page_table.hh revision 2665:a124942bacb8
1/* 2 * Copyright (c) 2003 The Regents of The University of Michigan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Steve Reinhardt 29 */ 30 31/** 32 * @file 33 * Declaration of a non-full system Page Table. 34 */ 35 36#ifndef __PAGE_TABLE__ 37#define __PAGE_TABLE__ 38 39#include <string> 40#include <map> 41 42#include "arch/isa_traits.hh" 43#include "base/trace.hh" 44#include "mem/request.hh" 45#include "mem/packet.hh" 46#include "sim/sim_object.hh" 47 48class System; 49 50/** 51 * Page Table Decleration. 52 */ 53class PageTable 54{ 55 protected: 56 std::map<Addr,Addr> pTable; 57 58 const Addr pageSize; 59 const Addr offsetMask; 60 61 System *system; 62 63 public: 64 65 PageTable(System *_system, Addr _pageSize = TheISA::VMPageSize); 66 67 ~PageTable(); 68 69 Addr pageAlign(Addr a) { return (a & ~offsetMask); } 70 Addr pageOffset(Addr a) { return (a & offsetMask); } 71 72 Fault page_check(Addr addr, int size) const; 73 74 void allocate(Addr vaddr, int size); 75 76 /** 77 * Translate function 78 * @param vaddr The virtual address. 79 * @return Physical address from translation. 80 */ 81 bool translate(Addr vaddr, Addr &paddr); 82 83 /** 84 * Perform a translation on the memory request, fills in paddr 85 * field of mem_req. 86 * @param req The memory request. 87 */ 88 Fault translate(RequestPtr &req); 89 90}; 91 92#endif 93