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Make ar7_part more readable and endianness safe

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SVN-Revision: 8886
This commit is contained in:
Matteo Croce
2007-09-20 19:25:38 +00:00
parent fbc7e5e4fc
commit 8d162264af
2 changed files with 64 additions and 42 deletions
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29
target/linux/ar7/files/drivers/mtd/ar7part.c
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@@ -26,7 +26,18 @@
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/bootmem.h>
#include <linux/squashfs_fs.h>
#include <linux/magic.h>
#define AR7_PARTS 4
#define ROOT_OFFSET 0xe0000
#ifdef CONFIG_CPU_LITTLE_ENDIAN
#define LOADER_MAGIC1 0xfeedfa42
#define LOADER_MAGIC2 0xfeed1281
#else
#define LOADER_MAGIC1 0x42faedfe
#define LOADER_MAGIC2 0x8112edfe
#endif
struct ar7_bin_rec {
unsigned int checksum;
@@ -34,7 +45,7 @@ struct ar7_bin_rec {
unsigned int address;
};
static struct mtd_partition ar7_parts[5];
static struct mtd_partition ar7_parts[AR7_PARTS];
static int create_mtd_partitions(struct mtd_info *master,
struct mtd_partition **pparts,
@@ -43,12 +54,10 @@ static int create_mtd_partitions(struct mtd_info *master,
struct ar7_bin_rec header;
unsigned int offset, len;
unsigned int pre_size = master->erasesize, post_size = 0;
unsigned int root_offset = 0xe0000;
unsigned int root_offset = ROOT_OFFSET;
int retries = 10;
printk(KERN_INFO "Parsing AR7 partition map...\n");
ar7_parts[0].name = "loader";
ar7_parts[0].offset = 0;
ar7_parts[0].size = master->erasesize;
@@ -65,9 +74,9 @@ static int create_mtd_partitions(struct mtd_info *master,
sizeof(header), &len, (u_char *)&header);
if (!strncmp((char *)&header, "TIENV0.8", 8))
ar7_parts[1].offset = pre_size;
if (header.checksum == 0xfeedfa42)
if (header.checksum == LOADER_MAGIC1)
break;
if (header.checksum == 0xfeed1281)
if (header.checksum == LOADER_MAGIC2)
break;
pre_size += master->erasesize;
} while (retries--);
@@ -80,7 +89,7 @@ static int create_mtd_partitions(struct mtd_info *master,
}
switch (header.checksum) {
case 0xfeedfa42:
case LOADER_MAGIC1:
while (header.length) {
offset += sizeof(header) + header.length;
master->read(master, offset, sizeof(header),
@@ -88,7 +97,7 @@ static int create_mtd_partitions(struct mtd_info *master,
}
root_offset = offset + sizeof(header) + 4;
break;
case 0xfeed1281:
case LOADER_MAGIC2:
while (header.length) {
offset += sizeof(header) + header.length;
master->read(master, offset, sizeof(header),
@@ -120,7 +129,7 @@ static int create_mtd_partitions(struct mtd_info *master,
ar7_parts[3].mask_flags = 0;
*pparts = ar7_parts;
return 4;
return AR7_PARTS;
}
static struct mtd_part_parser ar7_parser = {