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matthewdelorenzo
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systemc-code-database-new

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void risc16::fetch() {
while(true){
wait(execute_ev);
// Pega a instrucao e incrementa o PC
ri = mem[pc];
pc++;
// Se nao possui mais instrucoes
if(ri == 0){
cout << "Nao possui mais instrucoes!" << endl;
sc_stop();
exit(0);
}
fetch_ev.notify();
}
}
// Decodificacao de uma instrucao
void risc16::decode() {
while(true){
wait(fetch_ev);
// Preenchendo os campos de acordo com o RI
op = (ri >> 12) & 0xF;
regs = (ri >> 8) & 0xF;
regs2 = (ri >> 4) & 0xF;
regd = ri & 0xF;
const4 = (ri & 0x8)?(0xFFF0 | regd) : regd;
const8 = (char) (ri & 0xFF);
decode_ev.notify();
}
}
// Execucao de uma instrucao
void risc16::execute() {
while(true){
wait(decode_ev);
switch (op) {
//// Aritmeticas
// R
case i_ADD: breg[regd] = breg[regs] + breg[regs2];
break;
// R
case i_SUB: breg[regd] = breg[regs] - breg[regs2];
break;
// J
case i_ADDi: breg[regs] = breg[regs] + const8;
break;
// J
case i_SHIFT: if (const8 < 0)
breg[regs] = breg[regs] << (-const8);
else
breg[regs] = breg[regs] >> const8;
break;
//// Logicas
// R
case i_AND: breg[regd] = breg[regs] & breg[regs2];
break;
// R
case i_OR : breg[regd] = breg[regs] | breg[regs2];
break;
// R
case i_XOR: breg[regd] = breg[regs] ^ breg[regs2];
break;
// J
case i_NOT: breg[regs] = ~breg[regs];
break;
// R
case i_SLT: breg[regd] = breg[regs] < breg[regs2];
break;
//// Transferencia
// R
case i_LW: cout << "Mem:" << endl;
dump_mem(breg[regs]+breg[regs2],breg[regs]+breg[regs2],'H');
breg[regd] = mem[breg[regs] + breg[regs2]];
break;
// R
case i_SW: cout << "Mem antes:" << endl;
dump_mem(breg[regs]+breg[regs2],breg[regs]+breg[regs2],'H');
mem[breg[regs] + breg[regs2]] = breg[regd];
cout << "Mem depois:" << endl;
dump_mem(breg[regs]+breg[regs2],breg[regs]+breg[regs2],'H');
break;
// J
case i_LUI: breg[regs] = const8 << 8;
break;