sim.h

#ifndef __SIM_H__
#define __SIM_H__

#include "pagetable.h"
#define MAXLINE 256
#define SIMPAGESIZE 16  /* Simulated physical memory page frame size */

extern unsigned memsize;
extern int debug;

extern int hit_count;
extern int miss_count;
extern int ref_count;
extern int evict_clean_count;
extern int evict_dirty_count;

/* We simulate physical memory with a large array of bytes */
extern char *physmem;

/* The tracefile name is a global variable because the OPT
 * algorithm will need to read the file before you start
 * replaying the trace.
 */
extern char *tracefile;

// Each eviction algorithm is represented by a structure with its name
// and three functions.
struct functions {
	char *name;                  // String name of eviction algorithm
	void (*init)(void);          // Initialize any data needed by alg
	void (*ref)(pgtbl_entry_t *);    // Called on each reference
	int (*evict)();              // Called to choose victim for eviction
};

extern void (*init_fcn)();
extern void (*ref_fcn)(pgtbl_entry_t *);
extern int (*evict_fcn)();

#endif // __SIM_H