inline void MOESI_protocol::do_snoop_M (Mreq *request)
{
switch (request->msg)
{
case GETS:
/** Someone needs the cache line to read which we have.
We should provide that data.
*/
set_shared_line();
send_DATA_on_bus(request->addr,request->src_mid);
state = MOESI_CACHE_O;
break;
case GETM:
/** Someone needs the cache line to read which we have.
We should provide that data.
*/
set_shared_line();
send_DATA_on_bus(request->addr,request->src_mid);
state = MOESI_CACHE_I;
break;
case DATA:
/** Someone else needed the cache line data which is available to that processer.
We should just ignore it.
*/
break;
default:
request->print_msg (my_table->moduleID, "ERROR");
fatal_error ("Client: I state shouldn't see this message\n");
}
}
inline void MSI_protocol::do_snoop_M (Mreq *request)
{
switch (request->msg) {
case GETS:
set_shared_line();
send_DATA_on_bus(request->addr,request->src_mid);
state = MSI_CACHE_S;
break;
case GETM:
/**
* Another cache wants the data so we send it to them and transition to
* Invalid since they will be transitioning to M. When we send the DATA
* it will go on the bus the next cycle and the memory will see it and cancel
* its lookup for the DATA.
*/
/**
* We use set_shared_line() here to demonstrate its use. Since we had a copy
* of the line being requested, we should indicate that the data is shared on
* chip. (This will be essential to understand in order to implement MESI/
* MOSI/MOESI)
*/
set_shared_line();
send_DATA_on_bus(request->addr,request->src_mid);
state = MSI_CACHE_I;
break;
case DATA:
fatal_error ("Should not see data for this line! I have the line!");
break;
default:
request->print_msg (my_table->moduleID, "ERROR");
fatal_error ("Client: M state shouldn't see this message\n");
}
}
inline void MOESI_protocol::do_snoop_OM (Mreq *request){
switch (request->msg){
case GETS:send_DATA_on_bus(request->addr,request->src_mid); //SEND DATA ON BUS SINCE I'M IN INTERMEDIATE STATE BETWEEN O AND M
break;
case GETM:send_DATA_on_bus(request->addr,request->src_mid); //SEND DATA ON BUS SINCE I'M IN INTERMEDIATE STATE BETWEEN O AND M AND INVALIDATE SELF
state = MOESI_CACHE_IM;
break;
case DATA:
break;
default:
request->print_msg (my_table->moduleID, "ERROR");
fatal_error ("Client: IM state shouldn't see this message\n");
}
}
inline void MOESI_protocol::do_snoop_SM (Mreq *request)
{
switch (request->msg)
{
case GETS:
set_shared_line();
if(-1!=Owner_nodeID)
{
//give data
send_DATA_on_bus(request->addr,request->src_mid);
}
break;
case GETM:
if( (-1!=Owner_nodeID) && (false==get_shared_line()) )
{
//give data
set_shared_line();
send_DATA_on_bus(request->addr,request->src_mid);
}
if (request->src_mid.nodeID != Owner_nodeID)
{
//Change state
state = MOESI_CACHE_IM;
Owner_nodeID = -1;
}
break;
case DATA:
Owner_nodeID = -1;
//Get data
send_DATA_to_proc(request->addr);
//Change to modify state
state = MOESI_CACHE_M;
break;
default:
request->print_msg (my_table->moduleID, "ERROR");
fatal_error ("Client: State shouldn't see this message\n");
}
}
inline void MOESI_protocol::do_snoop_OM_Intermediate (Mreq *request)
{
switch (request->msg) {
case GETS:
set_shared_line();
send_DATA_on_bus(request->addr,request->src_mid);
break;
case GETM:
send_DATA_on_bus(request->addr,request->src_mid);
state = MOESI_CACHE_IM_Intermediate;
break;
case DATA:
state = MOESI_CACHE_M;
break;
default:
request->print_msg (my_table->moduleID, "ERROR");
fatal_error ("Client: I state shouldn't see this message\n");
}
}
inline void MSI_protocol::do_snoop_M (Mreq *request){
switch (request->msg){
case GETS:
send_DATA_on_bus(request->addr,request->src_mid); //SUPPLY THE DATA
state = MSI_CACHE_S;
break;
case GETM:
send_DATA_on_bus(request->addr,request->src_mid); //SUPPLY THE DATA AND INVALIDATE SELF
state = MSI_CACHE_I;
break;
case DATA:
fatal_error ("Should not see data for this line! I have the line!");
break;
default: request->print_msg (my_table->moduleID, "ERROR");
fatal_error ("Client: M state shouldn't see this message\n");
}
}
inline void MOESI_protocol::do_snoop_O (Mreq *request)
{
switch (request->msg) {
case GETS:
set_shared_line();
send_DATA_on_bus(request->addr,request->src_mid);
break;
case GETM:
state = MOESI_CACHE_I;
set_shared_line();
send_DATA_on_bus(request->addr,request->src_mid);
break;
case DATA:
fatal_error ("Should not see data for this line! I have the line!");
break;
default:
request->print_msg (my_table->moduleID, "ERROR");
fatal_error ("Client: O state shouldn't see this message\n");
}
}
inline void MOESIF_protocol::do_snoop_FM (Mreq *request)
{
switch (request->msg) {
case GETS:
set_shared_line(); // Set shared line to prevent other nodes going to E
send_DATA_on_bus(request->addr,request->src_mid);
break;
case GETM:
set_shared_line(); // Set shared line to prevent other nodes going to E
send_DATA_on_bus(request->addr,request->src_mid);
break;
case DATA:
send_DATA_to_proc(request->addr);
state = MOESIF_CACHE_M;
break;
default:
request->print_msg (my_table->moduleID, "ERROR");
fatal_error ("Client: IM state shouldn't see this message\n");
}
}
inline void MESI_protocol::do_snoop_E (Mreq *request)
{
switch (request->msg) {
case GETS:
// Send the data, set the shared line and downgrade to S
send_DATA_on_bus(request->addr, request->src_mid);
set_shared_line(true);
state = MESI_CACHE_S;
break;
case GETM:
send_DATA_on_bus(request->addr, request->src_mid);
state = MESI_CACHE_I; // Go to the invalid state
break;
case DATA:
break;
default:
request->print_msg (my_table->moduleID, "ERROR");
fatal_error ("Client SnoopE state shouldn't see this message\n");
}
}
inline void MOESIF_protocol::do_snoop_F (Mreq *request)
{
switch (request->msg) {
case GETS:
/* In the F state, we can provide data to other nodes requesting the data
since we have a copy.
*/
set_shared_line();
send_DATA_on_bus(request->addr,request->src_mid);
break;
case GETM:
set_shared_line();
send_DATA_on_bus(request->addr,request->src_mid);
state = MOESIF_CACHE_I; /* Downgrade to I if other node requesting M */
break;
case DATA:
break;
default:
request->print_msg (my_table->moduleID, "ERROR");
fatal_error ("Client: S state shouldn't see this message\n");
}
}
inline void MSI_protocol::do_snoop_M (Mreq *request)
{
switch (request->msg) {
case GETS:
//since I have the most updated data, I should supply it!
set_shared_line();
send_DATA_on_bus(request->addr,request->src_mid);
state = MSI_CACHE_S;
break;
case GETM:
//since someone else is modifying the data, I should abort and invalidate myself
set_shared_line();
send_DATA_on_bus(request->addr,request->src_mid);
state = MSI_CACHE_I;
break;
case DATA: break;
default:
request->print_msg (my_table->moduleID, "ERROR");
fatal_error ("Client: I state shouldn't see this message\n");
}
}
inline void MOSI_protocol::do_snoop_OM (Mreq *request){
switch (request->msg) {
case GETS:
set_shared_line();
send_DATA_on_bus(request->addr,request->src_mid);
break;
case GETM:
state = MOSI_CACHE_IM;
set_shared_line();
send_DATA_on_bus(request->addr,request->src_mid);
Sim->cache_misses++;
break;
case DATA:
send_DATA_to_proc(request->addr);
state = MOSI_CACHE_M;
if (get_shared_line()){}
break;
default:
request->print_msg (my_table->moduleID, "ERROR");
fatal_error ("Client: OM state shouldn't see this message\n");
}
}
inline void MOESI_protocol::do_snoop_M (Mreq *request)
{
switch (request->msg){
case GETS:
send_DATA_on_bus(request->addr,request->src_mid); //SUPPLY THE DATA SINCE I HAVE THE UPDATED VERSION
state = MOESI_CACHE_O; //I SUPPLY THE DIRTY DATA TO EVERYONE
set_shared_line();
break;
case GETM:
send_DATA_on_bus(request->addr,request->src_mid); //SUPPLY DATA
state = MOESI_CACHE_I; //INVALIDATE
set_shared_line();
break;
case DATA:
fatal_error ("Should not see data for this line! I have the line!");
break;
default: request->print_msg (my_table->moduleID, "ERROR");
fatal_error ("Client: M state shouldn't see this message\n");
}
}
inline void MESI_protocol::do_snoop_M (Mreq *request)
{
switch (request->msg) {
case GETS:
// Send the data and go to S
send_DATA_on_bus(request->addr, request->src_mid);
set_shared_line(true);
state = MESI_CACHE_S;
break;
case GETM:
// Send the data and go to I
send_DATA_on_bus(request->addr, request->src_mid);
state = MESI_CACHE_I;
break;
case DATA:
request->print_msg (my_table->moduleID, "ERROR");
fatal_error("SnoopM should not see data for this line! I have the line!\n");
break;
default:
request->print_msg (my_table->moduleID, "ERROR");
fatal_error ("Client SnoopM state shouldn't see this message\n");
}
}
inline void TYPE(_protocol)::do_snoop_M (Mreq *request)
{
switch (request->msg) {
/*
See cache function
with same state for
description of this state
*/
case GETM:// See E state
state = TYPE(_CACHE_I);
set_shared_line();
send_DATA_on_bus(request->addr,request->src_mid);
break;
case GETS:
state = TYPE(_CACHE_S);
set_shared_line();
send_DATA_on_bus(request->addr,request->src_mid);
break;
case DATA:
default:
request->print_msg (my_table->moduleID, "ERROR");
fatal_error ("Client: M state shouldn't see this message\n");
}
}
inline void TYPE(_protocol)::do_snoop_FM (Mreq *request)
{
switch (request->msg) {
/*
See cache function
with same state for
description of this state
*/
case GETM: // if someone writes to the dataz, then invalidate
state = TYPE(_CACHE_IM);
case GETS://technically in F , so give the dataz to the other guy
send_DATA_on_bus(request->addr,request->src_mid);
set_shared_line();
break;
case DATA: // can haz dataz
send_DATA_to_proc(request->addr);
state = TYPE(_CACHE_M);
break;
default:
request->print_msg (my_table->moduleID, "ERROR");
fatal_error ("Client: FM state shouldn't see this message\n");
}
}