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 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 ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, mbr, dev_desc->blksz); 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 } 105 106 return 0; 107 } 108 109 /* Print a partition that is relative to its Extended partition table 110 */ 111 static void print_partition_extended(struct blk_desc *dev_desc, 112 lbaint_t ext_part_sector, 113 lbaint_t relative, 114 int part_num, unsigned int disksig) 115 { 116 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz); 117 dos_partition_t *pt; 118 int i; 119 120 if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) { 121 printf ("** Can't read partition table on %d:" LBAFU " **\n", 122 dev_desc->devnum, ext_part_sector); 123 return; 124 } 125 i=test_block_type(buffer); 126 if (i != DOS_MBR) { 127 printf ("bad MBR sector signature 0x%02x%02x\n", 128 buffer[DOS_PART_MAGIC_OFFSET], 129 buffer[DOS_PART_MAGIC_OFFSET + 1]); 130 return; 131 } 132 133 if (!ext_part_sector) 134 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]); 135 136 /* Print all primary/logical partitions */ 137 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET); 138 for (i = 0; i < 4; i++, pt++) { 139 /* 140 * fdisk does not show the extended partitions that 141 * are not in the MBR 142 */ 143 144 if ((pt->sys_ind != 0) && 145 (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) { 146 print_one_part(pt, ext_part_sector, part_num, disksig); 147 } 148 149 /* Reverse engr the fdisk part# assignment rule! */ 150 if ((ext_part_sector == 0) || 151 (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) { 152 part_num++; 153 } 154 } 155 156 /* Follows the extended partitions */ 157 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET); 158 for (i = 0; i < 4; i++, pt++) { 159 if (is_extended (pt->sys_ind)) { 160 lbaint_t lba_start 161 = le32_to_int (pt->start4) + relative; 162 163 print_partition_extended(dev_desc, lba_start, 164 ext_part_sector == 0 ? lba_start : relative, 165 part_num, disksig); 166 } 167 } 168 169 return; 170 } 171 172 173 /* Print a partition that is relative to its Extended partition table 174 */ 175 static int part_get_info_extended(struct blk_desc *dev_desc, 176 lbaint_t ext_part_sector, lbaint_t relative, 177 int part_num, int which_part, 178 disk_partition_t *info, unsigned int disksig) 179 { 180 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz); 181 dos_partition_t *pt; 182 int i; 183 int dos_type; 184 185 if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) { 186 printf ("** Can't read partition table on %d:" LBAFU " **\n", 187 dev_desc->devnum, ext_part_sector); 188 return -1; 189 } 190 if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 || 191 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) { 192 printf ("bad MBR sector signature 0x%02x%02x\n", 193 buffer[DOS_PART_MAGIC_OFFSET], 194 buffer[DOS_PART_MAGIC_OFFSET + 1]); 195 return -1; 196 } 197 198 #if CONFIG_IS_ENABLED(PARTITION_UUIDS) 199 if (!ext_part_sector) 200 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]); 201 #endif 202 203 /* Print all primary/logical partitions */ 204 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET); 205 for (i = 0; i < 4; i++, pt++) { 206 /* 207 * fdisk does not show the extended partitions that 208 * are not in the MBR 209 */ 210 if (((pt->boot_ind & ~0x80) == 0) && 211 (pt->sys_ind != 0) && 212 (part_num == which_part) && 213 (is_extended(pt->sys_ind) == 0)) { 214 info->blksz = DOS_PART_DEFAULT_SECTOR; 215 info->start = (lbaint_t)(ext_part_sector + 216 le32_to_int(pt->start4)); 217 info->size = (lbaint_t)le32_to_int(pt->size4); 218 part_set_generic_name(dev_desc, part_num, 219 (char *)info->name); 220 /* sprintf(info->type, "%d, pt->sys_ind); */ 221 strcpy((char *)info->type, "U-Boot"); 222 info->bootable = is_bootable(pt); 223 #if CONFIG_IS_ENABLED(PARTITION_UUIDS) 224 sprintf(info->uuid, "%08x-%02x", disksig, part_num); 225 #endif 226 info->sys_ind = pt->sys_ind; 227 return 0; 228 } 229 230 /* Reverse engr the fdisk part# assignment rule! */ 231 if ((ext_part_sector == 0) || 232 (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) { 233 part_num++; 234 } 235 } 236 237 /* Follows the extended partitions */ 238 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET); 239 for (i = 0; i < 4; i++, pt++) { 240 if (is_extended (pt->sys_ind)) { 241 lbaint_t lba_start 242 = le32_to_int (pt->start4) + relative; 243 244 return part_get_info_extended(dev_desc, lba_start, 245 ext_part_sector == 0 ? lba_start : relative, 246 part_num, which_part, info, disksig); 247 } 248 } 249 250 /* Check for DOS PBR if no partition is found */ 251 dos_type = test_block_type(buffer); 252 253 if (dos_type == DOS_PBR) { 254 info->start = 0; 255 info->size = dev_desc->lba; 256 info->blksz = DOS_PART_DEFAULT_SECTOR; 257 info->bootable = 0; 258 strcpy((char *)info->type, "U-Boot"); 259 #if CONFIG_IS_ENABLED(PARTITION_UUIDS) 260 info->uuid[0] = 0; 261 #endif 262 return 0; 263 } 264 265 return -1; 266 } 267 268 void part_print_dos(struct blk_desc *dev_desc) 269 { 270 printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n"); 271 print_partition_extended(dev_desc, 0, 0, 1, 0); 272 } 273 274 int part_get_info_dos(struct blk_desc *dev_desc, int part, 275 disk_partition_t *info) 276 { 277 return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0); 278 } 279 280 int is_valid_dos_buf(void *buf) 281 { 282 return test_block_type(buf) == DOS_MBR ? 0 : -1; 283 } 284 285 int write_mbr_partition(struct blk_desc *dev_desc, void *buf) 286 { 287 if (is_valid_dos_buf(buf)) 288 return -1; 289 290 /* write MBR */ 291 if (blk_dwrite(dev_desc, 0, 1, buf) != 1) { 292 printf("%s: failed writing '%s' (1 blks at 0x0)\n", 293 __func__, "MBR"); 294 return 1; 295 } 296 297 return 0; 298 } 299 300 U_BOOT_PART_TYPE(dos) = { 301 .name = "DOS", 302 .part_type = PART_TYPE_DOS, 303 .max_entries = DOS_ENTRY_NUMBERS, 304 .get_info = part_get_info_ptr(part_get_info_dos), 305 .print = part_print_ptr(part_print_dos), 306 .test = part_test_dos, 307 }; 308 309 #endif 310