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/*
* This is from the Android Project,
* Repository: https://android.googlesource.com/platform/bootable/recovery
* File: bootloader_message/include/bootloader_message/bootloader_message.h
* Commit: c784ce50e8c10eaf70e1f97e24e8324aef45faf5
*
* Copyright (C) 2008 The Android Open Source Project
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef __ANDROID_BOOTLOADER_MESSAGE_H
#define __ANDROID_BOOTLOADER_MESSAGE_H
/* compiler.h defines the types that otherwise are included from stdint.h and
* stddef.h
*/
#include <compiler.h>
/* Spaces used by misc partition are as below:
* 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. */
static const size_t BOOTLOADER_MESSAGE_OFFSET_IN_MISC = 0;
static const size_t WIPE_PACKAGE_OFFSET_IN_MISC = 16 * 1024;
/* 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
* each other.
*
* The command field is updated by linux when it wants to
* reboot into recovery or to update radio or bootloader firmware.
* It is also updated by the bootloader when firmware update
* is complete (to boot into recovery for any final cleanup)
*
* 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
* other way around.
*
* The stage field is written by packages which restart themselves
* multiple times, so that the UI can reflect which invocation of the
* package it is. If the value is of the format "#/#" (eg, "1/3"),
* the UI will add a simple indicator of that status.
*
* 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];
/* 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];
};
/**
* We must be cautious when changing the bootloader_message struct size,
* because A/B-specific fields may end up with different offsets.
*/
#if (__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.
*
* The update_channel field is used to store the Omaha update channel
* if update_engine is compiled with Omaha support.
*/
struct bootloader_message_ab {
struct bootloader_message message;
char slot_suffix[32];
char update_channel[128];
/* Round up the entire struct to 4096-byte. */
char reserved[1888];
};
/**
* Be cautious about the struct size change, in case we put anything post
* bootloader_message_ab struct (b/29159185).
*/
#if (__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
#ifndef __UBOOT__
#ifdef __cplusplus
#include <string>
#include <vector>
/* Return the block device name for the bootloader message partition and waits
* for the device for up to 10 seconds. In case of error returns the empty
* string. */
std::string get_bootloader_message_blk_device(std::string* err);
/* 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);
/* Write bootloader message (boots into recovery with the options) to the specific BCB device. Will
* set the command and recovery fields, and reset the rest. */
bool write_bootloader_message_to(const std::vector<std::string>& options,
const std::string& misc_blk_device, 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);
/* Update bootloader message (boots into recovery with the |options|) in |boot|. Will only update
* the command and recovery fields. */
bool update_bootloader_message_in_struct(bootloader_message* boot,
const std::vector<std::string>& options);
/* 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);
/* 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
#include <stdbool.h>
/* C Interface. */
bool write_bootloader_message(const char* options);
bool write_reboot_bootloader(void);
#endif /* ifdef __cplusplus */
#endif /* __UBOOT__ */
#endif /* __ANDROID_BOOTLOADER_MESSAGE_H */
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