gem5/src/arch/arm/system.cc

/*
 * Copyright (c) 2010, 2012-2013, 2015,2017-2021 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.
 *
 * Copyright (c) 2002-2006 The Regents of The University of Michigan
 * 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,
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * 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.
 */

#include "arch/arm/system.hh"

#include <iostream>

#include "arch/arm/fs_workload.hh"
#include "arch/arm/semihosting.hh"
#include "base/loader/object_file.hh"
#include "base/loader/symtab.hh"
#include "cpu/thread_context.hh"
#include "dev/arm/fvp_base_pwr_ctrl.hh"
#include "dev/arm/gic_v2.hh"
#include "mem/physical.hh"
#include "params/ArmRelease.hh"

namespace gem5
{

using namespace linux;
using namespace ArmISA;

ArmRelease::ArmRelease(const ArmReleaseParams &p)
  : SimObject(p)
{
    for (auto ext : p.extensions) {
        fatal_if(_extensions.find(ext) != _extensions.end(),
            "Duplicated FEAT_\n");

        _extensions[ext] = true;
    }
}

ArmSystem::ArmSystem(const Params &p)
    : System(p),
      _genericTimer(nullptr),
      _gic(nullptr),
      _pwrCtrl(nullptr),
      _highestELIs64(p.highest_el_is_64),
      _physAddrRange64(p.phys_addr_range_64),
      _haveLargeAsid64(p.have_large_asid_64),
      _sveVL(p.sve_vl),
      _smeVL(p.sme_vl),
      semihosting(p.semihosting),
      release(p.release),
      multiProc(p.multi_proc)
{
    if (p.auto_reset_addr) {
        _resetAddr = workload->getEntry();
    } else {
        _resetAddr = p.reset_addr;
        warn_if(workload->getEntry() != _resetAddr,
                "Workload entry point %#x and reset address %#x are different",
                workload->getEntry(), _resetAddr);
    }

    bool wl_is_64 = (workload->getArch() == loader::Arm64);
    if (wl_is_64 != _highestELIs64) {
        warn("Highest ARM exception-level set to AArch%d but the workload "
              "is for AArch%d. Assuming you wanted these to match.",
              _highestELIs64 ? 64 : 32, wl_is_64 ? 64 : 32);
        _highestELIs64 = wl_is_64;
    }

    if (_highestELIs64 && (
            _physAddrRange64 < 32 ||
            _physAddrRange64 > MaxPhysAddrRange ||
            (_physAddrRange64 % 4 != 0 && _physAddrRange64 != 42) ||
            (_physAddrRange64 == 52 && !release->has(ArmExtension::FEAT_LPA))))
    {
        fatal("Invalid physical address range (%d)\n", _physAddrRange64);
    }
}

bool
ArmSystem::has(ArmExtension ext, ThreadContext *tc)
{
    return FullSystem? getArmSystem(tc)->has(ext) : false;
}

bool
ArmSystem::highestELIs64(ThreadContext *tc)
{
    return FullSystem? getArmSystem(tc)->highestELIs64() : true;
}

ExceptionLevel
ArmSystem::highestEL(ThreadContext *tc)
{
    return FullSystem? getArmSystem(tc)->highestEL() : EL1;
}

bool
ArmSystem::haveEL(ThreadContext *tc, ExceptionLevel el)
{
    switch (el) {
      case EL0:
      case EL1:
        return true;
      case EL2:
        return has(ArmExtension::VIRTUALIZATION, tc);
      case EL3:
        return has(ArmExtension::SECURITY, tc);
      default:
        warn("Unimplemented Exception Level\n");
        return false;
    }
}

Addr
ArmSystem::resetAddr(ThreadContext *tc)
{
    return getArmSystem(tc)->resetAddr();
}

uint8_t
ArmSystem::physAddrRange(ThreadContext *tc)
{
    return getArmSystem(tc)->physAddrRange();
}

Addr
ArmSystem::physAddrMask(ThreadContext *tc)
{
    return getArmSystem(tc)->physAddrMask();
}

bool
ArmSystem::haveLargeAsid64(ThreadContext *tc)
{
    return getArmSystem(tc)->haveLargeAsid64();
}

bool
ArmSystem::haveSemihosting(ThreadContext *tc)
{
    return FullSystem && getArmSystem(tc)->haveSemihosting();
}

bool
ArmSystem::callSemihosting64(ThreadContext *tc, bool gem5_ops)
{
    return getArmSystem(tc)->semihosting->call64(tc, gem5_ops);
}

bool
ArmSystem::callSemihosting32(ThreadContext *tc, bool gem5_ops)
{
    return getArmSystem(tc)->semihosting->call32(tc, gem5_ops);
}

bool
ArmSystem::callSemihosting(ThreadContext *tc, bool gem5_ops)
{
    if (ArmISA::inAArch64(tc))
        return callSemihosting64(tc, gem5_ops);
    else
        return callSemihosting32(tc, gem5_ops);
}

void
ArmSystem::callSetStandByWfi(ThreadContext *tc)
{
    if (FVPBasePwrCtrl *pwr_ctrl = getArmSystem(tc)->getPowerController())
        pwr_ctrl->setStandByWfi(tc);
}

void
ArmSystem::callClearStandByWfi(ThreadContext *tc)
{
    if (FVPBasePwrCtrl *pwr_ctrl = getArmSystem(tc)->getPowerController())
        pwr_ctrl->clearStandByWfi(tc);
}

bool
ArmSystem::callSetWakeRequest(ThreadContext *tc)
{
    if (FVPBasePwrCtrl *pwr_ctrl = getArmSystem(tc)->getPowerController())
        return pwr_ctrl->setWakeRequest(tc);
    else
        return true;
}

void
ArmSystem::callClearWakeRequest(ThreadContext *tc)
{
    if (FVPBasePwrCtrl *pwr_ctrl = getArmSystem(tc)->getPowerController())
        pwr_ctrl->clearWakeRequest(tc);
}

} // namespace gem5