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