vma.hh

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/*
 * Copyright (c) 2017-2020 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
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 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 */
 
#ifndef __SRC_MEM_VMA_HH__
#define __SRC_MEM_VMA_HH__
 
#include <string>
 
#include "base/addr_range.hh"
#include "base/trace.hh"
#include "base/types.hh"
#include "debug/Vma.hh"
#include "mem/se_translating_port_proxy.hh"
 
namespace gem5
{
 
class VMA
{
  class MappedFileBuffer;
 
  public:
    VMA(AddrRange r, Addr page_bytes, const std::string& vma_name="anon",
        int fd=-1, off_t off=0)
        : _addrRange(r), _pageBytes(page_bytes), _vmaName(vma_name)
    {
        DPRINTF(Vma, "Creating vma start %#x len %llu end %#x\n",
                r.start(), r.size(), r.end());
 
        if (fd != -1) {
            _origHostBuf =
                std::make_shared<MappedFileBuffer>(fd, r.size(), off);
            _hostBuf = _origHostBuf->getBuffer();
            _hostBufLen = _origHostBuf->getLength();
        }
 
        sanityCheck();
    }
 
    void
    remap(Addr new_start)
    {
        _addrRange = AddrRange(new_start, new_start + _addrRange.size());
 
        DPRINTF(Vma, "Remapping vma start %#x end %#x\n", _addrRange.start(),
                _addrRange.end());
 
        sanityCheck();
    }
 
    bool hasHostBuf() const { return _origHostBuf != nullptr; }
 
    void fillMemPages(Addr start, Addr size, PortProxy &port) const;
 
    bool isStrictSuperset(const AddrRange &range) const;
 
    void sliceRegionRight(Addr slice_addr);
 
    void sliceRegionLeft(Addr slice_addr);
 
    const std::string& getName() { return _vmaName; }
    off_t getFileMappingOffset() const
    {
        return hasHostBuf() ? _origHostBuf->getOffset() : 0;
    }
 
    Addr size() { return _addrRange.size(); }
    Addr start() { return _addrRange.start(); }
    Addr end() { return _addrRange.end(); }
 
    bool
    mergesWith(const AddrRange& r) const
    {
        return _addrRange.mergesWith(r);
    }
 
    bool
    intersects(const AddrRange& r) const
    {
        return _addrRange.intersects(r);
    }
 
    bool
    isSubset(const AddrRange& r) const
    {
        return _addrRange.isSubset(r);
    }
 
    bool
    contains(const Addr& a) const
    {
        return _addrRange.contains(a);
    }
 
  private:
    void sanityCheck();
 
    AddrRange _addrRange;
 
    Addr _pageBytes;
 
    std::shared_ptr<MappedFileBuffer> _origHostBuf;
 
    void *_hostBuf;
 
    uint64_t _hostBufLen;
 
    std::string _vmaName;
 
    class MappedFileBuffer
    {
      public:
        MappedFileBuffer(int fd, size_t length, off_t offset);
        ~MappedFileBuffer();
 
        void *getBuffer() const { return _buffer; }
        uint64_t getLength() const { return _length; }
        off_t getOffset() const { return _offset; }
 
      private:
        void *_buffer;       // Host buffer ptr
        size_t _length;       // Length of host ptr
        off_t _offset;       // Offset in file at which mapping starts
    };
};
 
} // namespace gem5
 
#endif // __SRC_MEM_VMA_HH__