cf8427af89
Move merge_status from bootloader_control_ab, which is in vendor space, to a new generic AOSP struct in system space. This will allow more devices to share the same HAL implementation. This patch also changes libboot_control to compensate for merge_status moving out of vendor space. The reference HAL library now also provides separate helper functions for managing the merge status, so devices using a custom boot control HAL can still take advantage of the new misc implementation. Bug: 139156011 Test: manual test Change-Id: I5cd824e25f9d07aad1476301def5cdc3f506b029
90 lines
3.1 KiB
C++
90 lines
3.1 KiB
C++
//
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// Copyright (C) 2019 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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#pragma once
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#include <string>
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#include <android/hardware/boot/1.1/IBootControl.h>
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namespace android {
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namespace bootable {
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// Helper library to implement the IBootControl HAL using the misc partition.
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class BootControl {
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using MergeStatus = ::android::hardware::boot::V1_1::MergeStatus;
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public:
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bool Init();
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unsigned int GetNumberSlots();
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unsigned int GetCurrentSlot();
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bool MarkBootSuccessful();
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bool SetActiveBootSlot(unsigned int slot);
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bool SetSlotAsUnbootable(unsigned int slot);
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bool SetSlotBootable(unsigned int slot);
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bool IsSlotBootable(unsigned int slot);
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const char* GetSuffix(unsigned int slot);
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bool IsSlotMarkedSuccessful(unsigned int slot);
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bool SetSnapshotMergeStatus(MergeStatus status);
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MergeStatus GetSnapshotMergeStatus();
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bool IsValidSlot(unsigned int slot);
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const std::string& misc_device() const {
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return misc_device_;
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}
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private:
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// Whether this object was initialized with data from the bootloader message
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// that doesn't change until next reboot.
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bool initialized_ = false;
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// The path to the misc_device as reported in the fstab.
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std::string misc_device_;
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// The number of slots present on the device.
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unsigned int num_slots_ = 0;
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// The slot where we are running from.
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unsigned int current_slot_ = 0;
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};
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// Helper functions to write the Virtual A/B merge status message. These are
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// separate because BootControl uses bootloader_control_ab in vendor space,
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// whereas the Virtual A/B merge status is in system space. A HAL might not
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// use bootloader_control_ab, but may want to use the AOSP method of maintaining
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// the merge status.
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// If the Virtual A/B message has not yet been initialized, then initialize it.
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// This should be called when the BootControl HAL first loads.
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//
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// If the Virtual A/B message in misc was already initialized, true is returned.
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// If initialization was attempted, but failed, false is returned, and the HAL
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// should fail to load.
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bool InitMiscVirtualAbMessageIfNeeded();
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// Save the current merge status as well as the current slot.
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bool SetMiscVirtualAbMergeStatus(unsigned int current_slot,
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android::hardware::boot::V1_1::MergeStatus status);
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// Return the current merge status. If the saved status is SNAPSHOTTED but the
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// slot hasn't changed, the status returned will be NONE.
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bool GetMiscVirtualAbMergeStatus(unsigned int current_slot,
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android::hardware::boot::V1_1::MergeStatus* status);
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} // namespace bootable
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} // namespace android
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