base_gic.hh

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/*
 * Copyright (c) 2012-2013, 2017-2018 ARM Limited
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * 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
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 * 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.
 *
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 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Authors: Andreas Sandberg
 */

#ifndef __DEV_ARM_BASE_GIC_H__
#define __DEV_ARM_BASE_GIC_H__

#include <unordered_map>

#include "arch/arm/system.hh"
#include "dev/io_device.hh"

class Platform;
class RealView;
class ThreadContext;
class ArmInterruptPin;
class ArmSPI;
class ArmPPI;

struct ArmInterruptPinParams;
struct ArmPPIParams;
struct ArmSPIParams;
struct BaseGicParams;

class BaseGic :  public PioDevice
{
  public:
    typedef BaseGicParams Params;
    enum class GicVersion { GIC_V2, GIC_V3, GIC_V4 };

    BaseGic(const Params *p);
    virtual ~BaseGic();
    void init() override;

    const Params * params() const;

    virtual void sendInt(uint32_t num) = 0;

    virtual void sendPPInt(uint32_t num, uint32_t cpu) = 0;
    virtual void clearPPInt(uint32_t num, uint32_t cpu) = 0;

    virtual void clearInt(uint32_t num) = 0;

    ArmSystem *
    getSystem() const
    {
        return (ArmSystem *) sys;
    }

    virtual bool supportsVersion(GicVersion version) = 0;

  protected:
    Platform *platform;
};

class BaseGicRegisters
{
  public:
    virtual uint32_t readDistributor(ContextID ctx, Addr daddr) = 0;
    virtual uint32_t readCpu(ContextID ctx, Addr daddr) = 0;

    virtual void writeDistributor(ContextID ctx, Addr daddr,
                                  uint32_t data) = 0;
    virtual void writeCpu(ContextID ctx, Addr daddr, uint32_t data) = 0;
};

class ArmInterruptPinGen : public SimObject
{
  public:
    ArmInterruptPinGen(const ArmInterruptPinParams *p);

    virtual ArmInterruptPin* get(ThreadContext *tc = nullptr) = 0;
};

class ArmSPIGen : public ArmInterruptPinGen
{
  public:
    ArmSPIGen(const ArmSPIParams *p);

    ArmInterruptPin* get(ThreadContext *tc = nullptr) override;
  protected:
    ArmSPI* pin;
};

class ArmPPIGen : public ArmInterruptPinGen
{
  public:
    ArmPPIGen(const ArmPPIParams *p);

    ArmInterruptPin* get(ThreadContext* tc = nullptr) override;
  protected:
    std::unordered_map<ContextID, ArmPPI*> pins;
};

class ArmInterruptPin
{
    friend class ArmInterruptPinGen;
  protected:
    ArmInterruptPin(Platform *platform, ThreadContext *tc,
                    uint32_t int_num);

  public: /* Public interface */
    void setThreadContext(ThreadContext *tc);

    uint32_t num() const { return intNum; }

    virtual void raise() = 0;
    virtual void clear() = 0;

  protected:
    ContextID targetContext() const;

    const ThreadContext *threadContext;

    RealView *const platform;

    const uint32_t intNum;
};

class ArmSPI : public ArmInterruptPin
{
    friend class ArmSPIGen;
  private:
    ArmSPI(Platform *platform, uint32_t int_num);

  public:
    void raise() override;
    void clear() override;
};

class ArmPPI : public ArmInterruptPin
{
    friend class ArmPPIGen;
  private:
    ArmPPI(Platform *platform, ThreadContext *tc, uint32_t int_num);

  public:
    void raise() override;
    void clear() override;
};

#endif