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CsRegs.cpp
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CsRegs.cpp
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// Copyright 2020 Western Digital Corporation or its affiliates.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <iostream>
#include <algorithm>
#include <cassert>
#include <cfenv>
#include <array>
#include "CsRegs.hpp"
#include "FpRegs.hpp"
#include "VecRegs.hpp"
using namespace WdRiscv;
template <typename URV>
CsRegs<URV>::CsRegs()
: regs_(size_t(CsrNumber::MAX_CSR_) + 1)
{
// Define CSR entries.
defineMachineRegs();
defineSupervisorRegs();
defineUserRegs();
defineDebugRegs();
defineVectorRegs();
defineNonStandardRegs();
}
template <typename URV>
CsRegs<URV>::~CsRegs()
{
regs_.clear();
nameToNumber_.clear();
}
template <typename URV>
Csr<URV>*
CsRegs<URV>::defineCsr(const std::string& name, CsrNumber csrn, bool mandatory,
bool implemented, URV resetValue, URV writeMask,
URV pokeMask, bool isDebug, bool quiet)
{
size_t ix = size_t(csrn);
if (ix >= regs_.size())
return nullptr;
if (nameToNumber_.count(name))
{
if (not quiet)
std::cerr << "Error: CSR " << name << " already defined\n";
return nullptr;
}
auto& csr = regs_.at(ix);
if (csr.isDefined())
{
if (not quiet)
std::cerr << "Error: CSR 0x" << std::hex << size_t(csrn) << std::dec
<< " is already defined as " << csr.getName() << '\n';
return nullptr;
}
PrivilegeMode priv = PrivilegeMode((ix & 0x300) >> 8);
csr.definePrivilegeMode(priv);
csr.setDefined(true);
csr.config(name, csrn, mandatory, implemented, resetValue, writeMask,
pokeMask, isDebug);
nameToNumber_[name] = csrn;
return &csr;
}
template <typename URV>
Csr<URV>*
CsRegs<URV>::findCsr(const std::string& name)
{
const auto iter = nameToNumber_.find(name);
if (iter == nameToNumber_.end())
return nullptr;
size_t num = size_t(iter->second);
if (num >= regs_.size())
return nullptr;
return ®s_.at(num);
}
template <typename URV>
Csr<URV>*
CsRegs<URV>::findCsr(CsrNumber number)
{
size_t ix = size_t(number);
if (ix >= regs_.size())
return nullptr;
return ®s_.at(ix);
}
template <typename URV>
bool
CsRegs<URV>::read(CsrNumber number, PrivilegeMode mode, URV& value) const
{
auto csr = getImplementedCsr(number);
if (not csr)
return false;
if (mode < csr->privilegeMode())
return false;
if (csr->isDebug())
return false; // Debug-mode register is not accessible by a CSR instruction.
if (number >= CsrNumber::TDATA1 and number <= CsrNumber::TDATA3)
return readTdata(number, mode, value);
if (number == CsrNumber::FFLAGS or number == CsrNumber::FRM)
{
auto fcsr = getImplementedCsr(CsrNumber::FCSR);
if (not fcsr)
return false;
value = fcsr->read();
if (number == CsrNumber::FFLAGS)
value = value & URV(FpFlags::FcsrMask);
else
value = (value & URV(RoundingMode::FcsrMask)) >> URV(RoundingMode::FcsrShift);
return true;
}
// Value of SIP/SIE is that of MIP/MIE modified by SIP/SIE mask
// and delgation register.
if (number == CsrNumber::SIP or number == CsrNumber::SIE)
{
// Get MIP/MIE
auto mcsr = getImplementedCsr(CsrNumber(unsigned(number) + 0x200));
auto deleg = getImplementedCsr(CsrNumber::MIDELEG);
if (mcsr and deleg)
value = mcsr->read() & (csr->getReadMask() | deleg->read());
else
value = csr->read();
return true;
}
value = csr->read();
if (number >= CsrNumber::PMPADDR0 and number <= CsrNumber::PMPADDR15)
value = adjustPmpValue(number, value);
return true;
}
template <typename URV>
void
CsRegs<URV>::enableSupervisorMode(bool flag)
{
supervisorModeEnabled_ = flag;
if (not flag)
return;
for (auto csrn : { CsrNumber::SSTATUS, CsrNumber::SEDELEG, CsrNumber::SIDELEG,
CsrNumber::STVEC, CsrNumber::SIE, CsrNumber::STVEC,
CsrNumber::SCOUNTEREN, CsrNumber::SSCRATCH, CsrNumber::SEPC,
CsrNumber::SCAUSE, CsrNumber::STVAL, CsrNumber::SIP,
CsrNumber::SATP, CsrNumber::MEDELEG, CsrNumber::MIDELEG } )
{
auto csr = findCsr(csrn);
if (not csr)
{
std::cerr << "Error: enableSupervisorMode: CSR number 0x"
<< std::hex << URV(csrn) << " undefined\n";
assert(0);
}
else if (not csr->isImplemented())
csr->setImplemented(true);
}
typedef InterruptCause IC;
// In MIP, make writable/pokable bits corresponding to SEIP/STIP/SSIP
// (supervisor external/timer/software interrupt pending).
URV extra = URV(1) << unsigned(IC::S_EXTERNAL);
extra |= URV(1) << unsigned(IC::S_TIMER);
extra |= URV(1) << unsigned(IC::S_SOFTWARE);
auto csr = findCsr(CsrNumber::MIP);
if (csr)
{
URV mask = csr->getWriteMask();
csr->setWriteMask(mask | extra);
mask = csr->getPokeMask();
csr->setPokeMask(mask | extra);
}
// Same for MIE.
csr = findCsr(CsrNumber::MIE);
if (csr)
{
URV mask = csr->getWriteMask();
csr->setWriteMask(mask | extra);
mask = csr->getPokeMask();
csr->setPokeMask(mask | extra);
}
}
template <typename URV>
URV
CsRegs<URV>::legalizeMstatusValue(URV value) const
{
MstatusFields<URV> fields(value);
PrivilegeMode mode = PrivilegeMode(fields.bits_.MPP);
if (fields.bits_.FS == unsigned(FpFs::Dirty) or fields.bits_.XS == unsigned(FpFs::Dirty))
fields.bits_.SD = 1;
else
fields.bits_.SD = 0;
if (mode == PrivilegeMode::Machine)
return fields.value_;
if (mode == PrivilegeMode::Supervisor and not supervisorModeEnabled_)
mode = PrivilegeMode::User;
if (mode == PrivilegeMode::Reserved)
mode = PrivilegeMode::User;
if (mode == PrivilegeMode::User and not userModeEnabled_)
mode = PrivilegeMode::Machine;
fields.bits_.MPP = unsigned(mode);
return fields.value_;
}
template <typename URV>
bool
CsRegs<URV>::write(CsrNumber number, PrivilegeMode mode, URV value)
{
Csr<URV>* csr = getImplementedCsr(number);
if (not csr)
return false;
if (mode < csr->privilegeMode() or csr->isReadOnly())
return false;
if (csr->isDebug())
return false; // Debug-mode register is not accessible by a CSR instruction.
if (isPmpaddrLocked(number))
{
recordWrite(number);
return true; // Writing a locked PMPADDR register has no effect.
}
// fflags and frm are part of fcsr
if (number == CsrNumber::FFLAGS or number == CsrNumber::FRM or
number == CsrNumber::FCSR)
{
csr->write(value);
recordWrite(number);
updateFcsrGroupForWrite(number, value);
return true;
}
// vxsat and vrm are part of vcsr
if (number == CsrNumber::VXSAT or number == CsrNumber::VXRM or
number == CsrNumber::VCSR)
{
csr->write(value);
recordWrite(number);
updateVcsrGroupForWrite(number, value);
return true;
}
if (number >= CsrNumber::TDATA1 and number <= CsrNumber::TDATA3)
{
if (not writeTdata(number, mode, value))
return false;
recordWrite(number);
return true;
}
// Value of SIP/SIE is that of MIP/MIE modified by SIP/SIE mask
// and delgation register.
if (number == CsrNumber::SIP or number == CsrNumber::SIE)
{
// Get MIP/MIE
auto mcsr = getImplementedCsr(CsrNumber(unsigned(number) + 0x200));
auto deleg = getImplementedCsr(CsrNumber::MIDELEG);
if (mcsr and deleg)
{
URV prevMask = csr->getWriteMask();
csr->setWriteMask((prevMask | deleg->read()) & mcsr->getWriteMask());
csr->write(value);
csr->setWriteMask(prevMask);
}
else
csr->write(value);
recordWrite(number);
return true;
}
if (number >= CsrNumber::MHPMEVENT3 and number <= CsrNumber::MHPMEVENT31)
value = legalizeMhpmevent(number, value);
else if (number >= CsrNumber::PMPCFG0 and number <= CsrNumber::PMPCFG3)
{
URV prev = 0;
peek(number, prev);
value = legalizePmpcfgValue(prev, value);
}
else if (number == CsrNumber::MSTATUS or number == CsrNumber::SSTATUS)
value = legalizeMstatusValue(value);
csr->write(value);
recordWrite(number);
if (number == CsrNumber::MSTATUS or number == CsrNumber::SSTATUS)
{
// Write cannot change SD. Update it with a poke.
MstatusFields<URV> msf(peekMstatus());
if (msf.bits_.FS == unsigned(FpFs::Dirty) or msf.bits_.XS == unsigned(FpFs::Dirty))
msf.bits_.SD = 1;
else
msf.bits_.SD = 0;
csr->poke(msf.value_);
}
// Cache interrupt enable.
if (number == CsrNumber::MSTATUS)
{
MstatusFields<URV> fields(csr->read());
interruptEnable_ = fields.bits_.MIE;
}
// Writing MDEAU unlocks mdseac.
if (number == CsrNumber::MDEAU)
lockMdseac(false);
// Writing MEIVT changes the base address in MEIHAP.
if (number == CsrNumber::MEIVT)
{
value = (value >> 10) << 10; // Clear least sig 10 bits keeping base.
size_t meihapIx = size_t(CsrNumber::MEIHAP);
URV meihap = regs_.at(meihapIx).read();
meihap &= 0x3ff; // Clear base address bits.
meihap |= value; // Copy base address bits from MEIVT.
regs_.at(meihapIx).poke(meihap);
recordWrite(CsrNumber::MEIHAP);
}
// Writing mcounteren/scounteren changes accessibility of the
// counters in user/supervisor modes.
if (number == CsrNumber::MCOUNTEREN or number == CsrNumber::SCOUNTEREN)
updateCounterPrivilege();
return true;
}
template <typename URV>
bool
CsRegs<URV>::isWriteable(CsrNumber number, PrivilegeMode mode ) const
{
const Csr<URV>* csr = getImplementedCsr(number);
if (not csr)
return false;
if (mode < csr->privilegeMode())
return false;
if (csr->isReadOnly())
return false;
if (csr->isDebug())
return false; // Debug-mode register is not accessible by a CSR instruction.
return true;
}
template <typename URV>
void
CsRegs<URV>::reset()
{
for (auto& csr : regs_)
if (csr.isImplemented())
csr.reset();
triggers_.reset();
mPerfRegs_.reset();
// Cache interrupt enable.
Csr<URV>* mstatus = getImplementedCsr(CsrNumber::MSTATUS);
if (mstatus)
{
MstatusFields<URV> fields(mstatus->read());
interruptEnable_ = fields.bits_.MIE;
}
mdseacLocked_ = false;
}
template <typename URV>
bool
CsRegs<URV>::configCsr(const std::string& name, bool implemented, URV resetValue,
URV mask, URV pokeMask, bool isDebug, bool shared)
{
auto iter = nameToNumber_.find(name);
if (iter == nameToNumber_.end())
return false;
size_t num = size_t(iter->second);
if (num >= regs_.size())
return false;
return configCsr(CsrNumber(num), implemented, resetValue, mask, pokeMask,
isDebug, shared);
}
template <typename URV>
bool
CsRegs<URV>::configCsr(CsrNumber csrNum, bool implemented, URV resetValue,
URV mask, URV pokeMask, bool isDebug, bool shared)
{
if (size_t(csrNum) >= regs_.size())
{
std::cerr << "ConfigCsr: CSR number " << size_t(csrNum)
<< " out of bound\n";
return false;
}
auto& csr = regs_.at(size_t(csrNum));
if (csr.isMandatory() and not implemented)
{
std::cerr << "CSR " << csr.getName() << " is mandatory and is being "
<< "configured as not-implemented -- configuration ignored.\n";
return false;
}
csr.setImplemented(implemented);
csr.setInitialValue(resetValue);
csr.setWriteMask(mask);
csr.setPokeMask(pokeMask);
csr.pokeNoMask(resetValue);
csr.setIsDebug(isDebug);
csr.setIsShared(shared);
// Cahche interrupt enable.
if (csrNum == CsrNumber::MSTATUS)
{
MstatusFields<URV> fields(csr.read());
interruptEnable_ = fields.bits_.MIE;
}
return true;
}
template <typename URV>
bool
CsRegs<URV>::configMachineModePerfCounters(unsigned numCounters)
{
if (numCounters > 29)
{
std::cerr << "No more than 29 machine mode performance counters "
<< "can be defined\n";
return false;
}
unsigned errors = 0;
bool shared = false;
for (unsigned i = 0; i < 29; ++i)
{
URV resetValue = 0, mask = ~URV(0), pokeMask = ~URV(0);
if (i >= numCounters)
mask = pokeMask = 0;
CsrNumber csrNum = CsrNumber(i + unsigned(CsrNumber::MHPMCOUNTER3));
bool isDebug = false;
if (not configCsr(csrNum, true, resetValue, mask, pokeMask, isDebug,
shared))
errors++;
if (rv32_)
{
csrNum = CsrNumber(i + unsigned(CsrNumber::MHPMCOUNTER3H));
if (not configCsr(csrNum, true, resetValue, mask, pokeMask,
isDebug, shared))
errors++;
}
csrNum = CsrNumber(i + unsigned(CsrNumber::MHPMEVENT3));
if (not configCsr(csrNum, true, resetValue, mask, pokeMask, isDebug,
shared))
errors++;
}
if (errors == 0)
{
mPerfRegs_.config(numCounters, maxEventId_);
tiePerfCounters(mPerfRegs_.counters_);
}
return errors == 0;
}
template <typename URV>
bool
CsRegs<URV>::configUserModePerfCounters(unsigned numCounters)
{
if (numCounters > mPerfRegs_.size())
{
std::cerr << "User mode number of performance counters (" << numCounters
<< ") cannot exceed that of machine mode ("
<< mPerfRegs_.size() << '\n';
return false;
}
unsigned errors = 0;
bool shared = false;
for (unsigned i = 0; i < 29; ++i)
{
URV resetValue = 0, mask = ~URV(0), pokeMask = ~URV(0);
if (i >= numCounters)
mask = pokeMask = 0;
CsrNumber csrNum = CsrNumber(i + unsigned(CsrNumber::HPMCOUNTER3));
bool isDebug = false;
if (not configCsr(csrNum, true, resetValue, mask, pokeMask, isDebug,
shared))
errors++;
if (rv32_)
{
csrNum = CsrNumber(i + unsigned(CsrNumber::HPMCOUNTER3H));
if (not configCsr(csrNum, true, resetValue, mask, pokeMask,
isDebug, shared))
errors++;
}
}
return errors == 0;
}
/// Map a RISCV rounding mode to an fetsetround constant.
static std::array<int, 5> riscvRoundingModeToFe =
{
FE_TONEAREST, // NearsetEven
FE_TOWARDZERO, // Zero
FE_DOWNWARD, // Down
FE_UPWARD, // Up
FE_TONEAREST // NearestMax
};
static
inline
int
mapRiscvRoundingModeToFe(RoundingMode mode)
{
uint32_t ix = uint32_t(mode);
if (ix < riscvRoundingModeToFe.size())
return riscvRoundingModeToFe.at(ix);
// For dynamic mode, it does not matter to what we set the host machine
// fp mode since it will be changed by the floating point instructions.
return FE_TONEAREST;
}
static
inline
int
setSimulatorRoundingMode(RoundingMode mode)
{
int previous = std::fegetround();
int next = mapRiscvRoundingModeToFe(mode);
if (next != previous)
std::fesetround(next);
return previous;
}
template <typename URV>
void
CsRegs<URV>::updateFcsrGroupForWrite(CsrNumber number, URV value)
{
if (number == CsrNumber::FFLAGS)
{
auto fcsr = getImplementedCsr(CsrNumber::FCSR);
if (fcsr)
{
URV mask = URV(FpFlags::FcsrMask);
URV fcsrVal = fcsr->read();
fcsrVal = (fcsrVal & ~mask) | (value & mask);
fcsr->write(fcsrVal);
// recordWrite(CsrNumber::FCSR);
}
return;
}
if (number == CsrNumber::FRM)
{
auto fcsr = getImplementedCsr(CsrNumber::FCSR);
if (fcsr)
{
URV fcsrVal = fcsr->read();
URV mask = URV(RoundingMode::FcsrMask);
URV shift = URV(RoundingMode::FcsrShift);
fcsrVal = (fcsrVal & ~mask) | ((value << shift) & mask);
fcsr->write(fcsrVal);
// recordWrite(CsrNumber::FCSR);
setSimulatorRoundingMode(RoundingMode((fcsrVal & mask) >> shift));
}
return;
}
if (number == CsrNumber::FCSR)
{
URV newVal = value & URV(FpFlags::FcsrMask);
auto fflags = getImplementedCsr(CsrNumber::FFLAGS);
if (fflags and fflags->read() != newVal)
{
fflags->write(newVal);
// recordWrite(CsrNumber::FFLAGS);
}
newVal = (value & URV(RoundingMode::FcsrMask)) >> URV(RoundingMode::FcsrShift);
auto frm = getImplementedCsr(CsrNumber::FRM);
if (frm and frm->read() != newVal)
{
frm->write(newVal);
// recordWrite(CsrNumber::FRM);
}
setSimulatorRoundingMode(RoundingMode(newVal));
}
}
template <typename URV>
void
CsRegs<URV>::updateFcsrGroupForPoke(CsrNumber number, URV value)
{
if (number == CsrNumber::FFLAGS)
{
auto fcsr = getImplementedCsr(CsrNumber::FCSR);
if (fcsr)
{
URV mask = URV(FpFlags::FcsrMask);
URV fcsrVal = fcsr->read();
fcsrVal = (fcsrVal & ~mask) | (value & mask);
fcsr->poke(fcsrVal);
}
return;
}
if (number == CsrNumber::FRM)
{
auto fcsr = getImplementedCsr(CsrNumber::FCSR);
if (fcsr)
{
URV fcsrVal = fcsr->read();
URV mask = URV(RoundingMode::FcsrMask);
URV shift = URV(RoundingMode::FcsrShift);
fcsrVal = (fcsrVal & ~mask) | ((value << shift) & mask);
fcsr->poke(fcsrVal);
setSimulatorRoundingMode(RoundingMode((fcsrVal & mask) >> shift));
}
return;
}
if (number == CsrNumber::FCSR)
{
URV newVal = value & URV(FpFlags::FcsrMask);
auto fflags = getImplementedCsr(CsrNumber::FFLAGS);
if (fflags and fflags->read() != newVal)
fflags->poke(newVal);
newVal = (value & URV(RoundingMode::FcsrMask)) >> URV(RoundingMode::FcsrShift);
auto frm = getImplementedCsr(CsrNumber::FRM);
if (frm and frm->read() != newVal)
frm->poke(newVal);
setSimulatorRoundingMode(RoundingMode(newVal));
}
}
template <typename URV>
void
CsRegs<URV>::updateVcsrGroupForWrite(CsrNumber number, URV value)
{
if (number == CsrNumber::VXSAT)
{
auto vcsr = getImplementedCsr(CsrNumber::VCSR);
if (vcsr)
{
URV mask = 1;
URV vcsrVal = vcsr->read();
vcsrVal = (vcsrVal & ~mask) | (value & mask);
vcsr->write(vcsrVal);
// recordWrite(CsrNumber::VCSR);
}
return;
}
if (number == CsrNumber::VXRM)
{
auto vcsr = getImplementedCsr(CsrNumber::VCSR);
if (vcsr)
{
URV vcsrVal = vcsr->read();
URV mask = URV(VecRoundingMode::VcsrMask);
URV shift = URV(VecRoundingMode::VcsrShift);
vcsrVal = (vcsrVal & ~mask) | ((value << shift) & mask);
vcsr->write(vcsrVal);
// recordWrite(CsrNumber::VCSR);
}
return;
}
if (number == CsrNumber::VCSR)
{
URV newVal = value & 1;
auto vxsat = getImplementedCsr(CsrNumber::VXSAT);
if (vxsat and vxsat->read() != newVal)
{
vxsat->write(newVal);
// recordWrite(CsrNumber::VXSAT);
}
newVal = (value & URV(VecRoundingMode::VcsrMask)) >> URV(VecRoundingMode::VcsrShift);
auto vxrm = getImplementedCsr(CsrNumber::VXRM);
if (vxrm and vxrm->read() != newVal)
{
vxrm->write(newVal);
// recordWrite(CsrNumber::VXRM);
}
}
}
template <typename URV>
void
CsRegs<URV>::updateVcsrGroupForPoke(CsrNumber number, URV value)
{
if (number == CsrNumber::VXSAT)
{
auto vcsr = getImplementedCsr(CsrNumber::VCSR);
if (vcsr)
{
URV mask = 1;
URV vcsrVal = vcsr->read();
vcsrVal = (vcsrVal & ~mask) | (value & mask);
vcsr->poke(vcsrVal);
}
return;
}
if (number == CsrNumber::VXRM)
{
auto vcsr = getImplementedCsr(CsrNumber::VCSR);
if (vcsr)
{
URV vcsrVal = vcsr->read();
URV mask = URV(VecRoundingMode::VcsrMask);
URV shift = URV(VecRoundingMode::VcsrShift);
vcsrVal = (vcsrVal & ~mask) | ((value << shift) & mask);
vcsr->poke(vcsrVal);
}
return;
}
if (number == CsrNumber::VCSR)
{
URV newVal = value & 1;
auto vxsat = getImplementedCsr(CsrNumber::VXSAT);
if (vxsat and vxsat->read() != newVal)
vxsat->poke(newVal);
newVal = (value & URV(VecRoundingMode::VcsrMask)) >> URV(VecRoundingMode::VcsrShift);
auto vxrm = getImplementedCsr(CsrNumber::VXRM);
if (vxrm and vxrm->read() != newVal)
vxrm->poke(newVal);
}
}
template <typename URV>
void
CsRegs<URV>::recordWrite(CsrNumber num)
{
auto& lwr = lastWrittenRegs_;
if (std::find(lwr.begin(), lwr.end(), num) == lwr.end())
lwr.push_back(num);
}
template <typename URV>
void
CsRegs<URV>::defineMachineRegs()
{
URV rom = 0; // Read-only mask: no bit writeable.
URV wam = ~URV(0); // Write-all mask: all bits writeable.
bool mand = true; // Mandatory.
bool imp = true; // Implemented.
using Csrn = CsrNumber;
// Machine info.
defineCsr("mvendorid", Csrn::MVENDORID, mand, imp, 0, rom, rom);
defineCsr("marchid", Csrn::MARCHID, mand, imp, 0, rom, rom);
defineCsr("mimpid", Csrn::MIMPID, mand, imp, 0, rom, rom);
defineCsr("mhartid", Csrn::MHARTID, mand, imp, 0, rom, rom);
// Machine status setup.
// mstatus
// S R T T T M S M X F M R S M R S U M R S U
// D E S W V X U P S S P E P P E P P I E I I
// S R M R M R P S P I S I I E S E E
// V E E E
URV mask = 0b0'00000000'1'1'1'1'1'1'11'11'11'00'1'1'0'1'0'1'0'1'0;
URV val = 0;
if (not rv32_)
{
mask |= uint64_t(0b0000) << 32; // Mask for SXL and UXL (currently not writable).
val |= uint64_t(0b1010) << 32; // Value of SXL and UXL : sxlen=uxlen=64
}
URV pokeMask = mask | (URV(1) << (sizeof(URV)*8 - 1)); // Make SD pokable.
defineCsr("mstatus", Csrn::MSTATUS, mand, imp, val, mask, pokeMask);
defineCsr("misa", Csrn::MISA, mand, imp, 0x40001104, rom, rom);
// Bits corresponding to user-level interrupts are hardwired to zero
// in medeleg. If N extension is enabled, we will flip those bits
// (currently N extension is not supported).
URV userBits = ( (URV(1) << unsigned(InterruptCause::U_SOFTWARE)) |
(URV(1) << unsigned(InterruptCause::U_TIMER)) |
(URV(1) << unsigned(InterruptCause::U_EXTERNAL)) );
mask = wam & ~ userBits;
defineCsr("medeleg", Csrn::MEDELEG, !mand, !imp, 0, mask, mask);
defineCsr("mideleg", Csrn::MIDELEG, !mand, !imp, 0, wam, wam);
// Interrupt enable: Least sig 12 bits corresponding to the 12
// interrupt causes are writable.
URV mieMask = 0xfff;
defineCsr("mie", Csrn::MIE, mand, imp, 0, mieMask, mieMask);
// Initial value of 0: vectored interrupt. Mask of ~2 to make bit 1
// non-writable.
mask = ~URV(2);
defineCsr("mtvec", Csrn::MTVEC, mand, imp, 0, mask, mask);
defineCsr("mcounteren", Csrn::MCOUNTEREN, !mand, imp, 0, wam, wam);
defineCsr("mcountinhibit", Csrn::MCOUNTINHIBIT, !mand, imp, 0, wam, wam);
// Machine trap handling: mscratch and mepc.
defineCsr("mscratch", Csrn::MSCRATCH, mand, imp, 0, wam, wam);
mask = ~URV(1); // Bit 0 of MEPC is not writable.
defineCsr("mepc", Csrn::MEPC, mand, imp, 0, mask, mask);
// All bits of mcause writeable.
defineCsr("mcause", Csrn::MCAUSE, mand, imp, 0, wam, wam);
defineCsr("mtval", Csrn::MTVAL, mand, imp, 0, wam, wam);
// MIP is read-only for CSR instructions but the bits corresponding
// to defined interrupts are modifiable.
defineCsr("mip", CsrNumber::MIP, mand, imp, 0, rom, mieMask);
// Physical memory protection. PMPCFG1 and PMPCFG3 are present only
// in 32-bit implementations.
uint64_t cfgMask = 0x9f9f9f9f;
if (not rv32_)
cfgMask = 0x9f9f9f9f9f9f9f9fL;
defineCsr("pmpcfg0", Csrn::PMPCFG0, !mand, imp, 0, cfgMask, cfgMask);
defineCsr("pmpcfg2", Csrn::PMPCFG2, !mand, imp, 0, cfgMask, cfgMask);
if (rv32_)
{
defineCsr("pmpcfg1", Csrn::PMPCFG1, !mand, imp, 0, cfgMask, cfgMask);
defineCsr("pmpcfg3", Csrn::PMPCFG3, !mand, imp, 0, cfgMask, cfgMask);
}
else
{
defineCsr("pmpcfg1", Csrn::PMPCFG1, !mand, !imp, 0, cfgMask, cfgMask);
defineCsr("pmpcfg3", Csrn::PMPCFG3, !mand, !imp, 0, cfgMask, cfgMask);
}
uint64_t pmpMask = 0xffffffff;
if (not rv32_)
pmpMask = 0x003f'ffff'ffff'ffffL; // Top 10 bits are zeros
defineCsr("pmpaddr0", Csrn::PMPADDR0, !mand, imp, 0, pmpMask, pmpMask);
defineCsr("pmpaddr1", Csrn::PMPADDR1, !mand, imp, 0, pmpMask, pmpMask);
defineCsr("pmpaddr2", Csrn::PMPADDR2, !mand, imp, 0, pmpMask, pmpMask);
defineCsr("pmpaddr3", Csrn::PMPADDR3, !mand, imp, 0, pmpMask, pmpMask);
defineCsr("pmpaddr4", Csrn::PMPADDR4, !mand, imp, 0, pmpMask, pmpMask);
defineCsr("pmpaddr5", Csrn::PMPADDR5, !mand, imp, 0, pmpMask, pmpMask);
defineCsr("pmpaddr6", Csrn::PMPADDR6, !mand, imp, 0, pmpMask, pmpMask);
defineCsr("pmpaddr7", Csrn::PMPADDR7, !mand, imp, 0, pmpMask, pmpMask);
defineCsr("pmpaddr8", Csrn::PMPADDR8, !mand, imp, 0, pmpMask, pmpMask);
defineCsr("pmpaddr9", Csrn::PMPADDR9, !mand, imp, 0, pmpMask, pmpMask);
defineCsr("pmpaddr10", Csrn::PMPADDR10, !mand, imp, 0, pmpMask, pmpMask);
defineCsr("pmpaddr11", Csrn::PMPADDR11, !mand, imp, 0, pmpMask, pmpMask);
defineCsr("pmpaddr12", Csrn::PMPADDR12, !mand, imp, 0, pmpMask, pmpMask);
defineCsr("pmpaddr13", Csrn::PMPADDR13, !mand, imp, 0, pmpMask, pmpMask);
defineCsr("pmpaddr14", Csrn::PMPADDR14, !mand, imp, 0, pmpMask, pmpMask);
defineCsr("pmpaddr15", Csrn::PMPADDR15, !mand, imp, 0, pmpMask, pmpMask);
// Machine Counter/Timers.
defineCsr("mcycle", Csrn::MCYCLE, mand, imp, 0, wam, wam);
defineCsr("minstret", Csrn::MINSTRET, mand, imp, 0, wam, wam);
if (rv32_)
{
defineCsr("mcycleh", Csrn::MCYCLEH, mand, imp, 0, wam, wam);
defineCsr("minstreth", Csrn::MINSTRETH, mand, imp, 0, wam, wam);
}
// Define mhpmcounter3/mhpmcounter3h to mhpmcounter31/mhpmcounter31h
// as write-anything/read-zero (user can change that in the config
// file by setting the number of writeable counters). Same for
// mhpmevent3/mhpmevent3h to mhpmevent3h/mhpmevent31h.
for (unsigned i = 3; i <= 31; ++i)
{
CsrNumber csrNum = CsrNumber(unsigned(CsrNumber::MHPMCOUNTER3) + i - 3);
std::string name = "mhpmcounter" + std::to_string(i);
defineCsr(name, csrNum, mand, imp, 0, rom, rom);
if (rv32_)
{
// High register counterpart of mhpmcounter.
name += "h";
csrNum = CsrNumber(unsigned(CsrNumber::MHPMCOUNTER3H) + i - 3);
bool hmand = rv32_; // high counters mandatory only in rv32
defineCsr(name, csrNum, hmand, imp, 0, rom, rom);
}
csrNum = CsrNumber(unsigned(CsrNumber::MHPMEVENT3) + i - 3);
name = "mhpmevent" + std::to_string(i);
defineCsr(name, csrNum, mand, imp, 0, rom, rom);
}
}
template <typename URV>
void
CsRegs<URV>::tieSharedCsrsTo(CsRegs<URV>& target)
{
if (this == &target)
return;
assert(regs_.size() == target.regs_.size());
for (size_t i = 0; i < regs_.size(); ++i)
{
CsrNumber csrn = CsrNumber(i);
auto csr = getImplementedCsr(csrn);
auto targetCsr = target.getImplementedCsr(csrn);
if (csr)
{
assert(targetCsr);
if (csr->isShared())
{
assert(targetCsr->isShared());
csr->tie(targetCsr->valuePtr_);
}
}
else
assert(not targetCsr);
}
}