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![Marek Szyprowski](/assets/img/avatar_default.png)
Add a code for creating and writing MBR partition layout. The code generates similar layout of EBRs (Exteneded Block Records) and logical volumes as Linux's fdisk utility. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
515 lines
13 KiB
C
515 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2001
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* Raymond Lo, lo@routefree.com
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*/
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/*
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* Support for harddisk partitions.
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*
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* To be compatible with LinuxPPC and Apple we use the standard Apple
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* SCSI disk partitioning scheme. For more information see:
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* http://developer.apple.com/techpubs/mac/Devices/Devices-126.html#MARKER-14-92
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*/
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#include <common.h>
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#include <blk.h>
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#include <command.h>
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#include <ide.h>
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#include <memalign.h>
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#include <asm/unaligned.h>
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#include <linux/compiler.h>
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#include "part_dos.h"
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#include <part.h>
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#ifdef CONFIG_HAVE_BLOCK_DEVICE
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#define DOS_PART_DEFAULT_SECTOR 512
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/* should this be configurable? It looks like it's not very common at all
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* to use large numbers of partitions */
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#define MAX_EXT_PARTS 256
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static inline int is_extended(int part_type)
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{
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return (part_type == DOS_PART_TYPE_EXTENDED ||
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part_type == DOS_PART_TYPE_EXTENDED_LBA ||
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part_type == DOS_PART_TYPE_EXTENDED_LINUX);
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}
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static int get_bootable(dos_partition_t *p)
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{
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int ret = 0;
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if (p->sys_ind == 0xef)
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ret |= PART_EFI_SYSTEM_PARTITION;
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if (p->boot_ind == 0x80)
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ret |= PART_BOOTABLE;
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return ret;
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}
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static void print_one_part(dos_partition_t *p, lbaint_t ext_part_sector,
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int part_num, unsigned int disksig)
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{
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lbaint_t lba_start = ext_part_sector + get_unaligned_le32(p->start4);
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lbaint_t lba_size = get_unaligned_le32(p->size4);
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printf("%3d\t%-10" LBAFlength "u\t%-10" LBAFlength
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"u\t%08x-%02x\t%02x%s%s\n",
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part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
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(is_extended(p->sys_ind) ? " Extd" : ""),
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(get_bootable(p) ? " Boot" : ""));
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}
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static int test_block_type(unsigned char *buffer)
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{
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int slot;
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struct dos_partition *p;
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int part_count = 0;
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if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
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(buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
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return (-1);
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} /* no DOS Signature at all */
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p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET];
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/* Check that the boot indicators are valid and count the partitions. */
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for (slot = 0; slot < 4; ++slot, ++p) {
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if (p->boot_ind != 0 && p->boot_ind != 0x80)
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break;
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if (p->sys_ind)
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++part_count;
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}
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/*
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* If the partition table is invalid or empty,
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* check if this is a DOS PBR
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*/
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if (slot != 4 || !part_count) {
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if (!strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
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"FAT", 3) ||
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!strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
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"FAT32", 5))
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return DOS_PBR; /* This is a DOS PBR and not an MBR */
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}
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if (slot == 4)
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return DOS_MBR; /* This is an DOS MBR */
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/* This is neither a DOS MBR nor a DOS PBR */
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return -1;
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}
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static int part_test_dos(struct blk_desc *dev_desc)
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{
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#ifndef CONFIG_SPL_BUILD
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ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr,
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DIV_ROUND_UP(dev_desc->blksz, sizeof(legacy_mbr)));
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if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1)
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return -1;
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if (test_block_type((unsigned char *)mbr) != DOS_MBR)
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return -1;
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if (dev_desc->sig_type == SIG_TYPE_NONE &&
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mbr->unique_mbr_signature != 0) {
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dev_desc->sig_type = SIG_TYPE_MBR;
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dev_desc->mbr_sig = mbr->unique_mbr_signature;
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}
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#else
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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)
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return -1;
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if (test_block_type(buffer) != DOS_MBR)
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return -1;
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#endif
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return 0;
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}
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/* Print a partition that is relative to its Extended partition table
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*/
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static void print_partition_extended(struct blk_desc *dev_desc,
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lbaint_t ext_part_sector,
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lbaint_t 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;
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int i;
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/* set a maximum recursion level */
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if (part_num > MAX_EXT_PARTS)
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{
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printf("** Nested DOS partitions detected, stopping **\n");
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return;
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}
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if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
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printf ("** Can't read partition table on %d:" LBAFU " **\n",
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dev_desc->devnum, ext_part_sector);
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return;
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}
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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",
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buffer[DOS_PART_MAGIC_OFFSET],
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buffer[DOS_PART_MAGIC_OFFSET + 1]);
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return;
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}
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if (!ext_part_sector)
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disksig = get_unaligned_le32(&buffer[DOS_PART_DISKSIG_OFFSET]);
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/* Print all primary/logical partitions */
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pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
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for (i = 0; i < 4; i++, pt++) {
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/*
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* fdisk does not show the extended partitions that
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* are not in the MBR
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*/
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if ((pt->sys_ind != 0) &&
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(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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}
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/* Reverse engr the fdisk part# assignment rule! */
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if ((ext_part_sector == 0) ||
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(pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
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part_num++;
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}
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}
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/* Follows the extended partitions */
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pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
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for (i = 0; i < 4; i++, pt++) {
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if (is_extended (pt->sys_ind)) {
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lbaint_t lba_start
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= get_unaligned_le32 (pt->start4) + relative;
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print_partition_extended(dev_desc, lba_start,
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ext_part_sector == 0 ? lba_start : relative,
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part_num, disksig);
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}
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}
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return;
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}
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/* Print a partition that is relative to its Extended partition table
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*/
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static int part_get_info_extended(struct blk_desc *dev_desc,
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lbaint_t ext_part_sector, lbaint_t relative,
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int part_num, int which_part,
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struct disk_partition *info, uint 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;
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int i;
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int dos_type;
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/* set a maximum recursion level */
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if (part_num > MAX_EXT_PARTS)
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{
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printf("** Nested DOS partitions detected, stopping **\n");
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return -1;
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}
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if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
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printf ("** Can't read partition table on %d:" LBAFU " **\n",
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dev_desc->devnum, ext_part_sector);
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return -1;
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}
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if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
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buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
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printf ("bad MBR sector signature 0x%02x%02x\n",
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buffer[DOS_PART_MAGIC_OFFSET],
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buffer[DOS_PART_MAGIC_OFFSET + 1]);
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return -1;
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}
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#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
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if (!ext_part_sector)
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disksig = get_unaligned_le32(&buffer[DOS_PART_DISKSIG_OFFSET]);
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#endif
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/* Print all primary/logical partitions */
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pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
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for (i = 0; i < 4; i++, pt++) {
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/*
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* fdisk does not show the extended partitions that
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* are not in the MBR
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*/
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if (((pt->boot_ind & ~0x80) == 0) &&
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(pt->sys_ind != 0) &&
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(part_num == which_part) &&
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(ext_part_sector == 0 || 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 +
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get_unaligned_le32(pt->start4));
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info->size = (lbaint_t)get_unaligned_le32(pt->size4);
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part_set_generic_name(dev_desc, part_num,
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(char *)info->name);
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/* sprintf(info->type, "%d, pt->sys_ind); */
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strcpy((char *)info->type, "U-Boot");
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info->bootable = get_bootable(pt);
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#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
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sprintf(info->uuid, "%08x-%02x", disksig, part_num);
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#endif
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info->sys_ind = pt->sys_ind;
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return 0;
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}
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/* Reverse engr the fdisk part# assignment rule! */
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if ((ext_part_sector == 0) ||
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(pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
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part_num++;
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}
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}
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/* Follows the extended partitions */
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pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
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for (i = 0; i < 4; i++, pt++) {
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if (is_extended (pt->sys_ind)) {
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lbaint_t lba_start
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= get_unaligned_le32 (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,
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part_num, which_part, info, disksig);
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}
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}
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/* Check for DOS PBR if no partition is found */
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dos_type = test_block_type(buffer);
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if (dos_type == DOS_PBR) {
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info->start = 0;
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info->size = dev_desc->lba;
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info->blksz = DOS_PART_DEFAULT_SECTOR;
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info->bootable = 0;
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strcpy((char *)info->type, "U-Boot");
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#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
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info->uuid[0] = 0;
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#endif
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return 0;
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}
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return -1;
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}
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static void __maybe_unused part_print_dos(struct blk_desc *dev_desc)
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{
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printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
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print_partition_extended(dev_desc, 0, 0, 1, 0);
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}
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static int __maybe_unused part_get_info_dos(struct blk_desc *dev_desc, int part,
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struct disk_partition *info)
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{
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return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
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}
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int is_valid_dos_buf(void *buf)
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{
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return test_block_type(buf) == DOS_MBR ? 0 : -1;
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}
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#if CONFIG_IS_ENABLED(CMD_MBR)
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static void lba_to_chs(lbaint_t lba, unsigned char *rc, unsigned char *rh,
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unsigned char *rs)
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{
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unsigned int c, h, s;
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/* use fixed CHS geometry */
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unsigned int sectpertrack = 63;
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unsigned int heads = 255;
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c = (lba + 1) / sectpertrack / heads;
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h = (lba + 1) / sectpertrack - c * heads;
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s = (lba + 1) - (c * heads + h) * sectpertrack;
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if (c > 1023) {
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c = 1023;
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h = 254;
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s = 63;
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}
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*rc = c & 0xff;
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*rh = h;
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*rs = s + ((c & 0x300) >> 2);
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}
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static void mbr_fill_pt_entry(dos_partition_t *pt, lbaint_t start,
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lbaint_t relative, lbaint_t size, uchar sys_ind, bool bootable)
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{
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pt->boot_ind = bootable ? 0x80 : 0x00;
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pt->sys_ind = sys_ind;
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lba_to_chs(start, &pt->cyl, &pt->head, &pt->sector);
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lba_to_chs(start + size - 1, &pt->end_cyl, &pt->end_head, &pt->end_sector);
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put_unaligned_le32(relative, &pt->start4);
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put_unaligned_le32(size, &pt->size4);
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}
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int write_mbr_partitions(struct blk_desc *dev,
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struct disk_partition *p, int count, unsigned int disksig)
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{
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ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev->blksz);
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lbaint_t ext_part_start = 0, ext_part_size = 0, ext_part_sect = 0;
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dos_partition_t *pt;
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int i;
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memset(buffer, 0, dev->blksz);
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buffer[DOS_PART_MAGIC_OFFSET] = 0x55;
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buffer[DOS_PART_MAGIC_OFFSET + 1] = 0xaa;
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put_unaligned_le32(disksig, &buffer[DOS_PART_DISKSIG_OFFSET]);
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pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
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/* create all primary partitions */
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for (i = 0; i < 4 && i < count; i++, pt++) {
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mbr_fill_pt_entry(pt, p[i].start, p[i].start, p[i].size,
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p[i].sys_ind, p[i].bootable);
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if (is_extended(p[i].sys_ind)) {
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ext_part_start = p[i].start;
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ext_part_size = p[i].size;
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ext_part_sect = p[i].start;
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}
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}
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if (i < count && !ext_part_start) {
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printf("%s: extended partition is needed for more than 4 partitions\n",
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__func__);
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return -1;
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}
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/* write MBR */
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if (blk_dwrite(dev, 0, 1, buffer) != 1) {
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printf("%s: failed writing 'MBR' (1 blks at 0x0)\n",
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__func__);
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return -1;
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}
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/* create extended volumes */
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for (; i < count; i++) {
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lbaint_t next_ebr = 0;
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memset(buffer, 0, dev->blksz);
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buffer[DOS_PART_MAGIC_OFFSET] = 0x55;
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buffer[DOS_PART_MAGIC_OFFSET + 1] = 0xaa;
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pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
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mbr_fill_pt_entry(pt, p[i].start, p[i].start - ext_part_sect,
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p[i].size, p[i].sys_ind, p[i].bootable);
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if (i + 1 < count) {
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pt++;
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next_ebr = p[i].start + p[i].size;
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mbr_fill_pt_entry(pt, next_ebr,
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next_ebr - ext_part_start,
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p[i+1].start + p[i+1].size - next_ebr,
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DOS_PART_TYPE_EXTENDED, 0);
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}
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/* write EBR */
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if (blk_dwrite(dev, ext_part_sect, 1, buffer) != 1) {
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printf("%s: failed writing 'EBR' (1 blks at 0x%lx)\n",
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__func__, ext_part_sect);
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return -1;
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}
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ext_part_sect = next_ebr;
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}
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return 0;
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}
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int layout_mbr_partitions(struct disk_partition *p, int count,
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lbaint_t total_sectors)
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{
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struct disk_partition *ext = NULL;
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int i, j;
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lbaint_t ext_vol_start;
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/* calculate primary partitions start and size if needed */
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if (!p[0].start)
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p[0].start = DOS_PART_DEFAULT_GAP;
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for (i = 0; i < 4 && i < count; i++) {
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if (!p[i].start)
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p[i].start = p[i - 1].start + p[i - 1].size;
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if (!p[i].size) {
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lbaint_t end = total_sectors;
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lbaint_t allocated = 0;
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for (j = i + 1; j < 4 && j < count; j++) {
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if (p[j].start) {
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end = p[j].start;
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break;
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}
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allocated += p[j].size;
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}
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p[i].size = end - allocated - p[i].start;
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}
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if (p[i].sys_ind == 0x05)
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ext = &p[i];
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}
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if (i >= 4 && !ext) {
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printf("%s: extended partition is needed for more than 4 partitions\n",
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__func__);
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return -1;
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}
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/* calculate extended volumes start and size if needed */
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ext_vol_start = ext->start;
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for (i = 4; i < count; i++) {
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if (!p[i].start)
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p[i].start = ext_vol_start + DOS_PART_DEFAULT_GAP;
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if (!p[i].size) {
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lbaint_t end = ext->start + ext->size;
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lbaint_t allocated = 0;
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for (j = i + 1; j < count; j++) {
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if (p[j].start) {
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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;
|
|
}
|
|
|
|
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,
|
|
};
|
|
|
|
#endif
|