PySysC-SC/components/router.h

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#ifndef ROUTER_H
#define ROUTER_H
#include "systemc"
using namespace sc_core;
using namespace sc_dt;
using namespace std;
#include "tlm.h"
#include "tlm_utils/simple_initiator_socket.h"
#include "tlm_utils/simple_target_socket.h"
// *********************************************
// Generic payload blocking transport router
// *********************************************
template<unsigned int N_TARGETS>
struct Router: sc_module
{
// TLM-2 socket, defaults to 32-bits wide, base protocol
tlm_utils::simple_target_socket<Router> target_socket;
// *********************************************
// Use tagged sockets to be able to distinguish incoming backward path calls
// *********************************************
sc_core::sc_vector<tlm_utils::simple_initiator_socket_tagged<Router>> initiator_socket;
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sc_core::sc_in<sc_core::sc_time> clk_i;
sc_core::sc_in<sc_dt::sc_logic> reset_i;
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SC_CTOR(Router)
: target_socket("target_socket")
, initiator_socket("socket", N_TARGETS)
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, clk_i("clk_i")
, reset_i("reset_i")
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{
// Register callbacks for incoming interface method calls
target_socket.register_b_transport( this, &Router::b_transport);
target_socket.register_get_direct_mem_ptr(this, &Router::get_direct_mem_ptr);
target_socket.register_transport_dbg( this, &Router::transport_dbg);
for (unsigned int i = 0; i < N_TARGETS; i++)
{
char txt[20];
sprintf(txt, "socket_%d", i);
// *********************************************
// Register callbacks for incoming interface method calls, including tags
// *********************************************
initiator_socket[i].register_invalidate_direct_mem_ptr(this, &Router::invalidate_direct_mem_ptr, i);
}
}
// ****************
// FORWARD PATH
// ****************
// TLM-2 blocking transport method
virtual void b_transport( tlm::tlm_generic_payload& trans, sc_time& delay )
{
sc_dt::uint64 address = trans.get_address();
sc_dt::uint64 masked_address;
unsigned int target_nr = decode_address( address, masked_address);
// Modify address within transaction
trans.set_address( masked_address );
// Forward transaction to appropriate target
initiator_socket[target_nr]->b_transport( trans, delay );
}
// TLM-2 forward DMI method
virtual bool get_direct_mem_ptr(tlm::tlm_generic_payload& trans,
tlm::tlm_dmi& dmi_data)
{
sc_dt::uint64 masked_address;
unsigned int target_nr = decode_address( trans.get_address(), masked_address );
trans.set_address( masked_address );
bool status = initiator_socket[target_nr]->get_direct_mem_ptr( trans, dmi_data );
// Calculate DMI address of target in system address space
dmi_data.set_start_address( compose_address( target_nr, dmi_data.get_start_address() ));
dmi_data.set_end_address ( compose_address( target_nr, dmi_data.get_end_address() ));
return status;
}
// TLM-2 debug transaction method
virtual unsigned int transport_dbg(tlm::tlm_generic_payload& trans)
{
sc_dt::uint64 masked_address;
unsigned int target_nr = decode_address( trans.get_address(), masked_address );
trans.set_address( masked_address );
// Forward debug transaction to appropriate target
return initiator_socket[target_nr]->transport_dbg( trans );
}
// ****************
// BACKWARD PATH
// ****************
// **************************
// Tagged backward DMI method
// **************************
virtual void invalidate_direct_mem_ptr(int id,
sc_dt::uint64 start_range,
sc_dt::uint64 end_range)
{
// Reconstruct address range in system memory map
sc_dt::uint64 bw_start_range = compose_address( id, start_range );
sc_dt::uint64 bw_end_range = compose_address( id, end_range );
target_socket->invalidate_direct_mem_ptr(bw_start_range, bw_end_range);
}
// ****************
// ROUTER INTERNALS
// ****************
// Simple fixed address decoding
inline unsigned int decode_address( sc_dt::uint64 address, sc_dt::uint64& masked_address )
{
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unsigned int target_nr = static_cast<unsigned int>( (address >> 10) % initiator_socket.size() );
masked_address = address & 0x3FF;
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return target_nr;
}
inline sc_dt::uint64 compose_address( unsigned int target_nr, sc_dt::uint64 address)
{
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return (target_nr << 10) | (address & 0x3FF);
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}
};
#endif