boot/1.1/IBootControl.hal

/*
 * Copyright 2019 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@1.1;

import @1.0::IBootControl;

interface IBootControl extends @1.0::IBootControl {
    /**
     * Sets whether a snapshot-merge of any dynamic partition is in progress.
     *
     * After the merge status is set to a given value, subsequent calls to
     * getSnapshotMergeStatus must return the set value.
     *
     * The merge status must be persistent across reboots. That is, getSnapshotMergeStatus
     * must return the same value after a reboot if the merge status is not altered in any way
     * (e.g. set by setSnapshotMergeStatus or set to CANCELLED by bootloader).
     *
     * Read/write access to the merge status must be atomic. When the HAL is processing a
     * setSnapshotMergeStatus call, all subsequent calls to getSnapshotMergeStatus must block until
     * setSnapshotMergeStatus has returned.
     *
     * A MERGING state indicates that dynamic partitions are partially comprised by blocks in the
     * userdata partition.
     *
     * When the merge status is set to MERGING, the following operations must be prohibited from the
     * bootloader:
     *  - Flashing or erasing "userdata" or "metadata".
     *
     * The following operations may be prohibited when the status is set to MERGING. If not
     * prohibited, it is recommended that the user receive a warning.
     *  - Changing the active slot (e.g. via "fastboot set_active")
     *
     * @param status Merge status.
     *
     * @return success True on success, false otherwise.
     */
    setSnapshotMergeStatus(MergeStatus status) generates (bool success);

    /**
     * Returns whether a snapshot-merge of any dynamic partition is in progress.
     *
     * This function must return the merge status set by the last setSnapshotMergeStatus call and
     * recorded by the bootloader with one exception. If the partitions are being flashed from the
     * bootloader such that the pending merge must be canceled (for example, if the super partition
     * is being flashed), this function must return CANCELLED.
     *
     * @return success True if the merge status is read successfully, false otherwise.
     * @return status Merge status.
     */
    getSnapshotMergeStatus() generates (MergeStatus status);
};