i8254.cc revision 11793
17119Sgblack@eecs.umich.edu/* 27119Sgblack@eecs.umich.edu * Copyright (c) 2008 The Regents of The University of Michigan 37119Sgblack@eecs.umich.edu * All rights reserved. 47119Sgblack@eecs.umich.edu * 57119Sgblack@eecs.umich.edu * Redistribution and use in source and binary forms, with or without 67119Sgblack@eecs.umich.edu * modification, are permitted provided that the following conditions are 77119Sgblack@eecs.umich.edu * met: redistributions of source code must retain the above copyright 87119Sgblack@eecs.umich.edu * notice, this list of conditions and the following disclaimer; 97119Sgblack@eecs.umich.edu * redistributions in binary form must reproduce the above copyright 107119Sgblack@eecs.umich.edu * notice, this list of conditions and the following disclaimer in the 117119Sgblack@eecs.umich.edu * documentation and/or other materials provided with the distribution; 127119Sgblack@eecs.umich.edu * neither the name of the copyright holders nor the names of its 137119Sgblack@eecs.umich.edu * contributors may be used to endorse or promote products derived from 147119Sgblack@eecs.umich.edu * this software without specific prior written permission. 157119Sgblack@eecs.umich.edu * 167119Sgblack@eecs.umich.edu * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 177119Sgblack@eecs.umich.edu * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 187119Sgblack@eecs.umich.edu * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 197119Sgblack@eecs.umich.edu * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 207119Sgblack@eecs.umich.edu * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 217119Sgblack@eecs.umich.edu * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 227119Sgblack@eecs.umich.edu * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 237119Sgblack@eecs.umich.edu * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 247119Sgblack@eecs.umich.edu * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 257119Sgblack@eecs.umich.edu * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 267119Sgblack@eecs.umich.edu * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 277119Sgblack@eecs.umich.edu * 287119Sgblack@eecs.umich.edu * Authors: Gabe Black 297119Sgblack@eecs.umich.edu */ 307119Sgblack@eecs.umich.edu 317119Sgblack@eecs.umich.edu#include "dev/x86/i8254.hh" 327119Sgblack@eecs.umich.edu 337119Sgblack@eecs.umich.edu#include "debug/I8254.hh" 347119Sgblack@eecs.umich.edu#include "dev/x86/intdev.hh" 357119Sgblack@eecs.umich.edu#include "mem/packet.hh" 367119Sgblack@eecs.umich.edu#include "mem/packet_access.hh" 377119Sgblack@eecs.umich.edu 387119Sgblack@eecs.umich.eduvoid 397119Sgblack@eecs.umich.eduX86ISA::I8254::counterInterrupt(unsigned int num) 407119Sgblack@eecs.umich.edu{ 417119Sgblack@eecs.umich.edu DPRINTF(I8254, "Interrupt from counter %d.\n", num); 427119Sgblack@eecs.umich.edu if (num == 0) { 437119Sgblack@eecs.umich.edu intPin->raise(); 447119Sgblack@eecs.umich.edu //XXX This is a hack. 457119Sgblack@eecs.umich.edu intPin->lower(); 467119Sgblack@eecs.umich.edu } 477119Sgblack@eecs.umich.edu} 487119Sgblack@eecs.umich.edu 497119Sgblack@eecs.umich.eduTick 507119Sgblack@eecs.umich.eduX86ISA::I8254::read(PacketPtr pkt) 517119Sgblack@eecs.umich.edu{ 527119Sgblack@eecs.umich.edu assert(pkt->getSize() == 1); 537119Sgblack@eecs.umich.edu Addr offset = pkt->getAddr() - pioAddr; 547119Sgblack@eecs.umich.edu if (offset < 3) { 557119Sgblack@eecs.umich.edu pkt->set(pit.readCounter(offset)); 567128Sgblack@eecs.umich.edu } else if (offset == 3) { 577128Sgblack@eecs.umich.edu pkt->set(uint8_t(-1)); 587128Sgblack@eecs.umich.edu } else { 597128Sgblack@eecs.umich.edu panic("Read from undefined i8254 register.\n"); 607128Sgblack@eecs.umich.edu } 617128Sgblack@eecs.umich.edu pkt->makeAtomicResponse(); 627119Sgblack@eecs.umich.edu return latency; 637119Sgblack@eecs.umich.edu} 647119Sgblack@eecs.umich.edu 657119Sgblack@eecs.umich.eduTick 667119Sgblack@eecs.umich.eduX86ISA::I8254::write(PacketPtr pkt) 677119Sgblack@eecs.umich.edu{ 687119Sgblack@eecs.umich.edu assert(pkt->getSize() == 1); 697119Sgblack@eecs.umich.edu Addr offset = pkt->getAddr() - pioAddr; 707119Sgblack@eecs.umich.edu if (offset < 3) { 717119Sgblack@eecs.umich.edu pit.writeCounter(offset, pkt->get<uint8_t>()); 727119Sgblack@eecs.umich.edu } else if (offset == 3) { 737119Sgblack@eecs.umich.edu pit.writeControl(pkt->get<uint8_t>()); 747119Sgblack@eecs.umich.edu } else { 757119Sgblack@eecs.umich.edu panic("Write to undefined i8254 register.\n"); 767119Sgblack@eecs.umich.edu } 777119Sgblack@eecs.umich.edu pkt->makeAtomicResponse(); 787119Sgblack@eecs.umich.edu return latency; 797119Sgblack@eecs.umich.edu} 807119Sgblack@eecs.umich.edu 817119Sgblack@eecs.umich.eduvoid 827119Sgblack@eecs.umich.eduX86ISA::I8254::serialize(CheckpointOut &cp) const 837119Sgblack@eecs.umich.edu{ 847119Sgblack@eecs.umich.edu pit.serialize("pit", cp); 857119Sgblack@eecs.umich.edu} 867119Sgblack@eecs.umich.edu 877119Sgblack@eecs.umich.eduvoid 887119Sgblack@eecs.umich.eduX86ISA::I8254::unserialize(CheckpointIn &cp) 897119Sgblack@eecs.umich.edu{ 907119Sgblack@eecs.umich.edu pit.unserialize("pit", cp); 917119Sgblack@eecs.umich.edu} 927119Sgblack@eecs.umich.edu 937119Sgblack@eecs.umich.eduvoid 947119Sgblack@eecs.umich.eduX86ISA::I8254::startup() 957119Sgblack@eecs.umich.edu{ 967119Sgblack@eecs.umich.edu pit.startup(); 977119Sgblack@eecs.umich.edu} 987119Sgblack@eecs.umich.edu 997119Sgblack@eecs.umich.eduX86ISA::I8254 * 1007119Sgblack@eecs.umich.eduI8254Params::create() 1017119Sgblack@eecs.umich.edu{ 1027119Sgblack@eecs.umich.edu return new X86ISA::I8254(this); 1037119Sgblack@eecs.umich.edu} 1047119Sgblack@eecs.umich.edu