pipes.h

#include <stdbool.h>
#include "consts.h"

#ifndef PIPES_H
#define PIPES_H

// Pipeline register structures

struct preg_if_id {
    uint32_t inst;          // Instruction value
    uint32_t next_pc;       // Following program counter
};

struct preg_id_exe {
    bool mem_read;          // Control : Memory read
    bool mem_write;         // Control : Memory writeback
    bool reg_write;         // Control : Register writeback
    bool alu_src;           // Control : Alu source (true = imm)
    bool mem_to_reg;        // Control : Write memory output to register

    uint32_t rt;            // RT
    uint32_t rs;            // Source register
    uint32_t funct;         // Funct value
    uint32_t rs_value;      // Value in rs register
    uint32_t rt_value;      // Value in rt register
    uint32_t sign_ext_imm;  // Sign extended immediate
    uint32_t reg_dst;       // Destination register
    uint32_t shamt;         // Shift amount
};

struct preg_exe_mem
{
    bool mem_read;          // Control : Memory read
    bool mem_write;         // Control : Memory writeback
    bool reg_write;         // Control : Register writeback
    bool mem_to_reg;        // Control : Write memory output to register

    uint32_t rt;            // RT
    uint32_t rt_value;      // Value in rt register
    uint32_t alu_res;       // Output of ALU
    uint32_t reg_dst;       // Destionation register
};

struct preg_mem_wb
{
    bool reg_write;         // Control : Register writeback
    bool mem_to_reg;        // Control : Write memory output to register

    uint32_t rt;            // RT
    uint32_t read_data;     // Data read from memory
    uint32_t alu_res;       // Output of ALU
    uint32_t reg_dst;       // Destionation register
};

// Pipeline steps

int interp_if();
int interp_id();
int interp_exe();
int interp_mem();
void interp_wb();

// Pipeline forwarding

int forward();

// Run MIPS cycle

int cycle();

#endif