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81 lines
2.6 KiB
81 lines
2.6 KiB
// Copyright 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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#pragma once
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#include "base/Compiler.h"
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#include "base/StaticMap.h"
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#include "base/export.h"
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#include "vm_operations.h"
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#include <atomic>
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#include <inttypes.h>
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// A global mapping from opaque host memory IDs to host virtual
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// addresses/sizes. This is so that the guest doesn't have to know the host
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// virtual address to be able to map them. However, we do also provide a
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// mechanism for obtaining the offsets into page for such buffers (as the guest
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// does need to know those).
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//
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// This is currently used only in conjunction with virtio-gpu-next and Vulkan /
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// address space device, though there are possible other consumers of this, so
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// it becomes a global object. It exports methods into VmOperations.
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namespace android {
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namespace emulation {
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class HostmemIdMapping {
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public:
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HostmemIdMapping() = default;
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AEMU_EXPORT static HostmemIdMapping* get();
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using Id = uint64_t;
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using Entry = HostmemEntry;
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static const Id kInvalidHostmemId;
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// Returns kInvalidHostmemId if hva or size is 0.
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AEMU_EXPORT Id add(uint64_t hva, uint64_t size, bool register_fixed = false, uint64_t fixed_id = 0);
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// No-op if kInvalidHostmemId or a nonexistent entry
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// is referenced.
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AEMU_EXPORT void remove(Id id);
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// If id == kInvalidHostmemId or not found in map,
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// returns entry with id == kInvalidHostmemId,
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// hva == 0, and size == 0.
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AEMU_EXPORT Entry get(Id id) const;
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// Restores to starting state where there are no entries.
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AEMU_EXPORT void clear();
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private:
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std::atomic<Id> mCurrentId {1};
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base::StaticMap<Id, Entry> mEntries;
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DISALLOW_COPY_ASSIGN_AND_MOVE(HostmemIdMapping);
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};
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} // namespace android
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} // namespace emulation
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// C interface for use with vm operations
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extern "C" {
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AEMU_EXPORT uint64_t android_emulation_hostmem_register(uint64_t hva, uint64_t size, uint32_t register_fixed, uint64_t fixed_id);
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AEMU_EXPORT void android_emulation_hostmem_unregister(uint64_t id);
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AEMU_EXPORT HostmemEntry android_emulation_hostmem_get_info(uint64_t id);
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} // extern "C"
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