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->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(unsigned char, buffer, dev_desc->blksz); 93 94 if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1) 95 return -1; 96 97 if (test_block_type(buffer) != DOS_MBR) 98 return -1; 99 100 return 0; 101 } 102 103 /* Print a partition that is relative to its Extended partition table 104 */ 105 static void print_partition_extended(struct blk_desc *dev_desc, 106 lbaint_t ext_part_sector, 107 lbaint_t relative, 108 int part_num, unsigned int disksig) 109 { 110 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz); 111 dos_partition_t *pt; 112 int i; 113 114 if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) { 115 printf ("** Can't read partition table on %d:" LBAFU " **\n", 116 dev_desc->devnum, ext_part_sector); 117 return; 118 } 119 i=test_block_type(buffer); 120 if (i != DOS_MBR) { 121 printf ("bad MBR sector signature 0x%02x%02x\n", 122 buffer[DOS_PART_MAGIC_OFFSET], 123 buffer[DOS_PART_MAGIC_OFFSET + 1]); 124 return; 125 } 126 127 if (!ext_part_sector) 128 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]); 129 130 /* Print all primary/logical partitions */ 131 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET); 132 for (i = 0; i < 4; i++, pt++) { 133 /* 134 * fdisk does not show the extended partitions that 135 * are not in the MBR 136 */ 137 138 if ((pt->sys_ind != 0) && 139 (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) { 140 print_one_part(pt, ext_part_sector, part_num, disksig); 141 } 142 143 /* Reverse engr the fdisk part# assignment rule! */ 144 if ((ext_part_sector == 0) || 145 (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) { 146 part_num++; 147 } 148 } 149 150 /* Follows the extended partitions */ 151 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET); 152 for (i = 0; i < 4; i++, pt++) { 153 if (is_extended (pt->sys_ind)) { 154 lbaint_t lba_start 155 = le32_to_int (pt->start4) + relative; 156 157 print_partition_extended(dev_desc, lba_start, 158 ext_part_sector == 0 ? lba_start : relative, 159 part_num, disksig); 160 } 161 } 162 163 return; 164 } 165 166 167 /* Print a partition that is relative to its Extended partition table 168 */ 169 static int part_get_info_extended(struct blk_desc *dev_desc, 170 lbaint_t ext_part_sector, lbaint_t relative, 171 int part_num, int which_part, 172 disk_partition_t *info, unsigned int disksig) 173 { 174 ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz); 175 dos_partition_t *pt; 176 int i; 177 int dos_type; 178 179 if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) { 180 printf ("** Can't read partition table on %d:" LBAFU " **\n", 181 dev_desc->devnum, ext_part_sector); 182 return -1; 183 } 184 if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 || 185 buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) { 186 printf ("bad MBR sector signature 0x%02x%02x\n", 187 buffer[DOS_PART_MAGIC_OFFSET], 188 buffer[DOS_PART_MAGIC_OFFSET + 1]); 189 return -1; 190 } 191 192 #ifdef CONFIG_PARTITION_UUIDS 193 if (!ext_part_sector) 194 disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]); 195 #endif 196 197 /* Print all primary/logical partitions */ 198 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET); 199 for (i = 0; i < 4; i++, pt++) { 200 /* 201 * fdisk does not show the extended partitions that 202 * are not in the MBR 203 */ 204 if (((pt->boot_ind & ~0x80) == 0) && 205 (pt->sys_ind != 0) && 206 (part_num == which_part) && 207 (is_extended(pt->sys_ind) == 0)) { 208 info->blksz = DOS_PART_DEFAULT_SECTOR; 209 info->start = (lbaint_t)(ext_part_sector + 210 le32_to_int(pt->start4)); 211 info->size = (lbaint_t)le32_to_int(pt->size4); 212 part_set_generic_name(dev_desc, part_num, 213 (char *)info->name); 214 /* sprintf(info->type, "%d, pt->sys_ind); */ 215 strcpy((char *)info->type, "U-Boot"); 216 info->bootable = is_bootable(pt); 217 #ifdef CONFIG_PARTITION_UUIDS 218 sprintf(info->uuid, "%08x-%02x", disksig, part_num); 219 #endif 220 return 0; 221 } 222 223 /* Reverse engr the fdisk part# assignment rule! */ 224 if ((ext_part_sector == 0) || 225 (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) { 226 part_num++; 227 } 228 } 229 230 /* Follows the extended partitions */ 231 pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET); 232 for (i = 0; i < 4; i++, pt++) { 233 if (is_extended (pt->sys_ind)) { 234 lbaint_t lba_start 235 = le32_to_int (pt->start4) + relative; 236 237 return part_get_info_extended(dev_desc, lba_start, 238 ext_part_sector == 0 ? lba_start : relative, 239 part_num, which_part, info, disksig); 240 } 241 } 242 243 /* Check for DOS PBR if no partition is found */ 244 dos_type = test_block_type(buffer); 245 246 if (dos_type == DOS_PBR) { 247 info->start = 0; 248 info->size = dev_desc->lba; 249 info->blksz = DOS_PART_DEFAULT_SECTOR; 250 info->bootable = 0; 251 strcpy((char *)info->type, "U-Boot"); 252 #ifdef CONFIG_PARTITION_UUIDS 253 info->uuid[0] = 0; 254 #endif 255 return 0; 256 } 257 258 return -1; 259 } 260 261 void part_print_dos(struct blk_desc *dev_desc) 262 { 263 printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n"); 264 print_partition_extended(dev_desc, 0, 0, 1, 0); 265 } 266 267 int part_get_info_dos(struct blk_desc *dev_desc, int part, 268 disk_partition_t *info) 269 { 270 return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0); 271 } 272 273 int is_valid_dos_buf(void *buf) 274 { 275 return test_block_type(buf) == DOS_MBR ? 0 : -1; 276 } 277 278 int write_mbr_partition(struct blk_desc *dev_desc, void *buf) 279 { 280 if (is_valid_dos_buf(buf)) 281 return -1; 282 283 /* write MBR */ 284 if (blk_dwrite(dev_desc, 0, 1, buf) != 1) { 285 printf("%s: failed writing '%s' (1 blks at 0x0)\n", 286 __func__, "MBR"); 287 return 1; 288 } 289 290 return 0; 291 } 292 293 U_BOOT_PART_TYPE(dos) = { 294 .name = "DOS", 295 .part_type = PART_TYPE_DOS, 296 .max_entries = DOS_ENTRY_NUMBERS, 297 .get_info = part_get_info_ptr(part_get_info_dos), 298 .print = part_print_ptr(part_print_dos), 299 .test = part_test_dos, 300 }; 301 302 #endif 303