dev/ide_disk.cc: Make ide disk set interrupts correctly. dev/tsunami_io.cc: dev/tsunami_io.hh: Implement read of timer counts. kern/freebsd/freebsd_system.cc: kern/freebsd/freebsd_system.hh: Remove SkipFuncEvents that we don't need to skip. python/m5/objects/Tsunami.py: Add size parameter to TsunamiFake class. --HG-- extra : convert_revision : a87e74f2cac0036060ca8cb3fde4760d8c91a5db
317 lines
9.3 KiB
C++
317 lines
9.3 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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/** @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 "dev/io_device.hh"
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#include "base/range.hh"
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#include "dev/tsunami.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 PioDevice
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{
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private:
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/** The base address of this device */
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Addr addr;
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/** The size of mappad from the above address */
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static const Addr size = 0xff;
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static struct tm tm;
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/**
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* In Tsunami RTC only has two i/o ports one for data and one for
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* address, so you write the address and then read/write the
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* data. This store the address you are going to be reading from
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* on a read.
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*/
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uint8_t RTCAddress;
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protected:
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/**
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* The ClockEvent is handles the PIT interrupts
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*/
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class ClockEvent : public Event
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{
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protected:
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/** how often the PIT fires */
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Tick interval;
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/** The mode of the PIT */
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uint8_t mode;
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/** The status of the PIT */
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uint8_t status;
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/** The counts (current and latched) of the PIT */
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union {
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uint16_t whole;
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struct {
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uint8_t msb;
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uint8_t lsb;
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} half;
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} current_count, latched_count;
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/** Thse state of the output latch of the PIT */
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bool latch_on;
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bool read_msb;
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public:
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/**
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* Just set the mode to 0
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*/
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ClockEvent();
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/**
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* processs the timer event
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*/
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virtual void process();
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/**
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* Returns a description of this event
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* @return the description
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*/
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virtual const char *description();
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/**
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* Schedule a timer interrupt to occur sometime in the future.
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*/
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void Program(int count);
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/**
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* Write the mode bits of the PIT.
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* @param mode the new mode
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*/
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void ChangeMode(uint8_t mode);
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/**
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* The current PIT status.
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* @return the status of the PIT
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*/
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uint8_t Status();
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/**
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* Latch the count of the PIT.
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*/
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void LatchCount();
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/**
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* The current PIT count.
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* @return the count of the PIT
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*/
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uint8_t Read();
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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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/**
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* Process RTC timer events and generate interrupts appropriately.
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*/
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class RTCEvent : public Event
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{
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protected:
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/** A pointer back to tsunami to create interrupt the processor. */
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Tsunami* tsunami;
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Tick interval;
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public:
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/**
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* RTC Event initializes the RTC event by scheduling an event
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* RTC_RATE times pre second.
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*/
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RTCEvent(Tsunami* t, Tick i);
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/**
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* Interrupth the processor and reschedule the event.
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*/
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virtual void process();
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/**
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* Return a description of this event.
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* @return a description
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*/
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virtual const char *description();
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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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/** uip UpdateInProgess says that the rtc is updating, but we just fake it
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* by alternating it on every read of the bit since we are going to
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* override the loop_per_jiffy time that it is trying to use the UIP to
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* calculate.
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*/
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uint8_t uip;
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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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Tick clockInterval;
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/** A pointer to the Tsunami device which be belong to */
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Tsunami *tsunami;
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/**
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* This timer is initilized, but after I wrote the code
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* it doesn't seem to be used again, and best I can tell
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* it too is not connected to any interrupt port
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*/
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ClockEvent timer0;
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/**
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* This timer is used to control the speaker, which
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* we normally could care less about, however it is
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* also used to calculated the clockspeed and hense
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* bogomips which is kinda important to the scheduler
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* so we need to implemnt it although after boot I can't
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* imagine we would be playing with the PC speaker much
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*/
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ClockEvent timer2;
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/** This is the event used to interrupt the cpu like an RTC. */
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RTCEvent rtc;
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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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uint32_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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/**
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* Initialize all the data for devices supported by Tsunami I/O.
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* @param name name of this device.
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* @param t pointer back to the Tsunami object that we belong to.
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* @param init_time Time (as in seconds since 1970) to set RTC to.
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* @param a address we are mapped at.
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* @param mmu pointer to the memory controller that sends us events.
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*/
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TsunamiIO(const std::string &name, Tsunami *t, time_t init_time,
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Addr a, MemoryController *mmu, HierParams *hier, Bus *bus,
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Tick pio_latency, Tick ci);
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/**
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* Create the tm struct from seconds since 1970
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*/
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void set_time(time_t t);
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/**
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* Process a read to one of the devices we are emulating.
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* @param req Contains the address to read from.
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* @param data A pointer to write the read data to.
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* @return The fault condition of the access.
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*/
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virtual Fault read(MemReqPtr &req, uint8_t *data);
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/**
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* Process a write to one of the devices we emulate.
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* @param req Contains the address to write to.
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* @param data The data to write.
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* @return The fault condition of the access.
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*/
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virtual Fault write(MemReqPtr &req, const uint8_t *data);
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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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Tick cacheAccess(MemReqPtr &req);
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};
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#endif // __DEV_TSUNAMI_IO_HH__
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