// since this operation is carried out writing sa value as unsigned value, it is necessary
// the overriding of ID method
public void ID() throws RAWException, IrregularWriteOperationException {
// if the source register is valid passing his own value into a temporary register
Register rt = cpu.getRegister(params.get(RT_FIELD));
if (rt.getWriteSemaphore() > 0) throw new RAWException();
TR[RT_FIELD] = rt;
// writing on a temporary register the sa field as unsigned value
TR[SA_FIELD].writeDoubleWord(params.get(SA_FIELD));
// increment the semaphore of the destination register
Register rd = cpu.getRegister(params.get(RD_FIELD));
rd.incrWriteSemaphore();
}
public void ID()
throws RAWException, IrregularWriteOperationException, IrregularStringOfBitsException {
// if source registers are valid passing their own values into temporary registers
Register rs = cpu.getRegister(params.get(RS_FIELD));
Register rt = cpu.getRegister(params.get(RT_FIELD));
if (rs.getWriteSemaphore() > 0 || rt.getWriteSemaphore() > 0) throw new RAWException();
TR[RS_FIELD] = rs;
TR[RT_FIELD] = rt;
// locking the destination register
cpu.getLO().incrWriteSemaphore();
cpu.getHI().incrWriteSemaphore();
}
public void doWB() throws IrregularStringOfBitsException {
// passing results from temporary registers to destination registers and unlocking them
Register lo = cpu.getLO();
Register hi = cpu.getHI();
lo.setBits(this.lo, 0);
hi.setBits(this.hi, 0);
lo.decrWriteSemaphore();
hi.decrWriteSemaphore();
}
