1 /* 2 * (C) Copyright 2001 3 * Raymond Lo, lo@routefree.com 4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 /* 10 * Support for harddisk partitions. 11 * 12 * To be compatible with LinuxPPC and Apple we use the standard Apple 13 * SCSI disk partitioning scheme. For more information see: 14 * http://developer.apple.com/techpubs/mac/Devices/Devices-126.html#MARKER-14-92 15 */ 16 17 #include <common.h> 18 #include <command.h> 19 #include <ide.h> 20 #include <memalign.h> 21 #include "part_dos.h" 22 23 #ifdef CONFIG_HAVE_BLOCK_DEVICE 24 25 #define DOS_PART_DEFAULT_SECTOR 512 26 27 /* Convert char[4] in little endian format to the host format integer 28 */ 29 static inline unsigned int le32_to_int(unsigned char *le32) 30 { 31 return ((le32[3] << 24) + 32 (le32[2] << 16) + 33 (le32[1] << 8) + 34 le32[0] 35 ); 36 } 37 38 static inline int is_extended(int part_type) 39 { 40 return (part_type == 0x5 || 41 part_type == 0xf || 42 part_type == 0x85); 43 } 44 45 static inline int is_bootable(dos_partition_t *p) 46 { 47 return (p->sys_ind == 0xef) || (p->boot_ind == 0x80); 48 } 49 50 static void print_one_part(dos_partition_t *p, lbaint_t ext_part_sector, 51 int part_num, unsigned int disksig) 52 { 53 lbaint_t lba_start = ext_part_sector + le32_to_int (p->start4); 54 lbaint_t lba_size = le32_to_int (p->size4); 55 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 (is_bootable(p) ? " Boot" : "")); 61 } 62 63 static int test_block_type(unsigned char *buffer) 64 { 65 int slot; 66 struct dos_partition *p; 67 68 if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) || 69 (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) { 70 return (-1); 71 } /* no DOS Signature at all */ 72 p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET]; 73 for (slot = 0; slot < 3; slot++) { 74 if (p->boot_ind != 0 && p->boot_ind != 0x80) { 75 if (!slot && 76 (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET], 77 "FAT", 3) == 0 || 78 strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET], 79 "FAT32", 5) == 0)) { 80 return DOS_PBR; /* is PBR */ 81 } else { 82 return -1; 83 } 84 } 85 } 86 return DOS_MBR; /* Is MBR */ 87 } 88 89 90 static int part_test_dos(struct blk_desc *dev_desc) 91 { 92 #ifndef CONFIG_SPL_BUILD 93 ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr, 1); 94 95 if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1) 96 return -1; 97 98 if (test_block_type((unsigned char *)mbr) != DOS_MBR) 99 return -1; 100 101 if (dev_desc->sig_type == SIG_TYPE_NONE && 102 mbr->unique_mbr_signature != 0) { 103 dev_desc->sig_type = SIG_TYPE_MBR; 104 dev_desc->mbr_sig = mbr->unique_mbr_signature; 105 } 106 #else 107 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz); 108 109 if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1) 110 return -1; 111 112 if (test_block_type(buffer) != DOS_MBR) 113 return -1; 114 #endif 115 116 return 0; 117 } 118 119 /* Print a partition that is relative to its Extended partition table 120 */ 121 static void print_partition_extended(struct blk_desc *dev_desc, 122 lbaint_t ext_part_sector, 123 lbaint_t relative, 124 int part_num, unsigned int disksig) 125 { 126 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz); 127 dos_partition_t *pt; 128 int i; 129 130 if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) { 131 printf ("** Can't read partition table on %d:" LBAFU " **\n", 132 dev_desc->devnum, ext_part_sector); 133 return; 134 } 135 i=test_block_type(buffer); 136 if (i != DOS_MBR) { 137 printf ("bad MBR sector signature 0x%02x%02x\n", 138 buffer[DOS_PART_MAGIC_OFFSET], 139 buffer[DOS_PART_MAGIC_OFFSET + 1]); 140 return; 141 } 142 143 if (!ext_part_sector) 144 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]); 145 146 /* Print all primary/logical partitions */ 147 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET); 148 for (i = 0; i < 4; i++, pt++) { 149 /* 150 * fdisk does not show the extended partitions that 151 * are not in the MBR 152 */ 153 154 if ((pt->sys_ind != 0) && 155 (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) { 156 print_one_part(pt, ext_part_sector, part_num, disksig); 157 } 158 159 /* Reverse engr the fdisk part# assignment rule! */ 160 if ((ext_part_sector == 0) || 161 (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) { 162 part_num++; 163 } 164 } 165 166 /* Follows the extended partitions */ 167 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET); 168 for (i = 0; i < 4; i++, pt++) { 169 if (is_extended (pt->sys_ind)) { 170 lbaint_t lba_start 171 = le32_to_int (pt->start4) + relative; 172 173 print_partition_extended(dev_desc, lba_start, 174 ext_part_sector == 0 ? lba_start : relative, 175 part_num, disksig); 176 } 177 } 178 179 return; 180 } 181 182 183 /* Print a partition that is relative to its Extended partition table 184 */ 185 static int part_get_info_extended(struct blk_desc *dev_desc, 186 lbaint_t ext_part_sector, lbaint_t relative, 187 int part_num, int which_part, 188 disk_partition_t *info, unsigned int disksig) 189 { 190 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz); 191 dos_partition_t *pt; 192 int i; 193 int dos_type; 194 195 if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) { 196 printf ("** Can't read partition table on %d:" LBAFU " **\n", 197 dev_desc->devnum, ext_part_sector); 198 return -1; 199 } 200 if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 || 201 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) { 202 printf ("bad MBR sector signature 0x%02x%02x\n", 203 buffer[DOS_PART_MAGIC_OFFSET], 204 buffer[DOS_PART_MAGIC_OFFSET + 1]); 205 return -1; 206 } 207 208 #if CONFIG_IS_ENABLED(PARTITION_UUIDS) 209 if (!ext_part_sector) 210 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]); 211 #endif 212 213 /* Print all primary/logical partitions */ 214 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET); 215 for (i = 0; i < 4; i++, pt++) { 216 /* 217 * fdisk does not show the extended partitions that 218 * are not in the MBR 219 */ 220 if (((pt->boot_ind & ~0x80) == 0) && 221 (pt->sys_ind != 0) && 222 (part_num == which_part) && 223 (ext_part_sector == 0 || is_extended(pt->sys_ind) == 0)) { 224 info->blksz = DOS_PART_DEFAULT_SECTOR; 225 info->start = (lbaint_t)(ext_part_sector + 226 le32_to_int(pt->start4)); 227 info->size = (lbaint_t)le32_to_int(pt->size4); 228 part_set_generic_name(dev_desc, part_num, 229 (char *)info->name); 230 /* sprintf(info->type, "%d, pt->sys_ind); */ 231 strcpy((char *)info->type, "U-Boot"); 232 info->bootable = is_bootable(pt); 233 #if CONFIG_IS_ENABLED(PARTITION_UUIDS) 234 sprintf(info->uuid, "%08x-%02x", disksig, part_num); 235 #endif 236 info->sys_ind = pt->sys_ind; 237 return 0; 238 } 239 240 /* Reverse engr the fdisk part# assignment rule! */ 241 if ((ext_part_sector == 0) || 242 (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) { 243 part_num++; 244 } 245 } 246 247 /* Follows the extended partitions */ 248 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET); 249 for (i = 0; i < 4; i++, pt++) { 250 if (is_extended (pt->sys_ind)) { 251 lbaint_t lba_start 252 = le32_to_int (pt->start4) + relative; 253 254 return part_get_info_extended(dev_desc, lba_start, 255 ext_part_sector == 0 ? lba_start : relative, 256 part_num, which_part, info, disksig); 257 } 258 } 259 260 /* Check for DOS PBR if no partition is found */ 261 dos_type = test_block_type(buffer); 262 263 if (dos_type == DOS_PBR) { 264 info->start = 0; 265 info->size = dev_desc->lba; 266 info->blksz = DOS_PART_DEFAULT_SECTOR; 267 info->bootable = 0; 268 strcpy((char *)info->type, "U-Boot"); 269 #if CONFIG_IS_ENABLED(PARTITION_UUIDS) 270 info->uuid[0] = 0; 271 #endif 272 return 0; 273 } 274 275 return -1; 276 } 277 278 void part_print_dos(struct blk_desc *dev_desc) 279 { 280 printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n"); 281 print_partition_extended(dev_desc, 0, 0, 1, 0); 282 } 283 284 int part_get_info_dos(struct blk_desc *dev_desc, int part, 285 disk_partition_t *info) 286 { 287 return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0); 288 } 289 290 int is_valid_dos_buf(void *buf) 291 { 292 return test_block_type(buf) == DOS_MBR ? 0 : -1; 293 } 294 295 int write_mbr_partition(struct blk_desc *dev_desc, void *buf) 296 { 297 if (is_valid_dos_buf(buf)) 298 return -1; 299 300 /* write MBR */ 301 if (blk_dwrite(dev_desc, 0, 1, buf) != 1) { 302 printf("%s: failed writing '%s' (1 blks at 0x0)\n", 303 __func__, "MBR"); 304 return 1; 305 } 306 307 return 0; 308 } 309 310 U_BOOT_PART_TYPE(dos) = { 311 .name = "DOS", 312 .part_type = PART_TYPE_DOS, 313 .max_entries = DOS_ENTRY_NUMBERS, 314 .get_info = part_get_info_ptr(part_get_info_dos), 315 .print = part_print_ptr(part_print_dos), 316 .test = part_test_dos, 317 }; 318 319 #endif 320