition parts[MAX_PARTITION];
+};
+
+struct partition_parser {
+ void (*parse)(void *buf, struct block_device *blk, struct partition_desc *pd);
+ enum filetype type;
+
+ struct list_head list;
+};
+
+int partition_parser_register(struct partition_parser *p);
+
+#endif /* __PARTITIONS_PARSER_H__ */
--
1.7.10.4
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