1 #if ENABLE_FEATURE_GPT_LABEL
3 * Copyright (C) 2010 Kevin Cernekee <cernekee@gmail.com>
5 * Licensed under GPLv2, see file LICENSE in this source tree.
8 #define GPT_MAGIC 0x5452415020494645ULL
10 LEGACY_GPT_TYPE = 0xee,
12 GPT_MAX_PART_ENTRY_LEN = 4096,
24 uint64_t first_usable_lba;
25 uint64_t last_usable_lba;
26 uint8_t disk_guid[GUID_LEN];
27 uint64_t first_part_lba;
29 uint32_t part_entry_len;
30 uint32_t part_array_crc32;
34 uint8_t type_guid[GUID_LEN];
35 uint8_t part_guid[GUID_LEN];
42 static gpt_header *gpt_hdr;
44 static char *part_array;
45 static unsigned int n_parts;
46 static unsigned int part_array_len;
47 static unsigned int part_entry_len;
49 static inline gpt_partition *
55 return (gpt_partition *)&part_array[i * part_entry_len];
59 gpt_crc32(void *buf, int len)
61 return ~crc32_block_endian0(0xffffffff, buf, len, global_crc32_table);
65 gpt_print_guid(uint8_t *buf)
68 "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
69 buf[3], buf[2], buf[1], buf[0],
73 buf[10], buf[11], buf[12], buf[13], buf[14], buf[15]);
76 /* TODO: real unicode support */
78 gpt_print_wide(uint16_t *s, int max_len)
91 gpt_list_table(int xtra UNUSED_PARAM)
98 smart_ulltoa5(total_number_of_sectors, numstr6, " KMGTPEZY");
99 printf("Disk %s: %llu sectors, %s\n", disk_device,
100 (unsigned long long)total_number_of_sectors,
102 printf("Logical sector size: %u\n", sector_size);
103 printf("Disk identifier (GUID): ");
104 gpt_print_guid(gpt_hdr->disk_guid);
105 printf("\nPartition table holds up to %u entries\n",
106 (int)SWAP_LE32(gpt_hdr->n_parts));
107 printf("First usable sector is %llu, last usable sector is %llu\n\n",
108 (unsigned long long)SWAP_LE64(gpt_hdr->first_usable_lba),
109 (unsigned long long)SWAP_LE64(gpt_hdr->last_usable_lba));
111 printf("Number Start (sector) End (sector) Size Code Name\n");
112 for (i = 0; i < n_parts; i++) {
113 gpt_partition *p = gpt_part(i);
115 smart_ulltoa5(1 + SWAP_LE64(p->lba_end) - SWAP_LE64(p->lba_start),
116 numstr6, " KMGTPEZY");
117 printf("%4u %15llu %15llu %11s %04x ",
119 (unsigned long long)SWAP_LE64(p->lba_start),
120 (unsigned long long)SWAP_LE64(p->lba_end),
123 gpt_print_wide(p->name, 18);
130 check_gpt_label(void)
132 struct partition *first = pt_offset(MBRbuffer, 0);
136 /* LBA 0 contains the legacy MBR */
138 if (!valid_part_table_flag(MBRbuffer)
139 || first->sys_ind != LEGACY_GPT_TYPE
141 current_label_type = 0;
145 /* LBA 1 contains the GPT header */
148 gpt_hdr = (void *)pe.sectorbuffer;
150 if (gpt_hdr->magic != SWAP_LE64(GPT_MAGIC)) {
151 current_label_type = 0;
155 if (!global_crc32_table) {
156 global_crc32_table = crc32_filltable(NULL, 0);
159 crc = SWAP_LE32(gpt_hdr->hdr_crc32);
160 gpt_hdr->hdr_crc32 = 0;
161 if (gpt_crc32(gpt_hdr, SWAP_LE32(gpt_hdr->hdr_size)) != crc) {
162 /* FIXME: read the backup table */
163 puts("\nwarning: GPT header CRC is invalid\n");
166 n_parts = SWAP_LE32(gpt_hdr->n_parts);
167 part_entry_len = SWAP_LE32(gpt_hdr->part_entry_len);
168 if (n_parts > GPT_MAX_PARTS
169 || part_entry_len > GPT_MAX_PART_ENTRY_LEN
170 || SWAP_LE32(gpt_hdr->hdr_size) > sector_size
172 puts("\nwarning: unable to parse GPT disklabel\n");
173 current_label_type = 0;
177 part_array_len = n_parts * part_entry_len;
178 part_array = xmalloc(part_array_len);
179 seek_sector(SWAP_LE64(gpt_hdr->first_part_lba));
180 if (full_read(dev_fd, part_array, part_array_len) != part_array_len) {
181 fdisk_fatal(unable_to_read);
184 if (gpt_crc32(part_array, part_array_len) != gpt_hdr->part_array_crc32) {
185 /* FIXME: read the backup table */
186 puts("\nwarning: GPT array CRC is invalid\n");
189 puts("Found valid GPT with protective MBR; using GPT\n");
191 current_label_type = LABEL_GPT;
195 #endif /* GPT_LABEL */