/* * Copyright 2018 Google, Inc. * * 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, * 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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * Authors: Gabe Black */ #include #include "base/logging.hh" #include "base/types.hh" #include "python/pybind11/pybind.hh" #include "systemc/core/python.hh" #include "systemc/ext/core/sc_time.hh" namespace sc_core { namespace { const char *TimeUnitNames[] = { [SC_FS] = "fs", [SC_PS] = "ps", [SC_NS] = "ns", [SC_US] = "us", [SC_MS] = "ms", [SC_SEC] = "s" }; double TimeUnitScale[] = { [SC_FS] = 1.0e-15, [SC_PS] = 1.0e-12, [SC_NS] = 1.0e-9, [SC_US] = 1.0e-6, [SC_MS] = 1.0e-3, [SC_SEC] = 1.0 }; bool timeFixed = false; bool pythonReady = false; struct SetInfo { SetInfo(::sc_core::sc_time *time, double d, ::sc_core::sc_time_unit tu) : time(time), d(d), tu(tu) {} ::sc_core::sc_time *time; double d; ::sc_core::sc_time_unit tu; }; std::vector toSet; void setWork(sc_time *time, double d, ::sc_core::sc_time_unit tu) { //XXX Assuming the time resolution is 1ps. double scale = TimeUnitScale[tu] / TimeUnitScale[SC_PS]; // Accellera claims there is a linux bug, and that these next two // lines work around them. volatile double tmp = d * scale + 0.5; *time = sc_time::from_value(static_cast(tmp)); } void fixTime() { auto ticks = pybind11::module::import("m5.ticks"); auto fix_global_frequency = ticks.attr("fixGlobalFrequency"); fix_global_frequency(); for (auto &t: toSet) setWork(t.time, t.d, t.tu); toSet.clear(); } void set(::sc_core::sc_time *time, double d, ::sc_core::sc_time_unit tu) { // Only fix time once. if (!timeFixed) { timeFixed = true; // If we've run, python is working and we haven't fixed time yet. if (pythonReady) fixTime(); } if (pythonReady) { // Time should be working. Set up this sc_time. setWork(time, d, tu); } else { // Time isn't set up yet. Defer setting up this sc_time. toSet.emplace_back(time, d, tu); } } class TimeSetter : public ::sc_gem5::PythonReadyFunc { public: TimeSetter() : ::sc_gem5::PythonReadyFunc() {} void run() override { // Record that we've run and python/pybind should be usable. pythonReady = true; // If time is already fixed, let python know. if (timeFixed) fixTime(); } } timeSetter; } // anonymous namespace sc_time::sc_time() : val(0) {} sc_time::sc_time(double d, sc_time_unit tu) { val = 0; if (d != 0) set(this, d, tu); } sc_time::sc_time(const sc_time &t) { val = t.val; } sc_time::sc_time(double, bool) { warn("%s not implemented.\n", __PRETTY_FUNCTION__); } sc_time::sc_time(sc_dt::uint64, bool) { warn("%s not implemented.\n", __PRETTY_FUNCTION__); } sc_time & sc_time::operator = (const sc_time &t) { val = t.val; return *this; } sc_dt::uint64 sc_time::value() const { return val; } double sc_time::to_double() const { return static_cast(val); } double sc_time::to_seconds() const { warn("%s not implemented.\n", __PRETTY_FUNCTION__); return 0.0; } const std::string sc_time::to_string() const { warn("%s not implemented.\n", __PRETTY_FUNCTION__); return ""; } bool sc_time::operator == (const sc_time &t) const { return val == t.val; } bool sc_time::operator != (const sc_time &t) const { return val != t.val; } bool sc_time::operator < (const sc_time &t) const { return val < t.val; } bool sc_time::operator <= (const sc_time &t) const { return val <= t.val; } bool sc_time::operator > (const sc_time &t) const { return val > t.val; } bool sc_time::operator >= (const sc_time &t) const { return val >= t.val; } sc_time & sc_time::operator += (const sc_time &t) { val += t.val; return *this; } sc_time & sc_time::operator -= (const sc_time &t) { val -= t.val; return *this; } sc_time & sc_time::operator *= (double d) { val = static_cast(static_cast(val) * d + 0.5); return *this; } sc_time & sc_time::operator /= (double d) { val = static_cast(static_cast(val) / d + 0.5); return *this; } void sc_time::print(std::ostream &os) const { if (val == 0) { os << "0 s"; } else { //XXX Assuming the time resolution is 1ps. sc_time_unit tu = SC_PS; uint64_t scaled = val; while (tu < SC_SEC && (scaled % 1000) == 0) { tu = (sc_time_unit)((int)tu + 1); scaled /= 1000; } os << scaled << ' ' << TimeUnitNames[tu]; } } sc_time sc_time::from_value(sc_dt::uint64 u) { sc_time t; t.val = u; return t; } sc_time sc_time::from_seconds(double) { warn("%s not implemented.\n", __PRETTY_FUNCTION__); return sc_time(); } sc_time sc_time::from_string(const char *str) { warn("%s not implemented.\n", __PRETTY_FUNCTION__); return sc_time(); } const sc_time operator + (const sc_time &a, const sc_time &b) { return sc_time::from_value(a.value() + b.value()); } const sc_time operator - (const sc_time &a, const sc_time &b) { return sc_time::from_value(a.value() - b.value()); } const sc_time operator * (const sc_time &t, double d) { volatile double tmp = static_cast(t.value()) * d + 0.5; return sc_time::from_value(static_cast(tmp)); } const sc_time operator * (double d, const sc_time &t) { volatile double tmp = d * static_cast(t.value()) + 0.5; return sc_time::from_value(static_cast(tmp)); } const sc_time operator / (const sc_time &t, double d) { volatile double tmp = static_cast(t.value()) / d + 0.5; return sc_time::from_value(static_cast(tmp)); } double operator / (const sc_time &t1, const sc_time &t2) { return t1.to_double() / t2.to_double(); } std::ostream & operator << (std::ostream &os, const sc_time &t) { t.print(os); return os; } const sc_time SC_ZERO_TIME; void sc_set_time_resolution(double, sc_time_unit) { warn("%s not implemented.\n", __PRETTY_FUNCTION__); } sc_time sc_get_time_resolution() { warn("%s not implemented.\n", __PRETTY_FUNCTION__); return sc_time(); } const sc_time & sc_max_time() { static const sc_time MaxScTime = sc_time::from_value(MaxTick); return MaxScTime; } void sc_set_default_time_unit(double, sc_time_unit) { warn("%s not implemented.\n", __PRETTY_FUNCTION__); } sc_time sc_get_default_time_unit() { warn("%s not implemented.\n", __PRETTY_FUNCTION__); return *(sc_time *)nullptr; } sc_time_tuple::sc_time_tuple(const sc_time &) { warn("%s not implemented.\n", __PRETTY_FUNCTION__); } bool sc_time_tuple::has_value() const { warn("%s not implemented.\n", __PRETTY_FUNCTION__); return false; } sc_dt::uint64 sc_time_tuple::value() const { warn("%s not implemented.\n", __PRETTY_FUNCTION__); return 0; } const char * sc_time_tuple::unit_symbol() const { warn("%s not implemented.\n", __PRETTY_FUNCTION__); return ""; } double sc_time_tuple::to_double() const { warn("%s not implemented.\n", __PRETTY_FUNCTION__); return 0.0; } std::string sc_time_tuple::to_string() const { warn("%s not implemented.\n", __PRETTY_FUNCTION__); return ""; } } // namespace sc_core