250 lines
9.6 KiB
C++
250 lines
9.6 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _BOOTLOADER_MESSAGE_H
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#define _BOOTLOADER_MESSAGE_H
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#include <assert.h>
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#include <stddef.h>
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#include <stdint.h>
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// Spaces used by misc partition are as below:
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// 0 - 2K For bootloader_message
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// 2K - 16K Used by Vendor's bootloader (the 2K - 4K range may be optionally used
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// as bootloader_message_ab struct)
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// 16K - 64K Used by uncrypt and recovery to store wipe_package for A/B devices
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// Note that these offsets are admitted by bootloader,recovery and uncrypt, so they
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// are not configurable without changing all of them.
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static const size_t BOOTLOADER_MESSAGE_OFFSET_IN_MISC = 0;
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static const size_t WIPE_PACKAGE_OFFSET_IN_MISC = 16 * 1024;
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/* Bootloader Message (2-KiB)
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*
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* This structure describes the content of a block in flash
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* that is used for recovery and the bootloader to talk to
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* each other.
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*
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* The command field is updated by linux when it wants to
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* reboot into recovery or to update radio or bootloader firmware.
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* It is also updated by the bootloader when firmware update
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* is complete (to boot into recovery for any final cleanup)
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*
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* The status field was used by the bootloader after the completion
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* of an "update-radio" or "update-hboot" command, which has been
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* deprecated since Froyo.
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*
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* The recovery field is only written by linux and used
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* for the system to send a message to recovery or the
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* other way around.
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*
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* The stage field is written by packages which restart themselves
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* multiple times, so that the UI can reflect which invocation of the
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* package it is. If the value is of the format "#/#" (eg, "1/3"),
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* the UI will add a simple indicator of that status.
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*
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* We used to have slot_suffix field for A/B boot control metadata in
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* this struct, which gets unintentionally cleared by recovery or
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* uncrypt. Move it into struct bootloader_message_ab to avoid the
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* issue.
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*/
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struct bootloader_message {
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char command[32];
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char status[32];
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char recovery[768];
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// The 'recovery' field used to be 1024 bytes. It has only ever
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// been used to store the recovery command line, so 768 bytes
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// should be plenty. We carve off the last 256 bytes to store the
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// stage string (for multistage packages) and possible future
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// expansion.
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char stage[32];
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// The 'reserved' field used to be 224 bytes when it was initially
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// carved off from the 1024-byte recovery field. Bump it up to
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// 1184-byte so that the entire bootloader_message struct rounds up
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// to 2048-byte.
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char reserved[1184];
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};
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/**
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* We must be cautious when changing the bootloader_message struct size,
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* because A/B-specific fields may end up with different offsets.
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*/
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#if (__STDC_VERSION__ >= 201112L) || defined(__cplusplus)
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static_assert(sizeof(struct bootloader_message) == 2048,
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"struct bootloader_message size changes, which may break A/B devices");
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#endif
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/**
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* The A/B-specific bootloader message structure (4-KiB).
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*
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* We separate A/B boot control metadata from the regular bootloader
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* message struct and keep it here. Everything that's A/B-specific
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* stays after struct bootloader_message, which should be managed by
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* the A/B-bootloader or boot control HAL.
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*
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* The slot_suffix field is used for A/B implementations where the
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* bootloader does not set the androidboot.ro.boot.slot_suffix kernel
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* commandline parameter. This is used by fs_mgr to mount /system and
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* other partitions with the slotselect flag set in fstab. A/B
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* implementations are free to use all 32 bytes and may store private
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* data past the first NUL-byte in this field. It is encouraged, but
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* not mandatory, to use 'struct bootloader_control' described below.
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*
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* The update_channel field is used to store the Omaha update channel
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* if update_engine is compiled with Omaha support.
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*/
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struct bootloader_message_ab {
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struct bootloader_message message;
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char slot_suffix[32];
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char update_channel[128];
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// Round up the entire struct to 4096-byte.
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char reserved[1888];
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};
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/**
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* Be cautious about the struct size change, in case we put anything post
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* bootloader_message_ab struct (b/29159185).
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*/
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#if (__STDC_VERSION__ >= 201112L) || defined(__cplusplus)
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static_assert(sizeof(struct bootloader_message_ab) == 4096,
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"struct bootloader_message_ab size changes");
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#endif
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#define BOOT_CTRL_MAGIC 0x42414342 /* Bootloader Control AB */
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#define BOOT_CTRL_VERSION 1
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struct slot_metadata {
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// Slot priority with 15 meaning highest priority, 1 lowest
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// priority and 0 the slot is unbootable.
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uint8_t priority : 4;
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// Number of times left attempting to boot this slot.
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uint8_t tries_remaining : 3;
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// 1 if this slot has booted successfully, 0 otherwise.
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uint8_t successful_boot : 1;
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// 1 if this slot is corrupted from a dm-verity corruption, 0
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// otherwise.
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uint8_t verity_corrupted : 1;
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// Reserved for further use.
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uint8_t reserved : 7;
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} __attribute__((packed));
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/* Bootloader Control AB
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*
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* This struct can be used to manage A/B metadata. It is designed to
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* be put in the 'slot_suffix' field of the 'bootloader_message'
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* structure described above. It is encouraged to use the
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* 'bootloader_control' structure to store the A/B metadata, but not
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* mandatory.
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*/
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struct bootloader_control {
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// NUL terminated active slot suffix.
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char slot_suffix[4];
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// Bootloader Control AB magic number (see BOOT_CTRL_MAGIC).
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uint32_t magic;
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// Version of struct being used (see BOOT_CTRL_VERSION).
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uint8_t version;
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// Number of slots being managed.
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uint8_t nb_slot : 3;
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// Number of times left attempting to boot recovery.
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uint8_t recovery_tries_remaining : 3;
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// Ensure 4-bytes alignment for slot_info field.
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uint8_t reserved0[2];
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// Per-slot information. Up to 4 slots.
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struct slot_metadata slot_info[4];
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// Reserved for further use.
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uint8_t reserved1[8];
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// CRC32 of all 28 bytes preceding this field (little endian
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// format).
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uint32_t crc32_le;
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} __attribute__((packed));
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#if (__STDC_VERSION__ >= 201112L) || defined(__cplusplus)
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static_assert(sizeof(struct bootloader_control) ==
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sizeof(((struct bootloader_message_ab *)0)->slot_suffix),
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"struct bootloader_control has wrong size");
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#endif
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#ifdef __cplusplus
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#include <string>
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#include <vector>
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// Return the block device name for the bootloader message partition and waits
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// for the device for up to 10 seconds. In case of error returns the empty
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// string.
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std::string get_bootloader_message_blk_device(std::string* err);
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// Read bootloader message into boot. Error message will be set in err.
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bool read_bootloader_message(bootloader_message* boot, std::string* err);
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// Read bootloader message from the specified misc device into boot.
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bool read_bootloader_message_from(bootloader_message* boot, const std::string& misc_blk_device,
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std::string* err);
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// Read bootloader control block from the specified misc device into boot_ctrl.
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bool read_bootloader_control_from(bootloader_control* boot_ctrl, const std::string& misc_blk_device,
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std::string* err);
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// Write bootloader message to BCB.
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bool write_bootloader_message(const bootloader_message& boot, std::string* err);
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// Write bootloader message to the specified BCB device.
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bool write_bootloader_message_to(const bootloader_message& boot,
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const std::string& misc_blk_device, std::string* err);
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// Write bootloader message (boots into recovery with the options) to BCB. Will
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// set the command and recovery fields, and reset the rest.
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bool write_bootloader_message(const std::vector<std::string>& options, std::string* err);
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// Write bootloader control block to the specified BCB device.
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bool write_bootloader_control_to(const bootloader_control* boot_ctrl, const std::string& misc_blk_device,
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std::string* err);
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// Update bootloader message (boots into recovery with the options) to BCB. Will
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// only update the command and recovery fields.
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bool update_bootloader_message(const std::vector<std::string>& options, std::string* err);
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// Update bootloader message (boots into recovery with the |options|) in |boot|. Will only update
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// the command and recovery fields.
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bool update_bootloader_message_in_struct(bootloader_message* boot,
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const std::vector<std::string>& options);
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// Clear BCB.
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bool clear_bootloader_message(std::string* err);
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// Writes the reboot-bootloader reboot reason to the bootloader_message.
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bool write_reboot_bootloader(std::string* err);
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// Read the wipe package from BCB (from offset WIPE_PACKAGE_OFFSET_IN_MISC).
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bool read_wipe_package(std::string* package_data, size_t size, std::string* err);
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// Write the wipe package into BCB (to offset WIPE_PACKAGE_OFFSET_IN_MISC).
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bool write_wipe_package(const std::string& package_data, std::string* err);
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#else
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#include <stdbool.h>
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// C Interface.
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bool write_bootloader_message(const char* options);
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bool write_reboot_bootloader(void);
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#endif // ifdef __cplusplus
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#endif // _BOOTLOADER_MESSAGE_H
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