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 CONFIG_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)
{
EFI: find EFI system partition by legacy MBR partition type The UEFI spec allows an EFI system partition (ESP, with the bootloader or kernel EFI apps on it) to reside on a disk using a "legacy" MBR partitioning scheme. But in contrast to actual legacy disks the ESP is not marked as "bootable" using bit 7 in byte 0 of the legacy partition entry, but is instead using partition *type* 0xef (in contrast to 0x0b or 0x0c for a normal FAT partition). The EFI spec isn't 100% clear on this, but it even seems to discourage the use of the bootable flag for ESPs. Also it seems that some EFI implementations (EDK2?) even seem to ignore partitions marked as bootable (probably since they believe they contain legacy boot code). The Debian installer [1] (*not* mini.iso), for instance, contains such an MBR, where none of the two partitions are marked bootable, but the ESP has clearly type 0xef. Now U-Boot cannot find the ESP on such a disk (USB flash drive) and fails to load the EFI grub and thus the installer. Since it all boils down to the distro bootcmds eventually calling "part list -bootable" to find potential boot partitions, it seems logical to just add this "partition type is 0xef" condition to the is_bootable() implementation. This allows the bog standard arm64 Debian-testing installer to boot from an USB pen drive on Allwinner A64 boards (Pine64, BananaPi-M64). (Ubuntu and other distribution installers don't have a legacy MBR, so U-Boot falls back to El Torito there). [1] https://cdimage.debian.org/cdimage/daily-builds/daily/arch-latest/arm64/iso-cd/ Signed-off-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Alexander Graf <agraf@suse.de> Signed-off-by: Alexander Graf <agraf@suse.de>
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return (p->sys_ind == 0xef) || (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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{
#ifndef CONFIG_SPL_BUILD
ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr, 1);
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if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1)
return -1;
if (test_block_type((unsigned char *)mbr) != DOS_MBR)
return -1;
if (dev_desc->sig_type == SIG_TYPE_NONE &&
mbr->unique_mbr_signature != 0) {
dev_desc->sig_type = SIG_TYPE_MBR;
dev_desc->mbr_sig = mbr->unique_mbr_signature;
}
#else
ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1)
return -1;
if (test_block_type(buffer) != DOS_MBR)
return -1;
#endif
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;
}
#if CONFIG_IS_ENABLED(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) &&
(ext_part_sector == 0 || 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);
#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
sprintf(info->uuid, "%08x-%02x", disksig, part_num);
#endif
info->sys_ind = pt->sys_ind;
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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");
#if CONFIG_IS_ENABLED(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