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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_PIC_HH__
#define __DEV_LUPIO_LUPIO_PIC_HH__
#include "arch/riscv/interrupts.hh"
#include "dev/io_device.hh"
#include "dev/platform.hh"
#include "params/LupioPIC.hh"
#include "sim/system.hh"
#define LUPIO_PIC_NSRC 32
namespace gem5
{
/**
* LupioPIC:
* A programmable interrupt controller virtual device that can
* manage input IRQs coming from up to 32 sources
*/
class LupioPIC : public BasicPioDevice
{
protected:
System *system;
int nSrc;
int nThread;
// Type of interrupt
int intType;
const ByteOrder byteOrder = ByteOrder::little;
// Register map
private:
enum
{
LUPIO_PIC_PRIO = 0x0,
LUPIO_PIC_MASK = 0x4,
LUPIO_PIC_PEND = 0x8,
LUPIO_PIC_ENAB = 0xC,
// Max offset
LUPIO_PIC_MAX = 0x10,
};
uint32_t pending = 0;
// Register for masking or unmasking up to 32 sources
uint32_t mask[LUPIO_PIC_NSRC];
// Regitser to determine which input IRQ is routed to the
// corresponding processor
uint32_t enable[LUPIO_PIC_NSRC];
protected:
/**
* Function to return information about interrupt requests to the LupIO-PIC
*/
uint64_t lupioPicRead(const uint8_t addr);
/**
* Function to update interrupt requests
*/
void lupioPicWrite(const uint8_t addr, uint64_t val64);
/**
* Function to post and clear interrupts
**/
void lupioPicUpdateIRQ();
public:
PARAMS(LupioPIC);
LupioPIC(const Params &params);
void post(int src_id);
void clear(int src_id);
/**
* Implement BasicPioDevice virtual functions
*/
Tick read(PacketPtr pkt) override;
Tick write(PacketPtr pkt) override;
};
} // namespace gem5
#endif // __DEV_LUPIO_LUPIO_PIC_HH_