page_table.cc revision 2423
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 * Definitions of page table. 32 */ 33#include <string> 34#include <map> 35#include <fstream> 36 37#include "arch/faults.hh" 38#include "base/bitfield.hh" 39#include "base/intmath.hh" 40#include "base/trace.hh" 41#include "mem/page_table.hh" 42#include "sim/builder.hh" 43#include "sim/sim_object.hh" 44#include "sim/system.hh" 45 46using namespace std; 47using namespace TheISA; 48 49PageTable::PageTable(System *_system, Addr _pageSize) 50 : pageSize(_pageSize), offsetMask(mask(floorLog2(_pageSize))), 51 system(_system) 52{ 53 assert(isPowerOf2(pageSize)); 54} 55 56PageTable::~PageTable() 57{ 58} 59 60Fault 61PageTable::page_check(Addr addr, int size) const 62{ 63 if (size < sizeof(uint64_t)) { 64 if (!isPowerOf2(size)) { 65 panic("Invalid request size!\n"); 66 return genMachineCheckFault(); 67 } 68 69 if ((size - 1) & addr) 70 return genAlignmentFault(); 71 } 72 else { 73 if ((addr & (VMPageSize - 1)) + size > VMPageSize) { 74 panic("Invalid request size!\n"); 75 return genMachineCheckFault(); 76 } 77 78 if ((sizeof(uint64_t) - 1) & addr) 79 return genAlignmentFault(); 80 } 81 82 return NoFault; 83} 84 85 86 87 88void 89PageTable::allocate(Addr vaddr, int size) 90{ 91 // starting address must be page aligned 92 assert(pageOffset(vaddr) == 0); 93 94 for (; size > 0; size -= pageSize, vaddr += pageSize) { 95 std::map<Addr,Addr>::iterator iter = pTable.find(vaddr); 96 97 if (iter != pTable.end()) { 98 // already mapped 99 fatal("PageTable::allocate: address 0x%x already mapped", vaddr); 100 } 101 102 pTable[vaddr] = system->new_page(); 103 } 104} 105 106 107 108bool 109PageTable::translate(Addr vaddr, Addr &paddr) 110{ 111 Addr page_addr = pageAlign(vaddr); 112 std::map<Addr,Addr>::iterator iter = pTable.find(page_addr); 113 114 if (iter == pTable.end()) { 115 return false; 116 } 117 118 paddr = iter->second + pageOffset(vaddr); 119 return true; 120} 121 122 123Fault 124PageTable::translate(CpuRequestPtr &req) 125{ 126 assert(pageAlign(req->vaddr + req->size - 1) == pageAlign(req->vaddr)); 127 if (!translate(req->vaddr, req->paddr)) { 128 return genMachineCheckFault(); 129 } 130 return page_check(req->paddr, req->size); 131} 132