part_dos.c 7.6 KB

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  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. * 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. #include <common.h>
  16. #include <command.h>
  17. #include <ide.h>
  18. #include <memalign.h>
  19. #include "part_dos.h"
  20. #ifdef HAVE_BLOCK_DEVICE
  21. #define DOS_PART_DEFAULT_SECTOR 512
  22. /* Convert char[4] in little endian format to the host format integer
  23. */
  24. static inline unsigned int le32_to_int(unsigned char *le32)
  25. {
  26. return ((le32[3] << 24) +
  27. (le32[2] << 16) +
  28. (le32[1] << 8) +
  29. le32[0]
  30. );
  31. }
  32. static inline int is_extended(int part_type)
  33. {
  34. return (part_type == 0x5 ||
  35. part_type == 0xf ||
  36. part_type == 0x85);
  37. }
  38. static inline int is_bootable(dos_partition_t *p)
  39. {
  40. return p->boot_ind == 0x80;
  41. }
  42. static void print_one_part(dos_partition_t *p, lbaint_t ext_part_sector,
  43. int part_num, unsigned int disksig)
  44. {
  45. lbaint_t lba_start = ext_part_sector + le32_to_int (p->start4);
  46. lbaint_t lba_size = le32_to_int (p->size4);
  47. printf("%3d\t%-10" LBAFlength "u\t%-10" LBAFlength
  48. "u\t%08x-%02x\t%02x%s%s\n",
  49. part_num, lba_start, lba_size, disksig, part_num, p->sys_ind,
  50. (is_extended(p->sys_ind) ? " Extd" : ""),
  51. (is_bootable(p) ? " Boot" : ""));
  52. }
  53. static int test_block_type(unsigned char *buffer)
  54. {
  55. int slot;
  56. struct dos_partition *p;
  57. if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
  58. (buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {
  59. return (-1);
  60. } /* no DOS Signature at all */
  61. p = (struct dos_partition *)&buffer[DOS_PART_TBL_OFFSET];
  62. for (slot = 0; slot < 3; slot++) {
  63. if (p->boot_ind != 0 && p->boot_ind != 0x80) {
  64. if (!slot &&
  65. (strncmp((char *)&buffer[DOS_PBR_FSTYPE_OFFSET],
  66. "FAT", 3) == 0 ||
  67. strncmp((char *)&buffer[DOS_PBR32_FSTYPE_OFFSET],
  68. "FAT32", 5) == 0)) {
  69. return DOS_PBR; /* is PBR */
  70. } else {
  71. return -1;
  72. }
  73. }
  74. }
  75. return DOS_MBR; /* Is MBR */
  76. }
  77. static int part_test_dos(struct blk_desc *dev_desc)
  78. {
  79. ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
  80. if (blk_dread(dev_desc, 0, 1, (ulong *)buffer) != 1)
  81. return -1;
  82. if (test_block_type(buffer) != DOS_MBR)
  83. return -1;
  84. return 0;
  85. }
  86. /* Print a partition that is relative to its Extended partition table
  87. */
  88. static void print_partition_extended(struct blk_desc *dev_desc,
  89. lbaint_t ext_part_sector,
  90. lbaint_t relative,
  91. int part_num, unsigned int disksig)
  92. {
  93. ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
  94. dos_partition_t *pt;
  95. int i;
  96. if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
  97. printf ("** Can't read partition table on %d:" LBAFU " **\n",
  98. dev_desc->devnum, ext_part_sector);
  99. return;
  100. }
  101. i=test_block_type(buffer);
  102. if (i != DOS_MBR) {
  103. printf ("bad MBR sector signature 0x%02x%02x\n",
  104. buffer[DOS_PART_MAGIC_OFFSET],
  105. buffer[DOS_PART_MAGIC_OFFSET + 1]);
  106. return;
  107. }
  108. if (!ext_part_sector)
  109. disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
  110. /* Print all primary/logical partitions */
  111. pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
  112. for (i = 0; i < 4; i++, pt++) {
  113. /*
  114. * fdisk does not show the extended partitions that
  115. * are not in the MBR
  116. */
  117. if ((pt->sys_ind != 0) &&
  118. (ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {
  119. print_one_part(pt, ext_part_sector, part_num, disksig);
  120. }
  121. /* Reverse engr the fdisk part# assignment rule! */
  122. if ((ext_part_sector == 0) ||
  123. (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
  124. part_num++;
  125. }
  126. }
  127. /* Follows the extended partitions */
  128. pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
  129. for (i = 0; i < 4; i++, pt++) {
  130. if (is_extended (pt->sys_ind)) {
  131. lbaint_t lba_start
  132. = le32_to_int (pt->start4) + relative;
  133. print_partition_extended(dev_desc, lba_start,
  134. ext_part_sector == 0 ? lba_start : relative,
  135. part_num, disksig);
  136. }
  137. }
  138. return;
  139. }
  140. /* Print a partition that is relative to its Extended partition table
  141. */
  142. static int part_get_info_extended(struct blk_desc *dev_desc,
  143. lbaint_t ext_part_sector, lbaint_t relative,
  144. int part_num, int which_part,
  145. disk_partition_t *info, unsigned int disksig)
  146. {
  147. ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
  148. dos_partition_t *pt;
  149. int i;
  150. int dos_type;
  151. if (blk_dread(dev_desc, ext_part_sector, 1, (ulong *)buffer) != 1) {
  152. printf ("** Can't read partition table on %d:" LBAFU " **\n",
  153. dev_desc->devnum, ext_part_sector);
  154. return -1;
  155. }
  156. if (buffer[DOS_PART_MAGIC_OFFSET] != 0x55 ||
  157. buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) {
  158. printf ("bad MBR sector signature 0x%02x%02x\n",
  159. buffer[DOS_PART_MAGIC_OFFSET],
  160. buffer[DOS_PART_MAGIC_OFFSET + 1]);
  161. return -1;
  162. }
  163. #ifdef CONFIG_PARTITION_UUIDS
  164. if (!ext_part_sector)
  165. disksig = le32_to_int(&buffer[DOS_PART_DISKSIG_OFFSET]);
  166. #endif
  167. /* Print all primary/logical partitions */
  168. pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
  169. for (i = 0; i < 4; i++, pt++) {
  170. /*
  171. * fdisk does not show the extended partitions that
  172. * are not in the MBR
  173. */
  174. if (((pt->boot_ind & ~0x80) == 0) &&
  175. (pt->sys_ind != 0) &&
  176. (part_num == which_part) &&
  177. (is_extended(pt->sys_ind) == 0)) {
  178. info->blksz = DOS_PART_DEFAULT_SECTOR;
  179. info->start = (lbaint_t)(ext_part_sector +
  180. le32_to_int(pt->start4));
  181. info->size = (lbaint_t)le32_to_int(pt->size4);
  182. part_set_generic_name(dev_desc, part_num,
  183. (char *)info->name);
  184. /* sprintf(info->type, "%d, pt->sys_ind); */
  185. strcpy((char *)info->type, "U-Boot");
  186. info->bootable = is_bootable(pt);
  187. #ifdef CONFIG_PARTITION_UUIDS
  188. sprintf(info->uuid, "%08x-%02x", disksig, part_num);
  189. #endif
  190. return 0;
  191. }
  192. /* Reverse engr the fdisk part# assignment rule! */
  193. if ((ext_part_sector == 0) ||
  194. (pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {
  195. part_num++;
  196. }
  197. }
  198. /* Follows the extended partitions */
  199. pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);
  200. for (i = 0; i < 4; i++, pt++) {
  201. if (is_extended (pt->sys_ind)) {
  202. lbaint_t lba_start
  203. = le32_to_int (pt->start4) + relative;
  204. return part_get_info_extended(dev_desc, lba_start,
  205. ext_part_sector == 0 ? lba_start : relative,
  206. part_num, which_part, info, disksig);
  207. }
  208. }
  209. /* Check for DOS PBR if no partition is found */
  210. dos_type = test_block_type(buffer);
  211. if (dos_type == DOS_PBR) {
  212. info->start = 0;
  213. info->size = dev_desc->lba;
  214. info->blksz = DOS_PART_DEFAULT_SECTOR;
  215. info->bootable = 0;
  216. strcpy((char *)info->type, "U-Boot");
  217. #ifdef CONFIG_PARTITION_UUIDS
  218. info->uuid[0] = 0;
  219. #endif
  220. return 0;
  221. }
  222. return -1;
  223. }
  224. void part_print_dos(struct blk_desc *dev_desc)
  225. {
  226. printf("Part\tStart Sector\tNum Sectors\tUUID\t\tType\n");
  227. print_partition_extended(dev_desc, 0, 0, 1, 0);
  228. }
  229. int part_get_info_dos(struct blk_desc *dev_desc, int part,
  230. disk_partition_t *info)
  231. {
  232. return part_get_info_extended(dev_desc, 0, 0, 1, part, info, 0);
  233. }
  234. int is_valid_dos_buf(void *buf)
  235. {
  236. return test_block_type(buf) == DOS_MBR ? 0 : -1;
  237. }
  238. int write_mbr_partition(struct blk_desc *dev_desc, void *buf)
  239. {
  240. if (is_valid_dos_buf(buf))
  241. return -1;
  242. /* write MBR */
  243. if (blk_dwrite(dev_desc, 0, 1, buf) != 1) {
  244. printf("%s: failed writing '%s' (1 blks at 0x0)\n",
  245. __func__, "MBR");
  246. return 1;
  247. }
  248. return 0;
  249. }
  250. U_BOOT_PART_TYPE(dos) = {
  251. .name = "DOS",
  252. .part_type = PART_TYPE_DOS,
  253. .max_entries = DOS_ENTRY_NUMBERS,
  254. .get_info = part_get_info_ptr(part_get_info_dos),
  255. .print = part_print_ptr(part_print_dos),
  256. .test = part_test_dos,
  257. };
  258. #endif