Merge "bootloader_message: Carve out space reserved for system."

  if (misc_blk_device.empty()) {

    return false;

  }

  static constexpr size_t kMaximumWipePackageSize =

      SYSTEM_SPACE_OFFSET_IN_MISC - WIPE_PACKAGE_OFFSET_IN_MISC;

  if (package_data.size() > kMaximumWipePackageSize) {

    *err = "Wipe package size " + std::to_string(package_data.size()) + " exceeds " +

           std::to_string(kMaximumWipePackageSize) + " bytes";

    return false;

  }

  return write_misc_partition(package_data.data(), package_data.size(), misc_blk_device,

                              WIPE_PACKAGE_OFFSET_IN_MISC, err);

}

// 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

// 16K - 32K    Used by uncrypt and recovery to store wipe_package for A/B devices

// 32K - 64K    System space, used for miscellanious AOSP features. See below.

// Note that these offsets are admitted by bootloader,recovery and uncrypt, so they

// are not configurable without changing all of them.

constexpr size_t BOOTLOADER_MESSAGE_OFFSET_IN_MISC = 0;

constexpr size_t VENDOR_SPACE_OFFSET_IN_MISC = 2 * 1024;

constexpr size_t WIPE_PACKAGE_OFFSET_IN_MISC = 16 * 1024;

constexpr size_t SYSTEM_SPACE_OFFSET_IN_MISC = 32 * 1024;

constexpr size_t SYSTEM_SPACE_SIZE_IN_MISC = 32 * 1024;

/* Bootloader Message (2-KiB)

 *