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systemc: Implement a significant portion of sc_clock.

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Change-Id: Ic195f46ac13b46a02c86a5fc8d90ba66a415a9c8
Reviewed-on: https://gem5-review.googlesource.com/12215
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
This commit is contained in:
Gabe Black
2018-08-16 19:10:09 -07:00
parent 440b143742
commit df50b775cb
2 changed files with 122 additions and 55 deletions
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155
src/systemc/channel/sc_clock.cc
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@@ -28,84 +28,121 @@
*/
#include "base/logging.hh"
#include "base/types.hh"
#include "sim/core.hh"
#include "sim/eventq.hh"
#include "systemc/core/kernel.hh"
#include "systemc/core/sched_event.hh"
#include "systemc/core/scheduler.hh"
#include "systemc/ext/channel/sc_clock.hh"
#include "systemc/ext/core/sc_module.hh" // for sc_gen_unique_name
namespace sc_gem5
{
class ClockTick : public ScEvent
{
private:
::sc_core::sc_clock *clock;
::sc_core::sc_time _period;
std::string _name;
Process *p;
ProcessMemberFuncWrapper<::sc_core::sc_clock> funcWrapper;
std::string _procName;
public:
ClockTick(::sc_core::sc_clock *clock, bool to,
::sc_core::sc_time _period) :
ScEvent([this]() { tick(); }),
clock(clock), _period(_period), _name(clock->name()),
funcWrapper(clock, to ? &::sc_core::sc_clock::tickUp :
&::sc_core::sc_clock::tickDown)
{
_name += (to ? ".up_tick" : ".down_tick");
_procName = _name + ".p";
p = newMethodProcess(_procName.c_str(), &funcWrapper);
scheduler.dontInitialize(p);
}
~ClockTick()
{
if (scheduled())
scheduler.deschedule(this);
p->popListNode();
}
void
tick()
{
scheduler.schedule(this, _period);
p->ready();
}
};
};
namespace sc_core
{
sc_clock::sc_clock() :
sc_interface(), sc_signal<bool>(sc_gen_unique_name("clock"))
{
warn("%s not implemented.\n", __PRETTY_FUNCTION__);
}
sc_clock(sc_gen_unique_name("clock"), sc_time(1.0, SC_NS),
0.5, SC_ZERO_TIME, true)
{}
sc_clock::sc_clock(const char *name) : sc_interface(), sc_signal<bool>(name)
{
warn("%s not implemented.\n", __PRETTY_FUNCTION__);
}
sc_clock::sc_clock(const char *name) :
sc_clock(name, sc_time(1.0, SC_NS), 0.5, SC_ZERO_TIME, true)
{}
sc_clock::sc_clock(const char *name, const sc_time &period,
double duty_cycle, const sc_time &start_time,
bool posedge_first)
bool posedge_first) :
sc_interface(), sc_signal<bool>(name, posedge_first ? false : true),
_period(period), _dutyCycle(duty_cycle), _startTime(start_time),
_posedgeFirst(posedge_first)
{
warn("%s not implemented.\n", __PRETTY_FUNCTION__);
_gem5UpEdge = new ::sc_gem5::ClockTick(this, true, period);
_gem5DownEdge = new ::sc_gem5::ClockTick(this, false, period);
}
sc_clock::sc_clock(const char *name, double period_v, sc_time_unit period_tu,
double duty_cycle)
{
warn("%s not implemented.\n", __PRETTY_FUNCTION__);
}
double duty_cycle) :
sc_clock(name, sc_time(period_v, period_tu), duty_cycle, SC_ZERO_TIME,
true)
{}
sc_clock::sc_clock(const char *name, double period_v, sc_time_unit period_tu,
double duty_cycle, double start_time_v,
sc_time_unit start_time_tu, bool posedge_first)
{
warn("%s not implemented.\n", __PRETTY_FUNCTION__);
}
sc_time_unit start_time_tu, bool posedge_first) :
sc_clock(name, sc_time(period_v, period_tu), duty_cycle,
sc_time(start_time_v, start_time_tu), posedge_first)
{}
sc_clock::sc_clock(const char *name, double period, double duty_cycle,
double start_time, bool posedge_first)
{
warn("%s not implemented.\n", __PRETTY_FUNCTION__);
}
double start_time, bool posedge_first) :
sc_clock(name, sc_time(period, true), duty_cycle,
sc_time(start_time, true), posedge_first)
{}
sc_clock::~sc_clock() {}
sc_clock::~sc_clock()
{
if (_gem5UpEdge->scheduled())
::sc_gem5::scheduler.deschedule(_gem5UpEdge);
if (_gem5DownEdge->scheduled())
::sc_gem5::scheduler.deschedule(_gem5DownEdge);
delete _gem5UpEdge;
delete _gem5DownEdge;
}
void
sc_clock::write(const bool &)
{
warn("%s not implemented.\n", __PRETTY_FUNCTION__);
panic("write() called on sc_clock.");
}
const sc_time &
sc_clock::period() const
{
warn("%s not implemented.\n", __PRETTY_FUNCTION__);
return *(const sc_time *)nullptr;
}
double
sc_clock::duty_cycle() const
{
warn("%s not implemented.\n", __PRETTY_FUNCTION__);
return 0.0;
}
const sc_time &
sc_clock::start_time() const
{
warn("%s not implemented.\n", __PRETTY_FUNCTION__);
return *(const sc_time *)nullptr;
}
bool
sc_clock::posedge_first() const
{
warn("%s not implemented.\n", __PRETTY_FUNCTION__);
return false;
}
const sc_time &sc_clock::period() const { return _period; }
double sc_clock::duty_cycle() const { return _dutyCycle; }
const sc_time &sc_clock::start_time() const { return _startTime; }
bool sc_clock::posedge_first() const { return _posedgeFirst; }
const sc_time &
sc_clock::time_stamp()
@@ -114,8 +151,18 @@ sc_clock::time_stamp()
return *(const sc_time *)nullptr;
}
const char *sc_clock::kind() const { return "sc_clock"; }
void sc_clock::before_end_of_elaboration() {}
void
sc_clock::before_end_of_elaboration()
{
if (_posedgeFirst) {
::sc_gem5::scheduler.schedule(_gem5UpEdge, _startTime);
::sc_gem5::scheduler.schedule(_gem5DownEdge,
_startTime + _period * _dutyCycle);
} else {
::sc_gem5::scheduler.schedule(_gem5DownEdge, _startTime);
::sc_gem5::scheduler.schedule(_gem5UpEdge,
_startTime + _period * (1.0 - _dutyCycle));
}
}
} // namespace sc_core

22
src/systemc/ext/channel/sc_clock.hh
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@@ -33,6 +33,13 @@
#include "../core/sc_time.hh"
#include "sc_signal.hh"
namespace sc_gem5
{
class ClockTick;
} // namespace sc_gem5
namespace sc_core
{
@@ -74,15 +81,28 @@ class sc_clock : public sc_signal<bool>
// Nonstandard
static const sc_time &time_stamp();
virtual const char *kind() const;
virtual const char *kind() const { return "sc_clock"; }
protected:
virtual void before_end_of_elaboration();
private:
friend class ::sc_gem5::ClockTick;
// Disabled
sc_clock(const sc_clock &) : sc_interface(), sc_signal<bool>() {}
sc_clock &operator = (const sc_clock &) { return *this; }
sc_time _period;
double _dutyCycle;
sc_time _startTime;
bool _posedgeFirst;
::sc_gem5::ClockTick *_gem5UpEdge;
::sc_gem5::ClockTick *_gem5DownEdge;
void tickUp() { sc_signal<bool>::write(true); }
void tickDown() { sc_signal<bool>::write(false); }
};
typedef sc_in<bool> sc_in_clk;