107 lines
3.4 KiB
Java
107 lines
3.4 KiB
Java
package processor.pipeline;
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import java.util.Arrays;
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import generic.Instruction;
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import processor.Processor;
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import generic.Instruction.OperationType;
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import generic.Operand;
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public class OperandFetch {
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Processor containingProcessor;
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IF_OF_LatchType IF_OF_Latch;
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OF_EX_LatchType OF_EX_Latch;
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static OperationType[] opTypes = OperationType.values();
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public OperandFetch(Processor containingProcessor, IF_OF_LatchType iF_OF_Latch, OF_EX_LatchType oF_EX_Latch)
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{
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this.containingProcessor = containingProcessor;
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this.IF_OF_Latch = iF_OF_Latch;
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this.OF_EX_Latch = oF_EX_Latch;
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}
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public void performOF()
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{
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if(IF_OF_Latch.isOF_enable())
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{
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int instruction = IF_OF_Latch.getInstruction();
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Instruction instr = new Instruction();
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String bin_instr = Integer.toBinaryString(instruction);
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int opcode = Integer.parseInt(bin_instr.substring(0, 5), 2);
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instr.setOperationType(opTypes[opcode]);
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int R3_type_operators[] = {0,2,4,6,8,10,12,14,16,18,20};
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int R2I_type_operators[] = {1,3,5,7,9,11,13,15,17,19,21,22,23,25,26,27,28};
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int R1I_type_operators[] = {24,29};
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// if (bin_instr.length() < 32) { // TODO: check if this is correct
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// int diff = 32 - bin_instr.length();
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// String zeros = "";
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// for (int i = 0; i < diff; i++) {
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// zeros += "0";
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// }
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// bin_instr = zeros + bin_instr;
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// }
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if (Arrays.asList(R3_type_operators).contains(opcode)){
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Operand rs1 = new Operand();
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Operand rs2 = new Operand();
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Operand rd = new Operand();
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rs1.setOperandType(Operand.OperandType.Register);
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rs2.setOperandType(Operand.OperandType.Register);
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rd.setOperandType(Operand.OperandType.Register);
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rs1.setValue(Integer.parseInt(bin_instr.substring(5, 10), 2));
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rs2.setValue(Integer.parseInt(bin_instr.substring(9, 14), 2));
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rd.setValue(Integer.parseInt(bin_instr.substring(14, 19), 2));
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int op1 = containingProcessor.getRegisterFile().getValue(rs1.getValue());
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int op2 = containingProcessor.getRegisterFile().getValue(rs2.getValue());
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OF_EX_Latch.setInstruction(instr);
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OF_EX_Latch.setOp1(op1);
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OF_EX_Latch.setOp2(op2);
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instr.setDestinationOperand(rd);
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instr.setSourceOperand1(rs1);
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instr.setSourceOperand2(rs2);
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}
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else if (Arrays.asList(R2I_type_operators).contains(opcode)){
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Operand rs1 = new Operand();
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Operand rd = new Operand();
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rs1.setOperandType(Operand.OperandType.Register);
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rd.setOperandType(Operand.OperandType.Register);
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rs1.setValue(Integer.parseInt(bin_instr.substring(5, 10), 2));
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rd.setValue(Integer.parseInt(bin_instr.substring(14, 19), 2));
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int imm = Integer.parseInt(bin_instr.substring(19, 32), 2); // TODO: 2's complement
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int op1 = containingProcessor.getRegisterFile().getValue(rs1.getValue());
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OF_EX_Latch.setInstruction(instr);
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OF_EX_Latch.setImm(imm);
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OF_EX_Latch.setOp1(op1);
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instr.setDestinationOperand(rd);
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instr.setSourceOperand1(rs1);
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}
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else if (Arrays.asList(R1I_type_operators).contains(opcode)){
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Operand rd = new Operand();
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rd.setOperandType(Operand.OperandType.Register);
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rd.setValue(Integer.parseInt(bin_instr.substring(5, 10), 2));
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instr.setDestinationOperand(rd);
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int imm = Integer.parseInt(bin_instr.substring(10, 32), 2); // TODO: 2's complement
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OF_EX_Latch.setInstruction(instr);
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OF_EX_Latch.setImm(imm);
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}
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IF_OF_Latch.setOF_enable(false);
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OF_EX_Latch.setEX_enable(true);
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}
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}
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}
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