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/*
* Copyright (c) 2021 The Regents of the University of California
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __DEV_LUPIO_LUPIO_TMR_HH__
#define __DEV_LUPIO_LUPIO_TMR_HH__
#include "arch/riscv/interrupts.hh"
#include "dev/io_device.hh"
#include "dev/platform.hh"
#include "params/LupioTMR.hh"
namespace gem5
{
/**
* LupioTMR:
* A virtual timer device which provides a real time counter, as well as a
* configurable timer offering periodic and one shot modes.
*/
class LupioTMR : public BasicPioDevice
{
private:
const ByteOrder byteOrder = ByteOrder::little;
System *system;
int nThread;
int intType;
// Register map
enum
{
LUPIO_TMR_TIME = 0x0,
LUPIO_TMR_LOAD = 0x4,
LUPIO_TMR_CTRL = 0x8,
LUPIO_TMR_STAT = 0xC,
// Max offset
LUPIO_TMR_MAX = 0x10,
};
struct LupioTimer
{
Event *tmrEvent = nullptr;
uint64_t reload = 0;
bool ie = false; // Control
bool pd = false;
bool expired = false; // Status
Tick startTime = 0;
};
std::vector<LupioTimer> timers;
/**
* Function to return data pertaining to the timer, such as the simulated
* time in ticks
*/
uint64_t lupioTMRRead(const uint8_t addr, int size);
/**
* Function to launch or stop the timer depending on the load value
*/
void lupioTMRWrite(const uint8_t addr, uint64_t val64, int size);
/**
* Return the simulated time
*/
uint64_t lupioTMRCurrentTime();
/**
* Schedule the next timer event
*/
void lupioTMRSet(int cpu);
/**
* Process the timer's event
*/
void lupioTMRCallback(int cpu);
/**
* Post or clear timer interrupts
*/
void updateIRQ(int level, int cpu);
public:
PARAMS(LupioTMR);
LupioTMR(const Params &params);
~LupioTMR();
/**
* Implement BasicPioDevice virtual functions
*/
Tick read(PacketPtr pkt) override;
Tick write(PacketPtr pkt) override;
};
} // namespace gem5
#endif // __DEV_LUPIO_LUPIO_TMR_HH_