1 // SPDX-License-Identifier: GPL-2.0+
4 * Raymond Lo, lo@routefree.com
5 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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
21 #include <asm/unaligned.h>
22 #include <linux/compiler.h>
26 #define DOS_PART_DEFAULT_SECTOR 512
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
32 static inline int is_extended(int part_type)
34 return (part_type == DOS_PART_TYPE_EXTENDED ||
35 part_type == DOS_PART_TYPE_EXTENDED_LBA ||
36 part_type == DOS_PART_TYPE_EXTENDED_LINUX);
39 static int get_bootable(dos_partition_t *p)
43 if (p->sys_ind == 0xef)
44 ret |= PART_EFI_SYSTEM_PARTITION;
45 if (p->boot_ind == 0x80)
50 static void print_one_part(dos_partition_t *p, lbaint_t ext_part_sector,
51 int part_num, unsigned int disksig)
53 lbaint_t lba_start = ext_part_sector + get_unaligned_le32(p->start4);
54 lbaint_t lba_size = get_unaligned_le32(p->size4);
56 printf("%3d\t%-10" LBAFlength "u\t%-10" LBAFlength
57 "u\t%08x-%02x\t%02x%s%s\n",
58 part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
59 (is_extended(p->sys_ind) ? " Extd" : ""),
60 (get_bootable(p) ? " Boot" : ""));
63 static int test_block_type(unsigned char *buffer)
66 struct dos_partition *p;
69 if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
70 (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
72 } /* no DOS Signature at all */
73 p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET];
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)
84 * If the partition table is invalid or empty,
85 * check if this is a DOS PBR
87 if (slot != 4 || !part_count) {
88 if (!strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
90 !strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
92 return DOS_PBR; /* This is a DOS PBR and not an MBR */
95 return DOS_MBR; /* This is an DOS MBR */
97 /* This is neither a DOS MBR nor a DOS PBR */
101 static int part_test_dos(struct blk_desc *dev_desc)
103 #ifndef CONFIG_SPL_BUILD
104 ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr,
105 DIV_ROUND_UP(dev_desc->blksz, sizeof(legacy_mbr)));
107 if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1)
110 if (test_block_type((unsigned char *)mbr) != DOS_MBR)
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;
119 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
121 if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1)
124 if (test_block_type(buffer) != DOS_MBR)
131 /* Print a partition that is relative to its Extended partition table
133 static void print_partition_extended(struct blk_desc *dev_desc,
134 lbaint_t ext_part_sector,
136 int part_num, unsigned int disksig)
138 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
142 /* set a maximum recursion level */
143 if (part_num > MAX_EXT_PARTS)
145 printf("** Nested DOS partitions detected, stopping **\n");
149 if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
150 printf ("** Can't read partition table on %d:" LBAFU " **\n",
151 dev_desc->devnum, ext_part_sector);
154 i=test_block_type(buffer);
156 printf ("bad MBR sector signature 0x%02x%02x\n",
157 buffer[DOS_PART_MAGIC_OFFSET],
158 buffer[DOS_PART_MAGIC_OFFSET + 1]);
162 if (!ext_part_sector)
163 disksig = get_unaligned_le32(&buffer[DOS_PART_DISKSIG_OFFSET]);
165 /* Print all primary/logical partitions */
166 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
167 for (i = 0; i < 4; i++, pt++) {
169 * fdisk does not show the extended partitions that
173 if ((pt->sys_ind != 0) &&
174 (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
175 print_one_part(pt, ext_part_sector, part_num, disksig);
178 /* Reverse engr the fdisk part# assignment rule! */
179 if ((ext_part_sector == 0) ||
180 (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
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)) {
190 = get_unaligned_le32 (pt->start4) + relative;
192 print_partition_extended(dev_desc, lba_start,
193 ext_part_sector == 0 ? lba_start : relative,
202 /* Print a partition that is relative to its Extended partition table
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,
207 struct disk_partition *info, uint disksig)
209 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
214 /* set a maximum recursion level */
215 if (part_num > MAX_EXT_PARTS)
217 printf("** Nested DOS partitions detected, stopping **\n");
221 if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
222 printf ("** Can't read partition table on %d:" LBAFU " **\n",
223 dev_desc->devnum, ext_part_sector);
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]);
234 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
235 if (!ext_part_sector)
236 disksig = get_unaligned_le32(&buffer[DOS_PART_DISKSIG_OFFSET]);
239 /* Print all primary/logical partitions */
240 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
241 for (i = 0; i < 4; i++, pt++) {
243 * fdisk does not show the extended partitions that
246 if (((pt->boot_ind & ~0x80) == 0) &&
247 (pt->sys_ind != 0) &&
248 (part_num == which_part) &&
249 (ext_part_sector == 0 || is_extended(pt->sys_ind) == 0)) {
250 info->blksz = DOS_PART_DEFAULT_SECTOR;
251 info->start = (lbaint_t)(ext_part_sector +
252 get_unaligned_le32(pt->start4));
253 info->size = (lbaint_t)get_unaligned_le32(pt->size4);
254 part_set_generic_name(dev_desc, part_num,
256 /* sprintf(info->type, "%d, pt->sys_ind); */
257 strcpy((char *)info->type, "U-Boot");
258 info->bootable = get_bootable(pt);
259 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
260 sprintf(info->uuid, "%08x-%02x", disksig, part_num);
262 info->sys_ind = pt->sys_ind;
266 /* Reverse engr the fdisk part# assignment rule! */
267 if ((ext_part_sector == 0) ||
268 (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
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)) {
278 = get_unaligned_le32 (pt->start4) + relative;
280 return part_get_info_extended(dev_desc, lba_start,
281 ext_part_sector == 0 ? lba_start : relative,
282 part_num, which_part, info, disksig);
286 /* Check for DOS PBR if no partition is found */
287 dos_type = test_block_type(buffer);
289 if (dos_type == DOS_PBR) {
291 info->size = dev_desc->lba;
292 info->blksz = DOS_PART_DEFAULT_SECTOR;
294 strcpy((char *)info->type, "U-Boot");
295 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
304 static void __maybe_unused part_print_dos(struct blk_desc *dev_desc)
306 printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
307 print_partition_extended(dev_desc, 0, 0, 1, 0);
310 static int __maybe_unused part_get_info_dos(struct blk_desc *dev_desc, int part,
311 struct disk_partition *info)
313 return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
316 int is_valid_dos_buf(void *buf)
318 return test_block_type(buf) == DOS_MBR ? 0 : -1;
321 #if CONFIG_IS_ENABLED(CMD_MBR)
322 static void lba_to_chs(lbaint_t lba, unsigned char *rc, unsigned char *rh,
325 unsigned int c, h, s;
326 /* use fixed CHS geometry */
327 unsigned int sectpertrack = 63;
328 unsigned int heads = 255;
330 c = (lba + 1) / sectpertrack / heads;
331 h = (lba + 1) / sectpertrack - c * heads;
332 s = (lba + 1) - (c * heads + h) * sectpertrack;
342 *rs = s + ((c & 0x300) >> 2);
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)
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);
356 int write_mbr_partitions(struct blk_desc *dev,
357 struct disk_partition *p, int count, unsigned int disksig)
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;
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);
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;
381 if (i < count && !ext_part_start) {
382 printf("%s: extended partition is needed for more than 4 partitions\n",
388 if (blk_dwrite(dev, 0, 1, buffer) != 1) {
389 printf("%s: failed writing 'MBR' (1 blks at 0x0)\n",
394 /* create extended volumes */
395 for (; i < count; i++) {
396 lbaint_t next_ebr = 0;
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);
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);
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);
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);
421 ext_part_sect = next_ebr;
424 /* Update the partition table entries*/
430 int layout_mbr_partitions(struct disk_partition *p, int count,
431 lbaint_t total_sectors)
433 struct disk_partition *ext = NULL;
435 lbaint_t ext_vol_start;
437 /* calculate primary partitions start and size if needed */
439 p[0].start = DOS_PART_DEFAULT_GAP;
440 for (i = 0; i < 4 && i < count; i++) {
442 p[i].start = p[i - 1].start + p[i - 1].size;
444 lbaint_t end = total_sectors;
445 lbaint_t allocated = 0;
447 for (j = i + 1; j < 4 && j < count; j++) {
452 allocated += p[j].size;
454 p[i].size = end - allocated - p[i].start;
456 if (p[i].sys_ind == 0x05)
464 log_err("extended partition is needed for more than 4 partitions\n");
468 /* calculate extended volumes start and size if needed */
469 ext_vol_start = ext->start;
470 for (i = 4; i < count; i++) {
472 p[i].start = ext_vol_start + DOS_PART_DEFAULT_GAP;
474 lbaint_t end = ext->start + ext->size;
475 lbaint_t allocated = 0;
477 for (j = i + 1; j < count; j++) {
479 end = p[j].start - DOS_PART_DEFAULT_GAP;
482 allocated += p[j].size + DOS_PART_DEFAULT_GAP;
484 p[i].size = end - allocated - p[i].start;
486 ext_vol_start = p[i].start + p[i].size;
493 int write_mbr_sector(struct blk_desc *dev_desc, void *buf)
495 if (is_valid_dos_buf(buf))
499 if (blk_dwrite(dev_desc, 0, 1, buf) != 1) {
500 printf("%s: failed writing '%s' (1 blks at 0x0)\n",
505 /* Update the partition table entries*/
511 U_BOOT_PART_TYPE(dos) = {
513 .part_type = PART_TYPE_DOS,
514 .max_entries = DOS_ENTRY_NUMBERS,
515 .get_info = part_get_info_ptr(part_get_info_dos),
516 .print = part_print_ptr(part_print_dos),
517 .test = part_test_dos,