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+/*
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+ * This is from the Android Project,
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+ * Repository: https://android.googlesource.com/platform/bootable/recovery
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+ * File: bootloader_message/include/bootloader_message/bootloader_message.h
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+ * Commit: c784ce50e8c10eaf70e1f97e24e8324aef45faf5
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+ *
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+ * Copyright (C) 2008 The Android Open Source Project
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+ *
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+ * SPDX-License-Identifier: BSD-3-Clause
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+ */
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+
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+#ifndef __ANDROID_BOOTLOADER_MESSAGE_H
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+#define __ANDROID_BOOTLOADER_MESSAGE_H
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+
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+/* compiler.h defines the types that otherwise are included from stdint.h and
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+ * stddef.h
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+ */
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+#include <compiler.h>
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+
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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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+
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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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+
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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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+
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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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+/**
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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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+/**
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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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+
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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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+/**
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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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+
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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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+
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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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+
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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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+
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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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+
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+#ifndef __UBOOT__
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+
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+#ifdef __cplusplus
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+
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+#include <string>
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+#include <vector>
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+/* Write bootloader message (boots into recovery with the options) to the specific BCB device. Will
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+ * set the command and recovery fields, and reset the rest. */
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+bool write_bootloader_message_to(const std::vector<std::string>& options,
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+ const std::string& misc_blk_device, std::string* err);
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+
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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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+
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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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+
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+/* Clear BCB. */
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+bool clear_bootloader_message(std::string* err);
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+
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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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+
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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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+
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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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+
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+#else
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+
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+#include <stdbool.h>
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+
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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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+
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+#endif /* ifdef __cplusplus */
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+
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+#endif /* __UBOOT__ */
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+
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+#endif /* __ANDROID_BOOTLOADER_MESSAGE_H */
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