| /* |
| * 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, |
| LUPIO_TMR_LOAD, |
| LUPIO_TMR_CTRL, |
| LUPIO_TMR_STAT, |
| |
| // Max offset |
| LUPIO_TMR_MAX, |
| }; |
| |
| 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 ¶ms); |
| ~LupioTMR(); |
| |
| /** |
| * Implement BasicPioDevice virtual functions |
| */ |
| Tick read(PacketPtr pkt) override; |
| Tick write(PacketPtr pkt) override; |
| }; |
| |
| } // namespace gem5 |
| |
| #endif // __DEV_LUPIO_LUPIO_TMR_HH_ |