diff options
Diffstat (limited to 'boot/android_ab.c')
| -rw-r--r-- | boot/android_ab.c | 116 |
1 files changed, 95 insertions, 21 deletions
diff --git a/boot/android_ab.c b/boot/android_ab.c index 1196a189ed5..a287eac04fe 100644 --- a/boot/android_ab.c +++ b/boot/android_ab.c @@ -13,13 +13,13 @@ #include <u-boot/crc.h> /** - * Compute the CRC-32 of the bootloader control struct. + * ab_control_compute_crc() - Compute the CRC32 of the bootloader control. + * + * @abc: Bootloader control block * * Only the bytes up to the crc32_le field are considered for the CRC-32 * calculation. * - * @param[in] abc bootloader control block - * * Return: crc32 sum */ static uint32_t ab_control_compute_crc(struct bootloader_control *abc) @@ -28,14 +28,14 @@ static uint32_t ab_control_compute_crc(struct bootloader_control *abc) } /** - * Initialize bootloader_control to the default value. + * ab_control_default() - Initialize bootloader_control to the default value. + * + * @abc: Bootloader control block * * It allows us to boot all slots in order from the first one. This value * should be used when the bootloader message is corrupted, but not when * a valid message indicates that all slots are unbootable. * - * @param[in] abc bootloader control block - * * Return: 0 on success and a negative on error */ static int ab_control_default(struct bootloader_control *abc) @@ -52,7 +52,7 @@ static int ab_control_default(struct bootloader_control *abc) if (!abc) return -EFAULT; - memcpy(abc->slot_suffix, "a\0\0\0", 4); + memcpy(abc->slot_suffix, "_a\0\0", 4); abc->magic = BOOT_CTRL_MAGIC; abc->version = BOOT_CTRL_VERSION; abc->nb_slot = NUM_SLOTS; @@ -67,7 +67,13 @@ static int ab_control_default(struct bootloader_control *abc) } /** - * Load the boot_control struct from disk into newly allocated memory. + * ab_control_create_from_disk() - Load the boot_control from disk into memory. + * + * @dev_desc: Device where to read the boot_control struct from + * @part_info: Partition in 'dev_desc' where to read from, normally + * the "misc" partition should be used + * @abc: pointer to pointer to bootloader_control data + * @offset: boot_control struct offset * * This function allocates and returns an integer number of disk blocks, * based on the block size of the passed device to help performing a @@ -75,10 +81,6 @@ static int ab_control_default(struct bootloader_control *abc) * The boot_control struct offset (2 KiB) must be a multiple of the device * block size, for simplicity. * - * @param[in] dev_desc Device where to read the boot_control struct from - * @param[in] part_info Partition in 'dev_desc' where to read from, normally - * the "misc" partition should be used - * @param[out] pointer to pointer to bootloader_control data * Return: 0 on success and a negative on error */ static int ab_control_create_from_disk(struct blk_desc *dev_desc, @@ -122,15 +124,17 @@ static int ab_control_create_from_disk(struct blk_desc *dev_desc, } /** - * Store the loaded boot_control block. + * ab_control_store() - Store the loaded boot_control block. + * + * @dev_desc: Device where we should write the boot_control struct + * @part_info: Partition on the 'dev_desc' where to write + * @abc Pointer to the boot control struct and the extra bytes after + * it up to the nearest block boundary + * @offset: boot_control struct offset * * Store back to the same location it was read from with * ab_control_create_from_misc(). * - * @param[in] dev_desc Device where we should write the boot_control struct - * @param[in] part_info Partition on the 'dev_desc' where to write - * @param[in] abc Pointer to the boot control struct and the extra bytes after - * it up to the nearest block boundary * Return: 0 on success and a negative on error */ static int ab_control_store(struct blk_desc *dev_desc, @@ -160,12 +164,13 @@ static int ab_control_store(struct blk_desc *dev_desc, } /** - * Compare two slots. + * ab_compare_slots() - Compare two slots. + * + * @a: The first bootable slot metadata + * @b: The second bootable slot metadata * * The function determines slot which is should we boot from among the two. * - * @param[in] a The first bootable slot metadata - * @param[in] b The second bootable slot metadata * Return: Negative if the slot "a" is better, positive of the slot "b" is * better or 0 if they are equally good. */ @@ -323,7 +328,8 @@ int ab_select_slot(struct blk_desc *dev_desc, struct disk_partition *part_info, * or the device tree. */ memset(slot_suffix, 0, sizeof(slot_suffix)); - slot_suffix[0] = BOOT_SLOT_NAME(slot); + slot_suffix[0] = '_'; + slot_suffix[1] = BOOT_SLOT_NAME(slot); if (memcmp(abc->slot_suffix, slot_suffix, sizeof(slot_suffix))) { memcpy(abc->slot_suffix, slot_suffix, @@ -367,3 +373,71 @@ int ab_select_slot(struct blk_desc *dev_desc, struct disk_partition *part_info, return slot; } + +int ab_dump_abc(struct blk_desc *dev_desc, struct disk_partition *part_info) +{ + struct bootloader_control *abc; + u32 crc32_le; + int i, ret; + struct slot_metadata *slot; + + if (!dev_desc || !part_info) { + log_err("ANDROID: Empty device descriptor or partition info\n"); + return -EINVAL; + } + + ret = ab_control_create_from_disk(dev_desc, part_info, &abc, 0); + if (ret < 0) { + log_err("ANDROID: Cannot create bcb from disk %d\n", ret); + return ret; + } + + if (abc->magic != BOOT_CTRL_MAGIC) { + log_err("ANDROID: Unknown A/B metadata: %.8x\n", abc->magic); + ret = -ENODATA; + goto error; + } + + if (abc->version > BOOT_CTRL_VERSION) { + log_err("ANDROID: Unsupported A/B metadata version: %.8x\n", + abc->version); + ret = -ENODATA; + goto error; + } + + if (abc->nb_slot > ARRAY_SIZE(abc->slot_info)) { + log_err("ANDROID: Wrong number of slots %u, expected %zu\n", + abc->nb_slot, ARRAY_SIZE(abc->slot_info)); + ret = -ENODATA; + goto error; + } + + printf("Bootloader Control: [%s]\n", part_info->name); + printf("Active Slot: %s\n", abc->slot_suffix); + printf("Magic Number: 0x%x\n", abc->magic); + printf("Version: %u\n", abc->version); + printf("Number of Slots: %u\n", abc->nb_slot); + printf("Recovery Tries Remaining: %u\n", abc->recovery_tries_remaining); + + printf("CRC: 0x%.8x", abc->crc32_le); + + crc32_le = ab_control_compute_crc(abc); + if (abc->crc32_le != crc32_le) + printf(" (Invalid, Expected: 0x%.8x)\n", crc32_le); + else + printf(" (Valid)\n"); + + for (i = 0; i < abc->nb_slot; ++i) { + slot = &abc->slot_info[i]; + printf("\nSlot[%d] Metadata:\n", i); + printf("\t- Priority: %u\n", slot->priority); + printf("\t- Tries Remaining: %u\n", slot->tries_remaining); + printf("\t- Successful Boot: %u\n", slot->successful_boot); + printf("\t- Verity Corrupted: %u\n", slot->verity_corrupted); + } + +error: + free(abc); + + return ret; +} |