1 // SPDX-License-Identifier: GPL-2.0+
9 * Support for harddisk partitions.
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
22 #ifdef CONFIG_HAVE_BLOCK_DEVICE
24 #define DOS_PART_DEFAULT_SECTOR 512
26 /* should this be configurable? It looks like it's not very common at all
27 * to use large numbers of partitions */
28 #define MAX_EXT_PARTS 256
30 /* Convert char[4] in little endian format to the host format integer
32 static inline unsigned int le32_to_int(unsigned char *le32)
34 return ((le32[3] << 24) +
41 static inline int is_extended(int part_type)
43 return (part_type == 0x5 ||
48 static int get_bootable(dos_partition_t *p)
52 if (p->sys_ind == 0xef)
53 ret |= PART_EFI_SYSTEM_PARTITION;
54 if (p->boot_ind == 0x80)
59 static void print_one_part(dos_partition_t *p, lbaint_t ext_part_sector,
60 int part_num, unsigned int disksig)
62 lbaint_t lba_start = ext_part_sector + le32_to_int (p->start4);
63 lbaint_t lba_size = le32_to_int (p->size4);
65 printf("%3d\t%-10" LBAFlength "u\t%-10" LBAFlength
66 "u\t%08x-%02x\t%02x%s%s\n",
67 part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
68 (is_extended(p->sys_ind) ? " Extd" : ""),
69 (get_bootable(p) ? " Boot" : ""));
72 static int test_block_type(unsigned char *buffer)
75 struct dos_partition *p;
78 if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
79 (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
81 } /* no DOS Signature at all */
82 p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET];
84 /* Check that the boot indicators are valid and count the partitions. */
85 for (slot = 0; slot < 4; ++slot, ++p) {
86 if (p->boot_ind != 0 && p->boot_ind != 0x80)
93 * If the partition table is invalid or empty,
94 * check if this is a DOS PBR
96 if (slot != 4 || !part_count) {
97 if (!strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
99 !strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
101 return DOS_PBR; /* This is a DOS PBR and not an MBR */
104 return DOS_MBR; /* This is an DOS MBR */
106 /* This is neither a DOS MBR nor a DOS PBR */
110 static int part_test_dos(struct blk_desc *dev_desc)
112 #ifndef CONFIG_SPL_BUILD
113 ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr,
114 DIV_ROUND_UP(dev_desc->blksz, sizeof(legacy_mbr)));
116 if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1)
119 if (test_block_type((unsigned char *)mbr) != DOS_MBR)
122 if (dev_desc->sig_type == SIG_TYPE_NONE &&
123 mbr->unique_mbr_signature != 0) {
124 dev_desc->sig_type = SIG_TYPE_MBR;
125 dev_desc->mbr_sig = mbr->unique_mbr_signature;
128 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
130 if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1)
133 if (test_block_type(buffer) != DOS_MBR)
140 /* Print a partition that is relative to its Extended partition table
142 static void print_partition_extended(struct blk_desc *dev_desc,
143 lbaint_t ext_part_sector,
145 int part_num, unsigned int disksig)
147 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
151 /* set a maximum recursion level */
152 if (part_num > MAX_EXT_PARTS)
154 printf("** Nested DOS partitions detected, stopping **\n");
158 if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
159 printf ("** Can't read partition table on %d:" LBAFU " **\n",
160 dev_desc->devnum, ext_part_sector);
163 i=test_block_type(buffer);
165 printf ("bad MBR sector signature 0x%02x%02x\n",
166 buffer[DOS_PART_MAGIC_OFFSET],
167 buffer[DOS_PART_MAGIC_OFFSET + 1]);
171 if (!ext_part_sector)
172 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
174 /* Print all primary/logical partitions */
175 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
176 for (i = 0; i < 4; i++, pt++) {
178 * fdisk does not show the extended partitions that
182 if ((pt->sys_ind != 0) &&
183 (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
184 print_one_part(pt, ext_part_sector, part_num, disksig);
187 /* Reverse engr the fdisk part# assignment rule! */
188 if ((ext_part_sector == 0) ||
189 (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
194 /* Follows the extended partitions */
195 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
196 for (i = 0; i < 4; i++, pt++) {
197 if (is_extended (pt->sys_ind)) {
199 = le32_to_int (pt->start4) + relative;
201 print_partition_extended(dev_desc, lba_start,
202 ext_part_sector == 0 ? lba_start : relative,
211 /* Print a partition that is relative to its Extended partition table
213 static int part_get_info_extended(struct blk_desc *dev_desc,
214 lbaint_t ext_part_sector, lbaint_t relative,
215 int part_num, int which_part,
216 disk_partition_t *info, unsigned int disksig)
218 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
223 /* set a maximum recursion level */
224 if (part_num > MAX_EXT_PARTS)
226 printf("** Nested DOS partitions detected, stopping **\n");
230 if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
231 printf ("** Can't read partition table on %d:" LBAFU " **\n",
232 dev_desc->devnum, ext_part_sector);
235 if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
236 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
237 printf ("bad MBR sector signature 0x%02x%02x\n",
238 buffer[DOS_PART_MAGIC_OFFSET],
239 buffer[DOS_PART_MAGIC_OFFSET + 1]);
243 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
244 if (!ext_part_sector)
245 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
248 /* Print all primary/logical partitions */
249 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
250 for (i = 0; i < 4; i++, pt++) {
252 * fdisk does not show the extended partitions that
255 if (((pt->boot_ind & ~0x80) == 0) &&
256 (pt->sys_ind != 0) &&
257 (part_num == which_part) &&
258 (ext_part_sector == 0 || is_extended(pt->sys_ind) == 0)) {
259 info->blksz = DOS_PART_DEFAULT_SECTOR;
260 info->start = (lbaint_t)(ext_part_sector +
261 le32_to_int(pt->start4));
262 info->size = (lbaint_t)le32_to_int(pt->size4);
263 part_set_generic_name(dev_desc, part_num,
265 /* sprintf(info->type, "%d, pt->sys_ind); */
266 strcpy((char *)info->type, "U-Boot");
267 info->bootable = get_bootable(pt);
268 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
269 sprintf(info->uuid, "%08x-%02x", disksig, part_num);
271 info->sys_ind = pt->sys_ind;
275 /* Reverse engr the fdisk part# assignment rule! */
276 if ((ext_part_sector == 0) ||
277 (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
282 /* Follows the extended partitions */
283 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
284 for (i = 0; i < 4; i++, pt++) {
285 if (is_extended (pt->sys_ind)) {
287 = le32_to_int (pt->start4) + relative;
289 return part_get_info_extended(dev_desc, lba_start,
290 ext_part_sector == 0 ? lba_start : relative,
291 part_num, which_part, info, disksig);
295 /* Check for DOS PBR if no partition is found */
296 dos_type = test_block_type(buffer);
298 if (dos_type == DOS_PBR) {
300 info->size = dev_desc->lba;
301 info->blksz = DOS_PART_DEFAULT_SECTOR;
303 strcpy((char *)info->type, "U-Boot");
304 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
313 void part_print_dos(struct blk_desc *dev_desc)
315 printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
316 print_partition_extended(dev_desc, 0, 0, 1, 0);
319 int part_get_info_dos(struct blk_desc *dev_desc, int part,
320 disk_partition_t *info)
322 return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
325 int is_valid_dos_buf(void *buf)
327 return test_block_type(buf) == DOS_MBR ? 0 : -1;
330 int write_mbr_partition(struct blk_desc *dev_desc, void *buf)
332 if (is_valid_dos_buf(buf))
336 if (blk_dwrite(dev_desc, 0, 1, buf) != 1) {
337 printf("%s: failed writing '%s' (1 blks at 0x0)\n",
345 U_BOOT_PART_TYPE(dos) = {
347 .part_type = PART_TYPE_DOS,
348 .max_entries = DOS_ENTRY_NUMBERS,
349 .get_info = part_get_info_ptr(part_get_info_dos),
350 .print = part_print_ptr(part_print_dos),
351 .test = part_test_dos,