part_dos.c 7.53 KB
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/*
 * (C) Copyright 2001
 * Raymond Lo, lo@routefree.com
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
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 * 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>
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#include <memalign.h>
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#include "part_dos.h"

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#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 int le32_to_int(unsigned char *le32)
{
    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);
}

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static inline int is_bootable(dos_partition_t *p)
{
	return p->boot_ind == 0x80;
}

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static void print_one_part(dos_partition_t *p, int ext_part_sector,
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			   int part_num, unsigned int disksig)
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{
	int lba_start = ext_part_sector + le32_to_int (p->start4);
	int lba_size  = le32_to_int (p->size4);

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	printf("%3d\t%-10d\t%-10d\t%08x-%02x\t%02x%s%s\n",
		part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
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		(is_extended(p->sys_ind) ? " Extd" : ""),
		(is_bootable(p) ? " Boot" : ""));
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}

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static int test_block_type(unsigned char *buffer)
{
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	int slot;
	struct dos_partition *p;

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	if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
	    (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
		return (-1);
	} /* no DOS Signature at all */
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	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;
			}
		}
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	}
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	return DOS_MBR;	    /* Is MBR */
}

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int test_part_dos (block_dev_desc_t *dev_desc)
{
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	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
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	if (dev_desc->block_read(dev_desc->dev, 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
 */
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static void print_partition_extended(block_dev_desc_t *dev_desc,
				     int ext_part_sector, int relative,
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				     int part_num, unsigned int disksig)
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{
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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 (dev_desc->block_read(dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
		printf ("** Can't read partition table on %d:%d **\n",
			dev_desc->dev, ext_part_sector);
		return;
	}
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	i=test_block_type(buffer);
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	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;
	}
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	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++) {
		/*
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		 * 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)) ) {
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			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)) {
			int 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,
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				part_num, disksig);
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		}
	}

	return;
}


/*  Print a partition that is relative to its Extended partition table
 */
static int get_partition_info_extended (block_dev_desc_t *dev_desc, int ext_part_sector,
				 int relative, int part_num,
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				 int which_part, disk_partition_t *info,
				 unsigned int disksig)
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{
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	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
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	dos_partition_t *pt;
	int i;
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	int dos_type;
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	if (dev_desc->block_read (dev_desc->dev, ext_part_sector, 1, (ulong *) buffer) != 1) {
		printf ("** Can't read partition table on %d:%d **\n",
			dev_desc->dev, ext_part_sector);
		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;
	}

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#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++) {
		/*
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		 * fdisk does not show the extended partitions that
		 * are not in the MBR
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		 */
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		if (((pt->boot_ind & ~0x80) == 0) &&
		    (pt->sys_ind != 0) &&
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		    (part_num == which_part) &&
		    (is_extended(pt->sys_ind) == 0)) {
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			info->blksz = DOS_PART_DEFAULT_SECTOR;
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			info->start = (lbaint_t)(ext_part_sector +
					le32_to_int(pt->start4));
			info->size  = (lbaint_t)le32_to_int(pt->size4);
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			switch(dev_desc->if_type) {
				case IF_TYPE_IDE:
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				case IF_TYPE_SATA:
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				case IF_TYPE_ATAPI:
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					sprintf ((char *)info->name, "hd%c%d",
						'a' + dev_desc->dev, part_num);
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					break;
				case IF_TYPE_SCSI:
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					sprintf ((char *)info->name, "sd%c%d",
						'a' + dev_desc->dev, part_num);
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					break;
				case IF_TYPE_USB:
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					sprintf ((char *)info->name, "usbd%c%d",
						'a' + dev_desc->dev, part_num);
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					break;
				case IF_TYPE_DOC:
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					sprintf ((char *)info->name, "docd%c%d",
						'a' + dev_desc->dev, part_num);
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					break;
				default:
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					sprintf ((char *)info->name, "xx%c%d",
						'a' + dev_desc->dev, part_num);
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					break;
			}
			/* sprintf(info->type, "%d, pt->sys_ind); */
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			sprintf ((char *)info->type, "U-Boot");
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			info->bootable = is_bootable(pt);
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#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)) {
			int lba_start = le32_to_int (pt->start4) + relative;

			return get_partition_info_extended (dev_desc, lba_start,
				 ext_part_sector == 0 ? lba_start : relative,
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				 part_num, which_part, info, disksig);
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		}
	}
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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;
		sprintf ((char *)info->type, "U-Boot");
#ifdef CONFIG_PARTITION_UUIDS
		info->uuid[0] = 0;
#endif
		return 0;
	}

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	return -1;
}

void print_part_dos (block_dev_desc_t *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 get_partition_info_dos (block_dev_desc_t *dev_desc, int part, disk_partition_t * info)
{
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	return get_partition_info_extended(dev_desc, 0, 0, 1, part, info, 0);
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}


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#endif