risc-v-tlm/src/Memory.cpp

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2018-09-11 00:44:54 +08:00
#include "Memory.h"
SC_HAS_PROCESS(Memory);
Memory::Memory(sc_module_name name, string filename): sc_module(name)
,socket("socket")
,LATENCY(SC_ZERO_TIME) {
// Register callbacks for incoming interface method calls
socket.register_b_transport( this, &Memory::b_transport);
socket.register_get_direct_mem_ptr(this, &Memory::get_direct_mem_ptr);
socket.register_transport_dbg( this, &Memory::transport_dbg);
memset(mem, 0, SIZE*sizeof(int));
// readCustomHexFile("memory.hex");
readHexFile(filename);
SC_THREAD(invalidation_process);
}
void Memory::b_transport( tlm::tlm_generic_payload& trans, sc_time& delay )
{
tlm::tlm_command cmd = trans.get_command();
sc_dt::uint64 adr = trans.get_address() / 4;
unsigned char* ptr = trans.get_data_ptr();
unsigned int len = trans.get_data_length();
unsigned char* byt = trans.get_byte_enable_ptr();
unsigned int wid = trans.get_streaming_width();
// Obliged to check address range and check for unsupported features,
// i.e. byte enables, streaming, and bursts
// Can ignore extensions
// *********************************************
// Generate the appropriate error response
// *********************************************
if (adr >= sc_dt::uint64(SIZE)) {
trans.set_response_status( tlm::TLM_ADDRESS_ERROR_RESPONSE );
return;
}
if (byt != 0) {
trans.set_response_status( tlm::TLM_BYTE_ENABLE_ERROR_RESPONSE );
return;
}
if (len > 4 || wid < len) {
trans.set_response_status( tlm::TLM_BURST_ERROR_RESPONSE );
return;
}
// cout << "MEM: addr=" << adr << endl;
// cout << "MEM: data=" << mem[adr] << endl;
// Obliged to implement read and write commands
if ( cmd == tlm::TLM_READ_COMMAND )
memcpy(ptr, &mem[adr], len);
else if ( cmd == tlm::TLM_WRITE_COMMAND )
memcpy(&mem[adr], ptr, len);
// Illustrates that b_transport may block
wait(delay);
// Reset timing annotation after waiting
delay = SC_ZERO_TIME;
// *********************************************
// Set DMI hint to indicated that DMI is supported
// *********************************************
trans.set_dmi_allowed(true);
// Obliged to set response status to indicate successful completion
trans.set_response_status( tlm::TLM_OK_RESPONSE );
}
bool Memory::get_direct_mem_ptr(tlm::tlm_generic_payload& trans,
tlm::tlm_dmi& dmi_data)
{
// Permit read and write access
dmi_data.allow_read_write();
// Set other details of DMI region
dmi_data.set_dmi_ptr( reinterpret_cast<unsigned char*>( &mem[0] ) );
dmi_data.set_start_address( 0 );
dmi_data.set_end_address( SIZE*4-1 );
dmi_data.set_read_latency( LATENCY );
dmi_data.set_write_latency( LATENCY );
return true;
}
void Memory::invalidation_process()
{
// Invalidate DMI pointers periodically
for (int i = 0; i < 4; i++)
{
wait(LATENCY*8);
socket->invalidate_direct_mem_ptr(0, SIZE-1);
}
}
unsigned int Memory::transport_dbg(tlm::tlm_generic_payload& trans)
{
tlm::tlm_command cmd = trans.get_command();
sc_dt::uint64 adr = trans.get_address() / 4;
unsigned char* ptr = trans.get_data_ptr();
unsigned int len = trans.get_data_length();
// Calculate the number of bytes to be actually copied
unsigned int num_bytes = (len < (SIZE - adr) * 4) ? len : (SIZE - adr) * 4;
if ( cmd == tlm::TLM_READ_COMMAND )
memcpy(ptr, &mem[adr], num_bytes);
else if ( cmd == tlm::TLM_WRITE_COMMAND )
memcpy(&mem[adr], ptr, num_bytes);
return num_bytes;
}
void Memory::readCustomHexFile(string filename) {
ifstream hexfile;
string line;
int i = 0;
hexfile.open(filename);
if (hexfile.is_open()) {
while(getline(hexfile, line) ) {
/* # is a comentary in the file */
if (line[0] != '#') {
cout << "i: " << i << endl;
mem[i] = stol(line.substr(0,8), nullptr, 16);
i++;
}
}
hexfile.close();
} else {
SC_REPORT_ERROR("Memory", "Open file error");
}
}
void Memory::readHexFile(string filename) {
ifstream hexfile;
string line;
int byte_count;
int address;
int i = 0;
hexfile.open(filename);
if (hexfile.is_open()) {
while(getline(hexfile, line) ) {
/* # is a comentary in the file */
if (line[0] == ':') {
if (line.substr(7,2) == "00")
{
/* Data */
byte_count = stol(line.substr(1,2), nullptr, 16);
address = stol(line.substr(3,4), nullptr, 16) / 4;
for (i=0; i < byte_count/4; i++) {
mem[address+i] = stol(line.substr(9+(i*8), 2), nullptr, 16);
mem[address+i] |= stol(line.substr(11+(i*8),2), nullptr, 16) << 8;
mem[address+i] |= stol(line.substr(13+(i*8),2), nullptr, 16) << 16;
mem[address+i] |= stol(line.substr(15+(i*8),2), nullptr, 16) << 24;
}
}
}
}
hexfile.close();
} else {
SC_REPORT_ERROR("Memory", "Open file error");
}
}