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HartConfig.cpp
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//
// SPDX-License-Identifier: GPL-3.0-or-later
// Copyright 2018 Western Digital Corporation or its affiliates.
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along with
// this program. If not, see <https://www.gnu.org/licenses/>.
//
#include <nlohmann/json.hpp>
#include <fstream>
#include <iostream>
#include "HartConfig.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 value to an unsigned integer honoring
/// hexadecimal prefix (0x) if any.
template <typename URV>
URV
getJsonUnsigned(const std::string& tag, const nlohmann::json& js)
{
if (js.is_number())
return js.get<URV>();
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';
URV val = static_cast<URV>(u64);
if (val != u64)
std::cerr << "Overflow in config file value for '" << tag << "': "
<< str << '\n';
return val;
}
std::cerr << "Config file entry '" << tag << "' must contain a number\n";
return 0;
}
/// Convert given json array value to an vector of unsigned integers
/// honoring any hexadecimal prefix (0x) if any.
template <typename URV>
std::vector<URV>
getJsonUnsignedVec(const std::string& tag, const nlohmann::json& js)
{
std::vector<URV> vec;
if (not js.is_array())
{
std::cerr << "Invalid config file value for '" << tag << "'"
<< " -- expecting array of numbers\n";
return vec;
}
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';
continue;
}
URV val = static_cast<URV>(u64);
if (val != u64)
std::cerr << "Overflow in config file value for '" << tag << "': "
<< str << '\n';
vec.push_back(val);
}
else
std::cerr << "Invalid config file value for '" << tag << "'"
<< " -- expecting array of number\n";
}
return vec;
}
/// Convert given json value to a boolean.
bool
getJsonBoolean(const std::string& tag, const nlohmann::json& js)
{
if (js.is_boolean())
return js.get<bool>();
if (js.is_number())
return js.get<unsigned>();
if (js.is_string())
{
std::string str = js.get<std::string>();
if (str == "0" or str == "false" or str == "False")
return false;
if (str == "1" or str == "true" or str == "True")
return true;
std::cerr << "Invalid config file value for '" << tag << "': "
<< str << '\n';
return false;
}
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"))
reset = getJsonUnsigned<URV>(csrName + ".reset", conf.at("reset"));
if (conf.count("mask"))
{
mask = getJsonUnsigned<URV>(csrName + ".mask", conf.at("mask"));
// 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"))
pokeMask = getJsonUnsigned<URV>(csrName + ".poke_mask",
conf.at("poke_mask"));
if (conf.count("debug"))
isDebug = getJsonBoolean(csrName + ".bool", conf.at("debug"));
if (conf.count("exists"))
exists = getJsonBoolean(csrName + ".bool", conf.at("exists"));
if (conf.count("shared"))
shared = getJsonBoolean(csrName + ".bool", conf.at("shared"));
// If number present and csr is not defined, then define a new
// CSR; otherwise, configure.
if (conf.count("number"))
{
unsigned number = getJsonUnsigned<unsigned>(csrName + ".number",
conf.at("number"));
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.localHartId() == 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";
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
applyPicConfig(Hart<URV>& hart, const nlohmann::json& config)
{
if (not config.count("pic"))
return true; // Nothing to apply.
const auto& pic = config.at("pic");
for (const auto& tag : { "region", "size", "offset", "mpiccfg_offset",
"meipl_offset", "meip_offset", "meie_offset", "meigwctrl_offset",
"meigwclr_offset", "total_int", "int_words" } )
{
if (not pic.count(tag))
{
std::cerr << "Missing '" << tag << "' entry in "
<< "config file PIC section\n";
}
}
// Define pic region.
uint64_t region = getJsonUnsigned<URV>("region", pic.at("region"));
uint64_t size = getJsonUnsigned<URV>("size", pic.at("size"));
uint64_t regionOffset = getJsonUnsigned<URV>("offset", pic.at("offset"));
if (not hart.defineMemoryMappedRegisterRegion(region, regionOffset, size))
return false;
// Define the memory mapped registers.
uint64_t smax = getJsonUnsigned<URV>("pic.total_int", pic.at("total_int"));
uint64_t xmax = getJsonUnsigned<URV>("pic.int_words", pic.at("int_words"));
unsigned errors = 0;
// Start by giving all registers in region a mask of zero.
size_t possibleRegCount = size / 4;
for (size_t ix = 0; ix < possibleRegCount; ++ix)
hart.defineMemoryMappedRegisterWriteMask(region, regionOffset, 0, ix, 0);
std::vector<std::string> names = { "mpiccfg_offset", "meipl_offset",
"meip_offset", "meie_offset",
"meigwctrl_offset", "meigwclr_offset" };
// These should be in the config file. The mask for meigwclr is zero
// because the state is always zero.
std::vector<uint32_t> masks = { 1, 0xf, 0, 1, 3, 0 };
std::vector<size_t> counts = { 1, smax, xmax, smax, smax, smax };
// meipl, meie, meigwctrl and meigwclr indexing start at 1 (instead
// of 0): adjust
std::vector<size_t> adjust = { 0, 4, 0, 4, 4, 4 };
for (size_t i = 0; i < names.size(); ++i)
{
auto mask = masks.at(i);
const auto& name = names.at(i);
auto count = counts.at(i);
if (not pic.count(name))
continue; // Should be an error.
uint64_t registerOffset = getJsonUnsigned<URV>(("pic." + name),
pic.at(name));
registerOffset += adjust.at(i);
for (size_t regIx = 0; regIx < count; ++regIx)
if (not hart.defineMemoryMappedRegisterWriteMask(region, regionOffset,
registerOffset, regIx,
mask))
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 = getJsonUnsigned<URV>("iccm.region", iccm.at("region"));
size_t size = getJsonUnsigned<URV>("iccm.size", iccm.at("size"));
size_t offset = getJsonUnsigned<URV>("iccm.offset", iccm.at("offset"));
return hart.defineIccm(region, offset, size);
}
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 = getJsonUnsigned<URV>("dccm.region", dccm.at("region"));
size_t size = getJsonUnsigned<URV>("dccm.size", dccm.at("size"));
size_t offset = getJsonUnsigned<URV>("dccm.offset", dccm.at("offset"));
return hart.defineDccm(region, offset, size);
}
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;
}
auto resets = getJsonUnsignedVec<URV>(name + ".reset", trig.at("reset"));
auto masks = getJsonUnsignedVec<URV>(name + ".mask", trig.at("mask"));
auto pokeMasks = getJsonUnsignedVec<URV>(name + ".poke_mask",
trig.at("poke_mask"));
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
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;
}
auto vec = getJsonUnsignedVec<URV>("memmap.inst", addrPair);
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;
}
auto vec = getJsonUnsignedVec<URV>("memmap.data", addrPair);
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 /*verbose*/) const
{
unsigned errors = 0;
if (not applyIccmConfig(hart, *config_))
errors++;
if (not applyDccmConfig(hart, *config_))
errors++;
if (not applyPicConfig(hart, *config_))
errors++;
hart.finishCcmConfig();
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 verbose) const
{
// Define PC value after reset.
std::string tag = "reset_vec";
if (config_ -> count(tag))
{
URV resetPc = getJsonUnsigned<URV>(tag, config_ -> at(tag));
hart.defineResetPc(resetPc);
}
// Define non-maskable-interrupt pc
tag = "nmi_vec";
if (config_ -> count(tag))
{
URV nmiPc = getJsonUnsigned<URV>(tag, config_ -> at(tag));
hart.defineNmiPc(nmiPc);
}
// Use ABI register names (e.g. sp instead of x2).
tag = "abi_names";
if (config_ -> count(tag))
{
bool abiNames = getJsonBoolean(tag, config_ ->at(tag));
hart.enableAbiNames(abiNames);
}
// Atomic instructions illegal outside of DCCM.
tag = "amo_illegal_outside_dccm";
if (config_ -> count(tag))
{
bool flag = getJsonBoolean(tag, config_ ->at(tag));
hart.setAmoIllegalOutsideDccm(flag);
}
// Ld/st instructions trigger misaligned exception if base address
// (value in rs1) and effective address refer to regions of
// different types.
tag = "effective_address_compatible_with_base";
if (config_ -> count(tag))
{
bool flag = getJsonBoolean(tag, config_ ->at(tag));
hart.setEaCompatibleWithBase(flag);
}
// Enable debug triggers.
tag ="enable_triggers";
if (config_ -> count(tag))
{
bool et = getJsonBoolean(tag, config_ ->at(tag));
hart.enableTriggers(et);
}
// Enable performance counters.
tag ="enable_performance_counters";
if (config_ -> count(tag))
{
bool epc = getJsonBoolean(tag, config_ ->at(tag));
hart.enablePerformanceCounters(epc);
}
// Enable rollback of memory on store error.
tag = "store_error_rollback";
if (config_ -> count(tag))
{
bool ser = getJsonBoolean(tag, config_ -> at(tag));
hart.enableStoreErrorRollback(ser);
}
// Enable rollback of register on load error.
tag = "load_error_rollback";
if (config_ -> count(tag))
{
bool ler = getJsonBoolean(tag, config_ -> at(tag));
hart.enableLoadErrorRollback(ler);
}
// Enable fast interrupts.
tag = "fast_interrupt_redirect";
if (config_ -> count(tag))
{
bool flag = getJsonBoolean(tag, config_ -> at(tag));
hart.enableFastInterrupts(flag);
}
// Enable zbb.
tag = "enable_zbmini";
if (config_ -> count(tag))
{
std::cerr << "Config file tag \"enable_zbmini\" deprecated: "
<< "Using \"enable_zbb\" and \"enable_zbs\"\n";
bool flag = getJsonBoolean(tag, config_ -> at(tag));
hart.enableRvzbb(flag);
hart.enableRvzbs(flag);
}
tag = "enable_zbb";
if (config_ -> count(tag))
{
bool flag = getJsonBoolean(tag, config_ -> at(tag));
hart.enableRvzbb(flag);
}
tag = "enable_zbs";
if (config_ -> count(tag))
{
bool flag = getJsonBoolean(tag, config_ -> at(tag));
hart.enableRvzbs(flag);
}
tag = "load_queue_size";
if (config_ -> count(tag))
{
unsigned lqs = getJsonUnsigned<unsigned>(tag, config_ -> at(tag));
if (lqs > 64)
{
std::cerr << "Config file load queue size (" << lqs << ") too large"
<< " -- using 64.\n";
lqs = 64;
}
hart.setLoadQueueSize(lqs);
}
tag = "even_odd_trigger_chains";
if (config_ -> count(tag))
{
bool chainPairs = getJsonBoolean(tag, config_ -> at(tag));
hart.configEvenOddTriggerChaining(chainPairs);
}
unsigned errors = 0;
tag = "num_mmode_perf_regs";
if (config_ -> count(tag))
{
unsigned count = getJsonUnsigned<unsigned>(tag, config_ -> at(tag));
if (not hart.configMachineModePerfCounters(count))
errors++;
}
tag = "max_mmode_perf_event";
if (config_ -> count(tag))
{
unsigned maxId = getJsonUnsigned<unsigned>(tag, config_ -> at(tag));
hart.configMachineModeMaxPerfEvent(maxId);
}
if (not applyCsrConfig(hart, *config_, verbose))
errors++;
if (not applyTriggerConfig(hart, *config_))
errors++;
if (config_ -> count("memmap"))
{
const auto& memmap = config_ -> at("memmap");
tag = "consoleio";
if (memmap.count(tag))
{
URV io = getJsonUnsigned<URV>("memmap.consoleio", memmap.at(tag));
hart.setConsoleIo(io);
}
}
return errors == 0;
}
bool
HartConfig::getXlen(unsigned& xlen) const
{
if (config_ -> count("xlen"))
{
xlen = getJsonUnsigned<uint32_t>("xlen", config_ -> at("xlen"));
return true;
}
return false;
}
bool
HartConfig::getPageSize(size_t& pageSize) const
{
if (not config_ -> count("memmap"))
return false;
auto& mem = config_ -> at("memmap");
if (not mem.count("page_size"))
return false;
pageSize = getJsonUnsigned<size_t>("memmap.page_size", mem.at("page_size"));
return true;
}
bool
HartConfig::getMemorySize(size_t& memSize) const
{
if (not config_ -> count("memmap"))
return false;
auto& mem = config_ -> at("memmap");
if (not mem.count("size"))
return false;
memSize = getJsonUnsigned<size_t>("memmap.size", mem.at("size"));
return true;
}
void
HartConfig::clear()
{
config_ -> clear();
}
/// Associate callbacks with write/poke of mhartstart to start harts
/// when corresponding bits are set in that CSR.
template <typename URV>
void
defineMhartstartSideEffects(std::vector<Hart<URV>*>& harts)
{
for (auto hart : harts)
{
auto csrPtr = hart->findCsr("mhartstart");
if (not csrPtr)
continue;
auto csrNum = csrPtr->getNumber();
auto post = [&harts] (Csr<URV>&, URV val) -> void {
// Start harts corresponding to set bits
for (auto ht : harts)
{
URV id = ht->localHartId();
if (val & (URV(1) << id))
ht->setStarted(true);
}
};
auto pre = [&harts, csrNum] (Csr<URV>&, URV& val) -> void {
// Implement write one semantics.
URV prev = 0;
harts.at(0)->peekCsr(csrNum, prev);
val |= prev;
};
csrPtr->registerPostPoke(post);
csrPtr->registerPostWrite(post);
csrPtr->registerPrePoke(pre);
csrPtr->registerPreWrite(pre);
}
}
/// Associate callback with write/poke of mnmipdel to deletage
/// non-maskable-interrupts to harts.
template <typename URV>
void
defineMnmipdelSideEffects(std::vector<Hart<URV>*>& harts)
{
for (auto hart : harts)
{
auto csrPtr = hart->findCsr("mnmipdel");
if (not csrPtr)
continue;
// Enable NMI for harts corresponding to set bits in mnmipdel.
auto post = [&harts] (Csr<URV>& csr, URV val) -> void {
if ((val & csr.getWriteMask()) == 0)
return;
for (auto ht : harts)
{
URV id = ht->localHartId();
bool enable = (val & (URV(1) << id)) != 0;
ht->enableNmi(enable);
}
};
// If an attempt to change writeable bits to all-zero, keep
// previous value.
auto pre = [&harts] (Csr<URV>& csr, URV& val) -> void {
URV prev = csr.read();
if ((val & csr.getWriteMask()) == 0)
val = prev;
};
// On reset, enable NMI in harts according to the bits of mnmipdel