6f9d294e86
PageTable supported an allocate() call that called back through the Process to allocate memory, but did not have a method to map addresses without allocating new pages. It makes more sense for Process to do the allocation, so this method was renamed allocateMem() and moved to Process, and uses a new map() call on PageTable. The remaining uses of the process pointer in PageTable were only to get the name and the PID, so by passing these in directly in the constructor, we can make PageTable completely independent of Process.
148 lines
4.6 KiB
C++
148 lines
4.6 KiB
C++
/*
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* Copyright (c) 2003 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Steve Reinhardt
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*/
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/**
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* @file
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* Declaration of a non-full system Page Table.
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*/
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#ifndef __MEM_PAGE_TABLE_HH__
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#define __MEM_PAGE_TABLE_HH__
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#include <string>
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#include "arch/isa_traits.hh"
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#include "arch/tlb.hh"
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#include "base/hashmap.hh"
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#include "base/types.hh"
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#include "config/the_isa.hh"
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#include "mem/request.hh"
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#include "sim/serialize.hh"
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/**
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* Page Table Declaration.
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*/
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class PageTable
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{
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protected:
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typedef m5::hash_map<Addr, TheISA::TlbEntry> PTable;
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typedef PTable::iterator PTableItr;
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PTable pTable;
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struct cacheElement {
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Addr vaddr;
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TheISA::TlbEntry entry;
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};
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struct cacheElement pTableCache[3];
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const Addr pageSize;
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const Addr offsetMask;
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const uint64_t pid;
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const std::string _name;
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public:
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PageTable(const std::string &__name, uint64_t _pid,
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Addr _pageSize = TheISA::VMPageSize);
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~PageTable();
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// for DPRINTF compatibility
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const std::string name() const { return _name; }
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Addr pageAlign(Addr a) { return (a & ~offsetMask); }
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Addr pageOffset(Addr a) { return (a & offsetMask); }
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void map(Addr vaddr, Addr paddr, int64_t size, bool clobber = false);
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void remap(Addr vaddr, int64_t size, Addr new_vaddr);
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void unmap(Addr vaddr, int64_t size);
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/**
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* Check if any pages in a region are already allocated
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* @param vaddr The starting virtual address of the region.
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* @param size The length of the region.
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* @return True if no pages in the region are mapped.
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*/
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bool isUnmapped(Addr vaddr, int64_t size);
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/**
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* Lookup function
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* @param vaddr The virtual address.
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* @return entry The page table entry corresponding to vaddr.
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*/
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bool lookup(Addr vaddr, TheISA::TlbEntry &entry);
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/**
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* Translate function
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* @param vaddr The virtual address.
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* @param paddr Physical address from translation.
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* @return True if translation exists
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*/
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bool translate(Addr vaddr, Addr &paddr);
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/**
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* Simplified translate function (just check for translation)
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* @param vaddr The virtual address.
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* @return True if translation exists
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*/
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bool translate(Addr vaddr) { Addr dummy; return translate(vaddr, dummy); }
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/**
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* Perform a translation on the memory request, fills in paddr
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* field of req.
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* @param req The memory request.
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*/
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Fault translate(RequestPtr req);
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/**
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* Update the page table cache.
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* @param vaddr virtual address (page aligned) to check
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* @param pte page table entry to return
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*/
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inline void updateCache(Addr vaddr, TheISA::TlbEntry entry)
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{
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pTableCache[2].entry = pTableCache[1].entry;
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pTableCache[2].vaddr = pTableCache[1].vaddr;
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pTableCache[1].entry = pTableCache[0].entry;
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pTableCache[1].vaddr = pTableCache[0].vaddr;
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pTableCache[0].entry = entry;
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pTableCache[0].vaddr = vaddr;
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}
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void serialize(std::ostream &os);
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void unserialize(Checkpoint *cp, const std::string §ion);
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};
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#endif // __MEM_PAGE_TABLE_HH__
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