page_table.hh revision 2379
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 29/** 30 * @file 31 * Declaration of a non-full system Page Table. 32 */ 33 34#ifndef __PAGE_TABLE__ 35#define __PAGE_TABLE__ 36 37#include <string> 38#include <map> 39 40#include "base/trace.hh" 41#include "mem/mem_req.hh" 42#include "mem/mem_cmd.hh" 43#include "sim/sim_object.hh" 44 45class System; 46 47/** 48 * Page Table Decleration. 49 */ 50class PageTable 51{ 52 protected: 53 std::map<Addr,Addr> pTable; 54 55 const Addr pageSize; 56 const Addr offsetMask; 57 58 System *system; 59 60 public: 61 62 PageTable(System *_system, Addr _pageSize = VMPageSize); 63 64 ~PageTable(); 65 66 Addr pageAlign(Addr a) { return (a & ~offsetMask); } 67 Addr pageOffset(Addr a) { return (a & offsetMask); } 68 69 Fault page_check(Addr addr, int size) const; 70 71 void allocate(Addr vaddr, int size); 72 73 /** 74 * Translate function 75 * @param vaddr The virtual address. 76 * @return Physical address from translation. 77 */ 78 bool translate(Addr vaddr, Addr &paddr); 79 80 /** 81 * Perform a translation on the memory request, fills in paddr field of mem_req. 82 * @param req The memory request. 83 */ 84 Fault translate(MemReqPtr &req); 85 86}; 87 88#endif 89