page_table.cc revision 12461
12379SN/A/* 210298Salexandru.dutu@amd.com * Copyright (c) 2014 Advanced Micro Devices, Inc. 32379SN/A * Copyright (c) 2003 The Regents of The University of Michigan 42379SN/A * All rights reserved. 52379SN/A * 62379SN/A * Redistribution and use in source and binary forms, with or without 72379SN/A * modification, are permitted provided that the following conditions are 82379SN/A * met: redistributions of source code must retain the above copyright 92379SN/A * notice, this list of conditions and the following disclaimer; 102379SN/A * redistributions in binary form must reproduce the above copyright 112379SN/A * notice, this list of conditions and the following disclaimer in the 122379SN/A * documentation and/or other materials provided with the distribution; 132379SN/A * neither the name of the copyright holders nor the names of its 142379SN/A * contributors may be used to endorse or promote products derived from 152379SN/A * this software without specific prior written permission. 162379SN/A * 172379SN/A * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 182379SN/A * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 192379SN/A * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 202379SN/A * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 212379SN/A * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 222379SN/A * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 232379SN/A * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 242379SN/A * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 252379SN/A * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 262379SN/A * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 272379SN/A * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 282665Ssaidi@eecs.umich.edu * 292665Ssaidi@eecs.umich.edu * Authors: Steve Reinhardt 302665Ssaidi@eecs.umich.edu * Ron Dreslinski 313311Ssaidi@eecs.umich.edu * Ali Saidi 322379SN/A */ 332379SN/A 342379SN/A/** 352379SN/A * @file 3610298Salexandru.dutu@amd.com * Definitions of functional page table. 372379SN/A */ 3811793Sbrandon.potter@amd.com#include "mem/page_table.hh" 3911793Sbrandon.potter@amd.com 402379SN/A#include <string> 412379SN/A 422379SN/A#include "base/trace.hh" 438232Snate@binkert.org#include "debug/MMU.hh" 447678Sgblack@eecs.umich.edu#include "sim/faults.hh" 4511800Sbrandon.potter@amd.com#include "sim/serialize.hh" 462379SN/A 472399SN/Ausing namespace std; 482379SN/A 492399SN/Avoid 5012448Sgabeblack@google.comEmulationPageTable::map(Addr vaddr, Addr paddr, int64_t size, uint64_t flags) 512399SN/A{ 5210558Salexandru.dutu@amd.com bool clobber = flags & Clobber; 532399SN/A // starting address must be page aligned 542399SN/A assert(pageOffset(vaddr) == 0); 552399SN/A 5612448Sgabeblack@google.com DPRINTF(MMU, "Allocating Page: %#x-%#x\n", vaddr, vaddr + size); 573311Ssaidi@eecs.umich.edu 5812448Sgabeblack@google.com while (size > 0) { 5912442Sgabeblack@google.com auto it = pTable.find(vaddr); 6012442Sgabeblack@google.com if (it != pTable.end()) { 6112461Sgabeblack@google.com // already mapped 6212461Sgabeblack@google.com panic_if(!clobber, 6312461Sgabeblack@google.com "EmulationPageTable::allocate: addr %#x already mapped", 6412461Sgabeblack@google.com vaddr); 6512461Sgabeblack@google.com it->second = Entry(paddr, flags); 6612442Sgabeblack@google.com } else { 6712461Sgabeblack@google.com pTable.emplace(vaddr, Entry(paddr, flags)); 682399SN/A } 692399SN/A 7012448Sgabeblack@google.com size -= pageSize; 7112448Sgabeblack@google.com vaddr += pageSize; 7212448Sgabeblack@google.com paddr += pageSize; 732399SN/A } 742399SN/A} 752399SN/A 765877Shsul@eecs.umich.eduvoid 7712448Sgabeblack@google.comEmulationPageTable::remap(Addr vaddr, int64_t size, Addr new_vaddr) 785877Shsul@eecs.umich.edu{ 795877Shsul@eecs.umich.edu assert(pageOffset(vaddr) == 0); 805877Shsul@eecs.umich.edu assert(pageOffset(new_vaddr) == 0); 815877Shsul@eecs.umich.edu 825877Shsul@eecs.umich.edu DPRINTF(MMU, "moving pages from vaddr %08p to %08p, size = %d\n", vaddr, 835877Shsul@eecs.umich.edu new_vaddr, size); 845877Shsul@eecs.umich.edu 8512448Sgabeblack@google.com while (size > 0) { 8612442Sgabeblack@google.com auto new_it = pTable.find(new_vaddr); 8712442Sgabeblack@google.com auto old_it = pTable.find(vaddr); 8812442Sgabeblack@google.com assert(old_it != pTable.end() && new_it == pTable.end()); 895877Shsul@eecs.umich.edu 9012442Sgabeblack@google.com new_it->second = old_it->second; 9112442Sgabeblack@google.com pTable.erase(old_it); 9212448Sgabeblack@google.com size -= pageSize; 9312448Sgabeblack@google.com vaddr += pageSize; 9412448Sgabeblack@google.com new_vaddr += pageSize; 955877Shsul@eecs.umich.edu } 965877Shsul@eecs.umich.edu} 975877Shsul@eecs.umich.edu 985877Shsul@eecs.umich.eduvoid 9912448Sgabeblack@google.comEmulationPageTable::getMappings(std::vector<std::pair<Addr, Addr>> *addr_maps) 10011886Sbrandon.potter@amd.com{ 10111886Sbrandon.potter@amd.com for (auto &iter : pTable) 10212461Sgabeblack@google.com addr_maps->push_back(make_pair(iter.first, iter.second.paddr)); 10311886Sbrandon.potter@amd.com} 10411886Sbrandon.potter@amd.com 10511886Sbrandon.potter@amd.comvoid 10612448Sgabeblack@google.comEmulationPageTable::unmap(Addr vaddr, int64_t size) 1075877Shsul@eecs.umich.edu{ 1085877Shsul@eecs.umich.edu assert(pageOffset(vaddr) == 0); 1095877Shsul@eecs.umich.edu 11012461Sgabeblack@google.com DPRINTF(MMU, "Unmapping page: %#x-%#x\n", vaddr, vaddr + size); 1115877Shsul@eecs.umich.edu 11212448Sgabeblack@google.com while (size > 0) { 11312442Sgabeblack@google.com auto it = pTable.find(vaddr); 11412442Sgabeblack@google.com assert(it != pTable.end()); 11512442Sgabeblack@google.com pTable.erase(it); 11612448Sgabeblack@google.com size -= pageSize; 11712448Sgabeblack@google.com vaddr += pageSize; 1185877Shsul@eecs.umich.edu } 1195877Shsul@eecs.umich.edu} 1205877Shsul@eecs.umich.edu 1212399SN/Abool 12212448Sgabeblack@google.comEmulationPageTable::isUnmapped(Addr vaddr, int64_t size) 1238600Ssteve.reinhardt@amd.com{ 1248600Ssteve.reinhardt@amd.com // starting address must be page aligned 1258600Ssteve.reinhardt@amd.com assert(pageOffset(vaddr) == 0); 1268600Ssteve.reinhardt@amd.com 12712448Sgabeblack@google.com for (int64_t offset = 0; offset < size; offset += pageSize) 12812448Sgabeblack@google.com if (pTable.find(vaddr + offset) != pTable.end()) 1298600Ssteve.reinhardt@amd.com return false; 1308600Ssteve.reinhardt@amd.com 1318600Ssteve.reinhardt@amd.com return true; 1328600Ssteve.reinhardt@amd.com} 1338600Ssteve.reinhardt@amd.com 13412461Sgabeblack@google.comconst EmulationPageTable::Entry * 13512455Sgabeblack@google.comEmulationPageTable::lookup(Addr vaddr) 1362399SN/A{ 1372399SN/A Addr page_addr = pageAlign(vaddr); 1385004Sgblack@eecs.umich.edu PTableItr iter = pTable.find(page_addr); 13912448Sgabeblack@google.com if (iter == pTable.end()) 14012455Sgabeblack@google.com return nullptr; 14112461Sgabeblack@google.com return &(iter->second); 1422399SN/A} 1432399SN/A 1445004Sgblack@eecs.umich.edubool 14512448Sgabeblack@google.comEmulationPageTable::translate(Addr vaddr, Addr &paddr) 1465004Sgblack@eecs.umich.edu{ 14712461Sgabeblack@google.com const Entry *entry = lookup(vaddr); 14812455Sgabeblack@google.com if (!entry) { 1495183Ssaidi@eecs.umich.edu DPRINTF(MMU, "Couldn't Translate: %#x\n", vaddr); 1505004Sgblack@eecs.umich.edu return false; 1515183Ssaidi@eecs.umich.edu } 15212461Sgabeblack@google.com paddr = pageOffset(vaddr) + entry->paddr; 1535183Ssaidi@eecs.umich.edu DPRINTF(MMU, "Translating: %#x->%#x\n", vaddr, paddr); 1545004Sgblack@eecs.umich.edu return true; 1555004Sgblack@eecs.umich.edu} 1562399SN/A 1572394SN/AFault 15812448Sgabeblack@google.comEmulationPageTable::translate(RequestPtr req) 1592394SN/A{ 1602532SN/A Addr paddr; 16112448Sgabeblack@google.com assert(pageAlign(req->getVaddr() + req->getSize() - 1) == 16212448Sgabeblack@google.com pageAlign(req->getVaddr())); 16312448Sgabeblack@google.com if (!translate(req->getVaddr(), paddr)) 1645004Sgblack@eecs.umich.edu return Fault(new GenericPageTableFault(req->getVaddr())); 1652532SN/A req->setPaddr(paddr); 1665004Sgblack@eecs.umich.edu if ((paddr & (pageSize - 1)) + req->getSize() > pageSize) { 1675004Sgblack@eecs.umich.edu panic("Request spans page boundaries!\n"); 1685004Sgblack@eecs.umich.edu return NoFault; 1695004Sgblack@eecs.umich.edu } 1705004Sgblack@eecs.umich.edu return NoFault; 1712394SN/A} 1723311Ssaidi@eecs.umich.edu 1733311Ssaidi@eecs.umich.eduvoid 17412448Sgabeblack@google.comEmulationPageTable::serialize(CheckpointOut &cp) const 1753311Ssaidi@eecs.umich.edu{ 17610905Sandreas.sandberg@arm.com paramOut(cp, "ptable.size", pTable.size()); 1773320Shsul@eecs.umich.edu 1786227Snate@binkert.org PTable::size_type count = 0; 17910905Sandreas.sandberg@arm.com for (auto &pte : pTable) { 18010905Sandreas.sandberg@arm.com ScopedCheckpointSection sec(cp, csprintf("Entry%d", count++)); 1813311Ssaidi@eecs.umich.edu 18210905Sandreas.sandberg@arm.com paramOut(cp, "vaddr", pte.first); 18312461Sgabeblack@google.com paramOut(cp, "paddr", pte.second.paddr); 18412461Sgabeblack@google.com paramOut(cp, "flags", pte.second.flags); 1853311Ssaidi@eecs.umich.edu } 1863311Ssaidi@eecs.umich.edu assert(count == pTable.size()); 1873311Ssaidi@eecs.umich.edu} 1883311Ssaidi@eecs.umich.edu 1893311Ssaidi@eecs.umich.eduvoid 19012448Sgabeblack@google.comEmulationPageTable::unserialize(CheckpointIn &cp) 1913311Ssaidi@eecs.umich.edu{ 19210905Sandreas.sandberg@arm.com int count; 19310905Sandreas.sandberg@arm.com paramIn(cp, "ptable.size", count); 1943311Ssaidi@eecs.umich.edu 19510905Sandreas.sandberg@arm.com for (int i = 0; i < count; ++i) { 19610905Sandreas.sandberg@arm.com ScopedCheckpointSection sec(cp, csprintf("Entry%d", i)); 1973311Ssaidi@eecs.umich.edu 19812461Sgabeblack@google.com Addr vaddr; 19912461Sgabeblack@google.com UNSERIALIZE_SCALAR(vaddr); 20012461Sgabeblack@google.com Addr paddr; 20112461Sgabeblack@google.com uint64_t flags; 20212461Sgabeblack@google.com UNSERIALIZE_SCALAR(paddr); 20312461Sgabeblack@google.com UNSERIALIZE_SCALAR(flags); 20410905Sandreas.sandberg@arm.com 20512461Sgabeblack@google.com pTable.emplace(vaddr, Entry(paddr, flags)); 2066818SLisa.Hsu@amd.com } 2073311Ssaidi@eecs.umich.edu} 2083311Ssaidi@eecs.umich.edu 209