1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2001 4 * Raymond Lo, lo@routefree.com 5 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 6 */ 7 8 /* 9 * Support for harddisk partitions. 10 * 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 14 */ 15 16 #include <common.h> 17 #include <command.h> 18 #include <ide.h> 19 #include <memalign.h> 20 #include "part_dos.h" 21 22 #ifdef CONFIG_HAVE_BLOCK_DEVICE 23 24 #define DOS_PART_DEFAULT_SECTOR 512 25 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 29 30 /* Convert char[4] in little endian format to the host format integer 31 */ 32 static inline unsigned int le32_to_int(unsigned char *le32) 33 { 34 return ((le32[3] << 24) + 35 (le32[2] << 16) + 36 (le32[1] << 8) + 37 le32[0] 38 ); 39 } 40 41 static inline int is_extended(int part_type) 42 { 43 return (part_type == 0x5 || 44 part_type == 0xf || 45 part_type == 0x85); 46 } 47 48 static inline int is_bootable(dos_partition_t *p) 49 { 50 return (p->sys_ind == 0xef) || (p->boot_ind == 0x80); 51 } 52 53 static void print_one_part(dos_partition_t *p, lbaint_t ext_part_sector, 54 int part_num, unsigned int disksig) 55 { 56 lbaint_t lba_start = ext_part_sector + le32_to_int (p->start4); 57 lbaint_t lba_size = le32_to_int (p->size4); 58 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" : "")); 64 } 65 66 static int test_block_type(unsigned char *buffer) 67 { 68 int slot; 69 struct dos_partition *p; 70 71 if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) || 72 (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) { 73 return (-1); 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) { 78 if (!slot && 79 (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET], 80 "FAT", 3) == 0 || 81 strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET], 82 "FAT32", 5) == 0)) { 83 return DOS_PBR; /* is PBR */ 84 } else { 85 return -1; 86 } 87 } 88 } 89 return DOS_MBR; /* Is MBR */ 90 } 91 92 93 static int part_test_dos(struct blk_desc *dev_desc) 94 { 95 #ifndef CONFIG_SPL_BUILD 96 ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr, 1); 97 98 if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1) 99 return -1; 100 101 if (test_block_type((unsigned char *)mbr) != DOS_MBR) 102 return -1; 103 104 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; 108 } 109 #else 110 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz); 111 112 if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1) 113 return -1; 114 115 if (test_block_type(buffer) != DOS_MBR) 116 return -1; 117 #endif 118 119 return 0; 120 } 121 122 /* Print a partition that is relative to its Extended partition table 123 */ 124 static void print_partition_extended(struct blk_desc *dev_desc, 125 lbaint_t ext_part_sector, 126 lbaint_t relative, 127 int part_num, unsigned int disksig) 128 { 129 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz); 130 dos_partition_t *pt; 131 int i; 132 133 /* set a maximum recursion level */ 134 if (part_num > MAX_EXT_PARTS) 135 { 136 printf("** Nested DOS partitions detected, stopping **\n"); 137 return; 138 } 139 140 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); 143 return; 144 } 145 i=test_block_type(buffer); 146 if (i != DOS_MBR) { 147 printf ("bad MBR sector signature 0x%02x%02x\n", 148 buffer[DOS_PART_MAGIC_OFFSET], 149 buffer[DOS_PART_MAGIC_OFFSET + 1]); 150 return; 151 } 152 153 if (!ext_part_sector) 154 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]); 155 156 /* Print all primary/logical partitions */ 157 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET); 158 for (i = 0; i < 4; i++, pt++) { 159 /* 160 * fdisk does not show the extended partitions that 161 * are not in the MBR 162 */ 163 164 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); 167 } 168 169 /* Reverse engr the fdisk part# assignment rule! */ 170 if ((ext_part_sector == 0) || 171 (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) { 172 part_num++; 173 } 174 } 175 176 /* 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)) { 180 lbaint_t lba_start 181 = le32_to_int (pt->start4) + relative; 182 183 print_partition_extended(dev_desc, lba_start, 184 ext_part_sector == 0 ? lba_start : relative, 185 part_num, disksig); 186 } 187 } 188 189 return; 190 } 191 192 193 /* Print a partition that is relative to its Extended partition table 194 */ 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) 199 { 200 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz); 201 dos_partition_t *pt; 202 int i; 203 int dos_type; 204 205 /* set a maximum recursion level */ 206 if (part_num > MAX_EXT_PARTS) 207 { 208 printf("** Nested DOS partitions detected, stopping **\n"); 209 return -1; 210 } 211 212 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); 215 return -1; 216 } 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]); 222 return -1; 223 } 224 225 #if CONFIG_IS_ENABLED(PARTITION_UUIDS) 226 if (!ext_part_sector) 227 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]); 228 #endif 229 230 /* Print all primary/logical partitions */ 231 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET); 232 for (i = 0; i < 4; i++, pt++) { 233 /* 234 * fdisk does not show the extended partitions that 235 * are not in the MBR 236 */ 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, 246 (char *)info->name); 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); 252 #endif 253 info->sys_ind = pt->sys_ind; 254 return 0; 255 } 256 257 /* Reverse engr the fdisk part# assignment rule! */ 258 if ((ext_part_sector == 0) || 259 (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) { 260 part_num++; 261 } 262 } 263 264 /* 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)) { 268 lbaint_t lba_start 269 = le32_to_int (pt->start4) + relative; 270 271 return part_get_info_extended(dev_desc, lba_start, 272 ext_part_sector == 0 ? lba_start : relative, 273 part_num, which_part, info, disksig); 274 } 275 } 276 277 /* Check for DOS PBR if no partition is found */ 278 dos_type = test_block_type(buffer); 279 280 if (dos_type == DOS_PBR) { 281 info->start = 0; 282 info->size = dev_desc->lba; 283 info->blksz = DOS_PART_DEFAULT_SECTOR; 284 info->bootable = 0; 285 strcpy((char *)info->type, "U-Boot"); 286 #if CONFIG_IS_ENABLED(PARTITION_UUIDS) 287 info->uuid[0] = 0; 288 #endif 289 return 0; 290 } 291 292 return -1; 293 } 294 295 void part_print_dos(struct blk_desc *dev_desc) 296 { 297 printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n"); 298 print_partition_extended(dev_desc, 0, 0, 1, 0); 299 } 300 301 int part_get_info_dos(struct blk_desc *dev_desc, int part, 302 disk_partition_t *info) 303 { 304 return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0); 305 } 306 307 int is_valid_dos_buf(void *buf) 308 { 309 return test_block_type(buf) == DOS_MBR ? 0 : -1; 310 } 311 312 int write_mbr_partition(struct blk_desc *dev_desc, void *buf) 313 { 314 if (is_valid_dos_buf(buf)) 315 return -1; 316 317 /* write MBR */ 318 if (blk_dwrite(dev_desc, 0, 1, buf) != 1) { 319 printf("%s: failed writing '%s' (1 blks at 0x0)\n", 320 __func__, "MBR"); 321 return 1; 322 } 323 324 return 0; 325 } 326 327 U_BOOT_PART_TYPE(dos) = { 328 .name = "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, 334 }; 335 336 #endif 337