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 /* Convert char[4] in little endian format to the host format integer 27 */ 28 static inline unsigned int le32_to_int(unsigned char *le32) 29 { 30 return ((le32[3] << 24) + 31 (le32[2] << 16) + 32 (le32[1] << 8) + 33 le32[0] 34 ); 35 } 36 37 static inline int is_extended(int part_type) 38 { 39 return (part_type == 0x5 || 40 part_type == 0xf || 41 part_type == 0x85); 42 } 43 44 static inline int is_bootable(dos_partition_t *p) 45 { 46 return (p->sys_ind == 0xef) || (p->boot_ind == 0x80); 47 } 48 49 static void print_one_part(dos_partition_t *p, lbaint_t ext_part_sector, 50 int part_num, unsigned int disksig) 51 { 52 lbaint_t lba_start = ext_part_sector + le32_to_int (p->start4); 53 lbaint_t lba_size = le32_to_int (p->size4); 54 55 printf("%3d\t%-10" LBAFlength "u\t%-10" LBAFlength 56 "u\t%08x-%02x\t%02x%s%s\n", 57 part_num, lba_start, lba_size, disksig, part_num, p->sys_ind, 58 (is_extended(p->sys_ind) ? " Extd" : ""), 59 (is_bootable(p) ? " Boot" : "")); 60 } 61 62 static int test_block_type(unsigned char *buffer) 63 { 64 int slot; 65 struct dos_partition *p; 66 67 if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) || 68 (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) { 69 return (-1); 70 } /* no DOS Signature at all */ 71 p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET]; 72 for (slot = 0; slot < 3; slot++) { 73 if (p->boot_ind != 0 && p->boot_ind != 0x80) { 74 if (!slot && 75 (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET], 76 "FAT", 3) == 0 || 77 strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET], 78 "FAT32", 5) == 0)) { 79 return DOS_PBR; /* is PBR */ 80 } else { 81 return -1; 82 } 83 } 84 } 85 return DOS_MBR; /* Is MBR */ 86 } 87 88 89 static int part_test_dos(struct blk_desc *dev_desc) 90 { 91 #ifndef CONFIG_SPL_BUILD 92 ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr, 1); 93 94 if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1) 95 return -1; 96 97 if (test_block_type((unsigned char *)mbr) != DOS_MBR) 98 return -1; 99 100 if (dev_desc->sig_type == SIG_TYPE_NONE && 101 mbr->unique_mbr_signature != 0) { 102 dev_desc->sig_type = SIG_TYPE_MBR; 103 dev_desc->mbr_sig = mbr->unique_mbr_signature; 104 } 105 #else 106 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz); 107 108 if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1) 109 return -1; 110 111 if (test_block_type(buffer) != DOS_MBR) 112 return -1; 113 #endif 114 115 return 0; 116 } 117 118 /* Print a partition that is relative to its Extended partition table 119 */ 120 static void print_partition_extended(struct blk_desc *dev_desc, 121 lbaint_t ext_part_sector, 122 lbaint_t relative, 123 int part_num, unsigned int disksig) 124 { 125 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz); 126 dos_partition_t *pt; 127 int i; 128 129 if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) { 130 printf ("** Can't read partition table on %d:" LBAFU " **\n", 131 dev_desc->devnum, ext_part_sector); 132 return; 133 } 134 i=test_block_type(buffer); 135 if (i != DOS_MBR) { 136 printf ("bad MBR sector signature 0x%02x%02x\n", 137 buffer[DOS_PART_MAGIC_OFFSET], 138 buffer[DOS_PART_MAGIC_OFFSET + 1]); 139 return; 140 } 141 142 if (!ext_part_sector) 143 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]); 144 145 /* Print all primary/logical partitions */ 146 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET); 147 for (i = 0; i < 4; i++, pt++) { 148 /* 149 * fdisk does not show the extended partitions that 150 * are not in the MBR 151 */ 152 153 if ((pt->sys_ind != 0) && 154 (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) { 155 print_one_part(pt, ext_part_sector, part_num, disksig); 156 } 157 158 /* Reverse engr the fdisk part# assignment rule! */ 159 if ((ext_part_sector == 0) || 160 (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) { 161 part_num++; 162 } 163 } 164 165 /* Follows the extended partitions */ 166 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET); 167 for (i = 0; i < 4; i++, pt++) { 168 if (is_extended (pt->sys_ind)) { 169 lbaint_t lba_start 170 = le32_to_int (pt->start4) + relative; 171 172 print_partition_extended(dev_desc, lba_start, 173 ext_part_sector == 0 ? lba_start : relative, 174 part_num, disksig); 175 } 176 } 177 178 return; 179 } 180 181 182 /* Print a partition that is relative to its Extended partition table 183 */ 184 static int part_get_info_extended(struct blk_desc *dev_desc, 185 lbaint_t ext_part_sector, lbaint_t relative, 186 int part_num, int which_part, 187 disk_partition_t *info, unsigned int disksig) 188 { 189 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz); 190 dos_partition_t *pt; 191 int i; 192 int dos_type; 193 194 if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) { 195 printf ("** Can't read partition table on %d:" LBAFU " **\n", 196 dev_desc->devnum, ext_part_sector); 197 return -1; 198 } 199 if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 || 200 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) { 201 printf ("bad MBR sector signature 0x%02x%02x\n", 202 buffer[DOS_PART_MAGIC_OFFSET], 203 buffer[DOS_PART_MAGIC_OFFSET + 1]); 204 return -1; 205 } 206 207 #if CONFIG_IS_ENABLED(PARTITION_UUIDS) 208 if (!ext_part_sector) 209 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]); 210 #endif 211 212 /* Print all primary/logical partitions */ 213 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET); 214 for (i = 0; i < 4; i++, pt++) { 215 /* 216 * fdisk does not show the extended partitions that 217 * are not in the MBR 218 */ 219 if (((pt->boot_ind & ~0x80) == 0) && 220 (pt->sys_ind != 0) && 221 (part_num == which_part) && 222 (ext_part_sector == 0 || is_extended(pt->sys_ind) == 0)) { 223 info->blksz = DOS_PART_DEFAULT_SECTOR; 224 info->start = (lbaint_t)(ext_part_sector + 225 le32_to_int(pt->start4)); 226 info->size = (lbaint_t)le32_to_int(pt->size4); 227 part_set_generic_name(dev_desc, part_num, 228 (char *)info->name); 229 /* sprintf(info->type, "%d, pt->sys_ind); */ 230 strcpy((char *)info->type, "U-Boot"); 231 info->bootable = is_bootable(pt); 232 #if CONFIG_IS_ENABLED(PARTITION_UUIDS) 233 sprintf(info->uuid, "%08x-%02x", disksig, part_num); 234 #endif 235 info->sys_ind = pt->sys_ind; 236 return 0; 237 } 238 239 /* Reverse engr the fdisk part# assignment rule! */ 240 if ((ext_part_sector == 0) || 241 (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) { 242 part_num++; 243 } 244 } 245 246 /* Follows the extended partitions */ 247 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET); 248 for (i = 0; i < 4; i++, pt++) { 249 if (is_extended (pt->sys_ind)) { 250 lbaint_t lba_start 251 = le32_to_int (pt->start4) + relative; 252 253 return part_get_info_extended(dev_desc, lba_start, 254 ext_part_sector == 0 ? lba_start : relative, 255 part_num, which_part, info, disksig); 256 } 257 } 258 259 /* Check for DOS PBR if no partition is found */ 260 dos_type = test_block_type(buffer); 261 262 if (dos_type == DOS_PBR) { 263 info->start = 0; 264 info->size = dev_desc->lba; 265 info->blksz = DOS_PART_DEFAULT_SECTOR; 266 info->bootable = 0; 267 strcpy((char *)info->type, "U-Boot"); 268 #if CONFIG_IS_ENABLED(PARTITION_UUIDS) 269 info->uuid[0] = 0; 270 #endif 271 return 0; 272 } 273 274 return -1; 275 } 276 277 void part_print_dos(struct blk_desc *dev_desc) 278 { 279 printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n"); 280 print_partition_extended(dev_desc, 0, 0, 1, 0); 281 } 282 283 int part_get_info_dos(struct blk_desc *dev_desc, int part, 284 disk_partition_t *info) 285 { 286 return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0); 287 } 288 289 int is_valid_dos_buf(void *buf) 290 { 291 return test_block_type(buf) == DOS_MBR ? 0 : -1; 292 } 293 294 int write_mbr_partition(struct blk_desc *dev_desc, void *buf) 295 { 296 if (is_valid_dos_buf(buf)) 297 return -1; 298 299 /* write MBR */ 300 if (blk_dwrite(dev_desc, 0, 1, buf) != 1) { 301 printf("%s: failed writing '%s' (1 blks at 0x0)\n", 302 __func__, "MBR"); 303 return 1; 304 } 305 306 return 0; 307 } 308 309 U_BOOT_PART_TYPE(dos) = { 310 .name = "DOS", 311 .part_type = PART_TYPE_DOS, 312 .max_entries = DOS_ENTRY_NUMBERS, 313 .get_info = part_get_info_ptr(part_get_info_dos), 314 .print = part_print_ptr(part_print_dos), 315 .test = part_test_dos, 316 }; 317 318 #endif 319