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
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 inline int is_bootable(dos_partition_t *p)
50 return (p->sys_ind == 0xef) || (p->boot_ind == 0x80);
53 static void print_one_part(dos_partition_t *p, lbaint_t ext_part_sector,
54 int part_num, unsigned int disksig)
56 lbaint_t lba_start = ext_part_sector + le32_to_int (p->start4);
57 lbaint_t lba_size = le32_to_int (p->size4);
59 printf("%3d\t%-10" LBAFlength "u\t%-10" LBAFlength
60 "u\t%08x-%02x\t%02x%s%s\n",
61 part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
62 (is_extended(p->sys_ind) ? " Extd" : ""),
63 (is_bootable(p) ? " Boot" : ""));
66 static int test_block_type(unsigned char *buffer)
69 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];
76 for (slot = 0; slot < 3; slot++) {
77 if (p->boot_ind != 0 && p->boot_ind != 0x80) {
79 (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
81 strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
83 return DOS_PBR; /* is PBR */
89 return DOS_MBR; /* Is MBR */
93 static int part_test_dos(struct blk_desc *dev_desc)
95 #ifndef CONFIG_SPL_BUILD
96 ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr, 1);
98 if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1)
101 if (test_block_type((unsigned char *)mbr) != DOS_MBR)
104 if (dev_desc->sig_type == SIG_TYPE_NONE &&
105 mbr->unique_mbr_signature != 0) {
106 dev_desc->sig_type = SIG_TYPE_MBR;
107 dev_desc->mbr_sig = mbr->unique_mbr_signature;
110 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
112 if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1)
115 if (test_block_type(buffer) != DOS_MBR)
122 /* Print a partition that is relative to its Extended partition table
124 static void print_partition_extended(struct blk_desc *dev_desc,
125 lbaint_t ext_part_sector,
127 int part_num, unsigned int disksig)
129 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
133 /* set a maximum recursion level */
134 if (part_num > MAX_EXT_PARTS)
136 printf("** Nested DOS partitions detected, stopping **\n");
140 if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
141 printf ("** Can't read partition table on %d:" LBAFU " **\n",
142 dev_desc->devnum, ext_part_sector);
145 i=test_block_type(buffer);
147 printf ("bad MBR sector signature 0x%02x%02x\n",
148 buffer[DOS_PART_MAGIC_OFFSET],
149 buffer[DOS_PART_MAGIC_OFFSET + 1]);
153 if (!ext_part_sector)
154 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
156 /* Print all primary/logical partitions */
157 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
158 for (i = 0; i < 4; i++, pt++) {
160 * fdisk does not show the extended partitions that
164 if ((pt->sys_ind != 0) &&
165 (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
166 print_one_part(pt, ext_part_sector, part_num, disksig);
169 /* Reverse engr the fdisk part# assignment rule! */
170 if ((ext_part_sector == 0) ||
171 (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
176 /* Follows the extended partitions */
177 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
178 for (i = 0; i < 4; i++, pt++) {
179 if (is_extended (pt->sys_ind)) {
181 = le32_to_int (pt->start4) + relative;
183 print_partition_extended(dev_desc, lba_start,
184 ext_part_sector == 0 ? lba_start : relative,
193 /* Print a partition that is relative to its Extended partition table
195 static int part_get_info_extended(struct blk_desc *dev_desc,
196 lbaint_t ext_part_sector, lbaint_t relative,
197 int part_num, int which_part,
198 disk_partition_t *info, unsigned int disksig)
200 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
205 /* set a maximum recursion level */
206 if (part_num > MAX_EXT_PARTS)
208 printf("** Nested DOS partitions detected, stopping **\n");
212 if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
213 printf ("** Can't read partition table on %d:" LBAFU " **\n",
214 dev_desc->devnum, ext_part_sector);
217 if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
218 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
219 printf ("bad MBR sector signature 0x%02x%02x\n",
220 buffer[DOS_PART_MAGIC_OFFSET],
221 buffer[DOS_PART_MAGIC_OFFSET + 1]);
225 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
226 if (!ext_part_sector)
227 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
230 /* Print all primary/logical partitions */
231 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
232 for (i = 0; i < 4; i++, pt++) {
234 * fdisk does not show the extended partitions that
237 if (((pt->boot_ind & ~0x80) == 0) &&
238 (pt->sys_ind != 0) &&
239 (part_num == which_part) &&
240 (ext_part_sector == 0 || is_extended(pt->sys_ind) == 0)) {
241 info->blksz = DOS_PART_DEFAULT_SECTOR;
242 info->start = (lbaint_t)(ext_part_sector +
243 le32_to_int(pt->start4));
244 info->size = (lbaint_t)le32_to_int(pt->size4);
245 part_set_generic_name(dev_desc, part_num,
247 /* sprintf(info->type, "%d, pt->sys_ind); */
248 strcpy((char *)info->type, "U-Boot");
249 info->bootable = is_bootable(pt);
250 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
251 sprintf(info->uuid, "%08x-%02x", disksig, part_num);
253 info->sys_ind = pt->sys_ind;
257 /* Reverse engr the fdisk part# assignment rule! */
258 if ((ext_part_sector == 0) ||
259 (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
264 /* Follows the extended partitions */
265 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
266 for (i = 0; i < 4; i++, pt++) {
267 if (is_extended (pt->sys_ind)) {
269 = le32_to_int (pt->start4) + relative;
271 return part_get_info_extended(dev_desc, lba_start,
272 ext_part_sector == 0 ? lba_start : relative,
273 part_num, which_part, info, disksig);
277 /* Check for DOS PBR if no partition is found */
278 dos_type = test_block_type(buffer);
280 if (dos_type == DOS_PBR) {
282 info->size = dev_desc->lba;
283 info->blksz = DOS_PART_DEFAULT_SECTOR;
285 strcpy((char *)info->type, "U-Boot");
286 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
295 void part_print_dos(struct blk_desc *dev_desc)
297 printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
298 print_partition_extended(dev_desc, 0, 0, 1, 0);
301 int part_get_info_dos(struct blk_desc *dev_desc, int part,
302 disk_partition_t *info)
304 return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
307 int is_valid_dos_buf(void *buf)
309 return test_block_type(buf) == DOS_MBR ? 0 : -1;
312 int write_mbr_partition(struct blk_desc *dev_desc, void *buf)
314 if (is_valid_dos_buf(buf))
318 if (blk_dwrite(dev_desc, 0, 1, buf) != 1) {
319 printf("%s: failed writing '%s' (1 blks at 0x0)\n",
327 U_BOOT_PART_TYPE(dos) = {
329 .part_type = PART_TYPE_DOS,
330 .max_entries = DOS_ENTRY_NUMBERS,
331 .get_info = part_get_info_ptr(part_get_info_dos),
332 .print = part_print_ptr(part_print_dos),
333 .test = part_test_dos,