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HartConfig.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 <nlohmann/json.hpp>
#include <fstream>
#include <iostream>
#include "HartConfig.hpp"
#include "System.hpp"
#include "Core.hpp"
#include "Hart.hpp"
using namespace WdRiscv;
HartConfig::HartConfig()
{
config_ = new nlohmann::json();
}
HartConfig::~HartConfig()
{
delete config_;
config_ = nullptr;
}
bool
HartConfig::loadConfigFile(const std::string& filePath)
{
std::ifstream ifs(filePath);
if (not ifs.good())
{
std::cerr << "Failed to open config file '" << filePath
<< "' for input.\n";
return false;
}
try
{
ifs >> *config_;
}
catch (std::exception& e)
{
std::cerr << e.what() << "\n";
return false;
}
catch (...)
{
std::cerr << "Caught unknown exception while parsing "
<< " config file '" << filePath << "'\n";
return false;
}
return true;
}
namespace WdRiscv
{
/// Convert given json entry to an unsigned integer value honoring
/// hexadecimal prefix (0x) if any. Return true on succes and false
/// if given entry does not represent an integer.
template <typename URV>
bool
getJsonUnsigned(const std::string& tag, const nlohmann::json& js, URV& value)
{
value = 0;
if (js.is_number())
{
value = js.get<URV>();
return true;
}
if (js.is_string())
{
char *end = nullptr;
std::string str = js.get<std::string>();
uint64_t u64 = strtoull(str.c_str(), &end, 0);
if (end and *end)
{
std::cerr << "Invalid config file value for '" << tag << "': "
<< str << '\n';
return false;
}
value = static_cast<URV>(u64);
if (value != u64)
{
std::cerr << "Overflow in config file value for '" << tag << "': "
<< str << '\n';
return false;
}
return true;
}
std::cerr << "Config file entry '" << tag << "' must contain a number\n";
return false;
}
/// Convert given json array value to a vector of unsigned integers
/// honoring any hexadecimal prefix (0x) if any. Return true on
/// sucess an false on failure.
template <typename URV>
bool
getJsonUnsignedVec(const std::string& tag, const nlohmann::json& js,
std::vector<URV>& vec)
{
vec.clear();
if (not js.is_array())
{
std::cerr << "Invalid config file value for '" << tag << "'"
<< " -- expecting array of numbers\n";
return false;
}
unsigned errors = 0;
for (const auto& item :js)
{
if (item.is_number())
vec.push_back(item.get<unsigned>());
else if (item.is_string())
{
char *end = nullptr;
std::string str = item.get<std::string>();
uint64_t u64 = strtoull(str.c_str(), &end, 0);
if (end and *end)
{
std::cerr << "Invalid config file value for '" << tag << "': "
<< str << '\n';
errors++;
continue;
}
URV val = static_cast<URV>(u64);
if (val != u64)
{
std::cerr << "Overflow in config file value for '" << tag
<< "': " << str << '\n';
errors++;
continue;
}
vec.push_back(val);
}
else
{
std::cerr << "Invalid config file value for '" << tag << "'"
<< " -- expecting array of number\n";
errors++;
}
}
return errors == 0;
}
/// Convert given json entry to a boolean value. Return ture on
/// success and false on failure.
bool
getJsonBoolean(const std::string& tag, const nlohmann::json& js, bool& value)
{
value = false;
if (js.is_boolean())
{
value = js.get<bool>();
return true;
}
if (js.is_number())
{
value = js.get<unsigned>() != 0;
return true;
}
if (js.is_string())
{
std::string str = js.get<std::string>();
if (str == "0" or str == "false" or str == "False")
value = false;
else if (str == "1" or str == "true" or str == "True")
value = true;
else
{
std::cerr << "Invalid config file value for '" << tag << "': "
<< str << '\n';
return false;
}
return true;
}
std::cerr << "Config file entry '" << tag << "' must contain a bool\n";
return false;
}
}
static
bool
validateStackChecker(const nlohmann::json& csrs)
{
// If any of the stack checker CSRs is present then all must be
// present.
auto tags = { "mspcba", "mspcta", "mspcc" };
std::string present;
unsigned count = 0;
for (const auto& tag : tags)
if (csrs.count(tag))
{
present = tag;
count++;
}
if (count == 0)
return true;
if (count != tags.size())
{
std::cerr << "Error: Not all stack checker CSRs are defined:\n";
std::cerr << " Defined: ";
std::string sep = "";
for (const auto& tag: tags)
if (csrs.count(tag))
{
std::cerr << sep << tag;
sep = ", ";
}
sep.clear();
std::cerr << " Missing: ";
for (const auto& tag: tags)
if (not csrs.count(tag))
{
std::cerr << sep << tag;
sep = ", ";
}
return false;
}
return true;
}
template <typename URV>
static
bool
applyCsrConfig(Hart<URV>& hart, const nlohmann::json& config, bool verbose)
{
if (not config.count("csr"))
return true; // Nothing to apply
const auto& csrs = config.at("csr");
if (not csrs.is_object())
{
std::cerr << "Invalid csr entry in config file (expecting an object)\n";
return false;
}
unsigned errors = 0;
for (auto it = csrs.begin(); it != csrs.end(); ++it)
{
const std::string& csrName = it.key();
const auto& conf = it.value();
URV reset = 0, mask = 0, pokeMask = 0;
bool isDebug = false, exists = true, shared = false;
Csr<URV>* csr = hart.findCsr(csrName);
if (csr)
{
reset = csr->getResetValue();
mask = csr->getWriteMask();
pokeMask = csr->getPokeMask();
isDebug = csr->isDebug();
}
if (conf.count("reset"))
if (not getJsonUnsigned(csrName + ".reset", conf.at("reset"), reset))
errors++;
if (conf.count("mask"))
{
if (not getJsonUnsigned(csrName + ".mask", conf.at("mask"), mask))
errors++;
// If defining a non-standard CSR (as popposed to
// configuring an existing CSR) then default the poke-mask
// to the write-mask.
if (not csr)
pokeMask = mask;
}
if (conf.count("poke_mask"))
if (not getJsonUnsigned(csrName + ".poke_mask", conf.at("poke_mask"), pokeMask))
errors++;
if (conf.count("debug"))
if (not getJsonBoolean(csrName + ".bool", conf.at("debug"), isDebug))
errors++;
if (conf.count("exists"))
if (not getJsonBoolean(csrName + ".bool", conf.at("exists"), exists))
errors++;
if (conf.count("shared"))
if (not getJsonBoolean(csrName + ".bool", conf.at("shared"), shared))
errors++;
// If number present and csr is not defined, then define a new
// CSR; otherwise, configure.
if (conf.count("number"))
{
unsigned number = 0;
if (not getJsonUnsigned<unsigned>(csrName + ".number", conf.at("number"), number))
errors++;
else
{
if (csr)
{
if (csr->getNumber() != CsrNumber(number))
{
std::cerr << "Invalid config file entry for CSR "
<< csrName << ": Number (0x" << std::hex << number
<< ") does not match that of previous definition ("
<< "0x" << unsigned(csr->getNumber())
<< ")\n" << std::dec;
errors++;
continue;
}
// If number matches we configure below
}
else if (hart.defineCsr(csrName, CsrNumber(number), exists,
reset, mask, pokeMask, isDebug))
{
csr = hart.findCsr(csrName);
assert(csr);
}
else
{
std::cerr << "Invalid config file CSR definition with name "
<< csrName << " and number 0x" << std::hex << number
<< ": Number already in use\n" << std::dec;
errors++;
continue;
}
}
}
bool exists0 = csr->isImplemented(), isDebug0 = csr->isDebug();
bool shared0 = csr->isShared();
URV reset0 = csr->getResetValue(), mask0 = csr->getWriteMask();
URV pokeMask0 = csr->getPokeMask();
if (csrName == "mhartstart")
if (hart.sysHartIndex() == 0 and (reset & 1) == 0)
std::cerr << "Warning: Bit corresponding to hart 0 is cleared "
<< "in reset value of mhartstart CSR -- Bit is ignored\n";
// Add hart-index to the base-hart-id (which is common to all
// the harts in the core).
if (csrName == "mhartid")
{
std::cerr << "CSR mhartid cannot be configured.\n";
std::cerr << "Ignoring mhartid CSR configuration in config file.\n";
continue;
}
if (not hart.configCsr(csrName, exists, reset, mask, pokeMask,
isDebug, shared))
{
std::cerr << "Invalid CSR (" << csrName << ") in config file.\n";
errors++;
}
else if (verbose)
{
if (exists0 != exists or isDebug0 != isDebug or reset0 != reset or
mask0 != mask or pokeMask0 != pokeMask)
{
std::cerr << "Configuration of CSR (" << csrName <<
") changed in config file:\n";
if (exists0 != exists)
std::cerr << " implemented: " << exists0 << " to "
<< exists << '\n';
if (isDebug0 != isDebug)
std::cerr << " debug: " << isDebug0 << " to "
<< isDebug << '\n';
if (shared0 != shared)
std::cerr << " shred: " << shared0 << " to "
<< shared << '\n';
if (reset0 != reset)
std::cerr << " reset: 0x" << std::hex << reset0
<< " to 0x" << reset << '\n' << std::dec;
if (mask0 != mask)
std::cerr << " mask: 0x" << std::hex << mask0
<< " to 0x" << mask << '\n' << std::dec;
if (pokeMask0 != pokeMask)
std::cerr << " poke_mask: " << std::hex << pokeMask0
<< " to 0x" << pokeMask << '\n' << std::dec;
}
}
}
// Stack checker.
if (not validateStackChecker(csrs))
errors++;
return errors == 0;
}
template <typename URV>
static
bool
applyMemMappedRegConfig(Hart<URV>& hart, const nlohmann::json& config)
{
if (not config.count("memory_mapped_registers"))
return true; // Nothing to apply.
const auto& mmr = config.at("memory_mapped_registers");
unsigned errors = 0;
// Define memory-mapped-register region.
uint64_t addr = 0, size = 0;
if (getJsonUnsigned("address", mmr.at("address"), addr) and
getJsonUnsigned("size", mmr.at("size"), size))
{
if (not hart.defineMemoryMappedRegisterArea(addr, size))
return false;
}
else
errors++;
// Start by giving all registers in region a default mask.
size_t possibleRegCount = size / 4;
if (mmr.count("default_mask"))
{
uint32_t mask = 0;
if (getJsonUnsigned("default_mask", mmr.at("default_mask"), mask))
for (size_t ix = 0; ix < possibleRegCount; ++ix)
hart.defineMemoryMappedRegisterWriteMask(addr + ix*4, mask);
else
errors++;
}
if (not mmr.count("registers"))
return true;
const auto& regs = mmr.at("registers");
if (not regs.is_object())
{
std::cerr << "Invalid memory_mapped_registers.registers entry "
<< "in config file (expecting an object)\n";
return false;
}
for (auto it = regs.begin(); it != regs.end(); ++it)
{
const std::string& name = it.key();
const auto& conf = it.value();
if (not conf.count("count") or not conf.count("address") or
not conf.count("mask"))
{
std::cerr << "Register entry \"" << name << "\"under "
<< "memory_mapped_registers must have count/address/mask\n";
errors++;
continue;
}
URV count = 0, mask = 0, addr = 0;
if (getJsonUnsigned("count", conf.at("count"), count) and
getJsonUnsigned("mask", conf.at("mask"), mask) and
getJsonUnsigned("address", conf.at("address"), addr))
{
for (URV ix = 0; ix < count; ++ix)
if (not hart.defineMemoryMappedRegisterWriteMask(addr + ix*4, mask))
errors++;
}
else
errors++;
}
return errors == 0;
}
template <typename URV>
static
bool
applyIccmConfig(Hart<URV>& hart, const nlohmann::json& config)
{
if (not config.count("iccm"))
return true;
const auto& iccm = config.at("iccm");
if (iccm.count("region") and iccm.count("size") and iccm.count("offset"))
{
size_t region = 0, size = 0, offset = 0;
if (getJsonUnsigned("iccm.region", iccm.at("region"), region) and
getJsonUnsigned("iccm.size", iccm.at("size"), size) and
getJsonUnsigned("iccm.offset", iccm.at("offset"), offset))
{
size_t addr = region*hart.regionSize() + offset;
return hart.defineIccm(addr, size);
}
else
return false;
}
std::cerr << "The ICCM entry in the configuration file must contain "
<< "a region, offset and a size entry.\n";
return false;
}
template <typename URV>
static
bool
applyDccmConfig(Hart<URV>& hart, const nlohmann::json& config)
{
if (not config.count("dccm"))
return true;
const auto& dccm = config.at("dccm");
if (dccm.count("region") and dccm.count("size") and dccm.count("offset"))
{
size_t region = 0, size = 0, offset = 0;
if (getJsonUnsigned("dccm.region", dccm.at("region"), region) and
getJsonUnsigned("dccm.size", dccm.at("size"), size) and
getJsonUnsigned("dccm.offset", dccm.at("offset"), offset))
{
size_t addr = region*hart.regionSize() + offset;
return hart.defineDccm(addr, size);
}
return false;
}
std::cerr << "The DCCM entry in the configuration file must contain "
<< "a region, offset and a size entry.\n";
return false;
}
template <typename URV>
static
bool
applyTriggerConfig(Hart<URV>& hart, const nlohmann::json& config)
{
if (not config.count("triggers"))
return true; // Nothing to apply
const auto& triggers = config.at("triggers");
if (not triggers.is_array())
{
std::cerr << "Invalid triggers entry in config file (expecting an array)\n";
return false;
}
unsigned errors = 0;
unsigned ix = 0;
for (auto it = triggers.begin(); it != triggers.end(); ++it, ++ix)
{
const auto& trig = *it;
std::string name = std::string("trigger") + std::to_string(ix);
if (not trig.is_object())
{
std::cerr << "Invalid trigger in config file triggers array "
<< "(expecting an object at index " << ix << ")\n";
++errors;
break;
}
bool ok = true;
for (const auto& tag : {"reset", "mask", "poke_mask"})
if (not trig.count(tag))
{
std::cerr << "Trigger " << name << " has no '" << tag
<< "' entry in config file\n";
ok = false;
}
if (not ok)
{
errors++;
continue;
}
std::vector<URV> resets, masks, pokeMasks;
ok = (getJsonUnsignedVec(name + ".reset", trig.at("reset"), resets) and
getJsonUnsignedVec(name + ".mask", trig.at("mask"), masks) and
getJsonUnsignedVec(name + ".poke_mask", trig.at("poke_mask"), pokeMasks));
if (not ok)
{
errors++;
continue;
}
if (resets.size() != 3)
{
std::cerr << "Trigger " << name << ": Bad item count (" << resets.size()
<< ") for 'reset' field in config file. Expecting 3.\n";
ok = false;
}
if (masks.size() != 3)
{
std::cerr << "Trigger " << name << ": Bad item count (" << masks.size()
<< ") for 'mask' field in config file. Expecting 3.\n";
ok = false;
}
if (pokeMasks.size() != 3)
{
std::cerr << "Trigger " << name << ": Bad item count (" << pokeMasks.size()
<< ") for 'poke_mask' field in config file. Expecting 3.\n";
ok = false;
}
if (not ok)
{
errors++;
continue;
}
if (not hart.configTrigger(ix, resets.at(0), resets.at(1), resets.at(2),
masks.at(0), masks.at(1), masks.at(2),
pokeMasks.at(0), pokeMasks.at(1),
pokeMasks.at(2)))
{
std::cerr << "Failed to configure trigger " << std::dec << ix << '\n';
++errors;
}
}
return errors == 0;
}
template <typename URV>
static
bool
applyPerfEvents(Hart<URV>& hart, const nlohmann::json& config,
bool userMode, bool /*verbose*/)
{
unsigned errors = 0;
std::string tag = "num_mmode_perf_regs";
if (config.count(tag))
{
unsigned count = 0;
if (not getJsonUnsigned<unsigned>(tag, config.at(tag), count))
errors++;
else
{
if (not hart.configMachineModePerfCounters(count))
errors++;
if (userMode)
if (not hart.configUserModePerfCounters(count))
errors++;
}
}
unsigned maxPerfId = 0;
tag = "max_mmode_perf_event";
if (config.count(tag))
{
if (not getJsonUnsigned<unsigned>(tag, config.at(tag), maxPerfId))
errors++;
else
{
unsigned limit = 16*1024;
if (maxPerfId > limit)
{
std::cerr << "Config file max_mmode_perf_event too large -- Using "
<< limit << '\n';
maxPerfId = limit;
}
hart.configMachineModeMaxPerfEvent(maxPerfId);
}
}
tag = "mmode_perf_events";
if (config.count(tag))
{
std::vector<unsigned> eventsVec;
const auto& events = config.at(tag);
if (not events.is_array())
{
std::cerr << "Invalid mmode_perf_events entry in config file (expecting an array)\n";
errors++;
}
else
{
unsigned ix = 0;
for (auto it = events.begin(); it != events.end(); ++it, ++ix)
{
const auto& event = *it;
std::string elemTag = tag + "element " + std::to_string(ix);
unsigned eventId = 0;
if (not getJsonUnsigned<unsigned>(elemTag, event, eventId))
errors++;
else
eventsVec.push_back(eventId);
}
}
hart.configPerfEvents(eventsVec);
}
return errors == 0;
}
template <typename URV>
static
bool
applyVectorConfig(Hart<URV>& hart, const nlohmann::json& config)
{
if (not config.count("vector"))
return true; // Nothing to apply
unsigned errors = 0;
const auto& vconf = config.at("vector");
unsigned bytesPerVec = 0;
std::string tag = "bytes_per_vec";
if (not vconf.count(tag))
{
std::cerr << "Error: Missing " << tag << " tag in vector section of config file\n";
errors++;
}
else
{
if (not getJsonUnsigned(tag, vconf.at(tag), bytesPerVec))
errors++;
else if (bytesPerVec == 0 or bytesPerVec > 4096)
{
std::cerr << "Error: Invalid config file bytes_per_vec number: "
<< bytesPerVec << '\n';
errors++;
}
else
{
unsigned l2BytesPerVec = std::log2(bytesPerVec);
unsigned p2BytesPerVec = uint32_t(1) << l2BytesPerVec;
if (p2BytesPerVec != bytesPerVec)
{
std::cerr << "Error: Config file bytes_per_vec ("
<< bytesPerVec << ") is not a power of 2\n";
errors++;
}
}
}
unsigned bytesPerElem = 0;
tag = "max_bytes_per_elem";
if (not vconf.count(tag))
{
std::cerr << "Error: Missing " << tag << " tag in vector section of config file\n";
errors++;
}
else
{
if (not getJsonUnsigned(tag, vconf.at(tag), bytesPerElem))
errors++;
else if (bytesPerElem == 0 or bytesPerElem > bytesPerVec)
{
std::cerr << "Error: Invalid config file max_bytes_per_elem number: "
<< bytesPerElem << '\n';
errors++;
}
else
{
unsigned l2BytesPerElem = std::log2(bytesPerElem);
unsigned p2BytesPerElem = uint32_t(1) << l2BytesPerElem;
if (p2BytesPerElem != bytesPerElem)
{
std::cerr << "Error: Config file max_bytes_per_elem ("
<< bytesPerElem << ") is not a power of 2\n";
errors++;
}
}
}
if (errors == 0)
hart.configVector(bytesPerVec, bytesPerElem);
return errors == 0;
}
template <typename URV>
static
bool
applyInstMemConfig(Hart<URV>& hart, const nlohmann::json& config)
{
using std::cerr;
if (not config.is_array())
{
cerr << "Invalid inst entry in config file memmap (execpting an array)\n";
return false;
}
// Pairs of addresses in which inst fetch is allowed.
std::vector<std::pair<URV,URV>> windows;
unsigned errors = 0;
unsigned ix = 0;
for (auto it = config.begin(); it != config.end(); ++it, ++ix)
{
const auto& addrPair = *it;
if (not addrPair.is_array() or addrPair.size() != 2)
{
cerr << "Invalid address range in config file memap inst ("
<< "expecting an array of 2 numbers at index " << ix << ")\n";
++errors;
break;
}
std::vector<URV> vec;
if (not getJsonUnsignedVec("memmap.inst", addrPair, vec))
errors++;
else if (vec.size() != 2)
errors++;
else
{
auto p = std::make_pair(vec.at(0), vec.at(1));
windows.push_back(p);
}
}
if (not errors and not windows.empty())
if (not hart.configMemoryFetch(windows))
errors++;
return errors == 0;
}
template <typename URV>
static
bool
applyDataMemConfig(Hart<URV>& hart, const nlohmann::json& config)
{
using std::cerr;
if (not config.is_array())
{
cerr << "Invalid data entry in config file memmap (execpting an array)\n";
return false;
}
// Pairs of addresses in which data access is allowed.
std::vector<std::pair<URV,URV>> windows;
unsigned errors = 0;
unsigned ix = 0;
for (auto it = config.begin(); it != config.end(); ++it, ++ix)
{
const auto& addrPair = *it;
if (not addrPair.is_array() or addrPair.size() != 2)
{
cerr << "Invalid address range in config file memap data ("
<< "expecting an array of 2 numbers at index " << ix << ")\n";
++errors;
break;
}
std::vector<URV> vec;
if (not getJsonUnsignedVec("memmap.data", addrPair, vec))
errors++;
if (vec.size() != 2)
errors++;
else
{
auto p = std::make_pair(vec.at(0), vec.at(1));
windows.push_back(p);
}
}
if (not errors and not windows.empty())
if (not hart.configMemoryDataAccess(windows))
errors++;
return errors == 0;
}
template<typename URV>
bool
HartConfig::applyMemoryConfig(Hart<URV>& hart, bool iccmRw, bool /*verbose*/) const
{
unsigned errors = 0;
if (not applyIccmConfig(hart, *config_))
errors++;
if (not applyDccmConfig(hart, *config_))
errors++;
if (not applyMemMappedRegConfig(hart, *config_))
errors++;
if (config_ -> count("iccmrw"))
if (not getJsonBoolean("iccmrw", config_ ->at("iccmrw"), iccmRw))
errors++;
hart.finishCcmConfig(iccmRw);
if (config_ -> count("memmap"))
{
// Apply memory protection windows.
const auto& memmap = config_ -> at("memmap");
std::string tag = "inst";
if (memmap.count(tag))
if (not applyInstMemConfig(hart, memmap.at(tag)))
errors++;
tag = "data";
if (memmap.count(tag))
if (not applyDataMemConfig(hart, memmap.at(tag)))
errors++;
}
return errors == 0;
}
template<typename URV>
bool
HartConfig::applyConfig(Hart<URV>& hart, bool userMode, bool verbose) const
{
unsigned errors = 0;
// Define PC value after reset.
std::string tag = "reset_vec";
if (config_ -> count(tag))
{
URV resetPc = 0;
if (getJsonUnsigned(tag, config_ -> at(tag), resetPc))
hart.defineResetPc(resetPc);
else
errors++;
}
// Define non-maskable-interrupt pc
tag = "nmi_vec";
if (config_ -> count(tag))
{
URV nmiPc = 0;
if (getJsonUnsigned(tag, config_ -> at(tag), nmiPc))
hart.defineNmiPc(nmiPc);
else
errors++;
}
// Use ABI register names (e.g. sp instead of x2).
tag = "abi_names";
if (config_ -> count(tag))
{
bool abiNames = false;
if (getJsonBoolean(tag, config_ -> at(tag), abiNames))
hart.enableAbiNames(abiNames);
else
errors++;
}
// Atomic instructions illegal outside of DCCM.
tag = "amo_illegal_outside_dccm";
if (config_ -> count(tag))
{
bool flag = false;
if (getJsonBoolean(tag, config_ ->at(tag), flag))
hart.setAmoInDccmOnly(flag);
else
errors++;
}