multi_level_page_table.hh

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/*
 * Copyright (c) 2014 Advanced Micro Devices, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Authors: Alexandru Dutu
 */

#ifndef __MEM_MULTI_LEVEL_PAGE_TABLE_HH__
#define __MEM_MULTI_LEVEL_PAGE_TABLE_HH__

#include <string>

#include "arch/tlb.hh"
#include "base/types.hh"
#include "config/the_isa.hh"
#include "mem/page_table.hh"

class System;

template <class ISAOps>
class MultiLevelPageTable : public PageTableBase
{
    ISAOps pTableISAOps;

    System *system;

    Addr basePtr;

    const std::vector<uint8_t> logLevelSize;

    const uint64_t numLevels;

    bool walk(Addr vaddr, bool allocate, Addr &PTE_addr);

public:
    MultiLevelPageTable(const std::string &__name, uint64_t _pid,
                        System *_sys);
    ~MultiLevelPageTable();

    void initState(ThreadContext* tc) override;

    void map(Addr vaddr, Addr paddr, int64_t size,
             uint64_t flags = 0) override;
    void remap(Addr vaddr, int64_t size, Addr new_vaddr) override;
    void unmap(Addr vaddr, int64_t size) override;
    bool isUnmapped(Addr vaddr, int64_t size) override;
    bool lookup(Addr vaddr, TheISA::TlbEntry &entry) override;
    void serialize(CheckpointOut &cp) const override;
    void unserialize(CheckpointIn &cp) override;
};
#endif // __MEM_MULTI_LEVEL_PAGE_TABLE_HH__