3f9f4bf3d6
It's not the right fix for the checkpoint deadlock problem Brad was having, and creates another bug where the system can deadlock on restore. Brad can't reproduce the original bug right now, so we'll wait until it arises again and then try to fix it the right way then.
158 lines
4.4 KiB
C++
158 lines
4.4 KiB
C++
/*
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* Copyright (c) 2004-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Ali Saidi
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* Andrew Schultz
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* Miguel Serrano
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*/
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/** @file
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* Tsunami I/O Space mapping including RTC/timer interrupts
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*/
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#ifndef __DEV_TSUNAMI_IO_HH__
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#define __DEV_TSUNAMI_IO_HH__
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#include "base/range.hh"
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#include "dev/alpha/tsunami.hh"
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#include "dev/intel_8254_timer.hh"
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#include "dev/mc146818.hh"
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#include "dev/io_device.hh"
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#include "params/TsunamiIO.hh"
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#include "sim/eventq.hh"
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/**
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* Tsunami I/O device is a catch all for all the south bridge stuff we care
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* to implement.
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*/
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class TsunamiIO : public BasicPioDevice
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{
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private:
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struct tm tm;
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protected:
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class RTC : public MC146818
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{
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public:
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Tsunami *tsunami;
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RTC(const std::string &n, const TsunamiIOParams *p);
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protected:
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void handleEvent()
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{
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//Actually interrupt the processor here
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tsunami->cchip->postRTC();
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}
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};
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/** Mask of the PIC1 */
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uint8_t mask1;
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/** Mask of the PIC2 */
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uint8_t mask2;
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/** Mode of PIC1. Not used for anything */
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uint8_t mode1;
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/** Mode of PIC2. Not used for anything */
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uint8_t mode2;
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/** Raw PIC interrupt register before masking */
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uint8_t picr; //Raw PIC interrput register
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/** Is the pic interrupting right now or not. */
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bool picInterrupting;
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/** A pointer to the Tsunami device which be belong to */
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Tsunami *tsunami;
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/** Intel 8253 Periodic Interval Timer */
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Intel8254Timer pitimer;
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RTC rtc;
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uint8_t rtcAddr;
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/** The interval is set via two writes to the PIT.
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* This variable contains a flag as to how many writes have happened, and
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* the time so far.
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*/
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uint16_t timerData;
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public:
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/**
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* Return the freqency of the RTC
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* @return interrupt rate of the RTC
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*/
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Tick frequency() const;
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public:
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typedef TsunamiIOParams Params;
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/**
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* Initialize all the data for devices supported by Tsunami I/O.
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* @param p pointer to Params struct
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*/
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TsunamiIO(const Params *p);
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const Params *
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params() const
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{
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return dynamic_cast<const Params *>(_params);
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}
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virtual Tick read(PacketPtr pkt);
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virtual Tick write(PacketPtr pkt);
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/**
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* Post an PIC interrupt to the CPU via the CChip
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* @param bitvector interrupt to post.
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*/
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void postPIC(uint8_t bitvector);
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/**
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* Clear a posted interrupt
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* @param bitvector interrupt to clear
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*/
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void clearPIC(uint8_t bitvector);
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/**
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* Serialize this object to the given output stream.
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* @param os The stream to serialize to.
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*/
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virtual void serialize(std::ostream &os);
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/**
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* Reconstruct the state of this object from a checkpoint.
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* @param cp The checkpoint use.
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* @param section The section name of this object
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*/
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virtual void unserialize(Checkpoint *cp, const std::string §ion);
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};
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#endif // __DEV_TSUNAMI_IO_HH__
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