Channagoud Kadabi | f73aa29 | 2013-01-31 16:55:20 -0800 | [diff] [blame] | 1 | /* Copyright (c) 2011-2013, The Linux Foundation. All rights reserved. |
Kinson Chik | 66552a8 | 2011-03-29 15:59:06 -0700 | [diff] [blame] | 2 | |
| 3 | * Redistribution and use in source and binary forms, with or without |
| 4 | * modification, are permitted provided that the following conditions are |
| 5 | * met: |
| 6 | * * Redistributions of source code must retain the above copyright |
| 7 | * notice, this list of conditions and the following disclaimer. |
| 8 | * * Redistributions in binary form must reproduce the above |
| 9 | * copyright notice, this list of conditions and the following |
| 10 | * disclaimer in the documentation and/or other materials provided |
| 11 | * with the distribution. |
Channagoud Kadabi | f73aa29 | 2013-01-31 16:55:20 -0800 | [diff] [blame] | 12 | * * Neither the name of The Linux Foundation. nor the names of its |
Kinson Chik | 66552a8 | 2011-03-29 15:59:06 -0700 | [diff] [blame] | 13 | * contributors may be used to endorse or promote products derived |
| 14 | * from this software without specific prior written permission. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED |
| 17 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 18 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT |
| 19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS |
| 20 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| 23 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE |
| 25 | * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN |
| 26 | * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | #include <stdlib.h> |
| 30 | #include <string.h> |
| 31 | #include "mmc.h" |
| 32 | #include "partition_parser.h" |
| 33 | |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 34 | static uint32_t mmc_boot_read_gpt(); |
| 35 | static uint32_t mmc_boot_read_mbr(); |
| 36 | static void mbr_fill_name(struct partition_entry *partition_ent, |
| 37 | uint32_t type); |
| 38 | static uint32_t partition_verify_mbr_signature(uint32_t size, |
| 39 | uint8_t *buffer); |
| 40 | static uint32_t mbr_partition_get_type(uint32_t size, uint8_t *partition, |
| 41 | uint32_t *partition_type); |
| 42 | |
| 43 | static uint32_t partition_get_type(uint32_t size, uint8_t *partition, |
| 44 | uint32_t *partition_type); |
| 45 | static uint32_t partition_parse_gpt_header(uint8_t *buffer, |
| 46 | uint64_t *first_usable_lba, |
| 47 | uint32_t *partition_entry_size, |
| 48 | uint32_t *header_size, |
| 49 | uint32_t *max_partition_count); |
| 50 | |
| 51 | static uint32_t write_mbr(uint32_t, uint8_t *mbrImage); |
| 52 | static uint32_t write_gpt(uint32_t size, uint8_t *gptImage); |
| 53 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 54 | char *ext3_partitions[] = |
| 55 | { "system", "userdata", "persist", "cache", "tombstones" }; |
| 56 | char *vfat_partitions[] = { "modem", "mdm", "NONE" }; |
| 57 | |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 58 | unsigned int ext3_count = 0; |
| 59 | unsigned int vfat_count = 0; |
| 60 | |
| 61 | struct partition_entry partition_entries[NUM_PARTITIONS]; |
| 62 | unsigned gpt_partitions_exist = 0; |
| 63 | unsigned partition_count = 0; |
| 64 | |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 65 | unsigned int partition_read_table() |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 66 | { |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 67 | unsigned int ret; |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 68 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 69 | /* Read MBR of the card */ |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 70 | ret = mmc_boot_read_mbr(); |
| 71 | if (ret) { |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 72 | dprintf(CRITICAL, "MMC Boot: MBR read failed!\n"); |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 73 | return 1; |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 74 | } |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 75 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 76 | /* Read GPT of the card if exist */ |
| 77 | if (gpt_partitions_exist) { |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 78 | ret = mmc_boot_read_gpt(); |
| 79 | if (ret) { |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 80 | dprintf(CRITICAL, "MMC Boot: GPT read failed!\n"); |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 81 | return 1; |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 82 | } |
| 83 | } |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 84 | return 0; |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | /* |
| 88 | * Read MBR from MMC card and fill partition table. |
| 89 | */ |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 90 | static unsigned int mmc_boot_read_mbr() |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 91 | { |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 92 | unsigned char buffer[BLOCK_SIZE]; |
| 93 | unsigned int dtype; |
| 94 | unsigned int dfirstsec; |
| 95 | unsigned int EBR_first_sec; |
| 96 | unsigned int EBR_current_sec; |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 97 | int ret = 0; |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 98 | int idx, i; |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 99 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 100 | /* Print out the MBR first */ |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 101 | ret = mmc_read(0, (unsigned int *)buffer, BLOCK_SIZE); |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 102 | if (ret) { |
| 103 | dprintf(CRITICAL, "Could not read partition from mmc\n"); |
| 104 | return ret; |
| 105 | } |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 106 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 107 | /* Check to see if signature exists */ |
| 108 | ret = partition_verify_mbr_signature(BLOCK_SIZE, buffer); |
| 109 | if (ret) { |
| 110 | return ret; |
| 111 | } |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 112 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 113 | /* |
| 114 | * Process each of the four partitions in the MBR by reading the table |
| 115 | * information into our mbr table. |
| 116 | */ |
| 117 | partition_count = 0; |
| 118 | idx = TABLE_ENTRY_0; |
| 119 | for (i = 0; i < 4; i++) { |
| 120 | /* Type 0xEE indicates end of MBR and GPT partitions exist */ |
| 121 | dtype = buffer[idx + i * TABLE_ENTRY_SIZE + OFFSET_TYPE]; |
| 122 | if (dtype == MBR_PROTECTED_TYPE) { |
| 123 | gpt_partitions_exist = 1; |
| 124 | return ret; |
| 125 | } |
| 126 | partition_entries[partition_count].dtype = dtype; |
| 127 | partition_entries[partition_count].attribute_flag = |
| 128 | buffer[idx + i * TABLE_ENTRY_SIZE + OFFSET_STATUS]; |
| 129 | partition_entries[partition_count].first_lba = |
| 130 | GET_LWORD_FROM_BYTE(&buffer[idx + |
| 131 | i * TABLE_ENTRY_SIZE + |
| 132 | OFFSET_FIRST_SEC]); |
| 133 | partition_entries[partition_count].size = |
| 134 | GET_LWORD_FROM_BYTE(&buffer[idx + |
| 135 | i * TABLE_ENTRY_SIZE + |
| 136 | OFFSET_SIZE]); |
| 137 | dfirstsec = partition_entries[partition_count].first_lba; |
| 138 | mbr_fill_name(&partition_entries[partition_count], |
| 139 | partition_entries[partition_count].dtype); |
| 140 | partition_count++; |
| 141 | if (partition_count == NUM_PARTITIONS) |
| 142 | return ret; |
| 143 | } |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 144 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 145 | /* See if the last partition is EBR, if not, parsing is done */ |
| 146 | if (dtype != MBR_EBR_TYPE) { |
| 147 | return ret; |
| 148 | } |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 149 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 150 | EBR_first_sec = dfirstsec; |
| 151 | EBR_current_sec = dfirstsec; |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 152 | |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 153 | ret = mmc_read((EBR_first_sec * 512), (unsigned int *)buffer, BLOCK_SIZE); |
| 154 | if (ret) |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 155 | return ret; |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 156 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 157 | /* Loop to parse the EBR */ |
| 158 | for (i = 0;; i++) { |
| 159 | ret = partition_verify_mbr_signature(BLOCK_SIZE, buffer); |
| 160 | if (ret) { |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 161 | ret = 0; |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 162 | break; |
| 163 | } |
| 164 | partition_entries[partition_count].attribute_flag = |
| 165 | buffer[TABLE_ENTRY_0 + OFFSET_STATUS]; |
| 166 | partition_entries[partition_count].dtype = |
| 167 | buffer[TABLE_ENTRY_0 + OFFSET_TYPE]; |
| 168 | partition_entries[partition_count].first_lba = |
| 169 | GET_LWORD_FROM_BYTE(&buffer[TABLE_ENTRY_0 + |
| 170 | OFFSET_FIRST_SEC]) + |
| 171 | EBR_current_sec; |
| 172 | partition_entries[partition_count].size = |
| 173 | GET_LWORD_FROM_BYTE(&buffer[TABLE_ENTRY_0 + OFFSET_SIZE]); |
| 174 | mbr_fill_name(&(partition_entries[partition_count]), |
| 175 | partition_entries[partition_count].dtype); |
| 176 | partition_count++; |
| 177 | if (partition_count == NUM_PARTITIONS) |
| 178 | return ret; |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 179 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 180 | dfirstsec = |
| 181 | GET_LWORD_FROM_BYTE(&buffer |
| 182 | [TABLE_ENTRY_1 + OFFSET_FIRST_SEC]); |
| 183 | if (dfirstsec == 0) { |
| 184 | /* Getting to the end of the EBR tables */ |
| 185 | break; |
| 186 | } |
| 187 | /* More EBR to follow - read in the next EBR sector */ |
| 188 | dprintf(SPEW, "Reading EBR block from 0x%X\n", EBR_first_sec |
| 189 | + dfirstsec); |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 190 | ret = mmc_read(((EBR_first_sec + dfirstsec) * 512),(unsigned int *)buffer, |
| 191 | BLOCK_SIZE); |
| 192 | if (ret) |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 193 | return ret; |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 194 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 195 | EBR_current_sec = EBR_first_sec + dfirstsec; |
| 196 | } |
| 197 | return ret; |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 198 | } |
Kinson Chik | 66552a8 | 2011-03-29 15:59:06 -0700 | [diff] [blame] | 199 | |
| 200 | /* |
| 201 | * Read GPT from MMC and fill partition table |
| 202 | */ |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 203 | static unsigned int mmc_boot_read_gpt() |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 204 | { |
Kinson Chik | 66552a8 | 2011-03-29 15:59:06 -0700 | [diff] [blame] | 205 | |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 206 | int ret = 0; |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 207 | unsigned int header_size; |
| 208 | unsigned long long first_usable_lba; |
| 209 | unsigned long long backup_header_lba; |
Neeti Desai | ce6ad9a | 2012-03-21 18:57:59 -0700 | [diff] [blame] | 210 | unsigned long long card_size_sec; |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 211 | unsigned int max_partition_count = 0; |
| 212 | unsigned int partition_entry_size; |
| 213 | unsigned char data[BLOCK_SIZE]; |
| 214 | unsigned int i = 0; /* Counter for each 512 block */ |
| 215 | unsigned int j = 0; /* Counter for each 128 entry in the 512 block */ |
| 216 | unsigned int n = 0; /* Counter for UTF-16 -> 8 conversion */ |
| 217 | unsigned char UTF16_name[MAX_GPT_NAME_SIZE]; |
| 218 | /* LBA of first partition -- 1 Block after Protected MBR + 1 for PT */ |
Neeti Desai | ce6ad9a | 2012-03-21 18:57:59 -0700 | [diff] [blame] | 219 | unsigned long long partition_0; |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 220 | uint64_t device_density; |
| 221 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 222 | partition_count = 0; |
Kinson Chik | 66552a8 | 2011-03-29 15:59:06 -0700 | [diff] [blame] | 223 | |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 224 | /* Get the density of the mmc device */ |
| 225 | |
| 226 | device_density = mmc_get_device_capacity(); |
| 227 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 228 | /* Print out the GPT first */ |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 229 | ret = mmc_read(PROTECTIVE_MBR_SIZE, (unsigned int *)data, BLOCK_SIZE); |
| 230 | if (ret) |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 231 | dprintf(CRITICAL, "GPT: Could not read primary gpt from mmc\n"); |
Kinson Chik | 66552a8 | 2011-03-29 15:59:06 -0700 | [diff] [blame] | 232 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 233 | ret = partition_parse_gpt_header(data, &first_usable_lba, |
| 234 | &partition_entry_size, &header_size, |
| 235 | &max_partition_count); |
| 236 | if (ret) { |
| 237 | dprintf(INFO, "GPT: (WARNING) Primary signature invalid\n"); |
Kinson Chik | 4d7444f | 2011-09-13 15:48:51 -0700 | [diff] [blame] | 238 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 239 | /* Check the backup gpt */ |
Neeti Desai | ce6ad9a | 2012-03-21 18:57:59 -0700 | [diff] [blame] | 240 | |
| 241 | /* Get size of MMC */ |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 242 | card_size_sec = (device_density) / BLOCK_SIZE; |
Neeti Desai | ce6ad9a | 2012-03-21 18:57:59 -0700 | [diff] [blame] | 243 | ASSERT (card_size_sec > 0); |
| 244 | |
| 245 | backup_header_lba = card_size_sec - 1; |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 246 | ret = mmc_read((backup_header_lba * BLOCK_SIZE), (unsigned int *)data, |
| 247 | BLOCK_SIZE); |
Kinson Chik | 4d7444f | 2011-09-13 15:48:51 -0700 | [diff] [blame] | 248 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 249 | if (ret) { |
| 250 | dprintf(CRITICAL, |
| 251 | "GPT: Could not read backup gpt from mmc\n"); |
| 252 | return ret; |
| 253 | } |
Kinson Chik | 4d7444f | 2011-09-13 15:48:51 -0700 | [diff] [blame] | 254 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 255 | ret = partition_parse_gpt_header(data, &first_usable_lba, |
| 256 | &partition_entry_size, |
| 257 | &header_size, |
| 258 | &max_partition_count); |
| 259 | if (ret) { |
| 260 | dprintf(CRITICAL, |
| 261 | "GPT: Primary and backup signatures invalid\n"); |
| 262 | return ret; |
| 263 | } |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 264 | } |
Neeti Desai | ce6ad9a | 2012-03-21 18:57:59 -0700 | [diff] [blame] | 265 | partition_0 = GET_LLWORD_FROM_BYTE(&data[PARTITION_ENTRIES_OFFSET]); |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 266 | /* Read GPT Entries */ |
Channagoud Kadabi | 82a482f | 2013-02-14 21:04:38 -0800 | [diff] [blame] | 267 | for (i = 0; i < (ROUNDUP(max_partition_count, 4)) / 4; i++) { |
neetid | 6c38de1 | 2011-12-02 12:04:50 -0800 | [diff] [blame] | 268 | ASSERT(partition_count < NUM_PARTITIONS); |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 269 | ret = mmc_read((partition_0 * BLOCK_SIZE) + (i * BLOCK_SIZE), |
| 270 | (uint32_t *) data, BLOCK_SIZE); |
Kinson Chik | 66552a8 | 2011-03-29 15:59:06 -0700 | [diff] [blame] | 271 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 272 | if (ret) { |
| 273 | dprintf(CRITICAL, |
| 274 | "GPT: mmc read card failed reading partition entries.\n"); |
| 275 | return ret; |
| 276 | } |
Kinson Chik | 66552a8 | 2011-03-29 15:59:06 -0700 | [diff] [blame] | 277 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 278 | for (j = 0; j < 4; j++) { |
| 279 | memcpy(&(partition_entries[partition_count].type_guid), |
| 280 | &data[(j * partition_entry_size)], |
| 281 | PARTITION_TYPE_GUID_SIZE); |
| 282 | if (partition_entries[partition_count].type_guid[0] == |
| 283 | 0x00 |
| 284 | && partition_entries[partition_count]. |
| 285 | type_guid[1] == 0x00) { |
Channagoud Kadabi | f73aa29 | 2013-01-31 16:55:20 -0800 | [diff] [blame] | 286 | i = ROUNDUP(max_partition_count, 4); |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 287 | break; |
| 288 | } |
| 289 | memcpy(& |
| 290 | (partition_entries[partition_count]. |
| 291 | unique_partition_guid), |
| 292 | &data[(j * partition_entry_size) + |
| 293 | UNIQUE_GUID_OFFSET], |
| 294 | UNIQUE_PARTITION_GUID_SIZE); |
| 295 | partition_entries[partition_count].first_lba = |
| 296 | GET_LLWORD_FROM_BYTE(&data |
| 297 | [(j * partition_entry_size) + |
| 298 | FIRST_LBA_OFFSET]); |
| 299 | partition_entries[partition_count].last_lba = |
| 300 | GET_LLWORD_FROM_BYTE(&data |
| 301 | [(j * partition_entry_size) + |
| 302 | LAST_LBA_OFFSET]); |
| 303 | partition_entries[partition_count].size = |
| 304 | partition_entries[partition_count].last_lba - |
Neeti Desai | 4b8c1df | 2012-03-21 13:15:14 -0700 | [diff] [blame] | 305 | partition_entries[partition_count].first_lba + 1; |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 306 | partition_entries[partition_count].attribute_flag = |
| 307 | GET_LLWORD_FROM_BYTE(&data |
| 308 | [(j * partition_entry_size) + |
| 309 | ATTRIBUTE_FLAG_OFFSET]); |
Kinson Chik | 66552a8 | 2011-03-29 15:59:06 -0700 | [diff] [blame] | 310 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 311 | memset(&UTF16_name, 0x00, MAX_GPT_NAME_SIZE); |
| 312 | memcpy(UTF16_name, &data[(j * partition_entry_size) + |
| 313 | PARTITION_NAME_OFFSET], |
| 314 | MAX_GPT_NAME_SIZE); |
| 315 | /* |
| 316 | * Currently partition names in *.xml are UTF-8 and lowercase |
| 317 | * Only supporting english for now so removing 2nd byte of UTF-16 |
| 318 | */ |
| 319 | for (n = 0; n < MAX_GPT_NAME_SIZE / 2; n++) { |
| 320 | partition_entries[partition_count].name[n] = |
| 321 | UTF16_name[n * 2]; |
| 322 | } |
| 323 | partition_count++; |
| 324 | } |
| 325 | } |
| 326 | return ret; |
Kinson Chik | 66552a8 | 2011-03-29 15:59:06 -0700 | [diff] [blame] | 327 | } |
| 328 | |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 329 | static unsigned int write_mbr_in_blocks(unsigned size, unsigned char *mbrImage) |
| 330 | { |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 331 | unsigned int dtype; |
| 332 | unsigned int dfirstsec; |
| 333 | unsigned int ebrSectorOffset; |
| 334 | unsigned char *ebrImage; |
| 335 | unsigned char *lastAddress; |
| 336 | int idx, i; |
| 337 | unsigned int ret; |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 338 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 339 | /* Write the first block */ |
| 340 | ret = mmc_write(0, BLOCK_SIZE, (unsigned int *)mbrImage); |
| 341 | if (ret) { |
| 342 | dprintf(CRITICAL, "Failed to write mbr partition\n"); |
| 343 | goto end; |
| 344 | } |
| 345 | dprintf(SPEW, "write of first MBR block ok\n"); |
| 346 | /* |
| 347 | Loop through the MBR table to see if there is an EBR. |
| 348 | If found, then figure out where to write the first EBR |
| 349 | */ |
| 350 | idx = TABLE_ENTRY_0; |
| 351 | for (i = 0; i < 4; i++) { |
| 352 | dtype = mbrImage[idx + i * TABLE_ENTRY_SIZE + OFFSET_TYPE]; |
| 353 | if (MBR_EBR_TYPE == dtype) { |
| 354 | dprintf(SPEW, "EBR found.\n"); |
| 355 | break; |
| 356 | } |
| 357 | } |
| 358 | if (MBR_EBR_TYPE != dtype) { |
| 359 | dprintf(SPEW, "No EBR in this image\n"); |
| 360 | goto end; |
| 361 | } |
| 362 | /* EBR exists. Write each EBR block to mmc */ |
| 363 | ebrImage = mbrImage + BLOCK_SIZE; |
| 364 | ebrSectorOffset = |
| 365 | GET_LWORD_FROM_BYTE(&mbrImage |
| 366 | [idx + i * TABLE_ENTRY_SIZE + |
| 367 | OFFSET_FIRST_SEC]); |
| 368 | dfirstsec = 0; |
| 369 | dprintf(SPEW, "first EBR to be written at sector 0x%X\n", dfirstsec); |
| 370 | lastAddress = mbrImage + size; |
| 371 | while (ebrImage < lastAddress) { |
| 372 | dprintf(SPEW, "writing to 0x%X\n", |
| 373 | (ebrSectorOffset + dfirstsec) * BLOCK_SIZE); |
| 374 | ret = |
| 375 | mmc_write((ebrSectorOffset + dfirstsec) * BLOCK_SIZE, |
| 376 | BLOCK_SIZE, (unsigned int *)ebrImage); |
| 377 | if (ret) { |
| 378 | dprintf(CRITICAL, |
| 379 | "Failed to write EBR block to sector 0x%X\n", |
| 380 | dfirstsec); |
| 381 | goto end; |
| 382 | } |
| 383 | dfirstsec = |
| 384 | GET_LWORD_FROM_BYTE(&ebrImage |
| 385 | [TABLE_ENTRY_1 + OFFSET_FIRST_SEC]); |
| 386 | ebrImage += BLOCK_SIZE; |
| 387 | } |
| 388 | dprintf(INFO, "MBR written to mmc successfully\n"); |
| 389 | end: |
| 390 | return ret; |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 391 | } |
| 392 | |
| 393 | /* Write the MBR/EBR to the MMC. */ |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 394 | static unsigned int write_mbr(unsigned size, unsigned char *mbrImage) |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 395 | { |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 396 | unsigned int ret; |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 397 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 398 | /* Verify that passed in block is a valid MBR */ |
| 399 | ret = partition_verify_mbr_signature(size, mbrImage); |
| 400 | if (ret) { |
| 401 | goto end; |
| 402 | } |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 403 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 404 | /* Write the MBR/EBR to mmc */ |
| 405 | ret = write_mbr_in_blocks(size, mbrImage); |
| 406 | if (ret) { |
| 407 | dprintf(CRITICAL, "Failed to write MBR block to mmc.\n"); |
| 408 | goto end; |
| 409 | } |
| 410 | /* Re-read the MBR partition into mbr table */ |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 411 | ret = mmc_boot_read_mbr(); |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 412 | if (ret) { |
| 413 | dprintf(CRITICAL, "Failed to re-read mbr partition.\n"); |
| 414 | goto end; |
| 415 | } |
| 416 | partition_dump(); |
| 417 | end: |
| 418 | return ret; |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 419 | } |
| 420 | |
| 421 | /* |
| 422 | * A8h reflected is 15h, i.e. 10101000 <--> 00010101 |
| 423 | */ |
| 424 | int reflect(int data, int len) |
| 425 | { |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 426 | int ref = 0; |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 427 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 428 | for (int i = 0; i < len; i++) { |
| 429 | if (data & 0x1) { |
| 430 | ref |= (1 << ((len - 1) - i)); |
| 431 | } |
| 432 | data = (data >> 1); |
| 433 | } |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 434 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 435 | return ref; |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 436 | } |
| 437 | |
| 438 | /* |
| 439 | * Function to calculate the CRC32 |
| 440 | */ |
| 441 | unsigned int calculate_crc32(unsigned char *buffer, int len) |
| 442 | { |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 443 | int byte_length = 8; /*length of unit (i.e. byte) */ |
| 444 | int msb = 0; |
| 445 | int polynomial = 0x104C11DB7; /* IEEE 32bit polynomial */ |
| 446 | unsigned int regs = 0xFFFFFFFF; /* init to all ones */ |
| 447 | int regs_mask = 0xFFFFFFFF; /* ensure only 32 bit answer */ |
| 448 | int regs_msb = 0; |
| 449 | unsigned int reflected_regs; |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 450 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 451 | for (int i = 0; i < len; i++) { |
| 452 | int data_byte = buffer[i]; |
| 453 | data_byte = reflect(data_byte, 8); |
| 454 | for (int j = 0; j < byte_length; j++) { |
| 455 | msb = data_byte >> (byte_length - 1); /* get MSB */ |
| 456 | msb &= 1; /* ensure just 1 bit */ |
| 457 | regs_msb = (regs >> 31) & 1; /* MSB of regs */ |
| 458 | regs = regs << 1; /* shift regs for CRC-CCITT */ |
| 459 | if (regs_msb ^ msb) { /* MSB is a 1 */ |
| 460 | regs = regs ^ polynomial; /* XOR with generator poly */ |
| 461 | } |
| 462 | regs = regs & regs_mask; /* Mask off excess upper bits */ |
| 463 | data_byte <<= 1; /* get to next bit */ |
| 464 | } |
| 465 | } |
| 466 | regs = regs & regs_mask; |
| 467 | reflected_regs = reflect(regs, 32) ^ 0xFFFFFFFF; |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 468 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 469 | return reflected_regs; |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 470 | } |
| 471 | |
| 472 | /* |
| 473 | * Write the GPT Partition Entry Array to the MMC. |
| 474 | */ |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 475 | static unsigned int |
| 476 | write_gpt_partition_array(unsigned char *header, |
| 477 | unsigned int partition_array_start, |
| 478 | unsigned int array_size) |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 479 | { |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 480 | unsigned int ret = 1; |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 481 | unsigned long long partition_entry_lba; |
| 482 | unsigned long long partition_entry_array_start_location; |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 483 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 484 | partition_entry_lba = |
| 485 | GET_LLWORD_FROM_BYTE(&header[PARTITION_ENTRIES_OFFSET]); |
| 486 | partition_entry_array_start_location = partition_entry_lba * BLOCK_SIZE; |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 487 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 488 | ret = mmc_write(partition_entry_array_start_location, array_size, |
| 489 | (unsigned int *)partition_array_start); |
| 490 | if (ret) { |
| 491 | dprintf(CRITICAL, |
| 492 | "GPT: FAILED to write the partition entry array\n"); |
| 493 | goto end; |
| 494 | } |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 495 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 496 | end: |
| 497 | return ret; |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 498 | } |
| 499 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 500 | static void |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 501 | patch_gpt(unsigned char *gptImage, uint64_t density, unsigned int array_size, |
| 502 | unsigned int max_part_count, unsigned int part_entry_size) |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 503 | { |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 504 | unsigned int partition_entry_array_start; |
| 505 | unsigned char *primary_gpt_header; |
| 506 | unsigned char *secondary_gpt_header; |
| 507 | unsigned int offset; |
| 508 | unsigned long long card_size_sec; |
| 509 | int total_part = 0; |
| 510 | unsigned int last_part_offset; |
| 511 | unsigned int crc_value; |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 512 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 513 | /* Get size of MMC */ |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 514 | card_size_sec = (density) / 512; |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 515 | /* Working around cap at 4GB */ |
| 516 | if (card_size_sec == 0) { |
| 517 | card_size_sec = 4 * 1024 * 1024 * 2 - 1; |
| 518 | } |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 519 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 520 | /* Patching primary header */ |
| 521 | primary_gpt_header = (gptImage + PROTECTIVE_MBR_SIZE); |
| 522 | PUT_LONG_LONG(primary_gpt_header + BACKUP_HEADER_OFFSET, |
| 523 | ((long long)(card_size_sec - 1))); |
| 524 | PUT_LONG_LONG(primary_gpt_header + LAST_USABLE_LBA_OFFSET, |
| 525 | ((long long)(card_size_sec - 34))); |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 526 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 527 | /* Patching backup GPT */ |
| 528 | offset = (2 * array_size); |
| 529 | secondary_gpt_header = offset + BLOCK_SIZE + primary_gpt_header; |
| 530 | PUT_LONG_LONG(secondary_gpt_header + PRIMARY_HEADER_OFFSET, |
| 531 | ((long long)(card_size_sec - 1))); |
| 532 | PUT_LONG_LONG(secondary_gpt_header + LAST_USABLE_LBA_OFFSET, |
| 533 | ((long long)(card_size_sec - 34))); |
| 534 | PUT_LONG_LONG(secondary_gpt_header + PARTITION_ENTRIES_OFFSET, |
| 535 | ((long long)(card_size_sec - 33))); |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 536 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 537 | /* Find last partition */ |
| 538 | while (*(primary_gpt_header + BLOCK_SIZE + total_part * ENTRY_SIZE) != |
| 539 | 0) { |
| 540 | total_part++; |
| 541 | } |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 542 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 543 | /* Patching last partition */ |
| 544 | last_part_offset = |
| 545 | (total_part - 1) * ENTRY_SIZE + PARTITION_ENTRY_LAST_LBA; |
| 546 | PUT_LONG_LONG(primary_gpt_header + BLOCK_SIZE + last_part_offset, |
| 547 | (long long)(card_size_sec - 34)); |
| 548 | PUT_LONG_LONG(primary_gpt_header + BLOCK_SIZE + last_part_offset + |
| 549 | array_size, (long long)(card_size_sec - 34)); |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 550 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 551 | /* Updating CRC of the Partition entry array in both headers */ |
| 552 | partition_entry_array_start = primary_gpt_header + BLOCK_SIZE; |
| 553 | crc_value = calculate_crc32(partition_entry_array_start, |
| 554 | max_part_count * part_entry_size); |
| 555 | PUT_LONG(primary_gpt_header + PARTITION_CRC_OFFSET, crc_value); |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 556 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 557 | crc_value = calculate_crc32(partition_entry_array_start + array_size, |
| 558 | max_part_count * part_entry_size); |
| 559 | PUT_LONG(secondary_gpt_header + PARTITION_CRC_OFFSET, crc_value); |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 560 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 561 | /* Clearing CRC fields to calculate */ |
| 562 | PUT_LONG(primary_gpt_header + HEADER_CRC_OFFSET, 0); |
| 563 | crc_value = calculate_crc32(primary_gpt_header, 92); |
| 564 | PUT_LONG(primary_gpt_header + HEADER_CRC_OFFSET, crc_value); |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 565 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 566 | PUT_LONG(secondary_gpt_header + HEADER_CRC_OFFSET, 0); |
| 567 | crc_value = (calculate_crc32(secondary_gpt_header, 92)); |
| 568 | PUT_LONG(secondary_gpt_header + HEADER_CRC_OFFSET, crc_value); |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 569 | |
| 570 | } |
| 571 | |
| 572 | /* |
| 573 | * Write the GPT to the MMC. |
| 574 | */ |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 575 | static unsigned int write_gpt(unsigned size, unsigned char *gptImage) |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 576 | { |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 577 | unsigned int ret = 1; |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 578 | unsigned int header_size; |
| 579 | unsigned long long first_usable_lba; |
| 580 | unsigned long long backup_header_lba; |
| 581 | unsigned int max_partition_count = 0; |
| 582 | unsigned int partition_entry_size; |
| 583 | unsigned int partition_entry_array_start; |
| 584 | unsigned char *primary_gpt_header; |
| 585 | unsigned char *secondary_gpt_header; |
| 586 | unsigned int offset; |
| 587 | unsigned int partition_entry_array_size; |
| 588 | unsigned long long primary_header_location; /* address on the emmc card */ |
| 589 | unsigned long long secondary_header_location; /* address on the emmc card */ |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 590 | uint64_t device_density; |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 591 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 592 | /* Verify that passed block has a valid GPT primary header */ |
| 593 | primary_gpt_header = (gptImage + PROTECTIVE_MBR_SIZE); |
| 594 | ret = partition_parse_gpt_header(primary_gpt_header, &first_usable_lba, |
| 595 | &partition_entry_size, &header_size, |
| 596 | &max_partition_count); |
| 597 | if (ret) { |
| 598 | dprintf(CRITICAL, |
| 599 | "GPT: Primary signature invalid cannot write GPT\n"); |
| 600 | goto end; |
| 601 | } |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 602 | |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 603 | /* Get the density of the mmc device */ |
| 604 | |
| 605 | device_density = mmc_get_device_capacity(); |
| 606 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 607 | /* Verify that passed block has a valid backup GPT HEADER */ |
| 608 | partition_entry_array_size = partition_entry_size * max_partition_count; |
| 609 | if (partition_entry_array_size < MIN_PARTITION_ARRAY_SIZE) { |
| 610 | partition_entry_array_size = MIN_PARTITION_ARRAY_SIZE; |
| 611 | } |
| 612 | offset = (2 * partition_entry_array_size); |
| 613 | secondary_gpt_header = offset + BLOCK_SIZE + primary_gpt_header; |
| 614 | ret = |
| 615 | partition_parse_gpt_header(secondary_gpt_header, &first_usable_lba, |
| 616 | &partition_entry_size, &header_size, |
| 617 | &max_partition_count); |
| 618 | if (ret) { |
| 619 | dprintf(CRITICAL, |
| 620 | "GPT: Backup signature invalid cannot write GPT\n"); |
| 621 | goto end; |
| 622 | } |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 623 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 624 | /* Patching the primary and the backup header of the GPT table */ |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 625 | patch_gpt(gptImage, device_density, partition_entry_array_size, |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 626 | max_partition_count, partition_entry_size); |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 627 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 628 | /* Erasing the eMMC card before writing */ |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 629 | ret = mmc_erase_card(0x00000000, device_density); |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 630 | if (ret) { |
| 631 | dprintf(CRITICAL, "Failed to erase the eMMC card\n"); |
| 632 | goto end; |
| 633 | } |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 634 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 635 | /* Writing protective MBR */ |
| 636 | ret = mmc_write(0, PROTECTIVE_MBR_SIZE, (unsigned int *)gptImage); |
| 637 | if (ret) { |
| 638 | dprintf(CRITICAL, "Failed to write Protective MBR\n"); |
| 639 | goto end; |
| 640 | } |
| 641 | /* Writing the primary GPT header */ |
| 642 | primary_header_location = PROTECTIVE_MBR_SIZE; |
| 643 | ret = mmc_write(primary_header_location, BLOCK_SIZE, |
| 644 | (unsigned int *)primary_gpt_header); |
| 645 | if (ret) { |
| 646 | dprintf(CRITICAL, "Failed to write GPT header\n"); |
| 647 | goto end; |
| 648 | } |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 649 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 650 | /* Writing the backup GPT header */ |
| 651 | backup_header_lba = GET_LLWORD_FROM_BYTE |
| 652 | (&primary_gpt_header[BACKUP_HEADER_OFFSET]); |
| 653 | secondary_header_location = backup_header_lba * BLOCK_SIZE; |
| 654 | ret = mmc_write(secondary_header_location, BLOCK_SIZE, |
| 655 | (unsigned int *)secondary_gpt_header); |
| 656 | if (ret) { |
| 657 | dprintf(CRITICAL, "Failed to write GPT backup header\n"); |
| 658 | goto end; |
| 659 | } |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 660 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 661 | /* Writing the partition entries array for the primary header */ |
| 662 | partition_entry_array_start = primary_gpt_header + BLOCK_SIZE; |
| 663 | ret = write_gpt_partition_array(primary_gpt_header, |
| 664 | partition_entry_array_start, |
| 665 | partition_entry_array_size); |
| 666 | if (ret) { |
| 667 | dprintf(CRITICAL, |
| 668 | "GPT: Could not write GPT Partition entries array\n"); |
| 669 | goto end; |
| 670 | } |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 671 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 672 | /*Writing the partition entries array for the backup header */ |
| 673 | partition_entry_array_start = primary_gpt_header + BLOCK_SIZE + |
| 674 | partition_entry_array_size; |
| 675 | ret = write_gpt_partition_array(secondary_gpt_header, |
| 676 | partition_entry_array_start, |
| 677 | partition_entry_array_size); |
| 678 | if (ret) { |
| 679 | dprintf(CRITICAL, |
| 680 | "GPT: Could not write GPT Partition entries array\n"); |
| 681 | goto end; |
| 682 | } |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 683 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 684 | /* Re-read the GPT partition table */ |
| 685 | dprintf(INFO, "Re-reading the GPT Partition Table\n"); |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 686 | ret = mmc_boot_read_gpt(); |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 687 | if (ret) { |
| 688 | dprintf(CRITICAL, |
| 689 | "GPT: Failure to re- read the GPT Partition table\n"); |
| 690 | goto end; |
| 691 | } |
| 692 | partition_dump(); |
| 693 | dprintf(CRITICAL, "GPT: Partition Table written\n"); |
| 694 | memset(primary_gpt_header, 0x00, size); |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 695 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 696 | end: |
| 697 | return ret; |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 698 | } |
| 699 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 700 | unsigned int write_partition(unsigned size, unsigned char *partition) |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 701 | { |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 702 | unsigned int ret = 1; |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 703 | unsigned int partition_type; |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 704 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 705 | if (partition == 0) { |
| 706 | dprintf(CRITICAL, "NULL partition\n"); |
| 707 | goto end; |
| 708 | } |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 709 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 710 | ret = partition_get_type(size, partition, &partition_type); |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 711 | if (ret) |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 712 | goto end; |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 713 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 714 | switch (partition_type) { |
| 715 | case PARTITION_TYPE_MBR: |
| 716 | dprintf(INFO, "Writing MBR partition\n"); |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 717 | ret = write_mbr(size, partition); |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 718 | break; |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 719 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 720 | case PARTITION_TYPE_GPT: |
| 721 | dprintf(INFO, "Writing GPT partition\n"); |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 722 | ret = write_gpt(size, partition); |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 723 | dprintf(CRITICAL, "Re-Flash all the partitions\n"); |
| 724 | break; |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 725 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 726 | default: |
| 727 | dprintf(CRITICAL, "Invalid partition\n"); |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 728 | ret = 1; |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 729 | goto end; |
| 730 | } |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 731 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 732 | end: |
| 733 | return ret; |
Neeti Desai | 5f26aff | 2011-09-30 10:27:40 -0700 | [diff] [blame] | 734 | } |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 735 | |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 736 | /* |
| 737 | * Fill name for android partition found. |
| 738 | */ |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 739 | static void |
| 740 | mbr_fill_name(struct partition_entry *partition_ent, unsigned int type) |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 741 | { |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 742 | switch (type) { |
| 743 | memset(partition_ent->name, 0, MAX_GPT_NAME_SIZE); |
| 744 | case MBR_MODEM_TYPE: |
| 745 | case MBR_MODEM_TYPE2: |
| 746 | /* if already assigned last name available then return */ |
| 747 | if (!strcmp((const char *)vfat_partitions[vfat_count], "NONE")) |
| 748 | return; |
| 749 | strlcpy((char *)partition_ent->name, |
| 750 | (const char *)vfat_partitions[vfat_count], |
| 751 | sizeof(partition_ent->name)); |
| 752 | vfat_count++; |
| 753 | break; |
| 754 | case MBR_SBL1_TYPE: |
| 755 | memcpy(partition_ent->name, "sbl1", 4); |
| 756 | break; |
| 757 | case MBR_SBL2_TYPE: |
| 758 | memcpy(partition_ent->name, "sbl2", 4); |
| 759 | break; |
| 760 | case MBR_SBL3_TYPE: |
| 761 | memcpy(partition_ent->name, "sbl3", 4); |
| 762 | break; |
| 763 | case MBR_RPM_TYPE: |
| 764 | memcpy(partition_ent->name, "rpm", 3); |
| 765 | break; |
| 766 | case MBR_TZ_TYPE: |
| 767 | memcpy(partition_ent->name, "tz", 2); |
| 768 | break; |
| 769 | case MBR_ABOOT_TYPE: |
Channagoud Kadabi | 16f5095 | 2012-04-02 16:24:07 +0530 | [diff] [blame] | 770 | #if PLATFORM_MSM7X27A |
| 771 | memcpy(partition_ent->name, "FOTA", 4); |
| 772 | #else |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 773 | memcpy(partition_ent->name, "aboot", 5); |
Channagoud Kadabi | 16f5095 | 2012-04-02 16:24:07 +0530 | [diff] [blame] | 774 | #endif |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 775 | break; |
| 776 | case MBR_BOOT_TYPE: |
| 777 | memcpy(partition_ent->name, "boot", 4); |
| 778 | break; |
| 779 | case MBR_MODEM_ST1_TYPE: |
| 780 | memcpy(partition_ent->name, "modem_st1", 9); |
| 781 | break; |
| 782 | case MBR_MODEM_ST2_TYPE: |
| 783 | memcpy(partition_ent->name, "modem_st2", 9); |
| 784 | break; |
| 785 | case MBR_EFS2_TYPE: |
| 786 | memcpy(partition_ent->name, "efs2", 4); |
| 787 | break; |
| 788 | case MBR_USERDATA_TYPE: |
| 789 | if (ext3_count == sizeof(ext3_partitions) / sizeof(char *)) |
| 790 | return; |
| 791 | strlcpy((char *)partition_ent->name, |
| 792 | (const char *)ext3_partitions[ext3_count], |
| 793 | sizeof(partition_ent->name)); |
| 794 | ext3_count++; |
| 795 | break; |
| 796 | case MBR_RECOVERY_TYPE: |
| 797 | memcpy(partition_ent->name, "recovery", 8); |
| 798 | break; |
| 799 | case MBR_MISC_TYPE: |
| 800 | memcpy(partition_ent->name, "misc", 4); |
| 801 | break; |
Neeti Desai | 2d6b0e4 | 2012-03-23 15:48:57 -0700 | [diff] [blame] | 802 | case MBR_SSD_TYPE: |
| 803 | memcpy(partition_ent->name, "ssd", 3); |
| 804 | break; |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 805 | }; |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 806 | } |
| 807 | |
| 808 | /* |
| 809 | * Find index of parition in array of partition entries |
| 810 | */ |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 811 | unsigned partition_get_index(const char *name) |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 812 | { |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 813 | unsigned int input_string_length = strlen(name); |
| 814 | unsigned n; |
Kinson Chik | 66552a8 | 2011-03-29 15:59:06 -0700 | [diff] [blame] | 815 | |
neetid | 6c38de1 | 2011-12-02 12:04:50 -0800 | [diff] [blame] | 816 | if( partition_count >= NUM_PARTITIONS) |
| 817 | { |
| 818 | return INVALID_PTN; |
| 819 | } |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 820 | for (n = 0; n < partition_count; n++) { |
| 821 | if (!memcmp |
| 822 | (name, &partition_entries[n].name, input_string_length) |
| 823 | && input_string_length == |
| 824 | strlen((const char *)&partition_entries[n].name)) { |
| 825 | return n; |
| 826 | } |
| 827 | } |
| 828 | return INVALID_PTN; |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 829 | } |
| 830 | |
| 831 | /* Get size of the partition */ |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 832 | unsigned long long partition_get_size(int index) |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 833 | { |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 834 | if (index == INVALID_PTN) |
| 835 | return 0; |
| 836 | else { |
| 837 | return partition_entries[index].size * BLOCK_SIZE; |
| 838 | } |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 839 | } |
| 840 | |
| 841 | /* Get offset of the partition */ |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 842 | unsigned long long partition_get_offset(int index) |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 843 | { |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 844 | if (index == INVALID_PTN) |
| 845 | return 0; |
| 846 | else { |
| 847 | return partition_entries[index].first_lba * BLOCK_SIZE; |
| 848 | } |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 849 | } |
| 850 | |
| 851 | /* Debug: Print all parsed partitions */ |
| 852 | void partition_dump() |
| 853 | { |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 854 | unsigned i = 0; |
| 855 | for (i = 0; i < partition_count; i++) { |
| 856 | dprintf(SPEW, |
| 857 | "ptn[%d]:Name[%s] Size[%llu] Type[%u] First[%llu] Last[%llu]\n", |
| 858 | i, partition_entries[i].name, partition_entries[i].size, |
| 859 | partition_entries[i].dtype, |
| 860 | partition_entries[i].first_lba, |
| 861 | partition_entries[i].last_lba); |
| 862 | } |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 863 | } |
| 864 | |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 865 | static unsigned int |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 866 | partition_verify_mbr_signature(unsigned size, unsigned char *buffer) |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 867 | { |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 868 | /* Avoid checking past end of buffer */ |
| 869 | if ((TABLE_SIGNATURE + 1) > size) { |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 870 | return 1; |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 871 | } |
| 872 | /* Check to see if signature exists */ |
| 873 | if ((buffer[TABLE_SIGNATURE] != MMC_MBR_SIGNATURE_BYTE_0) || |
| 874 | (buffer[TABLE_SIGNATURE + 1] != MMC_MBR_SIGNATURE_BYTE_1)) { |
| 875 | dprintf(CRITICAL, "MBR signature does not match.\n"); |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 876 | return 1; |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 877 | } |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 878 | return 0; |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 879 | } |
| 880 | |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 881 | static unsigned int |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 882 | mbr_partition_get_type(unsigned size, unsigned char *partition, |
| 883 | unsigned int *partition_type) |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 884 | { |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 885 | unsigned int type_offset = TABLE_ENTRY_0 + OFFSET_TYPE; |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 886 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 887 | if (size < type_offset) { |
| 888 | goto end; |
| 889 | } |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 890 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 891 | *partition_type = partition[type_offset]; |
| 892 | end: |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 893 | return 0; |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 894 | } |
| 895 | |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 896 | static unsigned int |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 897 | partition_get_type(unsigned size, unsigned char *partition, |
| 898 | unsigned int *partition_type) |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 899 | { |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 900 | unsigned int ret = 0; |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 901 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 902 | /* |
| 903 | * If the block contains the MBR signature, then it's likely either |
| 904 | * MBR or MBR with protective type (GPT). If the MBR signature is |
| 905 | * not there, then it could be the GPT backup. |
| 906 | */ |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 907 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 908 | /* First check the MBR signature */ |
| 909 | ret = partition_verify_mbr_signature(size, partition); |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 910 | if (!ret) { |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 911 | unsigned int mbr_partition_type = PARTITION_TYPE_MBR; |
Kinson Chik | f1a4351 | 2011-07-14 11:28:39 -0700 | [diff] [blame] | 912 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 913 | /* MBR signature verified. This could be MBR, MBR + EBR, or GPT */ |
| 914 | ret = |
| 915 | mbr_partition_get_type(size, partition, |
| 916 | &mbr_partition_type); |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 917 | if (ret) { |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 918 | dprintf(CRITICAL, "Cannot get TYPE of partition"); |
| 919 | } else if (MBR_PROTECTED_TYPE == mbr_partition_type) { |
| 920 | *partition_type = PARTITION_TYPE_GPT; |
| 921 | } else { |
| 922 | *partition_type = PARTITION_TYPE_MBR; |
| 923 | } |
| 924 | } else { |
| 925 | /* |
| 926 | * This could be the GPT backup. Make that assumption for now. |
| 927 | * Anybody who treats the block as GPT backup should check the |
| 928 | * signature. |
| 929 | */ |
| 930 | *partition_type = PARTITION_TYPE_GPT_BACKUP; |
| 931 | } |
| 932 | return ret; |
Kinson Chik | 66552a8 | 2011-03-29 15:59:06 -0700 | [diff] [blame] | 933 | } |
Kinson Chik | 4d7444f | 2011-09-13 15:48:51 -0700 | [diff] [blame] | 934 | |
| 935 | /* |
| 936 | * Parse the gpt header and get the required header fields |
| 937 | * Return 0 on valid signature |
| 938 | */ |
Channagoud Kadabi | 0e33285 | 2013-04-19 12:55:53 -0700 | [diff] [blame^] | 939 | static unsigned int |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 940 | partition_parse_gpt_header(unsigned char *buffer, |
| 941 | unsigned long long *first_usable_lba, |
| 942 | unsigned int *partition_entry_size, |
| 943 | unsigned int *header_size, |
| 944 | unsigned int *max_partition_count) |
Kinson Chik | 4d7444f | 2011-09-13 15:48:51 -0700 | [diff] [blame] | 945 | { |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 946 | /* Check GPT Signature */ |
| 947 | if (((uint32_t *) buffer)[0] != GPT_SIGNATURE_2 || |
| 948 | ((uint32_t *) buffer)[1] != GPT_SIGNATURE_1) |
| 949 | return 1; |
Kinson Chik | 4d7444f | 2011-09-13 15:48:51 -0700 | [diff] [blame] | 950 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 951 | *header_size = GET_LWORD_FROM_BYTE(&buffer[HEADER_SIZE_OFFSET]); |
| 952 | *first_usable_lba = |
| 953 | GET_LLWORD_FROM_BYTE(&buffer[FIRST_USABLE_LBA_OFFSET]); |
| 954 | *max_partition_count = |
| 955 | GET_LWORD_FROM_BYTE(&buffer[PARTITION_COUNT_OFFSET]); |
| 956 | *partition_entry_size = |
| 957 | GET_LWORD_FROM_BYTE(&buffer[PENTRY_SIZE_OFFSET]); |
Kinson Chik | 4d7444f | 2011-09-13 15:48:51 -0700 | [diff] [blame] | 958 | |
Ajay Dudani | b01e506 | 2011-12-03 23:23:42 -0800 | [diff] [blame] | 959 | return 0; |
Kinson Chik | 4d7444f | 2011-09-13 15:48:51 -0700 | [diff] [blame] | 960 | } |