u-boot/disk/part_dos.c

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/*
* (C) Copyright 2001
* Raymond Lo, lo@routefree.com
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* SPDX-License-Identifier: GPL-2.0+
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*/
/*
* Support for harddisk partitions.
*
* To be compatible with LinuxPPC and Apple we use the standard Apple
* SCSI disk partitioning scheme. For more information see:
* http://developer.apple.com/techpubs/mac/Devices/Devices-126.html#MARKER-14-92
*/
#include <common.h>
#include <command.h>
#include <ide.h>
#include <memalign.h>
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#include "part_dos.h"
#ifdef HAVE_BLOCK_DEVICE
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#define DOS_PART_DEFAULT_SECTOR 512
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/* Convert char[4] in little endian format to the host format integer
*/
static inline unsigned int le32_to_int(unsigned char *le32)
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{
return ((le32[3] << 24) +
(le32[2] << 16) +
(le32[1] << 8) +
le32[0]
);
}
static inline int is_extended(int part_type)
{
return (part_type == 0x5 ||
part_type == 0xf ||
part_type == 0x85);
}
static inline int is_bootable(dos_partition_t *p)
{
return p->boot_ind == 0x80;
}
static void print_one_part(dos_partition_t *p, lbaint_t ext_part_sector,
int part_num, unsigned int disksig)
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{
lbaint_t lba_start = ext_part_sector + le32_to_int (p->start4);
lbaint_t lba_size = le32_to_int (p->size4);
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printf("%3d\t%-10" LBAFlength "u\t%-10" LBAFlength
"u\t%08x-%02x\t%02x%s%s\n",
part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
(is_extended(p->sys_ind) ? " Extd" : ""),
(is_bootable(p) ? " Boot" : ""));
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}
static int test_block_type(unsigned char *buffer)
{
int slot;
struct dos_partition *p;
if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
(buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
return (-1);
} /* no DOS Signature at all */
p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET];
for (slot = 0; slot < 3; slot++) {
if (p->boot_ind != 0 && p->boot_ind != 0x80) {
if (!slot &&
(strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
"FAT", 3) == 0 ||
strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
"FAT32", 5) == 0)) {
return DOS_PBR; /* is PBR */
} else {
return -1;
}
}
}
return DOS_MBR; /* Is MBR */
}
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static int part_test_dos(struct blk_desc *dev_desc)
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{
ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
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if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1)
return -1;
if (test_block_type(buffer) != DOS_MBR)
return -1;
return 0;
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}
/* Print a partition that is relative to its Extended partition table
*/
static void print_partition_extended(struct blk_desc *dev_desc,
lbaint_t ext_part_sector,
lbaint_t relative,
int part_num, unsigned int disksig)
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{
ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
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dos_partition_t *pt;
int i;
if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
printf ("** Can't read partition table on %d:" LBAFU " **\n",
dev_desc->devnum, ext_part_sector);
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return;
}
i=test_block_type(buffer);
if (i != DOS_MBR) {
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printf ("bad MBR sector signature 0x%02x%02x\n",
buffer[DOS_PART_MAGIC_OFFSET],
buffer[DOS_PART_MAGIC_OFFSET + 1]);
return;
}
if (!ext_part_sector)
disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
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/* Print all primary/logical partitions */
pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
for (i = 0; i < 4; i++, pt++) {
/*
* fdisk does not show the extended partitions that
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* are not in the MBR
*/
if ((pt->sys_ind != 0) &&
(ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
print_one_part(pt, ext_part_sector, part_num, disksig);
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}
/* Reverse engr the fdisk part# assignment rule! */
if ((ext_part_sector == 0) ||
(pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
part_num++;
}
}
/* Follows the extended partitions */
pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
for (i = 0; i < 4; i++, pt++) {
if (is_extended (pt->sys_ind)) {
lbaint_t lba_start
= le32_to_int (pt->start4) + relative;
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print_partition_extended(dev_desc, lba_start,
ext_part_sector == 0 ? lba_start : relative,
part_num, disksig);
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}
}
return;
}
/* Print a partition that is relative to its Extended partition table
*/
static int part_get_info_extended(struct blk_desc *dev_desc,
lbaint_t ext_part_sector, lbaint_t relative,
int part_num, int which_part,
disk_partition_t *info, unsigned int disksig)
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{
ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
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dos_partition_t *pt;
int i;
int dos_type;
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if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
printf ("** Can't read partition table on %d:" LBAFU " **\n",
dev_desc->devnum, ext_part_sector);
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return -1;
}
if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
printf ("bad MBR sector signature 0x%02x%02x\n",
buffer[DOS_PART_MAGIC_OFFSET],
buffer[DOS_PART_MAGIC_OFFSET + 1]);
return -1;
}
#ifdef CONFIG_PARTITION_UUIDS
if (!ext_part_sector)
disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
#endif
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/* Print all primary/logical partitions */
pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
for (i = 0; i < 4; i++, pt++) {
/*
* fdisk does not show the extended partitions that
* are not in the MBR
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*/
if (((pt->boot_ind & ~0x80) == 0) &&
(pt->sys_ind != 0) &&
(part_num == which_part) &&
(is_extended(pt->sys_ind) == 0)) {
info->blksz = DOS_PART_DEFAULT_SECTOR;
info->start = (lbaint_t)(ext_part_sector +
le32_to_int(pt->start4));
info->size = (lbaint_t)le32_to_int(pt->size4);
part_set_generic_name(dev_desc, part_num,
(char *)info->name);
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/* sprintf(info->type, "%d, pt->sys_ind); */
strcpy((char *)info->type, "U-Boot");
info->bootable = is_bootable(pt);
#ifdef CONFIG_PARTITION_UUIDS
sprintf(info->uuid, "%08x-%02x", disksig, part_num);
#endif
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return 0;
}
/* Reverse engr the fdisk part# assignment rule! */
if ((ext_part_sector == 0) ||
(pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
part_num++;
}
}
/* Follows the extended partitions */
pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
for (i = 0; i < 4; i++, pt++) {
if (is_extended (pt->sys_ind)) {
lbaint_t lba_start
= le32_to_int (pt->start4) + relative;
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return part_get_info_extended(dev_desc, lba_start,
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ext_part_sector == 0 ? lba_start : relative,
part_num, which_part, info, disksig);
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}
}
/* Check for DOS PBR if no partition is found */
dos_type = test_block_type(buffer);
if (dos_type == DOS_PBR) {
info->start = 0;
info->size = dev_desc->lba;
info->blksz = DOS_PART_DEFAULT_SECTOR;
info->bootable = 0;
strcpy((char *)info->type, "U-Boot");
#ifdef CONFIG_PARTITION_UUIDS
info->uuid[0] = 0;
#endif
return 0;
}
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return -1;
}
void part_print_dos(struct blk_desc *dev_desc)
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{
printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
print_partition_extended(dev_desc, 0, 0, 1, 0);
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}
int part_get_info_dos(struct blk_desc *dev_desc, int part,
disk_partition_t *info)
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{
return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
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}
int is_valid_dos_buf(void *buf)
{
return test_block_type(buf) == DOS_MBR ? 0 : -1;
}
int write_mbr_partition(struct blk_desc *dev_desc, void *buf)
{
if (is_valid_dos_buf(buf))
return -1;
/* write MBR */
if (blk_dwrite(dev_desc, 0, 1, buf) != 1) {
printf("%s: failed writing '%s' (1 blks at 0x0)\n",
__func__, "MBR");
return 1;
}
return 0;
}
U_BOOT_PART_TYPE(dos) = {
.name = "DOS",
.part_type = PART_TYPE_DOS,
.max_entries = DOS_ENTRY_NUMBERS,
.get_info = part_get_info_ptr(part_get_info_dos),
.print = part_print_ptr(part_print_dos),
.test = part_test_dos,
};
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#endif