diff --git a/boot/1.0/IBootControl.hal b/boot/1.0/IBootControl.hal
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+++ b/boot/1.0/IBootControl.hal
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+/*
+ * Copyright 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.boot@1.0;
+
+/**
+ * The Boot Control HAL is designed to allow for managing sets of redundant
+ * partitions, called slots, that can be booted from independently. Slots
+ * are sets of partitions whose names differ only by a given suffix.
+ * They are identified here by a 0 indexed number and associated with their
+ * suffix, which is appended to the base name for any particular partition
+ * to find the one associated with that slot.
+ * The primary use of this set up is to allow for background updates while
+ * the device is running, and to provide a fallback in the event that the
+ * update fails.
+ */
+interface IBootControl {
+  /**
+   * getNumberSlots() returns the number of available slots.
+   * For instance, a system with a single set of partitions must return
+   * 1, a system with A/B must return 2, A/B/C -> 3 and so on. A system with
+   * less than two slots doesn't support background updates, for example if
+   * running from a virtual machine with only one copy of each partition for the
+   * purpose of testing.
+   */
+  getNumberSlots() generates (uint32_t numSlots);
+
+  /**
+   * getCurrentSlot() returns the slot number of that the current boot is booted
+   * from, for example slot number 0 (Slot A). It is assumed that if the current
+   * slot is A, then the block devices underlying B can be accessed directly
+   * without any risk of corruption.
+   * The returned value is always guaranteed to be strictly less than the
+   * value returned by getNumberSlots. Slots start at 0 and finish at
+   * getNumberSlots() - 1. The value returned here must match the suffix passed
+   * from the bootloader, regardless of which slot is active or successful.
+   */
+  getCurrentSlot() generates (Slot slot);
+
+  /**
+   * markBootSuccessful() marks the current slot as having booted successfully.
+   *
+   * Returns whether the command succeeded.
+   */
+  markBootSuccessful() generates (CommandResult error);
+
+  /**
+   * setActiveBootSlot() marks the slot passed in parameter as the active boot
+   * slot (see getCurrentSlot for an explanation of the "slot" parameter). This
+   * overrides any previous call to setSlotAsUnbootable.
+   * Returns whether the command succeeded.
+   */
+  setActiveBootSlot(Slot slot) generates (CommandResult error);
+
+  /**
+   * setSlotAsUnbootable() marks the slot passed in parameter as
+   * an unbootable. This can be used while updating the contents of the slot's
+   * partitions, so that the system must not attempt to boot a known bad set up.
+   * Returns whether the command succeeded.
+   */
+  setSlotAsUnbootable(Slot slot) generates (CommandResult error);
+
+  /**
+   * isSlotBootable() returns if the slot passed in parameter is bootable. Note
+   * that slots can be made unbootable by both the bootloader and by the OS
+   * using setSlotAsUnbootable.
+   * Returns TRUE if the slot is bootable, FALSE if it's not, and INVALID_SLOT
+   * if slot does not exist.
+   */
+  isSlotBootable(Slot slot) generates (BoolResult bootable);
+
+  /**
+   * isSlotMarkedSucessful() returns if the slot passed in parameter has been
+   * marked as successful using markBootSuccessful. Note that only the current
+   * slot can be marked as successful but any slot can be queried.
+   * Returns TRUE if the slot has been marked as successful, FALSE if it has
+   * not, and INVALID_SLOT if the slot does not exist.
+   */
+  isSlotMarkedSuccessful(Slot slot) generates (BoolResult successful);
+
+  /**
+   * getSuffix() returns the string suffix used by partitions that correspond to
+   * the slot number passed in as a parameter. The bootloader must pass the
+   * suffix of the currently active slot either through a kernel command line
+   * property at androidboot.slot_suffix, or the device tree at
+   * /firmware/android/slot_suffix.
+   * Returns the empty string "" if slot does not match an existing slot.
+   */
+  getSuffix(Slot slot) generates (string slotSuffix);
+};
+