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 #ifdef CONFIG_HAVE_BLOCK_DEVICE
28 #define DOS_PART_DEFAULT_SECTOR 512
30 /* should this be configurable? It looks like it's not very common at all
31 * to use large numbers of partitions */
32 #define MAX_EXT_PARTS 256
34 static inline int is_extended(int part_type)
36 return (part_type == DOS_PART_TYPE_EXTENDED ||
37 part_type == DOS_PART_TYPE_EXTENDED_LBA ||
38 part_type == DOS_PART_TYPE_EXTENDED_LINUX);
41 static int get_bootable(dos_partition_t *p)
45 if (p->sys_ind == 0xef)
46 ret |= PART_EFI_SYSTEM_PARTITION;
47 if (p->boot_ind == 0x80)
52 static void print_one_part(dos_partition_t *p, lbaint_t ext_part_sector,
53 int part_num, unsigned int disksig)
55 lbaint_t lba_start = ext_part_sector + get_unaligned_le32(p->start4);
56 lbaint_t lba_size = get_unaligned_le32(p->size4);
58 printf("%3d\t%-10" LBAFlength "u\t%-10" LBAFlength
59 "u\t%08x-%02x\t%02x%s%s\n",
60 part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
61 (is_extended(p->sys_ind) ? " Extd" : ""),
62 (get_bootable(p) ? " Boot" : ""));
65 static int test_block_type(unsigned char *buffer)
68 struct dos_partition *p;
71 if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
72 (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
74 } /* no DOS Signature at all */
75 p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET];
77 /* Check that the boot indicators are valid and count the partitions. */
78 for (slot = 0; slot < 4; ++slot, ++p) {
79 if (p->boot_ind != 0 && p->boot_ind != 0x80)
86 * If the partition table is invalid or empty,
87 * check if this is a DOS PBR
89 if (slot != 4 || !part_count) {
90 if (!strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
92 !strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
94 return DOS_PBR; /* This is a DOS PBR and not an MBR */
97 return DOS_MBR; /* This is an DOS MBR */
99 /* This is neither a DOS MBR nor a DOS PBR */
103 static int part_test_dos(struct blk_desc *dev_desc)
105 #ifndef CONFIG_SPL_BUILD
106 ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr,
107 DIV_ROUND_UP(dev_desc->blksz, sizeof(legacy_mbr)));
109 if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1)
112 if (test_block_type((unsigned char *)mbr) != DOS_MBR)
115 if (dev_desc->sig_type == SIG_TYPE_NONE &&
116 mbr->unique_mbr_signature != 0) {
117 dev_desc->sig_type = SIG_TYPE_MBR;
118 dev_desc->mbr_sig = mbr->unique_mbr_signature;
121 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
123 if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1)
126 if (test_block_type(buffer) != DOS_MBR)
133 /* Print a partition that is relative to its Extended partition table
135 static void print_partition_extended(struct blk_desc *dev_desc,
136 lbaint_t ext_part_sector,
138 int part_num, unsigned int disksig)
140 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
144 /* set a maximum recursion level */
145 if (part_num > MAX_EXT_PARTS)
147 printf("** Nested DOS partitions detected, stopping **\n");
151 if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
152 printf ("** Can't read partition table on %d:" LBAFU " **\n",
153 dev_desc->devnum, ext_part_sector);
156 i=test_block_type(buffer);
158 printf ("bad MBR sector signature 0x%02x%02x\n",
159 buffer[DOS_PART_MAGIC_OFFSET],
160 buffer[DOS_PART_MAGIC_OFFSET + 1]);
164 if (!ext_part_sector)
165 disksig = get_unaligned_le32(&buffer[DOS_PART_DISKSIG_OFFSET]);
167 /* Print all primary/logical partitions */
168 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
169 for (i = 0; i < 4; i++, pt++) {
171 * fdisk does not show the extended partitions that
175 if ((pt->sys_ind != 0) &&
176 (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
177 print_one_part(pt, ext_part_sector, part_num, disksig);
180 /* Reverse engr the fdisk part# assignment rule! */
181 if ((ext_part_sector == 0) ||
182 (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
187 /* Follows the extended partitions */
188 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
189 for (i = 0; i < 4; i++, pt++) {
190 if (is_extended (pt->sys_ind)) {
192 = get_unaligned_le32 (pt->start4) + relative;
194 print_partition_extended(dev_desc, lba_start,
195 ext_part_sector == 0 ? lba_start : relative,
204 /* Print a partition that is relative to its Extended partition table
206 static int part_get_info_extended(struct blk_desc *dev_desc,
207 lbaint_t ext_part_sector, lbaint_t relative,
208 int part_num, int which_part,
209 struct disk_partition *info, uint disksig)
211 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
216 /* set a maximum recursion level */
217 if (part_num > MAX_EXT_PARTS)
219 printf("** Nested DOS partitions detected, stopping **\n");
223 if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
224 printf ("** Can't read partition table on %d:" LBAFU " **\n",
225 dev_desc->devnum, ext_part_sector);
228 if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
229 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
230 printf ("bad MBR sector signature 0x%02x%02x\n",
231 buffer[DOS_PART_MAGIC_OFFSET],
232 buffer[DOS_PART_MAGIC_OFFSET + 1]);
236 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
237 if (!ext_part_sector)
238 disksig = get_unaligned_le32(&buffer[DOS_PART_DISKSIG_OFFSET]);
241 /* Print all primary/logical partitions */
242 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
243 for (i = 0; i < 4; i++, pt++) {
245 * fdisk does not show the extended partitions that
248 if (((pt->boot_ind & ~0x80) == 0) &&
249 (pt->sys_ind != 0) &&
250 (part_num == which_part) &&
251 (ext_part_sector == 0 || is_extended(pt->sys_ind) == 0)) {
252 info->blksz = DOS_PART_DEFAULT_SECTOR;
253 info->start = (lbaint_t)(ext_part_sector +
254 get_unaligned_le32(pt->start4));
255 info->size = (lbaint_t)get_unaligned_le32(pt->size4);
256 part_set_generic_name(dev_desc, part_num,
258 /* sprintf(info->type, "%d, pt->sys_ind); */
259 strcpy((char *)info->type, "U-Boot");
260 info->bootable = get_bootable(pt);
261 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
262 sprintf(info->uuid, "%08x-%02x", disksig, part_num);
264 info->sys_ind = pt->sys_ind;
268 /* Reverse engr the fdisk part# assignment rule! */
269 if ((ext_part_sector == 0) ||
270 (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
275 /* Follows the extended partitions */
276 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
277 for (i = 0; i < 4; i++, pt++) {
278 if (is_extended (pt->sys_ind)) {
280 = get_unaligned_le32 (pt->start4) + relative;
282 return part_get_info_extended(dev_desc, lba_start,
283 ext_part_sector == 0 ? lba_start : relative,
284 part_num, which_part, info, disksig);
288 /* Check for DOS PBR if no partition is found */
289 dos_type = test_block_type(buffer);
291 if (dos_type == DOS_PBR) {
293 info->size = dev_desc->lba;
294 info->blksz = DOS_PART_DEFAULT_SECTOR;
296 strcpy((char *)info->type, "U-Boot");
297 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
306 static void __maybe_unused part_print_dos(struct blk_desc *dev_desc)
308 printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
309 print_partition_extended(dev_desc, 0, 0, 1, 0);
312 static int __maybe_unused part_get_info_dos(struct blk_desc *dev_desc, int part,
313 struct disk_partition *info)
315 return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
318 int is_valid_dos_buf(void *buf)
320 return test_block_type(buf) == DOS_MBR ? 0 : -1;
323 int write_mbr_sector(struct blk_desc *dev_desc, void *buf)
325 if (is_valid_dos_buf(buf))
329 if (blk_dwrite(dev_desc, 0, 1, buf) != 1) {
330 printf("%s: failed writing '%s' (1 blks at 0x0)\n",
338 U_BOOT_PART_TYPE(dos) = {
340 .part_type = PART_TYPE_DOS,
341 .max_entries = DOS_ENTRY_NUMBERS,
342 .get_info = part_get_info_ptr(part_get_info_dos),
343 .print = part_print_ptr(part_print_dos),
344 .test = part_test_dos,