diff options
Diffstat (limited to 'bootloader_message/include/bootloader_message/bootloader_message.h')
| -rw-r--r-- | bootloader_message/include/bootloader_message/bootloader_message.h | 170 |
1 files changed, 151 insertions, 19 deletions
diff --git a/bootloader_message/include/bootloader_message/bootloader_message.h b/bootloader_message/include/bootloader_message/bootloader_message.h index e0fc2cd8a..4ad18f2d9 100644 --- a/bootloader_message/include/bootloader_message/bootloader_message.h +++ b/bootloader_message/include/bootloader_message/bootloader_message.h @@ -17,23 +17,21 @@ #ifndef _BOOTLOADER_MESSAGE_H #define _BOOTLOADER_MESSAGE_H +#include <assert.h> #include <stddef.h> +#include <stdint.h> // Spaces used by misc partition are as below: -// 0 - 2K Bootloader Message -// 2K - 16K Used by Vendor's bootloader +// 0 - 2K For bootloader_message +// 2K - 16K Used by Vendor's bootloader (the 2K - 4K range may be optionally used +// as bootloader_message_ab struct) // 16K - 64K Used by uncrypt and recovery to store wipe_package for A/B devices // Note that these offsets are admitted by bootloader,recovery and uncrypt, so they // are not configurable without changing all of them. -#ifdef BOARD_RECOVERY_BLDRMSG_OFFSET -static const size_t BOOTLOADER_MESSAGE_OFFSET_IN_MISC = BOARD_RECOVERY_BLDRMSG_OFFSET; -static const size_t WIPE_PACKAGE_OFFSET_IN_MISC = 16 * 1024 + BOOTLOADER_MESSAGE_OFFSET_IN_MISC; -#else static const size_t BOOTLOADER_MESSAGE_OFFSET_IN_MISC = 0; static const size_t WIPE_PACKAGE_OFFSET_IN_MISC = 16 * 1024; -#endif -/* Bootloader Message +/* Bootloader Message (2-KiB) * * This structure describes the content of a block in flash * that is used for recovery and the bootloader to talk to @@ -44,8 +42,9 @@ static const size_t WIPE_PACKAGE_OFFSET_IN_MISC = 16 * 1024; * It is also updated by the bootloader when firmware update * is complete (to boot into recovery for any final cleanup) * - * The status field is written by the bootloader after the - * completion of an "update-radio" or "update-hboot" command. + * The status field was used by the bootloader after the completion + * of an "update-radio" or "update-hboot" command, which has been + * deprecated since Froyo. * * The recovery field is only written by linux and used * for the system to send a message to recovery or the @@ -56,18 +55,17 @@ static const size_t WIPE_PACKAGE_OFFSET_IN_MISC = 16 * 1024; * package it is. If the value is of the format "#/#" (eg, "1/3"), * the UI will add a simple indicator of that status. * - * The slot_suffix field is used for A/B implementations where the - * bootloader does not set the androidboot.ro.boot.slot_suffix kernel - * commandline parameter. This is used by fs_mgr to mount /system and - * other partitions with the slotselect flag set in fstab. A/B - * implementations are free to use all 32 bytes and may store private - * data past the first NUL-byte in this field. + * We used to have slot_suffix field for A/B boot control metadata in + * this struct, which gets unintentionally cleared by recovery or + * uncrypt. Move it into struct bootloader_message_ab to avoid the + * issue. */ struct bootloader_message { char command[32]; char status[32]; char recovery[768]; +#ifdef USE_OLD_BOOTLOADER_MESSAGE // The 'recovery' field used to be 1024 bytes. It has only ever // been used to store the recovery command line, so 768 bytes // should be plenty. We carve off the last 256 bytes to store the @@ -76,23 +74,156 @@ struct bootloader_message { char stage[32]; char slot_suffix[32]; char reserved[192]; +#else + // The 'recovery' field used to be 1024 bytes. It has only ever + // been used to store the recovery command line, so 768 bytes + // should be plenty. We carve off the last 256 bytes to store the + // stage string (for multistage packages) and possible future + // expansion. + char stage[32]; + + // The 'reserved' field used to be 224 bytes when it was initially + // carved off from the 1024-byte recovery field. Bump it up to + // 1184-byte so that the entire bootloader_message struct rounds up + // to 2048-byte. + char reserved[1184]; +#endif +}; + +/** + * We must be cautious when changing the bootloader_message struct size, + * because A/B-specific fields may end up with different offsets. + */ +#if !defined(USE_OLD_BOOTLOADER_MESSAGE) && ((__STDC_VERSION__ >= 201112L) || defined(__cplusplus)) +static_assert(sizeof(struct bootloader_message) == 2048, + "struct bootloader_message size changes, which may break A/B devices"); +#endif + +/** + * The A/B-specific bootloader message structure (4-KiB). + * + * We separate A/B boot control metadata from the regular bootloader + * message struct and keep it here. Everything that's A/B-specific + * stays after struct bootloader_message, which should be managed by + * the A/B-bootloader or boot control HAL. + * + * The slot_suffix field is used for A/B implementations where the + * bootloader does not set the androidboot.ro.boot.slot_suffix kernel + * commandline parameter. This is used by fs_mgr to mount /system and + * other partitions with the slotselect flag set in fstab. A/B + * implementations are free to use all 32 bytes and may store private + * data past the first NUL-byte in this field. It is encouraged, but + * not mandatory, to use 'struct bootloader_control' described below. + */ +struct bootloader_message_ab { + struct bootloader_message message; + char slot_suffix[32]; + + // Round up the entire struct to 4096-byte. + char reserved[2016]; }; +/** + * Be cautious about the struct size change, in case we put anything post + * bootloader_message_ab struct (b/29159185). + */ +#if !defined(USE_OLD_BOOTLOADER_MESSAGE) && ((__STDC_VERSION__ >= 201112L) || defined(__cplusplus)) +static_assert(sizeof(struct bootloader_message_ab) == 4096, + "struct bootloader_message_ab size changes"); +#endif + +#define BOOT_CTRL_MAGIC 0x42414342 /* Bootloader Control AB */ +#define BOOT_CTRL_VERSION 1 + +struct slot_metadata { + // Slot priority with 15 meaning highest priority, 1 lowest + // priority and 0 the slot is unbootable. + uint8_t priority : 4; + // Number of times left attempting to boot this slot. + uint8_t tries_remaining : 3; + // 1 if this slot has booted successfully, 0 otherwise. + uint8_t successful_boot : 1; + // 1 if this slot is corrupted from a dm-verity corruption, 0 + // otherwise. + uint8_t verity_corrupted : 1; + // Reserved for further use. + uint8_t reserved : 7; +} __attribute__((packed)); + +/* Bootloader Control AB + * + * This struct can be used to manage A/B metadata. It is designed to + * be put in the 'slot_suffix' field of the 'bootloader_message' + * structure described above. It is encouraged to use the + * 'bootloader_control' structure to store the A/B metadata, but not + * mandatory. + */ +struct bootloader_control { + // NUL terminated active slot suffix. + char slot_suffix[4]; + // Bootloader Control AB magic number (see BOOT_CTRL_MAGIC). + uint32_t magic; + // Version of struct being used (see BOOT_CTRL_VERSION). + uint8_t version; + // Number of slots being managed. + uint8_t nb_slot : 3; + // Number of times left attempting to boot recovery. + uint8_t recovery_tries_remaining : 3; + // Ensure 4-bytes alignment for slot_info field. + uint8_t reserved0[2]; + // Per-slot information. Up to 4 slots. + struct slot_metadata slot_info[4]; + // Reserved for further use. + uint8_t reserved1[8]; + // CRC32 of all 28 bytes preceding this field (little endian + // format). + uint32_t crc32_le; +} __attribute__((packed)); + +#if (__STDC_VERSION__ >= 201112L) || defined(__cplusplus) +static_assert(sizeof(struct bootloader_control) == + sizeof(((struct bootloader_message_ab *)0)->slot_suffix), + "struct bootloader_control has wrong size"); +#endif + #ifdef __cplusplus #include <string> #include <vector> +// Read bootloader message into boot. Error message will be set in err. bool read_bootloader_message(bootloader_message* boot, std::string* err); + +// Read bootloader message from the specified misc device into boot. +bool read_bootloader_message_from(bootloader_message* boot, const std::string& misc_blk_device, + std::string* err); + +// Write bootloader message to BCB. bool write_bootloader_message(const bootloader_message& boot, std::string* err); + +// Write bootloader message to the specified BCB device. +bool write_bootloader_message_to(const bootloader_message& boot, + const std::string& misc_blk_device, std::string* err); + +// Write bootloader message (boots into recovery with the options) to BCB. Will +// set the command and recovery fields, and reset the rest. bool write_bootloader_message(const std::vector<std::string>& options, std::string* err); + +// Update bootloader message (boots into recovery with the options) to BCB. Will +// only update the command and recovery fields. +bool update_bootloader_message(const std::vector<std::string>& options, std::string* err); + +// Clear BCB. bool clear_bootloader_message(std::string* err); +// Writes the reboot-bootloader reboot reason to the bootloader_message. +bool write_reboot_bootloader(std::string* err); + +// Read the wipe package from BCB (from offset WIPE_PACKAGE_OFFSET_IN_MISC). bool read_wipe_package(std::string* package_data, size_t size, std::string* err); -bool write_wipe_package(const std::string& package_data, std::string* err); -void set_misc_device(std::string name); -void get_args(int *argc, char ***argv); +// Write the wipe package into BCB (to offset WIPE_PACKAGE_OFFSET_IN_MISC). +bool write_wipe_package(const std::string& package_data, std::string* err); #else @@ -100,6 +231,7 @@ void get_args(int *argc, char ***argv); // C Interface. bool write_bootloader_message(const char* options); +bool write_reboot_bootloader(void); #endif // ifdef __cplusplus |