4cca1d89e8
This patch implements the CLINT device model based on the SiFive U54MC datasheet. CLINT is modelled to receive its clock signal via an interrupt pin. A generic RTC (non-MMIO) is also implemented to provide this signal at arbitrary frequencies. isa.cc is also modified to provide a correct implementation of the rdtime instruction. It will read from the miscreg file (which is updated by CLINT every time mtime is incremented). Change-Id: I6f5393f3a8fdbd059f25df51d3d74bcb28da09f1 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/40597 Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Ayaz Akram <yazakram@ucdavis.edu> Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: Jason Lowe-Power <power.jg@gmail.com>
82 lines
3.0 KiB
C++
82 lines
3.0 KiB
C++
/*
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* Copyright (c) 2021 Huawei International
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* All rights reserved
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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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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#ifndef __DEV_RISCV_RTC_HH__
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#define __DEV_RISCV_RTC_HH__
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#include "dev/intpin.hh"
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#include "dev/mc146818.hh"
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#include "params/RiscvRTC.hh"
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#include "sim/sim_object.hh"
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/**
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* NOTE:
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* This is a generic wrapper around the MC146818 RTC
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*/
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class RiscvRTC : public SimObject
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{
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public:
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class RTC: public MC146818
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{
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public:
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using IntSource = IntSourcePin<RTC>;
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std::vector<std::unique_ptr<IntSource>> intPin;
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RTC(EventManager *em, const std::string &n, const struct tm time,
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bool bcd, Tick frequency, int int_pin_count);
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protected:
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void handleEvent();
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} rtc;
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typedef RiscvRTCParams Params;
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RiscvRTC(const Params ¶ms);
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Port & getPort(const std::string &if_name, PortID idx=InvalidPortID);
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void startup();
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void serialize(CheckpointOut &cp) const override;
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void unserialize(CheckpointIn &cp) override;
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};
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#endif //__DEV_RISCV_RTC_HH__
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