utilities.h

#ifndef UTILITIES_H
#define UTILITIES_H

#include "systemc"
using namespace sc_core;
using namespace sc_dt;
using namespace std;

#include "tlm.h"

// **************************************************************************************
// User-defined memory manager, which maintains a pool of transactions
// **************************************************************************************

class mm: public tlm::tlm_mm_interface
{
    typedef tlm::tlm_generic_payload gp_t;

public:
    mm() : free_list(0), empties(0) {}

    gp_t* allocate();
    void  free(gp_t* trans);

private:
    struct access
    {
        gp_t* trans;
        access* next;
        access* prev;
    };

    access* free_list;
    access* empties;

};

mm::gp_t* mm::allocate()
{
    gp_t* ptr;
    if (free_list)
    {
        ptr = free_list->trans;
        empties = free_list;
        free_list = free_list->next;
    }
    else
    {
        ptr = new gp_t(this);
    }
    return ptr;
}

void mm::free(gp_t* trans)
{
    if (!empties)
    {
        empties = new access;
        empties->next = free_list;
        empties->prev = 0;
        if (free_list)
            free_list->prev = empties;
    }
    free_list = empties;
    free_list->trans = trans;
    empties = free_list->prev;
}

#endif