67 lines
1.9 KiB
C++
67 lines
1.9 KiB
C++
//
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// Copyright (C) 2020 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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#pragma once
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#include <cstdint>
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#include <memory>
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#include <set>
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#include <tss2/tss2_esys.h>
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namespace cuttlefish {
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/**
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* Object slot manager for TPM memory. The TPM can only hold a fixed number of
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* objects at once. Some TPM operations are defined to consume slots either
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* temporarily or until the resource is explicitly unloaded.
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*
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* This implementation is intended for future extension, to track what objects
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* are resident if we run out of space, or implement optimizations like LRU
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* caching to avoid re-loading often-used resources.
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*/
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class TpmResourceManager {
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public:
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class ObjectSlot {
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public:
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friend class TpmResourceManager;
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~ObjectSlot();
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ESYS_TR get();
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void set(ESYS_TR resource);
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private:
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ObjectSlot(TpmResourceManager* resource_manager);
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ObjectSlot(TpmResourceManager* resource_manager, ESYS_TR resource);
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TpmResourceManager* resource_manager_;
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ESYS_TR resource_;
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};
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TpmResourceManager(ESYS_CONTEXT* esys);
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~TpmResourceManager();
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ESYS_CONTEXT* Esys();
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std::shared_ptr<ObjectSlot> ReserveSlot();
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private:
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ESYS_CONTEXT* esys_;
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const std::uint32_t maximum_object_slots_;
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std::atomic<std::uint32_t> used_slots_;
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};
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using TpmObjectSlot = std::shared_ptr<TpmResourceManager::ObjectSlot>;
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} // namespace cuttlefish
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