PageDirectory.hh

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/*
 * Copyright 2021 Assured Information Security, Inc.
 *
 * 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.
 */
#pragma once
 
#ifdef __x86_64__
 
#include <introvirt/core/fwd.hh>
#include <introvirt/util/compiler.hh>
 
#include <cstdint>
#include <memory>
#include <mutex>
#include <unordered_map>
 
namespace introvirt {
namespace x86 {
 
class PageDirectory final {
  public:
    static constexpr uint64_t PAGE_SHIFT = 12;
 
    static constexpr uint64_t PAGE_SIZE = (1ull << PAGE_SHIFT);
 
    static constexpr uint64_t PAGE_MASK = (~(PAGE_SIZE - 1));
 
    uint64_t translate(uint64_t virtual_address, uint64_t page_directory) const HOT;
 
    void reconfigure(const Vcpu& vcpu);
 
    PageDirectory(Domain& domain);
 
    ~PageDirectory();
 
  private:
    Domain& domain_;
 
    int pt_levels_ = 0;
    int pte_size_ = 0;
    uint64_t va_mask_ = 0;
    uint64_t mask_ = 0;
};
 
} // namespace x86
 
using PageDirectory = x86::PageDirectory;
 
} // namespace introvirt
 
#endif