[thirdparty/u-boot.git] / disk / part_dos.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2001
 * Raymond Lo, lo@routefree.com
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 */

/*
 * 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 <blk.h>
#include <command.h>
#include <ide.h>
#include <memalign.h>
#include <asm/unaligned.h>
#include <linux/compiler.h>
#include "part_dos.h"
#include <part.h>

#define DOS_PART_DEFAULT_SECTOR 512

/* should this be configurable? It looks like it's not very common at all
 * to use large numbers of partitions */
#define MAX_EXT_PARTS 256

static inline int is_extended(int part_type)
{
    return (part_type == DOS_PART_TYPE_EXTENDED ||
	    part_type == DOS_PART_TYPE_EXTENDED_LBA ||
	    part_type == DOS_PART_TYPE_EXTENDED_LINUX);
}

static int get_bootable(dos_partition_t *p)
{
	int ret = 0;

	if (p->sys_ind == 0xef)
		ret |= PART_EFI_SYSTEM_PARTITION;
	if (p->boot_ind == 0x80)
		ret |= PART_BOOTABLE;
	return ret;
}

static void print_one_part(dos_partition_t *p, lbaint_t ext_part_sector,
			   int part_num, unsigned int disksig)
{
	lbaint_t lba_start = ext_part_sector + get_unaligned_le32(p->start4);
	lbaint_t lba_size  = get_unaligned_le32(p->size4);

	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" : ""),
		(get_bootable(p) ? " Boot" : ""));
}

static int test_block_type(unsigned char *buffer)
{
	int slot;
	struct dos_partition *p;
	int part_count = 0;

	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];

	/* Check that the boot indicators are valid and count the partitions. */
	for (slot = 0; slot < 4; ++slot, ++p) {
		if (p->boot_ind != 0 && p->boot_ind != 0x80)
			break;
		if (p->sys_ind)
			++part_count;
	}

	/*
	 * If the partition table is invalid or empty,
	 * check if this is a DOS PBR
	 */
	if (slot != 4 || !part_count) {
		if (!strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
			     "FAT", 3) ||
		    !strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
			     "FAT32", 5))
			return DOS_PBR; /* This is a DOS PBR and not an MBR */
	}
	if (slot == 4)
		return DOS_MBR;	/* This is an DOS MBR */

	/* This is neither a DOS MBR nor a DOS PBR */
	return -1;
}

static int part_test_dos(struct blk_desc *dev_desc)
{
#ifndef CONFIG_SPL_BUILD
	ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr,
			DIV_ROUND_UP(dev_desc->blksz, sizeof(legacy_mbr)));

	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;
}

/*  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)
{
	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
	dos_partition_t *pt;
	int i;

	/* set a maximum recursion level */
	if (part_num > MAX_EXT_PARTS)
	{
		printf("** Nested DOS partitions detected, stopping **\n");
		return;
    }

	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);
		return;
	}
	i=test_block_type(buffer);
	if (i != DOS_MBR) {
		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 = get_unaligned_le32(&buffer[DOS_PART_DISKSIG_OFFSET]);

	/* 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
		 */

		if ((pt->sys_ind != 0) &&
		    (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
			print_one_part(pt, ext_part_sector, part_num, disksig);
		}

		/* 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
				= get_unaligned_le32 (pt->start4) + relative;

			print_partition_extended(dev_desc, lba_start,
				ext_part_sector == 0  ? lba_start : relative,
				part_num, disksig);
		}
	}

	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,
				  struct disk_partition *info, uint disksig)
{
	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
	dos_partition_t *pt;
	int i;
	int dos_type;

	/* set a maximum recursion level */
	if (part_num > MAX_EXT_PARTS)
	{
		printf("** Nested DOS partitions detected, stopping **\n");
		return -1;
    }

	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);
		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 = get_unaligned_le32(&buffer[DOS_PART_DISKSIG_OFFSET]);
#endif

	/* 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
		 */
		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 +
					get_unaligned_le32(pt->start4));
			info->size  = (lbaint_t)get_unaligned_le32(pt->size4);
			part_set_generic_name(dev_desc, part_num,
					      (char *)info->name);
			/* sprintf(info->type, "%d, pt->sys_ind); */
			strcpy((char *)info->type, "U-Boot");
			info->bootable = get_bootable(pt);
#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
			sprintf(info->uuid, "%08x-%02x", disksig, part_num);
#endif
			info->sys_ind = pt->sys_ind;
			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
				= get_unaligned_le32 (pt->start4) + relative;

			return part_get_info_extended(dev_desc, lba_start,
				 ext_part_sector == 0 ? lba_start : relative,
				 part_num, which_part, info, disksig);
		}
	}

	/* 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;
	}

	return -1;
}

static void __maybe_unused part_print_dos(struct blk_desc *dev_desc)
{
	printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
	print_partition_extended(dev_desc, 0, 0, 1, 0);
}

static int __maybe_unused part_get_info_dos(struct blk_desc *dev_desc, int part,
		      struct disk_partition *info)
{
	return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
}

int is_valid_dos_buf(void *buf)
{
	return test_block_type(buf) == DOS_MBR ? 0 : -1;
}

#if CONFIG_IS_ENABLED(CMD_MBR)
static void lba_to_chs(lbaint_t lba, unsigned char *rc, unsigned char *rh,
		       unsigned char *rs)
{
	unsigned int c, h, s;
	/* use fixed CHS geometry */
	unsigned int sectpertrack = 63;
	unsigned int heads = 255;

	c = (lba + 1) / sectpertrack / heads;
	h = (lba + 1) / sectpertrack - c * heads;
	s = (lba + 1) - (c * heads + h) * sectpertrack;

	if (c > 1023) {
		c = 1023;
		h = 254;
		s = 63;
	}

	*rc = c & 0xff;
	*rh = h;
	*rs = s + ((c & 0x300) >> 2);
}

static void mbr_fill_pt_entry(dos_partition_t *pt, lbaint_t start,
		lbaint_t relative, lbaint_t size, uchar sys_ind, bool bootable)
{
	pt->boot_ind = bootable ? 0x80 : 0x00;
	pt->sys_ind = sys_ind;
	lba_to_chs(start, &pt->cyl, &pt->head, &pt->sector);
	lba_to_chs(start + size - 1, &pt->end_cyl, &pt->end_head, &pt->end_sector);
	put_unaligned_le32(relative, &pt->start4);
	put_unaligned_le32(size, &pt->size4);
}

int write_mbr_partitions(struct blk_desc *dev,
		struct disk_partition *p, int count, unsigned int disksig)
{
	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev->blksz);
	lbaint_t ext_part_start = 0, ext_part_size = 0, ext_part_sect = 0;
	dos_partition_t *pt;
	int i;

	memset(buffer, 0, dev->blksz);
	buffer[DOS_PART_MAGIC_OFFSET] = 0x55;
	buffer[DOS_PART_MAGIC_OFFSET + 1] = 0xaa;
	put_unaligned_le32(disksig, &buffer[DOS_PART_DISKSIG_OFFSET]);
	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);

	/* create all primary partitions */
	for (i = 0; i < 4 && i < count; i++, pt++) {
		mbr_fill_pt_entry(pt, p[i].start, p[i].start, p[i].size,
				  p[i].sys_ind, p[i].bootable);
		if (is_extended(p[i].sys_ind)) {
			ext_part_start = p[i].start;
			ext_part_size = p[i].size;
			ext_part_sect = p[i].start;
		}
	}

	if (i < count && !ext_part_start) {
		printf("%s: extended partition is needed for more than 4 partitions\n",
		        __func__);
		return -1;
	}

	/* write MBR */
	if (blk_dwrite(dev, 0, 1, buffer) != 1) {
		printf("%s: failed writing 'MBR' (1 blks at 0x0)\n",
		       __func__);
		return -1;
	}

	/* create extended volumes */
	for (; i < count; i++) {
		lbaint_t next_ebr = 0;

		memset(buffer, 0, dev->blksz);
		buffer[DOS_PART_MAGIC_OFFSET] = 0x55;
		buffer[DOS_PART_MAGIC_OFFSET + 1] = 0xaa;
		pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);

		mbr_fill_pt_entry(pt, p[i].start, p[i].start - ext_part_sect,
				  p[i].size, p[i].sys_ind, p[i].bootable);

		if (i + 1 < count) {
			pt++;
			next_ebr = p[i].start + p[i].size;
			mbr_fill_pt_entry(pt, next_ebr,
					  next_ebr - ext_part_start,
					  p[i+1].start + p[i+1].size - next_ebr,
					  DOS_PART_TYPE_EXTENDED, 0);
		}

		/* write EBR */
		if (blk_dwrite(dev, ext_part_sect, 1, buffer) != 1) {
			printf("%s: failed writing 'EBR' (1 blks at 0x%lx)\n",
			       __func__, ext_part_sect);
			return -1;
		}
		ext_part_sect = next_ebr;
	}

	/* Update the partition table entries*/
	part_init(dev);

	return 0;
}

int layout_mbr_partitions(struct disk_partition *p, int count,
			  lbaint_t total_sectors)
{
	struct disk_partition *ext = NULL;
	int i, j;
	lbaint_t ext_vol_start;

	/* calculate primary partitions start and size if needed */
	if (!p[0].start)
		p[0].start = DOS_PART_DEFAULT_GAP;
	for (i = 0; i < 4 && i < count; i++) {
		if (!p[i].start)
			p[i].start = p[i - 1].start + p[i - 1].size;
		if (!p[i].size) {
			lbaint_t end = total_sectors;
			lbaint_t allocated = 0;

			for (j = i + 1; j < 4 && j < count; j++) {
				if (p[j].start) {
					end = p[j].start;
					break;
				}
				allocated += p[j].size;
			}
			p[i].size = end - allocated - p[i].start;
		}
		if (p[i].sys_ind == 0x05)
			ext = &p[i];
	}

	if (count < 4)
		return 0;

	if (!ext) {
		log_err("extended partition is needed for more than 4 partitions\n");
		return -EINVAL;
	}

	/* calculate extended volumes start and size if needed */
	ext_vol_start = ext->start;
	for (i = 4; i < count; i++) {
		if (!p[i].start)
			p[i].start = ext_vol_start + DOS_PART_DEFAULT_GAP;
		if (!p[i].size) {
			lbaint_t end = ext->start + ext->size;
			lbaint_t allocated = 0;

			for (j = i + 1; j < count; j++) {
				if (p[j].start) {
					end = p[j].start - DOS_PART_DEFAULT_GAP;
					break;
				}
				allocated += p[j].size + DOS_PART_DEFAULT_GAP;
			}
			p[i].size = end - allocated - p[i].start;
		}
		ext_vol_start = p[i].start + p[i].size;
	}

	return 0;
}
#endif

int write_mbr_sector(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;
	}

	/* Update the partition table entries*/
	part_init(dev_desc);

	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,
};
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
fe8c2806 WD	2	/*
	3	* (C) Copyright 2001
	4	* Raymond Lo, lo@routefree.com
	5	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
fe8c2806 WD	6	*/
	7
	8	/*
	9	* Support for harddisk partitions.
	10	*
	11	* To be compatible with LinuxPPC and Apple we use the standard Apple
	12	* SCSI disk partitioning scheme. For more information see:
	13	* http://developer.apple.com/techpubs/mac/Devices/Devices-126.html#MARKER-14-92
	14	*/
	15
	16	#include <common.h>
e6f6f9e6	17	#include <blk.h>
fe8c2806 WD	18	#include <command.h>
fe8c2806 WD	19	#include <ide.h>
cf92e05c	20	#include <memalign.h>
97163dd1	21	#include <asm/unaligned.h>
cb571f91	22	#include <linux/compiler.h>
fe8c2806	23	#include "part_dos.h"
e6f6f9e6	24	#include <part.h>
fe8c2806	25
4a36be9b DD	26	#define DOS_PART_DEFAULT_SECTOR 512
4a36be9b DD	27
232e2f4f PE	28	/* should this be configurable? It looks like it's not very common at all
	29	* to use large numbers of partitions */
	30	#define MAX_EXT_PARTS 256
	31
fe8c2806 WD	32	static inline int is_extended(int part_type)
fe8c2806 WD	33	{
80bd05f2 MS	34	return (part_type == DOS_PART_TYPE_EXTENDED \|\|
	35	part_type == DOS_PART_TYPE_EXTENDED_LBA \|\|
	36	part_type == DOS_PART_TYPE_EXTENDED_LINUX);
fe8c2806 WD	37	}
fe8c2806 WD	38
25801acc	39	static int get_bootable(dos_partition_t *p)
40e0e568	40	{
25801acc HS	41	int ret = 0;
	42
	43	if (p->sys_ind == 0xef)
	44	ret \|= PART_EFI_SYSTEM_PARTITION;
	45	if (p->boot_ind == 0x80)
	46	ret \|= PART_BOOTABLE;
	47	return ret;
40e0e568 RH	48	}
40e0e568 RH	49
d29892ba	50	static void print_one_part(dos_partition_t *p, lbaint_t ext_part_sector,
e2e9b378	51	int part_num, unsigned int disksig)
fe8c2806	52	{
97163dd1 MS	53	lbaint_t lba_start = ext_part_sector + get_unaligned_le32(p->start4);
97163dd1 MS	54	lbaint_t lba_size = get_unaligned_le32(p->size4);
fe8c2806	55
d29892ba SM	56	printf("%3d\t%-10" LBAFlength "u\t%-10" LBAFlength
d29892ba SM	57	"u\t%08x-%02x\t%02x%s%s\n",
e2e9b378	58	part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
40e0e568	59	(is_extended(p->sys_ind) ? " Extd" : ""),
25801acc	60	(get_bootable(p) ? " Boot" : ""));
fe8c2806 WD	61	}
fe8c2806 WD	62
7205e407 WD	63	static int test_block_type(unsigned char *buffer)
7205e407 WD	64	{
9d956e0f EE	65	int slot;
9d956e0f EE	66	struct dos_partition *p;
34856b0f	67	int part_count = 0;
9d956e0f	68
7205e407 WD	69	if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) \|\|
	70	(buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
	71	return (-1);
	72	} /* no DOS Signature at all */
9d956e0f	73	p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET];
34856b0f HS	74
	75	/* Check that the boot indicators are valid and count the partitions. */
	76	for (slot = 0; slot < 4; ++slot, ++p) {
	77	if (p->boot_ind != 0 && p->boot_ind != 0x80)
	78	break;
	79	if (p->sys_ind)
	80	++part_count;
66c2d73c	81	}
7205e407	82
34856b0f HS	83	/*
	84	* If the partition table is invalid or empty,
	85	* check if this is a DOS PBR
	86	*/
	87	if (slot != 4 \|\| !part_count) {
	88	if (!strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
	89	"FAT", 3) \|\|
	90	!strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
	91	"FAT32", 5))
	92	return DOS_PBR; /* This is a DOS PBR and not an MBR */
	93	}
	94	if (slot == 4)
	95	return DOS_MBR; /* This is an DOS MBR */
	96
	97	/* This is neither a DOS MBR nor a DOS PBR */
	98	return -1;
	99	}
fe8c2806	100
084bf4c2	101	static int part_test_dos(struct blk_desc *dev_desc)
fe8c2806	102	{
3ea05205	103	#ifndef CONFIG_SPL_BUILD
7aed3d38 FA	104	ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr,
7aed3d38 FA	105	DIV_ROUND_UP(dev_desc->blksz, sizeof(legacy_mbr)));
fe8c2806	106
ff98cb90	107	if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1)
d1efb644 SW	108	return -1;
d1efb644 SW	109
ff98cb90	110	if (test_block_type((unsigned char *)mbr) != DOS_MBR)
d1efb644 SW	111	return -1;
d1efb644 SW	112
ff98cb90 PJ	113	if (dev_desc->sig_type == SIG_TYPE_NONE &&
	114	mbr->unique_mbr_signature != 0) {
	115	dev_desc->sig_type = SIG_TYPE_MBR;
	116	dev_desc->mbr_sig = mbr->unique_mbr_signature;
	117	}
3ea05205 FE	118	#else
	119	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
	120
	121	if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1)
	122	return -1;
	123
	124	if (test_block_type(buffer) != DOS_MBR)
	125	return -1;
	126	#endif
ff98cb90	127
d1efb644	128	return 0;
fe8c2806 WD	129	}
	130
	131	/* Print a partition that is relative to its Extended partition table
	132	*/
4101f687	133	static void print_partition_extended(struct blk_desc *dev_desc,
d29892ba SM	134	lbaint_t ext_part_sector,
d29892ba SM	135	lbaint_t relative,
e2e9b378	136	int part_num, unsigned int disksig)
fe8c2806	137	{
dec049d9	138	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
fe8c2806 WD	139	dos_partition_t *pt;
	140	int i;
	141
232e2f4f PE	142	/* set a maximum recursion level */
	143	if (part_num > MAX_EXT_PARTS)
	144	{
	145	printf(" Nested DOS partitions detected, stopping \n");
	146	return;
	147	}
	148
2a981dc2	149	if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
d29892ba	150	printf (" Can't read partition table on %d:" LBAFU " \n",
bcce53d0	151	dev_desc->devnum, ext_part_sector);
fe8c2806 WD	152	return;
fe8c2806 WD	153	}
7205e407	154	i=test_block_type(buffer);
d1efb644	155	if (i != DOS_MBR) {
fe8c2806 WD	156	printf ("bad MBR sector signature 0x%02x%02x\n",
	157	buffer[DOS_PART_MAGIC_OFFSET],
	158	buffer[DOS_PART_MAGIC_OFFSET + 1]);
	159	return;
	160	}
d1efb644	161
e2e9b378	162	if (!ext_part_sector)
97163dd1	163	disksig = get_unaligned_le32(&buffer[DOS_PART_DISKSIG_OFFSET]);
e2e9b378	164
fe8c2806 WD	165	/* Print all primary/logical partitions */
	166	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
	167	for (i = 0; i < 4; i++, pt++) {
	168	/*
8bde7f77	169	* fdisk does not show the extended partitions that
fe8c2806 WD	170	* are not in the MBR
	171	*/
	172
	173	if ((pt->sys_ind != 0) &&
	174	(ext_part_sector == 0 \|\| !is_extended (pt->sys_ind)) ) {
e2e9b378	175	print_one_part(pt, ext_part_sector, part_num, disksig);
fe8c2806 WD	176	}
	177
	178	/* Reverse engr the fdisk part# assignment rule! */
	179	if ((ext_part_sector == 0) \|\|
	180	(pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
	181	part_num++;
	182	}
	183	}
	184
	185	/* Follows the extended partitions */
	186	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
	187	for (i = 0; i < 4; i++, pt++) {
	188	if (is_extended (pt->sys_ind)) {
d29892ba	189	lbaint_t lba_start
97163dd1	190	= get_unaligned_le32 (pt->start4) + relative;
fe8c2806	191
304b5711 SW	192	print_partition_extended(dev_desc, lba_start,
304b5711 SW	193	ext_part_sector == 0 ? lba_start : relative,
e2e9b378	194	part_num, disksig);
fe8c2806 WD	195	}
	196	}
	197
	198	return;
	199	}
	200
	201
	202	/* Print a partition that is relative to its Extended partition table
	203	*/
3e8bd469 SG	204	static int part_get_info_extended(struct blk_desc *dev_desc,
	205	lbaint_t ext_part_sector, lbaint_t relative,
	206	int part_num, int which_part,
0528979f	207	struct disk_partition *info, uint disksig)
fe8c2806	208	{
dec049d9	209	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
fe8c2806 WD	210	dos_partition_t *pt;
fe8c2806 WD	211	int i;
4a36be9b	212	int dos_type;
fe8c2806	213
232e2f4f PE	214	/* set a maximum recursion level */
	215	if (part_num > MAX_EXT_PARTS)
	216	{
	217	printf(" Nested DOS partitions detected, stopping \n");
	218	return -1;
	219	}
	220
2a981dc2	221	if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
d29892ba	222	printf (" Can't read partition table on %d:" LBAFU " \n",
bcce53d0	223	dev_desc->devnum, ext_part_sector);
fe8c2806 WD	224	return -1;
	225	}
	226	if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 \|\|
	227	buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
	228	printf ("bad MBR sector signature 0x%02x%02x\n",
	229	buffer[DOS_PART_MAGIC_OFFSET],
	230	buffer[DOS_PART_MAGIC_OFFSET + 1]);
	231	return -1;
	232	}
	233
b331cd62	234	#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
d27b5f93	235	if (!ext_part_sector)
97163dd1	236	disksig = get_unaligned_le32(&buffer[DOS_PART_DISKSIG_OFFSET]);
d27b5f93 SW	237	#endif
d27b5f93 SW	238
fe8c2806 WD	239	/* Print all primary/logical partitions */
	240	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
	241	for (i = 0; i < 4; i++, pt++) {
	242	/*
8bde7f77 WD	243	* fdisk does not show the extended partitions that
8bde7f77 WD	244	* are not in the MBR
fe8c2806	245	*/
78f4ca79 DM	246	if (((pt->boot_ind & ~0x80) == 0) &&
78f4ca79 DM	247	(pt->sys_ind != 0) &&
7f70e853	248	(part_num == which_part) &&
8f7102cf	249	(ext_part_sector == 0 \|\| is_extended(pt->sys_ind) == 0)) {
4a36be9b	250	info->blksz = DOS_PART_DEFAULT_SECTOR;
e04350d2	251	info->start = (lbaint_t)(ext_part_sector +
97163dd1 MS	252	get_unaligned_le32(pt->start4));
97163dd1 MS	253	info->size = (lbaint_t)get_unaligned_le32(pt->size4);
da2ee24d PK	254	part_set_generic_name(dev_desc, part_num,
da2ee24d PK	255	(char *)info->name);
fe8c2806	256	/* sprintf(info->type, "%d, pt->sys_ind); */
192bc694	257	strcpy((char *)info->type, "U-Boot");
25801acc	258	info->bootable = get_bootable(pt);
b331cd62	259	#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
d27b5f93 SW	260	sprintf(info->uuid, "%08x-%02x", disksig, part_num);
d27b5f93 SW	261	#endif
f0fb4fa7	262	info->sys_ind = pt->sys_ind;
fe8c2806 WD	263	return 0;
	264	}
	265
	266	/* Reverse engr the fdisk part# assignment rule! */
	267	if ((ext_part_sector == 0) \|\|
	268	(pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
	269	part_num++;
	270	}
	271	}
	272
	273	/* Follows the extended partitions */
	274	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
	275	for (i = 0; i < 4; i++, pt++) {
	276	if (is_extended (pt->sys_ind)) {
d29892ba	277	lbaint_t lba_start
97163dd1	278	= get_unaligned_le32 (pt->start4) + relative;
fe8c2806	279
3e8bd469	280	return part_get_info_extended(dev_desc, lba_start,
fe8c2806	281	ext_part_sector == 0 ? lba_start : relative,
d27b5f93	282	part_num, which_part, info, disksig);
fe8c2806 WD	283	}
fe8c2806 WD	284	}
4a36be9b DD	285
	286	/* Check for DOS PBR if no partition is found */
	287	dos_type = test_block_type(buffer);
	288
	289	if (dos_type == DOS_PBR) {
	290	info->start = 0;
	291	info->size = dev_desc->lba;
	292	info->blksz = DOS_PART_DEFAULT_SECTOR;
	293	info->bootable = 0;
192bc694	294	strcpy((char *)info->type, "U-Boot");
b331cd62	295	#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
4a36be9b DD	296	info->uuid[0] = 0;
	297	#endif
	298	return 0;
	299	}
	300
fe8c2806 WD	301	return -1;
	302	}
	303
cb571f91	304	static void __maybe_unused part_print_dos(struct blk_desc *dev_desc)
fe8c2806	305	{
e2e9b378 SW	306	printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
e2e9b378 SW	307	print_partition_extended(dev_desc, 0, 0, 1, 0);
fe8c2806 WD	308	}
fe8c2806 WD	309
cb571f91	310	static int __maybe_unused part_get_info_dos(struct blk_desc *dev_desc, int part,
0528979f	311	struct disk_partition *info)
fe8c2806	312	{
3e8bd469	313	return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
fe8c2806 WD	314	}
fe8c2806 WD	315
b6dd69a4 PK	316	int is_valid_dos_buf(void *buf)
	317	{
	318	return test_block_type(buf) == DOS_MBR ? 0 : -1;
	319	}
	320
20bd5ac6 MS	321	#if CONFIG_IS_ENABLED(CMD_MBR)
	322	static void lba_to_chs(lbaint_t lba, unsigned char rc, unsigned char rh,
	323	unsigned char *rs)
	324	{
	325	unsigned int c, h, s;
	326	/* use fixed CHS geometry */
	327	unsigned int sectpertrack = 63;
	328	unsigned int heads = 255;
	329
	330	c = (lba + 1) / sectpertrack / heads;
	331	h = (lba + 1) / sectpertrack - c * heads;
	332	s = (lba + 1) - (c * heads + h) * sectpertrack;
	333
	334	if (c > 1023) {
	335	c = 1023;
	336	h = 254;
	337	s = 63;
	338	}
	339
	340	*rc = c & 0xff;
	341	*rh = h;
	342	*rs = s + ((c & 0x300) >> 2);
	343	}
	344
	345	static void mbr_fill_pt_entry(dos_partition_t *pt, lbaint_t start,
	346	lbaint_t relative, lbaint_t size, uchar sys_ind, bool bootable)
	347	{
	348	pt->boot_ind = bootable ? 0x80 : 0x00;
	349	pt->sys_ind = sys_ind;
	350	lba_to_chs(start, &pt->cyl, &pt->head, &pt->sector);
	351	lba_to_chs(start + size - 1, &pt->end_cyl, &pt->end_head, &pt->end_sector);
	352	put_unaligned_le32(relative, &pt->start4);
	353	put_unaligned_le32(size, &pt->size4);
	354	}
	355
	356	int write_mbr_partitions(struct blk_desc *dev,
	357	struct disk_partition *p, int count, unsigned int disksig)
	358	{
	359	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev->blksz);
	360	lbaint_t ext_part_start = 0, ext_part_size = 0, ext_part_sect = 0;
	361	dos_partition_t *pt;
	362	int i;
	363
	364	memset(buffer, 0, dev->blksz);
	365	buffer[DOS_PART_MAGIC_OFFSET] = 0x55;
	366	buffer[DOS_PART_MAGIC_OFFSET + 1] = 0xaa;
	367	put_unaligned_le32(disksig, &buffer[DOS_PART_DISKSIG_OFFSET]);
	368	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
	369
	370	/* create all primary partitions */
	371	for (i = 0; i < 4 && i < count; i++, pt++) {
	372	mbr_fill_pt_entry(pt, p[i].start, p[i].start, p[i].size,
	373	p[i].sys_ind, p[i].bootable);
	374	if (is_extended(p[i].sys_ind)) {
	375	ext_part_start = p[i].start;
	376	ext_part_size = p[i].size;
	377	ext_part_sect = p[i].start;
	378	}
	379	}
	380
	381	if (i < count && !ext_part_start) {
	382	printf("%s: extended partition is needed for more than 4 partitions\n",
	383	__func__);
	384	return -1;
385	}
386
387	/* write MBR */
388	if (blk_dwrite(dev, 0, 1, buffer) != 1) {
389	printf("%s: failed writing 'MBR' (1 blks at 0x0)\n",
390	__func__);
391	return -1;
392	}
393
394	/* create extended volumes */
395	for (; i < count; i++) {
396	lbaint_t next_ebr = 0;
397
398	memset(buffer, 0, dev->blksz);
399	buffer[DOS_PART_MAGIC_OFFSET] = 0x55;
400	buffer[DOS_PART_MAGIC_OFFSET + 1] = 0xaa;
401	pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
402
403	mbr_fill_pt_entry(pt, p[i].start, p[i].start - ext_part_sect,
404	p[i].size, p[i].sys_ind, p[i].bootable);
405
406	if (i + 1 < count) {
407	pt++;
408	next_ebr = p[i].start + p[i].size;
409	mbr_fill_pt_entry(pt, next_ebr,
410	next_ebr - ext_part_start,
411	p[i+1].start + p[i+1].size - next_ebr,
412	DOS_PART_TYPE_EXTENDED, 0);
413	}
414
415	/* write EBR */
416	if (blk_dwrite(dev, ext_part_sect, 1, buffer) != 1) {
417	printf("%s: failed writing 'EBR' (1 blks at 0x%lx)\n",
418	__func__, ext_part_sect);
419	return -1;
420	}
421	ext_part_sect = next_ebr;
422	}
423
f14c5ee5	424	/* Update the partition table entries*/
c7d1b189	425	part_init(dev);
f14c5ee5	426
20bd5ac6 MS	427	return 0;
	428	}
	429
	430	int layout_mbr_partitions(struct disk_partition *p, int count,
	431	lbaint_t total_sectors)
	432	{
	433	struct disk_partition *ext = NULL;
	434	int i, j;
	435	lbaint_t ext_vol_start;
	436
	437	/* calculate primary partitions start and size if needed */
	438	if (!p[0].start)
	439	p[0].start = DOS_PART_DEFAULT_GAP;
	440	for (i = 0; i < 4 && i < count; i++) {
	441	if (!p[i].start)
	442	p[i].start = p[i - 1].start + p[i - 1].size;
	443	if (!p[i].size) {
	444	lbaint_t end = total_sectors;
	445	lbaint_t allocated = 0;
	446
	447	for (j = i + 1; j < 4 && j < count; j++) {
	448	if (p[j].start) {
	449	end = p[j].start;
	450	break;
	451	}
	452	allocated += p[j].size;
	453	}
	454	p[i].size = end - allocated - p[i].start;
	455	}
	456	if (p[i].sys_ind == 0x05)
	457	ext = &p[i];
	458	}
	459
b7c2cc49 SG	460	if (count < 4)
	461	return 0;
	462
	463	if (!ext) {
	464	log_err("extended partition is needed for more than 4 partitions\n");
	465	return -EINVAL;
20bd5ac6 MS	466	}
	467
	468	/* calculate extended volumes start and size if needed */
	469	ext_vol_start = ext->start;
	470	for (i = 4; i < count; i++) {
	471	if (!p[i].start)
	472	p[i].start = ext_vol_start + DOS_PART_DEFAULT_GAP;
	473	if (!p[i].size) {
	474	lbaint_t end = ext->start + ext->size;
	475	lbaint_t allocated = 0;
	476
	477	for (j = i + 1; j < count; j++) {
	478	if (p[j].start) {
	479	end = p[j].start - DOS_PART_DEFAULT_GAP;
	480	break;
	481	}
	482	allocated += p[j].size + DOS_PART_DEFAULT_GAP;
	483	}
	484	p[i].size = end - allocated - p[i].start;
	485	}
	486	ext_vol_start = p[i].start + p[i].size;
	487	}
	488
	489	return 0;
	490	}
	491	#endif
	492
92f1c89d	493	int write_mbr_sector(struct blk_desc dev_desc, void buf)
b6dd69a4 PK	494	{
	495	if (is_valid_dos_buf(buf))
	496	return -1;
	497
	498	/* write MBR */
	499	if (blk_dwrite(dev_desc, 0, 1, buf) != 1) {
	500	printf("%s: failed writing '%s' (1 blks at 0x0)\n",
	501	__func__, "MBR");
	502	return 1;
	503	}
	504
f14c5ee5 GB	505	/* Update the partition table entries*/
	506	part_init(dev_desc);
	507
b6dd69a4 PK	508	return 0;
	509	}
	510
96e5b03c SG	511	U_BOOT_PART_TYPE(dos) = {
	512	.name = "DOS",
	513	.part_type = PART_TYPE_DOS,
87b8530f	514	.max_entries = DOS_ENTRY_NUMBERS,
3e8bd469	515	.get_info = part_get_info_ptr(part_get_info_dos),
084bf4c2 SG	516	.print = part_print_ptr(part_print_dos),
084bf4c2 SG	517	.test = part_test_dos,
96e5b03c	518	};